Caution: Federal law (U.S.) restricts this device to sale by or on the order of a physician.To contact Mallinckrodt's representative: In the United States, call 1-800-635-5267 or 314-654-2000; outside the United States,call your local Mallinckrodt representative.
© 2000 Mallinckrodt Inc. All rights reserved. 035154D-0100
SERVICE MANUAL
NPB-195 Pulse Oximeter
Mallinckrodt Inc.675 McDonnell BoulevardP.O. Box 5840St. Louis, MO 63134 USATel 314.654.2000Toll Free 1.800.635.5267
MallinckrodtEurope BVHambakenwetering 15231 DD's-HertogenboschThe NetherlandsTel +31.73.6485200
Nellcor Puritan Bennett Inc.4280 Hacienda DrivePleasanton, CA 94588 USA
Nellcor Puritan Bennett Inc. is a wholly owned subsidiary of Mallinckrodt Inc. Nellcor,Nellcor Puritan Bennett, Durasensor, and Oxisensor II are trademarks of Mallinckrodt Inc.
To obtain information about a warranty, if any, for this product, contact Mallinckrodt'sTechnical Services or your local Mallinckrodt representative.
Purchase of this instrument confers no express or implied license under any Mallinckrodtpatent to use the instrument with any sensor that is not manufactured or licensed byMallinckrodt.
Covered by one or more of the following U.S. Patents and foreign equivalents: 4,621,643;4,653,498; 4,700,708; 4,770,179; 4,869,254; 5,078,136; 5,351,685; and 5,368,026.
iii
TABLE OF CONTENTSList of FiguresList of Tables
Table of Contents ........................................................................................ iiiList of Figures........................................................................................... vList of Tables ............................................................................................ vi
Section 1: Introduction .............................................................................. 1-11.1 Manual Overview.......................................................................... 1-11.2 NPB-195 Pulse Oximeter Description.......................................... 1-11.3 Power-On Self Test...................................................................... 1-41.4 Related Documents...................................................................... 1-4
Section 2: Routine Maintenance............................................................... 2-12.1 Cleaning ....................................................................................... 2-12.2 Periodic Safety and Functional Checks ....................................... 2-12.3 Battery.......................................................................................... 2-1
Section 3: Performance Verification......................................................... 3-13.1 Introduction .................................................................................. 3-13.2 Equipment Needed ...................................................................... 3-13.3 Performance Tests....................................................................... 3-13.4 Safety Tests ................................................................................. 3-9
Section 4: Power-On Settings and Service Functions ........................... 4-14.1 Introduction .................................................................................. 4-14.2 Power-On Settings ....................................................................... 4-14.3 Service Functions......................................................................... 4-2
Section 5: Troubleshooting....................................................................... 5-15.1 Introduction .................................................................................. 5-15.2 How to Use this Section ............................................................... 5-15.3 Who Should Perform Repairs ...................................................... 5-15.4 Replacement Level Supported..................................................... 5-15.5 Obtaining Replacement Parts ...................................................... 5-15.6 Troubleshooting Guide................................................................. 5-25.7 Error Codes.................................................................................. 5-7
Section 6: Disassembly Guide .................................................................. 6-16.1 Introduction .................................................................................. 6-16.2 Prior to Disassembly .................................................................... 6-16.3 Fuse Replacement ....................................................................... 6-26.4 Monitor Disassembly.................................................................... 6-36.5 Monitor Reassembly .................................................................... 6-46.6 Battery Replacement.................................................................... 6-56.7 Power Entry Module (PEM) Removal/Installation ........................ 6-76.8 Power Supply Removal/Installation.............................................. 6-86.9 Cooling Fan Removal/Installation ................................................ 6-96.10 Display PCB Removal/Installation................................................ 6-106.11 UIF PCB Removal/Installation...................................................... 6-116.12 Alarm Speaker Removal/Installation............................................ 6-13
Section 7: Spare Parts ............................................................................... 7-17.1 Introduction .................................................................................. 7-1
Section 8: Packing for Shipment .............................................................. 8-18.1 General Instructions ..................................................................... 8-18.2 Repacking in Original Carton ....................................................... 8-28.3 Repacking in a Different Carton................................................... 8-3
Table of Contents
iv
Section 9: Specifications........................................................................... 9-19.1 General ........................................................................................ 9-19.2 Electrical....................................................................................... 9-19.3 Physical Characteristics ............................................................... 9-29.4 Environmental .............................................................................. 9-29.5 Alarms .......................................................................................... 9-29.6 Factory Default Settings............................................................... 9-39.7 Performance ................................................................................ 9-3
Section 10: Serial Port Interface Protocol................................................ 10-110.1 Introduction .................................................................................. 10-110.2 Enabling the Serial Port................................................................ 10-110.3 Connecting to the Serial Port ....................................................... 10-110.4 Real-Time Printout ....................................................................... 10-210.5 Trend Data Printout...................................................................... 10-510.6 Nurse Call .................................................................................... 10-5
Section 11: Technical Supplement ........................................................... 11-111.1 Introduction .................................................................................. 11-111.2 Oximetry Overview....................................................................... 11-111.3 Circuit Analysis............................................................................. 11-211.4 Functional Overview..................................................................... 11-211.5 AC Input ....................................................................................... 11-311.6 Power Supply PCB Theory of Operation...................................... 11-311.7 Battery.......................................................................................... 11-411.8 User Interface PCB (UIF)............................................................. 11-511.9 Front Panel Display PCB and Controls ........................................ 11-811.10 Schematic Diagrams.................................................................... 11-8
Section 12: Index........................................................................................ 12-1
Table of Contents
v
LIST OF FIGURESFigure 1-1: NPB-195 Front Panel .................................................................. 1-2Figure 1-2: User Softkey Map........................................................................ 1-3Figure 1-3: NPB-195 Rear Panel................................................................... 1-4Figure 3-1: NPB-195 Controls ....................................................................... 3-2Figure 3-2: Self-Test Display......................................................................... 3-3Figure 3-3: Adjusting %SpO2 Upper Alarm Limit .......................................... 3-3Figure 3-4: Adjusting % SpO2 Lower Alarm Limit ......................................... 3-4Figure 3-5: Adjusting High Pulse Rate Alarm................................................ 3-4Figure 3-6: Adjusting Low Pulse Rate Alarm................................................. 3-4Figure 4-1: Service Function Softkeys........................................................... 4-2Figure 4-2: Service Function Softkey Map .................................................... 4-3Figure 4-3: Param Softkeys.......................................................................... 4-4Figure 4-4: Print Softkeys .............................................................................. 4-4Figure 4-5: Trend Printout ............................................................................. 4-5Figure 4-6: Errlog Printout ............................................................................. 4-6Figure 4-7: Instat Printout .............................................................................. 4-6Figure 4-8: Next Softkeys .............................................................................. 4-7Figure 4-9: Alarms Softkeys .......................................................................... 4-7Figure 6-1: Fuse Removal ............................................................................. 6-2Figure 6-2: NPB-195 Corner Screws............................................................. 6-3Figure 6-3: Separating Case Halves ............................................................. 6-4Figure 6-4: NPB-195 Battery ......................................................................... 6-5Figure 6-5: Internal Power Connections ........................................................ 6-6Figure 6-6: Power Entry Module ................................................................... 6-7Figure 6-7: Power Supply .............................................................................. 6-8Figure 6-8: Cooling Fan................................................................................. 6-9Figure 6-9: Display PCB ................................................................................ 6-10Figure 6-10: UIF PCB.................................................................................... 6-12Figure 6-11: Alarm Speaker .......................................................................... 6-13Figure 7-1: NPB-195 Expanded View............................................................ 7-2Figure 8-1: Repacking the NPB-195.............................................................. 8-2Figure 10-1: Serial Port Pin Layout................................................................ 10-2Figure 10-2: Real-Time Printout ................................................................... 10-2Figure 10-3: Trend Data Printout.................................................................. 10-5Figure 11-1: Oxyhemoglobin Dissociation Curve ......................................... 11-2Figure 11-2: NPB-195 Functional Block Diagram ......................................... 11-3Figure 11-3: UIF PCB Front End Red/IR Schematic Diagram ..................... 11-8Figure 11-4: Front End LED Drive Schematic Diagram ............................... 11-8Figure 11-5: Front End Output Schematic Diagram ..................................... 11-8Figure 11-6: Front End Power Supply Schematic Diagram.......................... 11-8Figure 11-7: Isolation Barrier EIA-232 Port Schematic Diagram.................. 11-8Figure 11-8: CPU Core Schematic Diagram A............................................. 11-9Figure 11-9: CPU Core Schematic Diagram B............................................. 11-9Figure 11-10: MC331 CPU Core Schematic Diagram A .............................. 11-9Figure 11-11: MC331 CPU Core Schematic Diagram B .............................. 11-9Figure 11-12: Display Driver Schematic Diagram ........................................ 11-9Figure 11-13: Speaker Driver Schematic Diagram....................................... 11-9Figure 11-14: Core Power Supply Schematic Diagram................................ 11-9Figure 11-15: Power On/Off Circuit Schematic Diagram ............................. 11-9Figure 11-16: UIF PCB Parts Locator Diagram............................................ 11-9Figure 11-17: Power Supply Schematic Diagram......................................... 11-9Figure 11-18: Power Supply Parts Locator Diagram .................................... 11-9
Table of Contents
vi
LIST OF TABLESTable 3-1: Dynamic Operating Range.......................................................... 3-7Table 3-2: Earth Leakage Current Limits ..................................................... 3-10Table 3-3: Enclosure Leakage Current Limits .............................................. 3-11Table 3-4: Patient Leakage Current Limits................................................... 3-11Table 3-5: Patient Leakage Current Test Configurations -
Mains Voltage on the Applied Part............................................. 3-12Table 4-1: Factory Default Settings .............................................................. 4-2Table 5-1: Problem Categories .................................................................... 5-2Table 5-2: Power Problems.......................................................................... 5-3Table 5-3: Button Problems.......................................................................... 5-4Table 5-4: Display/Alarms Problems ............................................................ 5-4Table 5-5: Operational Performance Problems............................................ 5-5Table 5-6: Serial Port Problems ................................................................... 5-6Table 5-7: Error Codes................................................................................. 5-7Table 7-1: Parts List ..................................................................................... 7-1Table 9-1: Default Settings ........................................................................... 9-3Table 10-1: Serial Port Pin-Outs................................................................... 10-1Table 10-2: Status Codes............................................................................. 10-4
1-1
SECTION 1: INTRODUCTION1.1 Manual Overview1.2 NPB-195 Pulse Oximeter Description1.3 Power-On Self Test1.4 Related Documents
1.1 MANUAL OVERVIEW
This manual contains information for servicing the Nellcor model NPB-195pulse oximeter. Only qualified service personnel should service this product.Before servicing the NPB-195, read the operator’s manual carefully for athorough understanding of operation.
WARNING: Explosion hazard. Do not use the NPB-195 pulse oximeter inthe presence of flammable anesthetics.
1.2 NPB-195 PULSE OXIMETER DESCRIPTION
The NPB-195 is a portable pulse oximeter intended for use as a continuousnoninvasive monitor of arterial oxygen saturation (SpO2) and pulse rate. It canbe used on adult, pediatric and neonatal patients. Oxygen saturation and pulserate are displayed digitally along with a plethysmographic waveform or a ten-segment blip bar which indicates pulse intensity.
Through the use of the four softkeys, the operator can access trend information,select an alarm limit to be changed, choose the language to be used, adjust theinternal time clock, and change communications protocol. The NPB-195 canoperate on AC power or on an internal battery. This monitor is intended for usein hospital, hospital-type facilities, during intra-hospital transport, and in homeenvironments. The controls and indicators for the NPB-195 are illustrated inFigure 1-1 through Figure 1-3.
Figure 1-2 illustrates the various functions available, and how to access them,through the use of the softkeys. A complete explanation of the keys is providedin the NPB-195 operator’s manual.
Section 1: Introduction
1-2
NPB-195
%SP02
BPM
100110
LIGHTLIMITS TREND SETUP
1 2 3 4 5 6 7 9
1011121415 13
8
16
1. SpO2 Sensor Port 9. Alarm Silence Button2. Low Battery Indicator 10. Adjust Up Button3. Power On/Standby Button 11. Adjust Down Button4. AC/Battery Charging Indicator 12. Contrast Button5. Waveform Display 13. Softkeys6. %SpO2 Indicator 14. Menu Bar7. Pulse Beats Per Minute display 15. Pulse Search Indicator8. Alarm Silence Indicator 16. Speaker
Figure 1-1: NPB-195 Front Panel
Section 1: Introduction
1-3
NormalDisplay Mode
Limits Trend Light
Sel Exit View Clock
Setup
ExitNext
ExitBlipPleth
Return to Display Mode
LCD Display LightON/OFF
View Zoom Next
Dual SpO2 Pulse Hist
Return to Display Mode
Trend forSpO2 andPulse
SpO2 trendonly
Pulse trendonly
Histogram forSpO2 andPulse
Selects trend datafrom last 24, 12, 8, 4,2 or 1 hours 30min or15min
Exit
Clear Print
Yes No
Next
Clears alltrend info
Returns to prior trenddisplay
Print out of screen
Returns todisplaymode
Cycles between(Clear, Print, Exit,Next) screen and(View, Zoom,Exit, Next) screen
Exit
Select alarmlimit to be adjustedHigh/Low%SpO2 or Pulse
Comm Lang ExitNextSelect 24009600 or 19200
EnglishFrancaisDeutschItalianoEspanolDutchPortug
Return to Display
Return to Display Mode
ExitSel
ExitSet
Mode
9565BPM
%SPO2
Figure 1-2: User Softkey Map
Section 1: Introduction
1-4
2
4
1 3
5
NPB-195
0123IPX1
R
NRTL/C
TM
T 0.50A 250V
2X
NELLCOR PURITAN BENNETT EUROPE BV,'s-HERTOGENBOSCH, THE NETHERLANDS
NELLCOR PURITAN BENNETT, INC.PLEASANTON, CA 94588, U.S.A.
MADE IN IRELAND
SN
100-120 V 200-240 V 50/60 Hz 20VA
U.S. PATENTS: 4,621,643; 4,653,498; 4,700,708; 4,770,179; 4,869,254; Re. 35,122; 4,928,692; 4,934,372; 5,078,136
CISPR 11Group 1Class B
1. Equipotential (ground) Terminal 4. Fuse Receptacle2. AC Inlet 5. Voltage Selection Switch3. DB-15 Interface Connector
Figure 1-3: NPB-195 Rear Panel
1.3 POWER-ON SELF TEST
When the NPB-195 is turned on it will perform a POST (Power-On Self Test).During POST the following sequence should occur:
• All indicator lights illuminate
• All pixels in the LCD display illuminate
• The backlight turns on and the Nellcor Puritan Bennett logo and softwareversion are displayed
Upon successful completion of POST, the NPB-195 sounds a 1-second toneindicating that the monitor has passed the test.
If the start-up sequence is not completed as described above, do not use themonitor.
The software version is often needed when calling Mallinckrodt's TechnicalServices Department or your local Mallinckrodt representative for technicalassistance. Record the software version and have it available prior to requestingtechnical assistance.
1.4 RELATED DOCUMENTS
To perform test and troubleshooting procedures, and to understand the principlesof operation and circuit analysis sections of this manual, you must know how tooperate the monitor. Refer to the NPB-195 operator’s manual. To understandthe various Nellcor sensors that work with the monitor, refer to the individualsensor’s directions for use.
2-1
SECTION 2: ROUTINE MAINTENANCE2.1 Cleaning2.2 Periodic Safety and Functional Checks2.3 Battery
2.1 CLEANING
Caution: Do not immerse the NPB-195 or its accessories in liquid or cleanwith caustic or abrasive cleaners. Do not spray or pour any liquid on themonitor or its accessories.
To clean the NPB-195, dampen a cloth with a commercial, nonabrasive cleanerand wipe the exterior surfaces lightly. Do not allow any liquids to come incontact with the power connector, fuse holder, or switches. Do not allow anyliquids to penetrate connectors or openings in the instrument cover. Wipe sensorcables with a damp cloth. For sensors, follow each sensor’s directions for use.
2.2 PERIODIC SAFETY AND FUNCTIONAL CHECKS
The following checks should be performed at least every 2 years by a qualifiedservice technician.
1. Inspect the exterior of the NPB-195 for damage.
2. Inspect safety labels for legibility. If the labels are not legible, contactMallinckrodt's Technical Services Department or your Mallinckrodtrepresentative.
3. Verify that the unit performs properly as described in paragraph 3.3.
4. Perform the electrical safety tests detailed in paragraph 3.4. If the unit failsthese electrical safety tests, do not attempt to repair the NPB-195. ContactMallinckrodt's Technical Services Department or your local Mallinckrodtrepresentative.
5. Inspect the fuses for proper value and rating (F1 & F2 = 0.5 amp slowblow).
2.3 BATTERY
Mallinckrodt recommends replacing the instrument battery every 2 years. Whenthe NPB-195 is going to be stored for 3 months or more, remove the battery priorto storage. To replace or remove the battery, refer to Section 6, DisassemblyGuide.
If the NPB-195 has been stored for more than 30 days, charge the battery asdescribed in paragraph 3.3.1. A fully discharged battery requires 14 hours instandby, or 18 hours if in use, to receive a full charge. The battery is beingcharged anytime the instrument is plugged into AC.
3-1
SECTION 3: PERFORMANCE VERIFICATION3.1 Introduction3.2 Equipment Needed3.3 Performance Tests3.4 Safety Tests
3.1 INTRODUCTION
This section discusses the tests used to verify performance following repairs orduring routine maintenance. All tests can be performed without removing theNPB-195 cover. All tests except the battery charge and battery performancetests must be performed as the last operation before the monitor is returned to theuser.
If the NPB-195 fails to perform as specified in any test, repairs must be made tocorrect the problem before the monitor is returned to the user.
3.2 EQUIPMENT NEEDED
Equipment DescriptionDigital multimeter (DMM) Fluke Model 87 or equivalent
Durasensor® oxygen transducer DS-100A
Oxisensor® II oxygen transducer D-25
Pulse oximeter tester SRC-2Safety analyzer Must meet current AAMI ES1/1993 &
IEC 601-1/1998 specificationsSensor extension cable EC-4 or EC-8Serial interface cable EIA-232 cable (optional)Stopwatch Manual or electronic
3.3 PERFORMANCE TESTS
The battery charge procedure should be performed before monitor repairswhenever possible. It should also be performed before returning the instrumentto use.
Note: This section is written using Mallinckrodt factory-set defaults. If yourinstitution has preconfigured custom defaults, those values will bedisplayed. Factory defaults can be restored using the configurationmode procedure described in paragraph 4.2.1 below.
Section 3: Performance Verification
3-2
3.3.1 Battery Charge
Perform the following procedure to fully charge the battery.
1. Connect the monitor to an AC power source.
2. Verify that the monitor is off and that the AC Power/Battery Chargingindicator is lit.
3. Charge the battery for at least 14 hours in standby.
3.3.2 Power-up Performance
The power-up performance tests (3.3.3.1 through 3.3.3.3) verify the followingmonitor functions:
• 3.3.2.1 Power-On Self-Test
• 3.3.2.2 Power-On Defaults and Alarm Limit Ranges
NPB-195
%SP02
BPM
100110
LIGHTLIMITS TREND SETUP
Power On/Standby Alarm silence
AdjustUp
AdjustDown
Soft keys Contrast
Figure 3-1: NPB-195 Controls
3.3.2.1 Power-On Self-Test
1. Connect the monitor to an AC power source and verify that the ACPower/Battery Charging indicator is lit.
2. Do not connect any input cables to the monitor.
Section 3: Performance Verification
3-3
3. Observe the monitor front panel. With the monitor off, press the PowerOn/Standby button. See Figure 3-1. The monitor must perform thefollowing sequence.
a. Within 2 seconds all LEDs are illuminated, then all pixels on the LCDdisplay are illuminated, after which, the backlight comes on.
b. The indicators remain lighted.
c. The LCD display shows the Nellcor Puritan Bennett logo and thesoftware version of the NPB-195 (Figure 3-2).
NPB-195
NellcorPuritanBennett
NPB-195 Version 1.1.0.5
Figure 3-2: Self-Test Display
d. A 1-second beep sounds indicating proper operation of the speaker, andall indicators turn off except the AC Power/Battery Chargingindicators.
e. The NPB-195 begins normal operation.
3.3.2.2 Power-On Defaults and Alarm Limit Ranges
Note: When observing or changing default limits, a 10-second timeout is ineffect. If no action is taken within 10 seconds, the monitorautomatically returns to the monitoring display.
Note: The descriptions that follow are based on the assumption that Pleth isthe view that has been selected. The steps to changing an alarm limitare the same if the view being used is Blip.
1. Ensure that the monitor is on. Press and release the Limits softkey. Verifythat the monitor emits a single beep and the plethysmograph waveform isreplaced with a display of the alarm limits. The high alarm limit for %SpO2will indicate an alarm limit of “100” inside a box (Figure 3-3).
NPB-195
EXITSEL
%SP02
BPM
100110
ALARM LIMITS
UPPERLOWER
SPO2 PULSE
8517040
100
Figure 3-3: Adjusting %SpO2 Upper Alarm Limit
At the end of 10 seconds, with no activity, normal monitoring is resumed.
Section 3: Performance Verification
3-4
2. Press the Limits softkey. Press and hold the Down Arrow button. Verifythat the boxed number for %SpO2 upper alarm limit reduces to a minimumof “85.”
Note: A decimal point in the display indicates that the alarm limits havebeen changed from factory default values.
3. Press the SEL softkey. Verify that the monitor emits a single beep and thebox moves to the %SpO2 lower alarm limit of “85.” See Figure 3-4.
NPB-195
EXITSEL
%SP02
BPM
100110
ALARM LIMITS
UPPERLOWER
SPO2 PULSE
8517040
100
Figure 3-4: Adjusting % SpO2 Lower Alarm Limit
4. Press and hold the Down Arrow button and verify that the %SpO2 loweralarm limit display reduces to a minimum of “20.” Press and hold the UpArrow button and verify that the %SpO2 lower alarm limit display cannot beraised past the upper alarm limit setting of “85.” Press the Exit button.
5. Press the Limits softkey and then press the SEL softkey two times. Verifythat the monitor emits a beep after each keystroke. The Pulse upper alarmlimit should be “170” and should be boxed. See Figure 3-5.
NPB-195
EXITSEL
%SP02
BPM
100110
ALARM LIMITS
UPPERLOWER
SPO2 PULSE
8517040
100
Figure 3-5: Adjusting High Pulse Rate Alarm
6. Press and hold the Down Arrow button. Verify that the Pulse upper alarmlimit display reduces to a minimum of “40” and is displayed. Press the Exitbutton.
7. Press the Limits softkey and then press the SEL softkey three times. Verifythat the Pulse lower alarm limit display indicates an alarm limit of “40” andis boxed. See Figure 3-6.
NPB-195
EXITSEL
%SP02
BPM
100110
ALARM LIMITS
UPPERLOWER
SPO2 PULSE
8517040
100
Figure 3-6: Adjusting Low Pulse Rate Alarm
Section 3: Performance Verification
3-5
8. Press and hold the Down Arrow button. Verify that the boxed Pulse loweralarm limit display reduces to a minimum of “30.”
9. Press and hold the Up Arrow button and verify that the boxed Pulse loweralarm limit display cannot be adjusted above the Pulse high limit of “40.”
10. Press the Power On/Standby button to turn the monitor off.
11. Press the Power On/Standby button to turn the NPB-195 back on.
12. Press and release the Limits softkey. Verify that the %SpO2 upper alarmlimit display is boxed and indicates an alarm limit of “100.”
13. Press the SEL softkey. Verify that the %SpO2 lower alarm limit display isboxed and indicates an alarm limit of “85.”
14. Press the SEL softkey a second time. Verify that the Pulse upper alarmlimit display is boxed and indicates an alarm limit of “170.”
15. Press the SEL softkey a third time. Verify that the Pulse lower alarm limitdisplay is boxed and indicates an alarm limit of “40.”
16. Press the Power On/Standby button to turn the monitor off.
3.3.3 Hardware and Software Tests
Hardware and software testing include the following tests.
• 3.3.3.1 Operation with a Pulse Oximeter Tester
• 3.3.3.2 General Operation
3.3.3.1 Operation with a Pulse Oximeter Tester
Operation with an SRC-2 pulse oximeter tester includes the following tests.
• 3.3.3.1.1 Alarms and Alarm Silence
• 3.3.3.1.2 Alarm Volume Control
• 3.3.3.1.3 Pulse Tone Volume Control
• 3.3.3.1.4 Dynamic Operating Range
3.3.3.1.1 Alarms and Alarm Silence
1. Connect the SRC-2 pulse oximeter tester to the sensor input cable andconnect the cable to the monitor. Set the SRC-2 as follows:
SWITCH POSITION
RATE 38
LIGHT LOW
MODULATION OFF
RCAL/MODE RCAL 63/LOCAL
2. Press the Power On/Standby button to turn the monitor on. After the normalpower-up sequence, press the following softkeys; Setup, View, and Pleth.Verify that the %SpO2 and Pulse initially indicate zeroes.
Section 3: Performance Verification
3-6
3. Move the modulation switch on the SRC-2 to LOW.
4. Verify the following monitor reactions:
a. The plethysmograph waveform begins to track the artificial pulsesignal from the SRC-2.
b. The pulse tone is heard.
c. Zeroes are displayed in the %SpO2 and Pulse displays.
d. After about 10 to 20 seconds, the monitor displays a saturation andpulse rate as specified by the tester. Verify that the values are withinthe following tolerances:
Oxygen Saturation Range 79% to 83%
Pulse Rate Range 37 to 39 bpm
e. The audible alarm sounds and both the %SpO2 and Pulse displays willflash, indicating both parameters have violated the default alarm limits.
5. Press and hold the Alarm Silence button on the front of the monitor for lessthan 2 seconds. Verify that the %SpO2 display indicates “60” and the Pulsedisplay indicates “SEC” while the Alarm Silence button is pressed. Whenthe button is released the alarm is silenced.
6. With the alarm silenced verify the following:
a. The alarm remains silenced.
b. The Audible Silence indicator lights.
c. The %SpO2 and Pulse displays continue to flash.
d. The pulse tone is still audible.
e. The audible alarm returns in approximately 60 seconds.
7. Press and hold the Alarm Silence button. Press the Down Arrow buttonuntil the Pulse display indicates “30.” Press the Up Arrow button and verifythat the displays indicate 60 SEC, 90 SEC, 120 SEC, and OFF. Release thebutton when the display indicates “OFF. "
8. Press and release the Alarm Silence button. Verify that the Alarm SilenceIndicator flashes.
9. Wait approximately 3 minutes. Verify that the alarm does not return. After3 minutes, the alarm silence reminder beeps three times, and will continueto do so at approximately 3-minute intervals.
Section 3: Performance Verification
3-7
3.3.3.1.2 Alarm Volume Control
After completing the procedure in paragraph 3.3.3.1.1 above:
1. Press and hold the Alarm Silence button and verify the following:
a. “OFF” is displayed for approximately 2 seconds.
b. After 2 seconds, a steady tone is heard at the default alarm volumesetting, the %SpO2 display indicates “VOL,” and the Pulse displayindicates the default setting of 5.
2. While still pressing the Alarm Silence button, press the Down Arrow buttonuntil an alarm volume setting of 1 is displayed. Verify that the volume ofthe alarm has decreased but is still audible.
3. Continue pressing the Alarm Silence button and press the Up Arrow buttonto increase the alarm volume setting to a maximum value of 10. Verify thatthe volume increases. Press the Down Arrow button until a comfortableaudio level is attained.
4. Release the Alarm Silence button. The tone will stop.
3.3.3.1.3 Pulse Tone Volume Control
1. Press the Up Arrow button and verify that the beeping pulse tone soundlevel increases.
2. Press the Down Arrow button and verify that the beeping pulse tonedecreases until it is no longer audible. Press the Up Arrow button to returnthe beep volume to a comfortable level.
3.3.3.1.4 Dynamic Operating Range
The following test sequence verifies proper monitor operation over a range ofinput signals.
1. Connect the SRC-2 to the NPB-195 and turn the NPB-195 on.
2. Place the SRC-2 in the RCAL 63/LOCAL mode.
3. Set the SRC-2 as indicated in Table 3-1. Verify that the NPB-195 readingsare within the indicated tolerances. Allow the monitor several seconds tostabilize the readings.
Note: A asterisk “*” indicates values that produce an alarm. Press the AlarmSilence button to silence the alarm.
Table 3-1: Dynamic Operating Range
SRC-2 Settings NPB-195 IndicationsRATE LIGHT MODULATION SpO2 Pulse Rate38 HIGH2 LOW 79 - 83* 35 - 41*112 HIGH1 HIGH 79 - 83* 109 - 115201 LOW LOW 79 - 83* 198 - 204*201 LOW HIGH 79 - 83* 198 - 204*
Section 3: Performance Verification
3-8
3.3.3.1.5 Nurse Call
Note: The Nurse Call tests must be performed with the instrument operatingon AC power.
1. Connect the negative lead of a voltmeter to pin 10 and positive lead to pin11 of the serial port on the back of the instrument (Figure 10-1). Ensurethat the audible alarm is not silenced or turned off.
2. Set the SRC-2 to create an alarm condition. Verify an output voltage at pins10 and 11 between +5 to +12 VDC.
3. Press the Alarm Silence button. With no active audible alarm, the outputvoltage at pins 10 and 11 must be between -5 to -12 VDC.
4. Turn the instrument off.
3.3.3.1.6 Operation on Battery Power
1. Turn the instrument on using AC Power.
2. Disconnect the instrument from AC and verify that the AC Power Indicatorturns off.
3. Verify that the instrument continues monitoring normally and that the LowBattery Indicator is not lit.
Note: If the Low Battery Indicator is illuminated, perform the procedureoutlined in step 3.3.1.
4. Connect the instrument to AC and verify that the AC Power Indicator turnson and that the instrument is monitoring normally.
3.3.3.2 General Operation
The following tests are an overall performance check of the system:
• 3.3.3.2.1 LED Excitation Test
• 3.3.3.2.2 Operation with a Live Subject
3.3.3.2.1 LED Excitation Test
This procedure uses normal system components to test circuit operation. ANellcor Oxisensor® II oxygen transducer, model D-25, is used to examine LEDintensity control. The red LED is used to verify intensity modulation caused bythe LED intensity control circuit.
1. Connect the monitor to an AC power source.
2. Connect an EC-4 or EC-8 sensor input cable to the monitor.
3. Connect a D-25 sensor to the sensor input cable.
4. Press the Power On/Standby button to turn the monitor on.
5. Leave the sensor open with the LEDs and photodetector visible.
6. After the monitor completes its normal power-up sequence, verify that thesensor LED is brightly lit.
Section 3: Performance Verification
3-9
7. Slowly move the sensor LED in proximity to the photodetector element ofthe sensor. Verify, as the LED approaches the optical sensor, that the LEDintensity decreases.
8. Open the sensor and notice that the LED intensity increases.
9. Repeat step 7 and the intensity will again decrease. This variation is anindication that the microprocessor is in proper control of LED intensity.
10. Turn the NPB-195 off.
3.3.3.2.2 Operation with a Live Subject
Patient monitoring involves connecting the monitor to a live subject for aqualitative test.
1. Ensure that the monitor is connected to an AC power source.
2. Connect an EC-4 or EC-8 sensor extension cable to the monitor.
3. Connect a Nellcor Durasensor® oxygen transducer, model DS-100A, to thesensor input cable.
4. Clip the DS-100A to the subject as recommended in the sensor’s directionsfor use.
5. Press the Power On/Standby button to turn the monitor on and verify thatthe monitor is operating.
6. The monitor should stabilize on the subject’s physiological signal in about15 to 30 seconds. Verify that the oxygen saturation and pulse rate arereasonable for the subject.
3.4 SAFETY TESTS
NPB-195 safety tests meet the standards of, and are performed in accordancewith, IEC 601-1 (EN 60601-1, Second Edition, 1988; Amendment 1, 1991-11,Amendment 2, 1995-03) and UL 2601-1 (August 18, 1994), for instrumentsclassified as Class 1 and TYPE BF and AAMI Standard ES1 (ANSI/AAMI ES11993).
• Ground Integrity
• Electrical Leakage
3.4.1 Ground Integrity
This test checks the integrity of the power cord ground wire from the AC plug tothe instrument chassis ground. The current used for this test is < 6V RMS 50 or60 Hz and 25 A.
1. Connect the monitor AC mains plug to the analyzer as recommended by theanalyzer operating instructions.
2. Connect the analyzer resistance input lead to the equipotential terminal(grounding lug) on the rear panel of the instrument. Verify that the analyzerindicates 100 milliohms or less.
Section 3: Performance Verification
3-10
3.4.2 Electrical Leakage
The following tests verify the electrical leakage of the monitor:
• Earth Leakage Current
• Enclosure Leakage Current
• Patient Applied Risk Current
• Patient Isolation Risk Current (Mains on Applied Part)
Note: For the following tests, ensure that the AC switch on the rear of theinstrument is configured for the AC voltage being supplied.
3.4.2.1 Earth Leakage Current
This test is in compliance with IEC 601-1 (earth leakage current) and AAMIStandard ES1 (earth risk current). The applied voltage for AAMI ES1 is 120VAC 60 Hz, for IEC 601-1 the voltage is 264 VAC 50 to 60 Hz. Allmeasurements shall be made with the power switch in both the “On” and “Off”positions. See Table 3-2.
1. Connect the monitor AC plug to the electrical safety analyzer asrecommended by the analyzer operating instructions.
2. The equipotential terminal is not connected to ground.
Table 3-2: Earth Leakage Current Limits
ACPOLARITY
LINECORD
NEUTRALCORD
LEAKAGECURRENT
Normal Closed Closed 500 µAReversed Closed Closed 500 µANormal Open Closed 1000 µANormal Closed Open 1000 µA
3.4.2.2 Enclosure Leakage Current
This test is in compliance with IEC 601-1 (enclosure leakage current) and AAMIStandard ES1 (enclosure risk current). This test is for ungrounded enclosurecurrent, measured between enclosure parts and earth. The applied voltage forAAMI/ANSI is 120 VAC 60 Hz, and for IEC 601-1 the applied voltage is 264VAC 50 to 60 Hz.
1. Connect the monitor AC plug to the electrical safety analyzer asrecommended by the analyzer operating instructions.
2. Place a 200-cm2 foil in contact with the instrument case, making sure thefoil is not in contact with any metal parts of the enclosure that may begrounded. Measure the leakage current between the foil and earth.
The analyzer leakage indication must not exceed values listed in Table 3-3:
Section 3: Performance Verification
3-11
Table 3-3: Enclosure Leakage Current Limits
AC LINECORD
NEUTRALLINE
CORD
POWERLINE
GROUNDCABLE
IEC 601-1 AAMI/ANSIES1
STANDARD
Closed Closed Closed 100 µA 100 µAClosed Closed Open 500 µA 300 µAClosed Open Closed 500 µA 300 µAOpen Closed Closed 500 µA 100 µAOpen Open Closed 500 µA 300 µAOpen Closed Open 500 µA 300 µA
3.4.2.3 Patient Applied Risk Current
This test is in compliance with AAMI Standard ES1 (patient applied riskcurrent), and IEC 601-1 (patient auxiliary current). The leakage current ismeasured between any individual patient connection and power (earth) ground.The applied voltage for AAMI/ANSI is 120 VAC 60 Hz, and for IEC 601-1 theapplied voltage is 264 VAC 50 to 60 Hz.
1. Configure the electrical safety analyzer as follows:
Function: Patient Leakage
Range: µA
2. Connect the monitor AC plug to the electrical safety analyzer asrecommended by the analyzer operating instructions for Patient LeakageCurrent.
3. Connect the patient leakage input lead of the electrical safety analyzer to allpins of the monitor's patient cable at the end of the cable.
4. The equipotential terminal is not connected to ground.
5. All functional earth terminals are not connected to ground.
6. Measure the leakage current between the patient connector and earth. SeeTable 3-4.
Table 3-4: Patient Leakage Current Limits
AC LINEPOLARITY
NEUTRALLINE
POWERLINE
GROUNDCABLE
IEC 601-1 AAMI/ANSIES1
STANDARD
Normal Closed Closed 100 µA 10 µANormal Open Closed 500 µA 50 µANormal Closed Open 500 µA 50 µAReverse Closed Closed 100 µA 10 µAReverse Open Closed 500 µA 50 µAReverse Closed Open 500 µA 50 µA
Section 3: Performance Verification
3-12
3.4.2.4 Patient Isolation Risk Current - (Mains Voltage on the Applied Part)
This test is in compliance with AAMI Standard ES1 (patient isolation riskcurrent [sink current]), and IEC 601-1 (patient leakage current). Patient LeakageCurrent is the measured value in a patient connection if mains voltage isconnected to that patient connection. The applied voltage for AAMI/ANSI is120 VAC 60 Hz, and for IEC 601-1 the applied voltage is 264 VAC 50 to 60 Hz.
Warning: AC mains voltage will be present on the patient applied partterminals during this test. Exercise caution to avoid electrical shock hazard.
1. Configure the electrical safety analyzer as follows:
Function: Patient Leakage (Mains On Applied Part)
Range: µA
2. Connect the monitor AC plug to the electrical safety analyzer asrecommended by the operating instructions for patient sink (leakage)current.
3. Connect the patient leakage input lead to the electrical safety analyzer to allconnectors in the patient cable at the patient end of the cable.
4. The equipotential terminal is not connected to ground.
5. All functional earth terminals are not connected to ground.
6. The analyzer leakage current must not exceed the values shown inTable 3-5.
Table 3-5: Patient Leakage Current Test Configurations -Mains Voltage on the Applied Part
AC LINEPOLARITY
NEUTRALLINE
POWERLINE
GROUNDCABLE
IEC 601-1 AAMI/ANSIES1
STANDARD
Normal Closed Closed 5 mA 50 µAReverse Closed Closed 5 mA 50 µA
4-1
SECTION 4: POWER-ON SETTINGS AND SERVICE FUNCTIONS4.1 Introduction4.2 Power-on Settings4.3 Service Functions
4.1 INTRODUCTION
This section discusses how to reconfigure power-on default values, access theservice functions, and set the clock.
4.2 POWER-ON SETTINGS
The following paragraphs describe how to change power-on default settings.
Through the use of softkeys shown in Figure 1-2, the user can change alarmlimits, the type of display, baud rate, time and date, and trends to view. Adecimal point is added to the right of a display when the alarm limit for thatdisplay has been changed to a value that is not a power-on default value. If thenew value is saved as a power-on default value, the decimal point will beremoved. By using the service functions, changes can be saved as power-ondefault values.
Some values cannot be saved as power-on default values. An SpO2 Low limitless than 80 will not be saved as a power-on default. Audible Alarm Off will notbe accepted as a power-on default. An attempt to save either of these values as adefault will result in an invalid tone. Both values can be selected for the currentpatient, but they will be lost when the instrument is turned off.
4.2.1 Factory Default Settings
Factory default settings for the NPB-195 are listed in Table 4-1. Refer to theOperator's manual for changing the parameters listed in Table 4-1. Set desiredparameter limits as desired. Refer to paragraph 4-3 to apply these newparameters as default parameters.
Section 4: Power-On Settings and Service Functions
4-2
Table 4-1: Factory Default Settings
Parameter Default ValueSpO2 High 100%SpO2 Low 85%Pulse Rate High 170 bpmPulse Rate Low 40 bpmAlarm Volume Level 5Alarm Silence Duration 60 secondsAlarm Silence Restriction Sound ReminderPulse Beep Volume Level 4Baud Rate 9600Display PlethTrend SaturationContrast Mid-rangeLanguage English
4.3 SERVICE FUNCTIONS
4.3.1 Introduction
Service functions can be used to select institutional defaults, and to accessinformation about the patient or instrument. Only a Mallinckrodt CustomerService Engineer should access some of the items available through the servicefunctions. These functions will be described in the text to follow.
4.3.2 Accessing the Service Functions
All service functions are accessible only if the sensor cable is disconnected fromthe instrument. Simultaneously press the 4th softkey from the left and thecontrast button for more than 3 seconds. The menu bar will change to theheadings listed in Figure 4-1.
Note: If a “Sensor Disconnected” prompt appears on the screen, press theAlarm Silence button and repeat the above procedure.
Note: If the above steps are performed with a sensor cable connected, only theParam and Exit softkeys appear on the screen.
NPB-195
NEXTPARAM PRINT EXIT
%SP02
BPM- - -- - -
Figure 4-1: Service Function Softkeys
Section 4: Power-On Settings and Service Functions
4-3
Figure 4-2 can be used as a quick reference showing how to reach differentsoftkey functions. Items reached through the Param softkey can be accessedduring normal operation. Functions provided by the Print and Next softkeyscannot be accessed when a sensor cable is connected to the instrument. Each ofthe various functions is described in the text to follow.
Param Print Next
Reset
Downld Alarms Next
Trend Errlog Instat Info
Exit
Save
Yes No
Yes No
ExitSel
Exit
Exit
Contrast Paragraph 4.3.2.1 Paragraph 4.3.2.2 Paragraph 4.3.2.3
Paragraph 4.3.2.1 and 4.3.2.4
BPM
Figure 4-2: Service Function Softkey Map
4.3.2.1 Exit & Next Softkeys
NEXT
There are not enough buttons to display all of the options that are available atsome levels of the menu. Pressing the Next button allows you to view additionaloptions available at a given menu level.
EXIT
To back up one menu level, press the Exit button. The service functions can beexited by repeatedly pressing the Exit button.
4.3.2.2 Param
When the Param softkey is pressed, the function of the softkeys changes asshown in Figure 4-3. These options can be accessed without disconnecting thesensor cable from the instrument.
Section 4: Power-On Settings and Service Functions
4-4
NPB-195
RESET SAVE EXIT
%SP02
BPM- - -- - -
Figure 4-3: Param Softkeys
RESET
The Reset button can be used if alarm values stored in memory have beenchanged from factory default values. If Yes is pressed, the instrument soundsthree tones and the alarm limits return to factory default values. When No ispressed, no changes are made to the values stored in memory.
SAVE
When adjustable values are changed from factory default, the Save button can beused to preserve the settings as institutional power-on default values. PressingYes stores the current settings in memory. The instrument sounds three tonesindicating that the change has been saved as power-on default values. If aninvalid tone is sounded, the parameter cannot be saved as a power-on default(see paragraph 4.2).
These values will continue to be used through power-on and -off cycles untilthey are changed and saved again, or until they are reset. If No is pressed, thechanged values will not be saved.
4.3.2.3 Print
Accessing the Print softkey makes three printouts available. See Section 10 forinformation about how to make connections to the serial port and how data ispresented in a printout. The appropriate printout can be selected by pressing thecorresponding softkey. Figure 4-4 represents the softkey configuration after thePrint softkey has been selected.
Up to 24 hours of data can be retrieved from the printouts described below.When the instrument is turned on, a line of data is recorded every 5 seconds. Asan example, an instrument that is used 6 hours a week would take 4 weeks to fillits memory.
Note: The two-letter codes and the symbols that occur in the printout aredescribed in Table 10-2.
NPB-195
NEXTTREND ERRLOG EXIT
%SP02
BPM- - -- - -
Figure 4-4: Print Softkeys
Section 4: Power-On Settings and Service Functions
4-5
TREND
A Trend printout will include all data recorded for up to 24 hours of monitoringsince the last Clear data was performed. A trend line is recorded every 5seconds or whenever an alarm condition has occurred. Figure 4-5 is an exampleof a Trend printout.
NPB-195 Version 1.0.0.000 TREND SpO2 Limit: 30-100% PR Limit: 100-180 bpm
TIME %SpO2 PR (bpm) PA
01-Jul-97 14:00:00 100 120 220
01-Jul-97 14:00:05 100 124 220
01-Jul-97 14:00:10 100 190 220
01-Jul-97 14:00:15 100 190 220
01-Jul-97 18:00:43 - - - - - - - - -
01-Jul-97 18:00:48 - - - - - - - - -
NPB-195 Version 1.0.0.000 Trend SpO2 Limit: 80-100% PR Limit: 60-180 bpm
Time %SpO2 PR (bpm) PA
01-Jul-97 18:00:53 - - - - - - - - -
01-Jul-97 18:00:58 - - - - - - - - -
01-Jul-97 18:01:03 98 100 140
01-Jul-97 18:01:08 98 181* 190
01-Jul-97 18:01:13 99 122 232
Output Complete
Figure 4-5: Trend Printout
The first two lines are the column heading lines. The first line includesinformation about the type of instrument delivering the information, the softwarelevel, type of printout, and alarm parameters. The second line consists of thecolumn headings These lines are printed out every 25 lines or when a change toan alarm parameter is made. Patient data is represented with a date and timestamp for the data. In the example above, the “- - -” means that a sensor wasconnected but no data was being received (patient disconnect). Patient data thatis outside of an alarm limit is marked with an asterisk (*).
At the end of the printout “Output Complete” will be printed. This indicates thatthere was no corruption of data. If the Output Complete statement is not printedat the end of the printout, the data must be considered invalid.
ERRLOG
A list of all the errors recorded in memory can be obtained by pressing theErrlog softkey. The first line the type of instrument producing the printout,software level, type of printout and the time of the printout. The second line liststhe column headings. An example of an Errlog printout is shown in Figure 4-6.
Section 4: Power-On Settings and Service Functions
4-6
NPB-195 Version 1.0.0.000 Error Log Time: 14600:00:07
Op Time Error Task Addr Count
10713:21:03 52 12 48F9 100
00634:26:01 37 4 31A2 3
Output Complete
Figure 4-6: Errlog Printout
INSTAT
A Delete softkey, described in the Operator's manual, allows the user to clear themost recent trend data. Cleared trends can still be retrieved from the instrumentthrough an Instat printout. Instat can be accessed by pressing Next after the Printsoftkey has been selected.
The oldest cleared trend will become Trend 01 on the Instat printout. If a Trend01 already existed in memory from an earlier Clear, the next clear will becomeTrend 02. Every time a Clear is performed from the User Softkeys, the numberof existing trends will increase by 1.
Figure 4-7 illustrates an Instat printout. The first line is for instrument type,software revision level, type of printout, and alarm parameter settings. Thesecond line lists the column headings. A line of data is recorded for every 5seconds of instrument operation. Up to 24 hours of instrument operation datacan be recorded.
The final line on the printout is Output Complete. This indicates that data hasbeen successfully transmitted with no corruption. If no Output Complete line isprinted, the data should be considered invalid.NPB-195 Version 1.0.0.000 Instrument SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME Trend 01 %SpO2 PR (bpm) PA SpO2 Status UIF Status Aud01-Jul-97 14:00:00 - - - - - - - - - SD BU LB AO L01-Jul-97 14:00:05 - - - - - - - - - PS BU LB AO01-Jul-97 14:00:10 100 120 220 BU LB01-Jul-97 14:00:15 100 120 220 BU LBNPB-195 Version 1.0.0.000 Instrument SpO2 Limit: 80-100% PR Limit: 60-180 bpmTIME Trend 01 %SpO2 PR (bpm) PA SpO2 Status UIF Status Aud01-Jul-97 14:24:24 79* 58* 220 PS SL PL BU LB M01-Jul-97 14:24:29 79* 57* 220 PS SL PL BU LB AS M01-Jul-97 14:24:29 0* 0* - - - PS LP SL PL BU LB AS HNPB-195 Version 1.0.0.000 Instrument SpO2 Limit: 80-100% PR Limit: 60-180 bpmTIME Trend 01 %SpO2 PR (bpm) PA SpO2 Status UIF Status Aud11-Jul-97 7:13:02 99 132* 220 PH BU M11-Jul-97 7:13:07 99 132* 220 PH BU M11-Jul-97 7:13:12 99 132* 220 PH BU M11-Jul-97 7:13:17 99 132* 220 PH BU M11-Jul-97 7:13:22 99 132* 220 PH BU M11-Jul-97 7:13:27 99 132* 220 PH BU M11-Jul-97 7:13:32 99 132* 220 PH BU MOutput Complete
Figure 4-7: Instat Printout
Section 4: Power-On Settings and Service Functions
4-7
4.3.2.4 Next
Additional options can be accessed from the main Service Functions menu bypressing the Next softkey. When Next is pressed, the softkeys change to thefunctions shown in Figure 4-8.
NPB195
DOWNLD ALARMS EXIT NEXT
BPM
Figure 4-8: Next Softkeys
DOWNLD
When Downld is selected, the instrument will display the revision of the BootCode. To exit Downld, cycle power to the instrument by pressing the PowerOn/Standby button.
ALARMS
Pressing the Alarms softkey can change characteristics of the audible alarm.When the Alarms softkey is pressed, the softkey’s functions change as shown inFigure 4-9.
NPB-195
SEL EXIT
%SP02
BPM- - -- - -
Figure 4-9: Alarms Softkeys
SEL
The Sel softkey is used to select what function of the audible alarm is going tobe changed. A box can be cycled between two choices: Allow and Reminder.
When Allow is selected, a choice is given between allowing an audible alarm offor disabling the audible alarm off. Pressing the Up or Down arrow key cyclesbetween yes and no. If Yes is selected, the operator has the option of selectingAudible Alarm Off. If No is selected, the operator will not be given the optionof selecting Audible Alarm Off.
If the audible alarm is disabled or silenced, a reminder tone can be soundedevery three minutes to notify the user of this condition. The Up and Down arrowkeys can be used to change the choice from Yes to No. Selecting Yes enablesthe Reminder and No disables the Reminder.
5-1
SECTION 5: TROUBLESHOOTING5.1 Introduction5.2 How to Use this Section5.3 Who Should Perform Repairs5.4 Replacement Level Supported5.5 Obtaining Replacement Parts5.6 Troubleshooting Guide5.7 Error Codes
5.1 INTRODUCTION
This section explains how to troubleshoot the NPB-195 if problems arise.Tables are supplied that list possible monitor difficulties, along with probablecauses, and recommended actions to correct the difficulty.
5.2 HOW TO USE THIS SECTION
Use this section in conjunction with Section 3, Performance Verification, andSection 7, Spare Parts. To remove and replace a part you suspect is defective,follow the instructions in Section 6, Disassembly Guide. The circuit analysissection in the Technical Supplement offers information on how the monitorfunctions.
5.3 WHO SHOULD PERFORM REPAIRS
Only qualified service personnel should open the monitor housing, remove andreplace components, or make adjustments. If your medical facility does not havequalified service personnel, contact Mallinckrodt's Technical Services or yourlocal Mallinckrodt representative.
5.4 REPLACEMENT LEVEL SUPPORTED
The replacement level supported for this product is to the printed circuit board(PCB) and major subassembly level. Once you isolate a suspected PCB, followthe procedures in Section 6, Disassembly Guide, to replace the PCB with aknown good PCB. Check to see if the trouble symptom disappears and that themonitor passes all performance tests. If the trouble symptom persists, swap backthe replacement PCB with the suspected malfunctioning PCB (the original PCBthat was installed when you started troubleshooting) and continuetroubleshooting as directed in this section.
5.5 OBTAINING REPLACEMENT PARTS
Mallinckrodt's Technical Services provides technical assistance information andreplacement parts. To obtain replacement parts, contact Mallinckrodt'sTechnical Services Department or your local Mallinckrodt representative. Referto parts by the part names and part numbers listed in Section 7, Spare Parts.
Section 5: Troubleshooting
5-2
5.6 TROUBLESHOOTING GUIDE
Problems with the NPB-195 are separated into the categories indicated inTable 5-1. Refer to the paragraph indicated for further troubleshootinginstructions.
Note: Taking the recommended actions discussed in this section will correctthe majority of problems you may encounter. However, problems notcovered here can be resolved by calling Mallinckrodt's TechnicalServices Department or your local Mallinckrodt representative.
Table 5-1: Problem Categories
Problem Area Refer to Paragraph1. Power• No power-up on AC and/or DC• Fails power-on self-test• Powers down without apparent cause
5.6.1
2. Buttons• Monitor does not respond properly to
buttons
5.6.2
3. Display/Alarms• Displays do not respond properly• Alarms or other tones do not sound
properly or are generated withoutapparent cause
5.6.3
4. Operational Performance• Displays appear to be operational, but
monitor shows no readings• Suspect readings
5.6.4
5. Serial Port• NPB-195 serial port not functioning
properly
5.6.5
Section 5: Troubleshooting
5-3
5.6.1 Power
Power problems are related to AC and/or DC. Table 5-2 lists recommendedactions to resolve power problems.
Table 5-2: Power Problems
Condition Recommended Action1. Battery Low
indicator lightssteadily whileNPB-195 isconnected to ACand battery isfully charged.
1. Ensure that the NPB-195 is plugged into anoperational AC outlet and the AC indicator is on.
2. Check the fuses. The fuses are located in the PowerEntry Module as indicated in paragraph 6.3 andFigure 6-1 of the Disassembly Guide. Replace ifnecessary.
3. Open the monitor as described in section 6. Verifythe power supply’s output to the battery while on AC.Disconnect the battery leads from the battery andconnect a DVM to them. The voltage measuredshould be 6.80 VDC ± 0.15 VDC, and the currentshould be 400 mA ± 80 mA. Replace power supply ifabove values are not met.
4. Check the ribbon connection from the bottomenclosure to the UIF PCB, as instructed in paragraph6.11 of the Disassembly Guide section. If theconnection is good, replace the UIF PCB.
2. The NPB-195does not operatewhendisconnectedfrom AC power.
1. The battery may be discharged. To recharge thebattery, refer to paragraph 3.3.1, Battery Charge. Themonitor may be used with a less than fully chargedbattery but with a corresponding decrease inoperating time from that charge.
2. If the battery fails to hold a charge, replace the batteryas indicated in Section 6, Disassembly Guide.
3. Battery Lowindicator onduring DCoperation and analarm issounding.
There are 15 minutes or less of usable charge left on theNPB-195 battery before the instrument shuts off. At thispoint, if possible, cease use of the NPB-195 on batterypower, connect it to an AC source and allow it torecharge (approximately 14 hours). The NPB-195 maycontinue to be used while it is recharging. (A fullrecharge of the battery while the monitor is being usedtakes 18 hours.)
4. Battery does notcharge.
1. Replace battery if more than 2 years old.2. Open the monitor as described in Section 6. Verify
the power supply’s output to the battery while on AC.Disconnect the battery leads from the power supplyand connect a DVM to them. The voltage measuredshould be 6.8 VDC ± 0.15 and the current should be400 mA ± 80 mA. Replace power supply if abovevalues are not met.
Section 5: Troubleshooting
5-4
5.6.2 Buttons
Table 5-3 lists symptoms of problems relating to non-responsive buttons andrecommended actions. If the action requires replacement of a PCB, refer toSection 6, Disassembly Guide.
Table 5-3: Button Problems
Condition Recommended Action1. The NPB-195 responds
to some, but not allbuttons.
1. Replace Top Housing assembly.2. If the buttons still do not work, replace the UIF
PCB.2. The NPB-195 turns on
but does not respond toany of the buttons.
1. Replace Top Housing assembly.2. If the buttons still do not work, replace the UIF
PCB.
5.6.3 Display/Alarms
Table 5-4 lists symptoms of problems relating to non-functioning displays,audible tones or alarms, and recommended actions. If the action requiresreplacement of a PCB or module, refer to Section 6, Disassembly Guide.
Table 5-4: Display/Alarms Problems
Condition Recommended Action1. Display values are
missing or erratic.1. If the sensor is connected, replace the sensor
connector assembly.2. If the condition persists, replace the sensor
extension cable.3. If the condition still persists, replace the UIF
PCB.2. Display pixels do not
light.1. Check the connection between the UIF PCB and
the Display PCB.2. If the condition does not change, replace the
Display PCB.3. If the condition still persists, replace the UIF
PCB.3. Alarm sounds for no
apparent reason.1. Moisture or spilled liquids can cause an alarm to
sound. Allow the monitor to dry thoroughlybefore using.
2. If the condition persists, replace the UIF PCB.4. Alarm does not sound. 1. Replace the speaker as described in Section 6,
Disassembly Guide.2. If the condition persists, replace the UIF PCB.
Section 5: Troubleshooting
5-5
5.6.4 Operational Performance
Table 5-5 lists symptoms of problems relating to operational performance (noerror codes displayed) and recommended actions. If the action requiresreplacement of a PCB or module, refer to Section 6, Disassembly Guide.
Table 5-5: Operational Performance Problems
Condition Recommended Action1. The Pulse AMPLITUDE
indicator seems toindicate a pulse, but thedigital displays showzeroes.
1. The sensor may be damaged; replace it.2. If the condition still persists, replace the UIF
PCB.
2. SpO2 or Pulse valueschange rapidly; PulseAMPLITUDE indicator iserratic.
1. The sensor may be damp or may have beenreused too many times. Replace it.
2. An electrosurgical unit (ESU) may beinterfering with performance:
– Move the NPB-195 and its cables and sensorsas far from the ESU as possible.
– Plug the NPB-195 power supply and the ESUinto different AC circuits.
– Move the ESU ground pad as close to thesurgical site as possible and as far away fromthe sensor as possible.
3. Verify the performance with the proceduresdetailed in Section 3.
4. If the condition still persists, replace the UIFPCB.
Section 5: Troubleshooting
5-6
5.6.5 Serial Port
Table 5-6 lists symptoms of problems relating to the serial port andrecommended actions. If the action requires replacement of the PCB, refer toSection 6, Disassembly Guide.
Table 5-6: Serial Port Problems
Condition Recommended Action1. No printout is being
received1. The unit is running on battery power.
Connect to an AC source.2. The monitor’s baud rate does not match the
printer. Change the baud rate of the monitorfollowing instructions in paragraph 10.2.
3. If the condition still persists, replace the UIFPCB.
2. The nurse call is notworking.
1. The unit is running on battery power.Connect to an AC source.
2. Verify connections are made between pins 10(GND) and 11 (nurse call) of the serial port.
3. Verify output voltage between ground pin 10and pin 11 is -3 to -10 VDC (no alarm) and+3 to +10 VDC (during alarm)
4. If the condition still persists, replace the UIFPCB.
Section 5: Troubleshooting
5-7
5.7 ERROR CODES
An error code is displayed when the NPB-195 detects a non-correctable failure.When this occurs, the unit will stop monitoring, sound a low priority alarm thatcannot be silenced, clear patient data from the display, and display an error code.Table 5-7 provides a complete list of error codes and possible solutions.
Table 5-7: Error Codes
Code Meaning Possible Solutions1 POST failure Replace UIF PCB4 Battery dead 1. Check the voltage selector
switch.2. Charge battery for 14 hours3. Leads of battery reversed (see paragraph 6.6)4. Replace battery
5 Too many microprocessor resetswithin a period of time
1. Cycle power2. Replace UIF PCB if code 5 repeatedly occurs3. Replace Power Supply
6 Boot CRC error Replace UIF PCB7 Error on UIF PCB 1. Cycle power to clear error.
2. Check voltage selector switch for proper setting.3. Replace UIF PCB
11 Flash ROM corruption Replace UIF PCB76 Error accessing EEPROM Replace UIF PCB80 Institutional default values lost
and reset to factory defaultvalues
1. Cycle power2. Replace UIF PCB if code 80 repeatedly occurs
82 Time clock lost 1. Reset time clock2. Battery power was lost; check the battery3. Replace the Power Supply
84 Internal communications error Replace UIF PCB
6-1
SECTION 6: DISASSEMBLY GUIDE6.1 Introduction6.2 Prior to Disassembly6.3 Fuse Replacement6.4 Monitor Disassembly6.5 Monitor Reassembly6.6 Battery Replacement6.7 Power Entry Module Removal/Installation6.8 Power Supply Removal/Installation6.9 Cooling Fan Removal/Installation6.10 Display PCB Removal/Installation6.11 UIF PCB Removal/Installation6.12 Alarm Speaker Removal/Installation
6.1 INTRODUCTION
The NPB-195 can be disassembled down to all major component parts,including:
• PCBs
• battery
• cables
• chassis enclosures
The following tools are required:
• small, Phillips-head screwdriver
• medium, Phillips-head screwdriver
• small blade screwdriver
• needle-nose pliers or 1/4-inch socket
• torque wrench, 10 inch-pounds (1.13 newton-meters)
WARNING: Before attempting to open or disassemble the NPB-195,disconnect the power cord from the NPB-195.
Caution: Observe ESD (electrostatic discharge) precautions when workingwithin the unit.
Note: Some spare parts have a business reply card attached. When youreceive these spare parts, please fill out and return the card.
6.2 PRIOR TO DISASSEMBLY
1. Turn the NPB-195 Off by pressing the Power On/Standby button.
2. Disconnect the monitor from the AC power source.
Section 6: Disassembly Guide
6-2
6.3 FUSE REPLACEMENT
1. Complete procedure in paragraph 6.2.
2. Disconnect the power cord from the back of the monitor.
3. Remove the fuse drawer from the power module by pressing down on thetab in the center and pulling out as shown in Figure 6-1.
Figure 6-1: Fuse Removal
4. Put new fuses of equivalent size and rating in the drawer and reinsert thedrawer in the power module.
Section 6: Disassembly Guide
6-3
6.4 MONITOR DISASSEMBLY
1. Set the NPB-195 upside down, as shown in Figure 6-2.
Corner screws
Figure 6-2: NPB-195 Corner Screws
2. Remove the four corner screws.
Caution: Observe ESD (electrostatic discharge) precautions whendisassembling and reassembling the NPB-195 and when handling any of thecomponents of the NPB-195.
3. Separate the top case from the bottom case of the monitor, being careful notto stress the wire harnesses between the cases. Place the two halves of themonitor on the table as shown in Figure 6-3.
4. Disconnect the Power Supply from J6 on the UIF PCB.
Section 6: Disassembly Guide
6-4
J6
Power supplyharness
Figure 6-3: Separating Case Halves
6.5 MONITOR REASSEMBLY
1. Connect the Power Supply to J6 on the UIF PCB.
2. Place the top case over the bottom case, being careful to align the lens,Power Entry Module, and the fan with the slots in the top case.
Caution: When reassembling the NPB-195, tighten the screws that hold thecases together to a maximum of 10 inch-pounds. Over-tightening couldstrip out the screw holes in the top case, rendering it unusable.
3. Install the four corner screws.
Section 6: Disassembly Guide
6-5
6.6 BATTERY REPLACEMENT
Removal
1. Follow the procedure in paragraphs 6.2 and 6.4.
2. Remove the two screws from the battery bracket and lift the battery out ofthe bottom case as shown in Figure 6-4.
3. Be sure to note the polarity of the leads. Use needle-nose pliers todisconnect the leads from the battery.
Figure 6-4: NPB-195 Battery
4. The lead-acid battery is recyclable. Do not dispose of the battery by placingit in the regular trash. Dispose of battery in accordance with localregulations or return to Mallinckrodt's Technical Services Department fordisposal.
Installation
5. Connect the leads to the battery. The red wire connects to the positiveterminal, and the black wire connects to the negative terminal. SeeFigure 6-5.
6. Insert the new battery into the bottom case with the negative terminaltowards the outside of the monitor. Install the bracket and grounding leadwith the two screws.
Section 6: Disassembly Guide
6-6
W1to
EquipotentialLug
W2to
"L" onPEM
W3to
"N" on PEM
W5 -Black
W4 + Red
EquipotentialLug
J1
Figure 6-5: Internal Power Connections
7. Complete the procedure in paragraph 6.5.
8. Turn the monitor on and verify proper operation.
Section 6: Disassembly Guide
6-7
6.7 POWER ENTRY MODULE (PEM) REMOVAL/INSTALLATION
Removal
1. Complete the procedures in paragraphs 6.4.
2. Push the top of the Power Entry Module (PEM) in from the outside of thecase, and lift up.
3. Use needle-nose pliers to disconnect the leads from the PEM(see Figure 6-6).
G
L
N
Figure 6-6: Power Entry Module
Installation
4. Reconnect the three leads. The blue wire from W3 on the power supplygoes to the terminal labeled “N” on the PEM. The brown wire from W2 onthe power supply connects to the terminal labeled “L.” The center terminal(labeled "G") at the top of the PEM is for the ground wire (Figure 6-6).
5. Install the PEM in the bottom case with the fuse drawer facing down. A tabin the bottom case holds the PEM in place. Insert the bottom wing of thePEM between the tab and the internal edge of the side wall of the bottomcase. Push the PEM down and towards the outside of the monitor until itclicks into place.
Section 6: Disassembly Guide
6-8
6. Position the AC lines from the PEM so that they do not come into contactwith components on the Power Supply PCB.
7. Complete procedure in paragraph 6.5.
6.8 POWER SUPPLY REMOVAL/INSTALLATION
Removal
1. Complete the procedures in paragraphs 6.2 and 6.4.
2. Complete steps 2 through 4 in paragraph 6.7.
3. Disconnect the fan wire harness from J1 on the Power Supply PCB (seeFigure 6-5).
4. Use a 10-mm wrench to disconnect the Power Supply ground lead from theequipotential lug (Figure 6-5).
5. Remove the seven screws shown in Figure 6-7.
Figure 6-7: Power Supply
6. Lift the Power Supply out of the bottom case.
Installation
7. Place the Power Supply in the bottom case.
Caution: When installing the Power Supply, tighten the seven screws to amaximum of 4 inch-pounds. Over-tightening could strip out the screw holesin the bottom case, rendering it unusable.
Section 6: Disassembly Guide
6-9
8. Install the seven screws in the Power Supply and tighten.
9. Connect the fan harness to J1 on the Power Supply.
10. Complete steps 4 through 6 in paragraph 6.7.
11. Complete procedure in paragraph 6.5.
6.9 COOLING FAN REMOVAL/INSTALLATION
Removal
1. Complete the procedures in paragraphs 6.2 and 6.4.
2. Disconnect the fan wire harness from J1 on the Power Supply PCB (seeFigure 6-5).
3. Lift the cooling fan from the slots in the bottom case (see Figure 6-8).
J1
Figure 6-8: Cooling Fan
Installation
4. Insert the cooling fan into the slots in the bottom case with the padded sideson the top and bottom and the fan’s harness to the handle side of the case.
5. Connect the cooling fan wire harness to J1 on the Power Supply PCB.
6. Complete procedure 6-5.
Section 6: Disassembly Guide
6-10
6.10 DISPLAY PCB REMOVAL/INSTALLATION
Removal
Note: The LCD panel contains toxic chemicals. Do not ingest chemicals from abroken LCD panel.
1. Complete procedures 6.2 and 6.4.
2. Disconnect the CCFL harness (two white wires) from J5 of the UIF PCB.See Figure 6-9.
3. Use a small blade screwdriver to pry the clip from either edge of J9, thendisconnect the Display PCB ribbon cable from the connector.
4. Remove the screw holding the clamp to the ferrite on the ribbon cable of theDisplay PCB.
Speaker wires to J13on the UIF PCB
Keypad ribbon cableto J8 on UIF PCB
Display ribbon cableto J9 on UIF PCB
CCFL wires to J5on the UIF PCB
Double-SidedTape
Figure 6-9: Display PCB
Section 6: Disassembly Guide
6-11
5. Separate the adhesive connection of the double-sided tape and lift theDisplay PCB up to remove it from the top case.
6. Remove the used double-sided tape.
Installation
7. Install new double-sided tape located as shown in Figure 6-9.
8. Slide the Display PCB into the grooves in the top case. Apply pressurebetween the top case and the display PCB to make good contact with thedouble-sided tape.
9. Connect the wire harness with two white wires to J5 of the UIF PCB.
10. Connect the Display PCB ribbon cable to J9 of the UIF PCB. Install theclip over the J9 connector.
11. Secure the ferrite on the ribbon cable from the Display PCB. Place theclamp over the ferrite and screw the clamp to the UIF PCB.
12. Complete the procedure in paragraph 6.5.
6.11 UIF PCB REMOVAL/INSTALLATION
Removal
1. Complete the procedures in paragraphs 6.2 and 6.4.
2. Complete steps 2 through 4 in paragraph 6.10.
3. Disconnect the keypad ribbon cable from J8 of the UIF PCB (Figure 6-9).J8 is a ZIF connector. Lift up on the outer shell until it clicks, then removethe ribbon cable from the connector.
4. Disconnect the speaker cable from J13 on the UIF PCB.
5. Remove the five screws in the UIF PCB. See Figure 6-10.
6. Remove the UIF PCB from the top case.
Section 6: Disassembly Guide
6-12
Figure 6-10: UIF PCB
Installation
Caution: When installing the UIF PCB, hand tighten the five screws to amaximum of 4 inch-pounds. Over-tightening could strip out the screw holesin the top case, rendering it unusable.
7. Place the UIF PCB in the top case.
8. Install the four screws in the UIF PCB.
9. Lift up on the outer shell of J8 on the UIF PCB until it clicks. Insert thekeypad ribbon cable into J8 of the UIF PCB. Slide the outer shell of J8down until it clicks.
10. Connect the speaker cable to J13 of the UIF PCB.
11. Complete steps 8 through 10 of procedure in paragraph 6.10.
12. Complete procedure in paragraph 6.5.
Section 6: Disassembly Guide
6-13
6.12 ALARM SPEAKER REMOVAL/INSTALLATION
Removal
1. Complete the procedures in paragraphs 6.2 and 6.4.
2. Disconnect the speaker wire harness from J13 on the UIF PCB(see Figure 6-11).
3. Pull the retaining tab back from the speaker and lift the speaker out of thetop case.
Connect speakerwires to J13 connector
Figure 6-11: Alarm Speaker
Installation
4. Pull the retaining tab back and insert the speaker into the top case.
5. Connect speaker wire harness to J13 on the UIF PCB.
6. Complete the procedure in paragraph 6.5.
7-1
SECTION 7: SPARE PARTS7.1 Introduction
7.1 INTRODUCTION
Spare parts, along with part numbers, are shown in Table 7-1. Item numberscorrespond to the callout numbers in Figure 7-1.
Table 7-1: Parts List
Item Description Part No.1 Top Case Assembly (Membrane Panel Included) 0484512 Fuse Drawer 6915003 Fuses 6910324 Power Entry Module 6914995 Cooling Fan 0354696 Power Supply 0352007 LCD PCB 0354038 Battery 6401199 Battery Bracket 03530710 UIF PCB 035263
Sensor Lock (not shown) 022943Alarm Speaker (not shown) 033494Ground Clip (not shown) 035400Rubber Feet (not shown) 4-003818-00Power Cord (not shown) U.S. 071505
International 901862U.K. 901863
Section 7: Spare Parts
7-2
Figure 7-1 shows the NPB-195 expanded view with numbers relating to the spareparts list.
NPB-195
10
4
7
8
1
5
9
2
3
6
Figure 7-1: NPB-195 Expanded View
8-1
SECTION 8: PACKING FOR SHIPMENT8.1 General Instructions8.2 Repacking in Original Carton8.3 Repacking in a Different Carton
To ship the monitor for any reason, follow the instructions in this section.
8.1 GENERAL INSTRUCTIONS
Pack the monitor carefully. Failure to follow the instructions in this section mayresult in loss or damage not covered by any applicable Mallinckrodt warranty. Ifthe original shipping carton is not available, use another suitable carton; NorthAmerican customers may call Mallinckrodt's Technical Services Department toobtain a shipping carton.
Prior to shipping the monitor, contact your supplier or the Mallinckrodt'sTechnical Services Department for a returned goods authorization (RGA)number. Mark the shipping carton and any shipping documents with thereturned goods authorization number.
Section 8: Packing for Shipment
8-2
8.2 REPACKING IN ORIGINAL CARTON
If available, use the original carton and packing materials. Pack the monitor asfollows:
1. Place the monitor and, if necessary, accessory items in original packaging.
Figure 8-1: Repacking the NPB-195
2. Place in shipping carton and seal carton with packing tape.
3. Label carton with shipping address, return address and RGA number, ifapplicable.
Section 8: Packing for Shipment
8-3
8.3 REPACKING IN A DIFFERENT CARTON
If the original carton is not available, use the following procedure to pack theNPB-195:
1. Place the monitor in a plastic bag.
2. Locate a corrugated cardboard shipping carton with at least 200 pounds persquare inch (psi) bursting strength.
3. Fill the bottom of the carton with at least 2 inches of packing material.
4. Place the bagged unit on the layer of packing material and fill the boxcompletely with packing material.
5. Seal the carton with packing tape.
6. Label the carton with the shipping address, return address, and RGAnumber, if applicable.
9-1
SECTION 9: SPECIFICATIONS9.1 General9.2 Electrical9.3 Physical Characteristics9.4 Environmental9.5 Alarms9.6 Factory Default Settings9.7 Performance
9.1 GENERAL
Designed to meet safety requirements of:
UL 2601-1 CSA-C22.2 No. 601-1-M90, IEC 601-1 (Class I, type BF), ISO 9919,EMC per EN 60601-1-2.
9.2 ELECTRICAL
9.2.1 Protection Class
Class I: per I.E.C. 601-1, clause 2.2.4
9.2.2 Degree of Protection
Type BF: per I.E.C. 601-1, clause 2.2.26
9.2.3 Mode of Operation
Continuous
9.2.4 Battery
Type: Rechargeable sealed lead-acid, internal
Operating time: 6 hours minimum on new, fully charged battery with no backlight or alarms
Recharge period: 14 hours for full charge (in standby)
18 hours for full charge (in use)
9.2.5 Fuses
2 each 5 x 20 mm
0.5 Amp 250 volts
9.2.6 AC Power
Selectable by switch 100-120 VAC 50/60 Hz or
200-240 VAC 50/60 Hz
Section 9: Specifications
9-2
9.3 PHYSICAL CHARACTERISTICS
9.3.1 Dimensions
3.3 in. H x 10.4 in. W x 6.8 in. D
8.4 cm H x 26.4 cm W x 17.3 cm D
9.3.2 Weight
5.7 lbs
2.6 kg
9.4 ENVIRONMENTAL
9.4.1 Operating Temperature
5°C to 40°C (+41°F to +104°F)
9.4.2 Storage Temperature
-20°C to +70°C (-4°F to +158°F)
9.4.3 Operating Altitude
-390 m to +3,048 m (-1,280 ft. to +10,000 ft.)
9.4.4 Relative Humidity
15% RH to 95% RH, noncondensing
9.5 ALARMS
9.5.1 Alarm Limit Range
% Saturation: 20–100%
Pulse: 30–250 bpm
Section 9: Specifications
9-3
9.6 FACTORY DEFAULT SETTINGS
Table 9-1: Default Settings
Parameter Default ValueSpO2 High 100%SpO2 Low 85%Pulse Rate High 170 bpmPulse Rate Low 40 bpmAlarm Volume Level 5Alarm Silence Duration 60 secondsAlarm Silence Restriction Off with reminderPulse Beep Volume Level 4Baud Rate 9600Display PlethTrend SaturationContrast Mid-rangeLanguage English
9.7 PERFORMANCE
9.7.1 Measurement Range
SpO2: 0–100%
Pulse/Heart Rate: 30–250 bpm
9.7.2 Accuracy1
9.7.2.1 SpO2
Adult: 70–100% ± 2 digits
0–69% unspecified
Neonatal: 70–100% ± 3 digits
0–69% unspecified
9.7.2.2 Pulse Rate (optically derived)2
20–250 bpm ± 3 bpm
1 Accuracies are expressed as plus or minus “X” digits (saturation percentage points) betweensaturations of 70-100%. This variation equals plus or minus one standard deviation (1 SD), whichencompasses 68% of the population. All accuracy specifications are based on testing the subjectmonitor on healthy adult volunteers in induced hypoxia studies across the specified range. Adultaccuracy is determined with Oxisensor II D-25 sensors. Neonatal accuracy is determined withOxisensor II N-25 sensors.2 Accuracies are expressed as plus or minus “X” bpm across the display range. This variationequals plus or minus 1 Standard Deviation, which encompasses 68% of the population.
10-1
SECTION 10: SERIAL PORT INTERFACE PROTOCOL10-1 Introduction10-2 Enabling the Serial Port10-3 Connecting to the Serial Port10-4 Real-Time Printout10-5 Trend Data Printout10-6 Nurse Call
10.1 INTRODUCTION
When a printer is connected to the serial port on the back of the NPB-195, a real-time printout can be obtained. A new line of data is printed every 2 seconds.Column headings will be printed after every 25 lines or if one of the values in thecolumn heading changes. Changing an alarm limit, for example, would cause anew column heading to be printed. Printouts include patient and device data. Areal-time printout cannot be obtained if the unit is operating on battery power.The real-time printout is discussed in more detail in paragraph 10.4.
10.2 ENABLING THE SERIAL PORT
Real-Time data is constantly being sent to the serial port of the NPB-195. Toreceive a real-time printout, see paragraph 10.3, for instructions to make theconnection.
The baud rate may need to be changed to match the abilities of the attachedequipment. To change the baud rate, press the Setup softkey, then the Commsoftkey. Use the Adjust Up/Down buttons to select a baud rate of 2400, 9600, or19200.
10.3 CONNECTING TO THE SERIAL PORT
Data is transmitted in the standard RS-232 format. Only three lines are used:GND is the ground, TxD represents the Transmit Data Line, and RxD is theReceive Data Line. No hardware flow control is used. However, XON/XOFFflow control is supported. Pin-outs for the serial port are listed in the chartbelow.
Table 10-1: Serial Port Pin-Outs
Pin Line2 RxD3 TxD5, 10 GND11 Nurse call1, 4, 6-9, 12-15 No Connection
The pin layouts are illustrated in Figure 10-1. The conductive shell is used asearth ground. An AMP connector is used to connect to the serial port. UseAMP connector (AMP p/n 747538-1), ferrule (AMP p/n 1-747579-2), andcompatible pins (AMP p/n 66570-2).
Section 10: Serial Port Interface Protocol
10-2
9 10 11 12 13 14 15
1 2 3 4 5 6 7 8
Figure 10-1: Serial Port Pin Layout
The serial cable can be a maximum of 25 feet and must be shielded. Connectorsat both ends of the serial cable must have the shield terminated to the full 360degrees of the connector’s metal shell. If sharp bends in the cable or roughhandling is anticipated, use a braided shield.
10.4 REAL-TIME PRINTOUT
When a Real-Time display or printout is being transmitted to a printer or PC, anew line of data is printed every 2 seconds. Every 25th line is a ColumnHeading line. A column heading line is also printed any time a value in thecolumn heading line is changed. A real-time printout is shown below in Figure10-2.
Note: If the serial output stops transmitting, turn the power off and back onagain or, if connected to a PC, send an XON (Ctrl-9) to reset themonitor.
NPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status01-Jul-97 14:00:00 100 120 22001-Jul-97 14:00:02 100 124 22001-Jul-97 14:00:04 100 190 22001-Jul-97 14:00:06 100 190* 220 PH01-Jul-97 14:00:08 100 190* 220 PH01-Jul-97 14:00:10 100 190* 220 PH01-Jul-97 14:00:12 100 190* 220 PH01-Jul-97 14:00:14 100 190* 220 PH01-Jul-97 14:00:16 100 190* 220 PH LB01-Jul-97 14:00:18 100 190* 220 PH LB01-Jul-97 14:00:20 100 190* 220 PH LB01-Jul-97 14:00:22 - - - - - - - - - SD LB01-Jul-97 14:00:24 - - - - - - - - - SD LB01-Jul-97 14:00:26 - - - - - - - - - SD01-Jul-97 14:00:28 - - - - - - - - - SD01-Jul-97 14:00:30 - - - - - - - - - SD01-Jul-97 14:00:32 - - - - - - - - - SD01-Jul-97 14:00:34 - - - - - - - - - PS01-Jul-97 14:00:36 - - - - - - - - - PS01-Jul-97 14:00:38 - - - - - - - - - PS01-Jul-97 14:00:40 - - - - - - - - - PS01-Jul-97 14:00:42 - - - - - - - - - PS01-Jul-97 14:00:44 - - - - - - - - - PSNPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status01-Jul-97 14:00:46 - - - - - - - - - PSNPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 80-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status01-Jul-97 14:00:48 79* 59* 220 SL PL LB01-Jul-97 14:00:50 79* 59* - - - PS SL PL LB
Figure 10-2: Real-Time Printout
Section 10: Serial Port Interface Protocol
10-3
10.4.1 Column Heading
To explain the printout it will be necessary to break it down to its keycomponents. The first two lines of the chart are the Column Heading shownbelow. Every 25th line is a Column Heading. A column heading is also printedwhenever a value of the Column Heading is changed. There are three ColumnHeading lines shown in Figure 10-2. Using the top row as the starting point,there are 25 lines before the second Column Heading is printed. The thirdColumn Heading was printed because the SpO2 limits changed from 30-100% to80-100%.NPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status
10.4.1.1 Data SourceNPB-195 VERSION 1.0.0.1 CRC XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status
Data in the highlighted box above represents the source of the printout ordisplay, in this case the NPB-195.
10.4.1.2 Software Revision LevelNPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status
The next data field tells the user the software level (Version 1.0.0) and asoftware verification number (CRC XXXX). Neither of these numbers shouldchange during normal operation. The numbers will change if the monitor isserviced and receives a software upgrade.
10.4.1.3 Alarm LimitsNPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status
The last data field in the top line indicates the high and the low alarm limits for%SpO2 and for the pulse rate (PR). In the example above, the low alarm limitfor SpO2 is 30% and the high alarm limit is 100%. Pulse Rate alarm limits arelow 100 bpm, and high 180 bpm.
10.4.1.4 Column HeadingsNPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status
Actual column headings are in the second row of the Column Heading line.Patient data that is presented in the chart, from left to right, is the time that theline was obtained, the current %SpO2 value being measured, the current PulseRate in beats per minute (bpm), the current Pulse Amplitude (PA), and theoperating status of the NPB-195.
10.4.2 Patient Data and Operating Status
10.4.2.1 TimeTIME %SpO2 BPM PA Status01-Jul-97 14:00:00 100 120 220
The Time column represents the NPB-195 real-time clock.
Section 10: Serial Port Interface Protocol
10-4
10.4.2.2 Patient DataNPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status01-Jul-97 14:00:06 100 190* 220 PH
Patient data and the operating status of the unit are highlighted in the displayabove. Parameter values are displayed directly beneath the heading for eachparameter. In this example the %SpO2 is 100, and the pulse rate PR is 190 beatsper minute. The “*” next to the 190 indicates that 190 beats per minute isoutside of the alarm limits, indicated in the top row, for pulse rate. If no data fora parameter is available, three dashes (- - -) will be displayed in the printout.
PA is an indication of pulse amplitude. The number can range from 0 to 254.There are no alarm parameters for this value. It can be used for trendinginformation. It is an indication of a change in pulse volume, pulse strength orcirculation.
10.4.2.3 StatusNPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 BPM PA Status01-Jul-97 14:00:06 100 190* 220 PH
The Status column indicates alarm conditions and operating status of theNPB-195. In this example the PH means Pulse High. A complete listing of thestatus codes is listed in Table 10-2. As many as 4 codes can be displayed at onetime in the Status column.
Table 10-2: Status Codes
Code Meaning
BU Battery in Use
LB Low Battery
AS Alarm Silence
AO Alarm Off
SD Sensor Disconnect
PS Pulse Search
LP Loss of Pulse
SH Sat High Limit Alarm
SL Sat Low Limit Alarm
PH Pulse Rate High Limit Alarm
PL Pulse Rate Low Limit Alarm
- - - No Data Available
* Alarm Parameter Being Violated
Note: A Sensor Disconnect will also cause three dashes (- - -) to be displayedin the patient data section of the printout.
Section 10: Serial Port Interface Protocol
10-5
10.5 TREND DATA PRINTOUT
The format of data displayed when a trend printout is requested is similar to thatof the real-time data. The only differences are that “TREND” is displayed in thetop row instead of the “CRC:XXXX” software verification number, and there isno “Status” column.
Readings are displayed in 5-second intervals. The values on each row are anaverage for the 5-second period.
At the end of the printout, an “Output Complete” line indicates that thetransmission was successful. If the “Outlet Complete” line is not present, ignorethe data.NPB-195 VERSION 1.0.0.1 CRC: XXXX SpO2 Limit: 30-100% PR Limit: 100-180 bpmTIME %SpO2 PR (bpm) PA22-Nov-97 14:00:05 100 120 15022-Nov-97 14:00:10 100 121 15422-Nov-97 14:00:15 100 120 150Output Complete
Figure 10-3: Trend Data Printout
10.6 NURSE CALL
A nurse call signal can be obtained by connecting to the serial port. Thisfunction is available only when the instrument is operating on AC power. Nursecall will be disabled when the unit is operating on battery power.
The remote location will be signaled anytime there is an audible alarm. If theaudible alarm has been turned off, or silenced, the nurse call function is alsoturned off.
Pin 11 on the serial port is the nurse call signal and pin 10 is ground (see Figure10-1). When there is no alarm condition, the voltage between pins 10 and 11will be -5 to -12 VDC. Whenever the monitor is in an alarm condition, theoutput between pins 10 and 11 will be +5 to +12 VDC.
11-1
SECTION 11: TECHNICAL SUPPLEMENT11-1 Introduction11-2 Oximetry Overview11-3 Circuit Analysis11-4 Functional Overview11-5 AC Input11-6 Power Supply Theory of Operation11-7 Battery11-8 User Interface PCB (UIF)11-9 Front Panel Display PCB and Controls11-10 Schematic Diagrams
11.1 INTRODUCTION
This Technical Supplement provides the reader with a discussion of oximetryprinciples and a more in-depth discussion of NPB-195 circuits. Block andschematic diagrams support a functional overview and detailed circuit analysis.The schematic diagrams are located at the end of this supplement.
11.2 OXIMETRY OVERVIEW
The NPB-195 is based on the principles of spectrophotometry and opticalplethysmography. Optical plethysmography uses light absorption technology toreproduce waveforms produced by pulsatile blood. The changes that occur inthe absorption of light due to vascular bed changes are reproduced by the pulseoximeter as plethysmographic wave forms.
Spectrophotometry uses various wavelengths of light to qualitatively measurelight absorption through given substances. Many times each second, the NPB-195 passes red and infrared light into the sensor site and determines absorption.The measurements that are taken during the arterial pulse, reflect absorption byarterial blood, nonpulsatile blood, and tissue. The measurements that areobtained between arterial pulses reflect absorption by nonpulsatile blood andtissue.
By correcting "during pulse" absorption for "between pulse" absorption, theNPB-195 determines red and infrared absorption by pulsatile arterial blood.Because oxyhemoglobin and deoxyhemoglobin differ in red and infraredabsorption, this corrected measurement can be used to determine the percent ofoxyhemoglobin in arterial blood: SpO2 is the ratio of corrected absorption ateach wavelength.
11.2.1 Functional Versus Fractional Saturation
The NPB-195 measures functional saturation, that is, oxygenated hemoglobinexpressed as a percentage of the hemoglobin that is capable of transportingoxygen. It does not detect significant levels of dyshemoglobins. In contrast,some instruments such as the IL282 Co-oximeter measure fractional saturation,that is, oxygenated hemoglobin expressed as a percentage of all measuredhemoglobin, including dyshemoglobins.
Section 11: Technical Supplement
11-2
Consequently, before comparing NPB-195 measurements with those obtained byan instrument that measures fractional saturation, measurements must beconverted as follows:
functional saturation =
fractional saturation x
100100-(% carboxyhemoglobin +%methemoglobin)
11.2.2 Measured Versus Calculated Saturation
When saturation is calculated from a blood gas measurement of the partialpressure of arterial oxygen (PaO2), the calculated value may differ from theNPB-195 SpO2 measurement. This is because the calculated saturation may nothave been corrected for the effects of variables that can shift the relationshipbetween PaO2 and saturation.
Figure 11-1 illustrates the effect that variations in pH, temperature, partialpressure of carbon dioxide (PCO2), and concentrations of 2,3-DPG and fetalhemoglobin may have on the oxyhemoglobin dissociation curve.
0
10050
Saturation(%)
pHTemperaturePCO22,3-DPG
PO2 (mmHg)
100
50
pHTemperaturePCO22,3-DPG
Fetal Hb
Figure 11-1: Oxyhemoglobin Dissociation Curve
11.3 CIRCUIT ANALYSIS
The following paragraphs discuss the operation of each of the printed circuitboards within the NPB-195 pulse oximeter. (Refer to the appropriate schematicdiagram at the end of this supplement, as necessary.)
11.4 FUNCTIONAL OVERVIEW
The functional block diagram for the NPB-195 monitor is shown in Figure 11-2.Most of the functions of the NPB-195 are performed on the UIF PCB. Functionson the UIF PCB include the SpO2 module, 331 and 196 CPUs, and Memory.Other key components of the NPB-195 are the Power Entry Module (PEM),Power Supply, and the LCD Display.
Section 11: Technical Supplement
11-3
The Display module includes the Membrane Panel and the LCD Display. TheMembrane panel contains enunciators and push buttons, allowing the user toaccess information and to select various available parameters. The LCD DisplayPCB contains the LCD that presents the patient data.
SpO2 Module
MC68331CPU
Power SupplyMembrane
Panel
LCD Display
Serial port
Alarm Speaker
BatteryCharger
DCSupply
UIF PCB
PowerEntryModule
Fuses
PatientConnection
Flash ROM64K
System RAM32K
RTC
Battery
80196CPU
ROM
RAM
Figure 11-2: NPB-195 Functional Block Diagram
11.5 AC INPUT
A selector switch on the back of the NPB-195 allows the user to connect themonitor to AC power ranging from 100 VAC to 240 VAC. The switch has twopositions, one for 100 VAC through 120 VAC and one for 210 VAC through 240VAC. Verify that the switch selection matches the AC power at your locationbefore plugging the monitor into an AC outlet.
AC power enters the NPB-195 through the Power Entry Module (PEM). A 0.5-amp fuse is placed in both the “Hot” and “Neutral” lines. These user accessiblefuses are located in a fuse drawer, which is part of the PEM on the back of theinstrument.
11.6 POWER SUPPLY PCB THEORY OF OPERATION
The NPB-195 uses an unregulated linear power supply. This power supplyprovides the DC power needed to charge the battery, run the cooling fan and topower the User Interface PCB (UIF). Electro Static Discharge (ESD) protectionis also provided by the power supply.
AC power from the PEM is passed through a step-down transformer, T2, whichhas two primary and two secondary windings. If switch SW1 on the back of themonitor is in the 120 VAC position, the primary windings are in parallel. Theprimary windings are in series if SW1 is in the 240 VAC position.
Each secondary winding is fused with a 2.0 amp fuse (F1 and F2). If a shortcircuit should occur in the DC circuitry, these fuses prevent the transformer fromoverheating. The output of the transformer varies, depending on load and input.Voltage measured between the outlet of a secondary winding and ground can befrom 6 to 20 VAC. C6 and C8 filter high frequency noise from the AC line andfrom the UIF PCB before passing through the bridge rectifier.
Section 11: Technical Supplement
11-4
Two outputs from the bridge rectifier are used in the NPB-195. The fan controlcircuit uses the negative output. The positive output is the Main DC rangingfrom 7 to 18 VDC. This positive voltage is used for the battery circuit and topower the UIF PCB.
11.6.1 Fan Control
A fan control circuit on the Power Supply PCB is used to control the temperatureinside the case of the NPB-195. The temperature sensor used in this circuit isU3. U3 turns on the cooling fan if the temperature inside the case gets aboveapproximately 31° C. The cooling fan runs on approximately 15 VDC.
Note: The fan is disabled if the unit is running on battery power.
11.6.2 Battery Circuits
Two circuits are included in this section of the Power Supply PCB. One circuitis used to charge the battery and the other circuit provides battery protection.
11.6.2.1 Charging Circuit
The power supply will charge the battery any time the NPB-195 is connected toAC power even if the monitor is not turned on. The voltage applied to thebattery is 6.8 ± 0.15 VDC and is current limited to 400 ± 80 mA.
Battery voltage is checked periodically by the processor. A signal from theprocessor turns the charging circuit off to allow this measurement to be taken. Ifthe processor determines the battery voltage is below 5.85 ± 0.1 VDC, a lowbattery alarm is declared.
11.6.2.2 Battery Protection
Two types of battery protection are provided by the power supply: protection forthe battery and protection from the battery.
SW2 is a resettable component that protects the battery. SW2 opens and turnsthe charging circuit off if the temperature of the battery rises above 50° C. If theoutput of the battery exceeds 2.0 amps, F3 opens. F3 protects the battery from ashort to ground of the battery output.
Protection from the battery is provided in the event of the battery beingconnected backwards. Components on the UIF PCB and the Power Supply blockand limit the voltage, to provide protection to circuits in the instrument.
11.7 BATTERY
A lead-acid battery is used in the NPB-195. It is rated at 6 VDC 4 amp-hours.When new and fully charged, the battery will operate the monitor for 6 hourswith no backlight or alarms. The battery can withstand 400 charge/dischargecycles. Recharging the battery to full capacity will take 14 hours in standby or18 hours if the instrument is being used.
Changeover from AC to battery power will not interrupt the normal monitoringoperation of the NPB-195. However, when the unit is running on battery power,the cooling fan, serial port, nurse call, and LCD backlight will be turned off.
Section 11: Technical Supplement
11-5
The 331 CPU on the UIF PCB monitors the charge level of the battery. If thevoltage of the battery falls below 5.85 ± 0.1 VDC, a low battery alarm isdeclared. The instrument will continue monitoring and alarming for 15 minutesthen power down. This 15-minute alarm and power-down sequence can berepeated by turning the unit back on, provided the battery voltage remains abovethe critical level.
Battery voltage is considered critical when it decreases to 5.67 ± 0.1 DCV. If theinstrument is turned on and battery voltage is at the critical level, an error code isdisplayed and the instrument will not monitor the patient. The instrument willrun for 15 minutes with the error code displayed and then power down.
Both conditions can be corrected by plugging the unit into an AC source for 14hours to allow the battery to fully recharge.
11.8 USER INTERFACE PCB (UIF)
The UIF PCB is the heart of the NPB-195. All functions except the unregulatedDC power supply, LCD display and membrane keypad reside on the UIF PCB.
11.8.1 Regulated DC Power Supply
The UIF PCB receives the Main_DC unregulated voltage of 7 to 18 VDC fromthe Power Supply or 5.8 to 6.5 VDC from the internal battery. From either ofthese signals, the regulated power supply on the UIF PCB generates +10.0,-10.0, -5.0 and +5.0 VDC.
11.8.2 Controlling Hardware
Two microprocessors reside on the UIF PCB. The CPU is an MC68331CF(331). The CPU controls the second microprocessor, an Intel 80C196KC (196).
11.8.2.1 CPU
The 331 is the main controller of the NPB-195. The 331 controls the front paneldisplay, data storage, instrument status, serial port communication, and nursecall. The 331 monitors all buttons on the user interface.
The user interface includes the front panel display and the keypad. By pressingany of the keys on the keypad, the operator can access different functions of theNPB-195. The 331 will recognize the keystroke and make the appropriatechange to the monitor. Some of the changes operators can make include theview on the LCD display, alarm limits, and alarm volume. SECTION 4: of thismanual goes into more detail about the use of the softkeys.
Patient data is stored by the NPB-195 and can be downloaded to a printerthrough the serial port provided on the back of the instrument. An in-depthdiscussion of the serial port is covered in the Section 10 of this manual.
Power to the NPB-195 is monitored by the 331, which will determine if theinstrument is running on AC, or on battery power. If the monitor is running onAC power, the 331 will periodically turn off the battery charge circuit to checkthe battery charge level.
Section 11: Technical Supplement
11-6
When the 331 sends a signal to the alarm speaker, three items are used todetermine the tone that is sent. First, pulse tones change with the %SpO2 valuebeing measured. The pulse beep tone will rise and fall with the measured%SpO2. Second, three levels of alarms, each with its own tone, can occur: High,Medium and Low priority. Third, the volume of the alarm is user adjustable.Alarm volume can be adjusted from 1 to level 10, with level 10 being the highestvolume.
When AC powers the NPB-195, the nurse call function is available. If noaudible alarms are occurring, the output from the serial port (- pin 10, + pin 11)will be from minus 3 to minus 10 VDC. When there is an audible alarm (notsilenced or disabled) the output will be positive 3 to positive 10 VDC.
11.8.2.2 196
Primary responsibilities of the 196 include controlling the SpO2 function andcommunicating data to the 331.
A pulse width modulator (PWM) function built into the 196 controls the SpO2function. PWM signals are sent to control the intensity of the LEDs in thesensor. The gain of amplifiers receiving return signals from the photodetector inthe sensor are also controlled by PWM signals.
Analog signals are received from the SpO2 circuit on the UIF PCB. An Analogto Digital (A/D) function in the 196 converts these signals to the digital valuesfor %SpO2 and heart rate. These values are then sent to the 331 to be displayedand stored.
11.8.3 Sensor Output/LED Control
The SpO2 analog circuitry provides control of the red and IR LEDs such that thereceived signals are within the dynamic range of the input amplifier. Becauseexcessive current to the LEDs will induce changes in their spectral output, it issometimes necessary to increase the received signal channel gain. To that point,the CPU controls both the current to the LEDs and the amplification in the signalchannel.
At initialization of transmission, the LEDs' intensity level is based on previousrunning conditions, and the transmission intensity is adjusted until the receivedsignals match the range of the A/D converter. If the LEDs reach maximumoutput without the necessary signal strength, the PWMs will increase the channelgain. The PWM lines will select either a change in the LED current or signalgain, but will not do both simultaneously.
The LED drive circuit switches between red and IR transmission and disablesboth for a time between transmissions in order to provide a no-transmissionreference. To prevent excessive heat build-up and prolong battery life, eachLED is on for only a small portion of the duty cycle. Also, the frequency ofswitching is well above that of motion artifact and not a harmonic of known ACtransmissions. The LED switching frequency is 1.485 kHz. The IR transmissionalone, and the red transmission alone, will each be on for about one-fifth of theduty cycle; this cycle is controlled by the 196.
Section 11: Technical Supplement
11-7
11.8.4 Input Conditioning
Input to the SpO2 analog circuit is the current output of the sensor photodiode.In order to condition the signal current, it is necessary to convert the current tovoltage.
Because the IR and red signals are absorbed differently by body tissue, theirreceived signal intensities are at different levels. Therefore, the IR and redsignals must be demodulated and then amplified separately in order to comparethem to each other. De-multiplexing is accomplished by means of two circuitsthat alternately select the IR and red signal. Two switches that are coordinatedwith the IR and red transmissions control selection of the circuits. A filter with alarge time-constant follows to smooth the signal and remove noise beforeamplification.
11.8.5 Signal Gain
The separated IR and red signals are amplified so that their DC values are withinthe range of the A/D converter. Because the received IR and red signals aretypically at different current levels, the signal gain circuits provide independentamplification for each signal as needed. The gain in these circuits is adjusted bymeans of the PWM lines from the CPU.
After the IR and red signals are amplified, they are filtered to improve thesignal-to-noise ratio and clamped to a reference voltage to prevent the combinedAC and DC signal from exceeding an acceptable input voltage from the A/Dconverter.
11.8.6 Variable Gain Circuits
The two variable gain circuits are functionally equivalent. The gain of eachcircuit is contingent upon the signal’s received level and is controlled to bringeach signal to approximately 3.5 V. Each circuit uses an amplifier and oneswitch in the triple SPDT analog-multiplexing unit.
11.8.7 AC Ranging
In order to achieve a specified level of oxygen saturation measurement and tostill use a standard-type combined CPU and A/D converter, the DC offset issubtracted from each signal. The DC offsets are subtracted by using an analogswitch to set the mean signal value to the mean of the range of the A/D converterwhenever necessary. The AC modulation is then superimposed upon that DClevel. This is also known as AC ranging.
Each AC signal is subsequently amplified such that its peak-to-peak values spanone-fifth of the range of the A/D converter. The amplified AC signals are thenfiltered to remove the residual effects of the PWM modulations and, finally, areinput to the CPU. The combined AC and DC signals for both IR and red signalsare separately input to the A/D converter.
11.8.8 Real-Time Clock (RTC)
Real time is tracked by the NPB-195. As long as battery power or AC power isavailable, the instrument will keep time. If the battery is removed, the time clockwill have to be reset.
Section 11: Technical Supplement
11-8
The LCD will display real time when trends are selected. A time stamp isprinted for each line of data on a printout. Real-time data is displayed andprinted as Day, Month, Year, Hours, Minutes, and Seconds.
11.8.9 Patient Data Storage
Patient data is stored once every 5 seconds. A maximum of 24 hours of patientdata can be stored. Up to 50 alarm limit changes can be retained. Trend datawill be retained for a minimum of 30 days.
If battery power is disconnected or depleted, patient data will be lost. Data isstored with error detection coding. If data stored in memory is corrupted, it isdiscarded.
11.9 FRONT PANEL DISPLAY PCB AND CONTROLS
11.9.1 Display PCB
The Front Panel LCD display PCB displays patient data and status of themonitor.
At power up, all indicators and pixels are illuminated to allow verification oftheir proper operation. Next, the NPB logo and the software revision level aredisplayed. After this cycle has been completed the instrument is ready to beginmonitoring.
The LCD allows the user to select among several different types of displays.Graphs, which are used for trend screens, can be displayed. Real-time patientdata can include a plethysmographic waveform and digital values for SpO2 andBPM. If a plethysmograph is not desired, the operator can select to view onlydigital data for SpO2 and BPM along with a blip bar to show pulse intensity.
11.9.2 Membrane Keypad
A membrane keypad is mounted as part of the top case. A ribbon cable from thekeypad passes through the top case and connects to the UIF PCB. Nine keysallow the operator to access different functions of the NPB-195.
These keys allow the user to select and adjust the alarm limits, cycle power tothe unit, and to silence the alarm. Alarm volume and alarm silence duration canalso be adjusted via the keypad. Pressing the softkeys can access a number ofother functions. These functions are discussed in greater detail in Section 4.
Four LEDs are also part of the membrane keypad. These LEDs indicate ACpower available, low battery, pulse search, and alarm silence.
11.10 SCHEMATIC DIAGRAMS
The following part locator diagrams and schematics are included in this section:
Figure 11-3: UIF PCB Front End Red/IR Schematic DiagramFigure 11-4: Front End LED Drive Schematic DiagramFigure 11-5: Front End Output Schematic DiagramFigure 11-6: Front End Power Supply Schematic DiagramFigure 11-7: Isolation Barrier EIA-232 Port Schematic Diagram
Section 11: Technical Supplement
11-9
Figure 11-8: CPU Core Schematic Diagram AFigure 11-9: CPU Core Schematic Diagram BFigure 11-10: MC331 CPU Core Schematic Diagram AFigure 11-11: MC331 CPU Core Schematic Diagram BFigure 11-12: Display Driver Schematic DiagramFigure 11-13: Speaker Driver Schematic DiagramFigure 11-14: Core Power Supply Schematic DiagramFigure 11-15: Power On/Off Circuit Schematic DiagramFigure 11-16: UIF PCB Parts Locator DiagramFigure 11-17: Power Supply Schematic DiagramFigure 11-18: Power Supply Parts Locator Diagram
Figure 11-3UIF PCB Front End Schematic Diagram
FRONT END RED/IR
IR CHANNEL
AD822 BYPASS
DG201S BYPASS
RED CHANNEL
TP2
I172
-5V
I171 I22
I8
U674HC00S
4
5
7
14
6
OFF/ON
0.01UC22
VREF
VREF
G_IRDC
G_REDDC
I24
I23
I21
I20
TP9
TP4
TP11
TP5
TP3
TP10
TP6
TP7
TP8
I18
I16
G_PWM2G_MUX1
I6 U12DG201S
V+
V-GND
10
5
9
11
13
4
I3
LF444CMU10
-
+
-
+
11
47
6
5
U10LF444CM
-
+
-
+
3
21
4
11
U10LF444CM
-
+
-
+
12
1314
4
11LF444CMU10
-
+
-
+
11
48
9
10
AD822U4
-
+
+
-
4
87
5
6
Z5U
C7
0.1U
1N914SCR2
133
1
R17100K
VREF
VCC
U1
CD4053S
Z1 3Z0 5
Z4
Y1 1Y0 2
Y15 XO 12
X1 13
X14
VSS8
VEE7
VCC16 INH 6
C 9B 10A 11
35
4
12
15 1213
14
8
7
16 6
91011
LF441SU7
2
36
1
5
8
7
4
+
-2
36
1
5
8
7
4
AD822U4
-
+
+
-
4
81
3
2
C200.01U
VCC
R13100K
R12100K
+10V
-5V
+10V
+10V
+10V
2.00KR6
VREF
88.7K_0.1%R9
-5V
-5V
-5V
R81.00M
+10V
-5V
R1582.5K 1N914S
CR4
133
1
-5V
VREF
82.5KR16
-5V
+10V
C24220P
Q72N3906S
2
311
3
2
VREF
+10VVREF
0.12UC25
100KR4
+10V
C160.068U
220PC15
2N3906SQ6
2
31
2
31
+10VVREF
C140.12U
R1100K
R5100K
VREF
-5V
CR11N914S
13
13
+10V
+10V
25V
3216
C10.47U
+
20V
C5622U
7343
+
-5V
+10V
C190.01U
0.01UC21
C280.068U
100KR14
-5V
0.068UC26
0.068UC18
R2100K
CR31N914S1
31
3
-5V
G_LEDDR
DG201SU12
V+
V-GND4
13
3
12
R751.1K
88.7K_0.1%R10
I2
U12DG201S
V+
V-GND
4
13
6
8
5
7
I4
SAMPIR
I5
SAMPRED
I1
I10
-5V
I11
I12
I14
PWM2
I15
3.32KR11
R33.32K
0.47UC2
3216
25V +
VREF
I17
I13
IRLED/AV
I7
I9
I19
C270.12U
0.12UC17
VREF
1000PC23
C131000P
U674HC00S
3
14
7
2
1
I173
1.00KR77
1.00KR109
I25
I26
035262
11-11
Figure 11-4Front End LED Drive Schematic Diagram
LED DRIVE
FRONT END LED DRIVE
S
L25
RSENS
RSENS
VREF
100KR24
OFF/ON
C38 22P
R26100K
CR5 1N914S
13 13
1N914SCR6
133 1
I50
I47
PHOTOI
I52
I49
I48I45
I38
I36
I30
TP19
TP18
TP17
TP14
TP12
-5V
G_PWM2
G_PWM1
DG201SU12
V+
V-GND
4
13
14
16
5
15
Z5U
C90.1U
VCC
182KR43
VCC
VCC VCC
0.022UC42
R42100K
0.1UC41
20.0KR41
C400.022U
100KR40
C390.1U
R3920.0K
511KR37
Q3
2
13
2N3904S1
3
2
R3622.1K
R3410.0K10.0
R3310.0KR32
MPSA06SQ2
2
3
11
2
3
R3140.2K
Q1MPSA06S
2
3
1
3
2
1
Q10
MPSA56S
2
3
2
31
VREF
R306.04K_0.1%
+10V
1.00MR29
AD822U5
+
-6
57
8
4
R28182K
0.047UC37
VREF
AD822U5
+
- 2
31
8
4
+10V
-5V
VREF
MPSA56S
Q9
2
31
3
2
C36390P
C350.047U
18PC34
0.01UC33
R23182K
10.0KR20
LT1013SU11
-
+
+
-2
65
4
3
U11LT1013S
-
+
+
-
1
87
6
2
VCC
2N3906S
Q82
31
3
2
14.7PC29
U2
CD4053S
Z13Z05
Z 4
Y11Y02
Y 15XO12
X113
X 14
VSS 8
VEE 7
VCC 16INH6
C9B10A1111
109
6 16
7
8
14
1312 15
21
4
53
0.1UC8
Z5U
VREF
R253.32K
I27
280KR27
R442.74K
R182.74K
10.0KR35
I33
I35
I34
I39
I32
I40
I43 I44
I37
I28
I46
R3815.8K
I31
R1910.0K
I42
I51
C30100P 100P
C31 C32100P
R2210.0K
J1
CON_DB9F
9
8
7
6
5
4
3
2
11
10
11
10
11
2
3
4
5
6
7
8
9
LEDDIS
-5V
+10V
IR/RED IR/RED
R213.32K
G_LEDDR
L26
L27
L28
L29
L30
L31
035262
11-13
Figure 11-5Front End Output Schematic Diagram
035262
DG201S BYPASS DG201S SPARES
Guard Ring
Guard Ring
I60
C471000P
I70
I54
I67
I65
IRAC
I64
I62
ZERO-L
I57
I59
I58
G_PWM1
G_MUX1
PWM1
VREF
U674HC00S
12
13
7
14
11
0.1UC50
0.47UC4
3216
25V
+
0.01UC44
0.01UC45
C480.01U
0.01UC49
G_REDDC
20V
C5722U
7343
+
C530.01U
0.01UC54
-5V
U9LMC6044S
+
-
-
+10
11
48
9
C5GUARDU13DG201S
V+
V-GND
4
13
11
9
5
10
VCC
C550.01U
VCC
VREF
0.47UC3
3216
25V
+
C520.01U
C60.015U
CK06U9LMC6044S
+
-
-
+
21
4
11
3
U13DG201S
V+
V-GND
7
5
8
6
13
4
0.01UC51
+10V
R613.32K
R5834.8K
+5.7V
-5V
+5.7V
+10V
12.1KR57
VREF
15.0KR56
VREF
+10V
+5.7V
-5V
+5.7V
3.32KR51
U3
CD4053S
Z13Z05
Z 4
Y11Y02
Y 15XO12
X113
X 14
VSS 8
VEE 7
VCC 16INH6
C9B10A11
R4815.0K
0.1UC43
-5V -5V
+10VVCC
VCC
C6GUARDU13
DG201S
V+
V-GND
15
5
16
14
13
4
DG201SU13
V+
V-GND
2
5
1
3
13
4
U9LMC6044S
+
-
-
+12
11
414
13
U9LMC6044S
+
-
-
+
11
47
6
5
74HC00SU6
8
14
7
10
9
+10V VCC VCC
G_IRDC
R533.32K
100KR52
R503.32K
3.32KR59
R62100K
3.32KR60
3.32KR47
R493.32K
R5512.1K
100KR45
R46100K
TP21
TP20
PWM0
REDAC
REDDC
I55I56
REDLED/AV
REDLED/AV
I61
I63
IRDC
I68I69
R5434.8K
I71
I72
1000PC46
I96C5
0.015UCK06
11-15
Figure 11-6Front End Power Supply Schematic Diagram
035262
CURRENT
HIGH10V47UC64
7343
+
I244
I81
CR19
MBRS130
1 22116V10UC78
+
CR7
MBRS130122
1
VDD
I85
7343
C6347U10V
+
I83
I82
RAW-5V
I80
I78
TP15
TP23
TP22
TP16
VCC
VFB
11.5KR63
U14
FB 2
GND7
6 GNDS
NFB 3
4 S/S
VC1 VIN 5
VSW 8
LT1373S
8
51
4
3
6
7
2
C61330P
36.5KR66
R7149.9
0.1UC58
Z5U
Z5U
C120.1U
U8
2 GND13 GND2
6GND37GND4
VIN8 1VOUT
78L05D
18
76
32
20V
7343
22UC69
+
R7010.0K
Q5
2
13
2N3904S2
31
Q4
2
13
2N3904S1
3
2
VREF
5%1.0R69
-5V
+5.7V
7343
22UC68
20V
+
VREF
+10V
7343
22UC67
20V
+
182R68
CR30
MBRS130
1 221
MBRS130
CR9
122 1
VCC
49.9R67
20V
C7022U
7343
+
7343
22UC66
20V
+
0.1UC59
Z5U
Z5U
C100.1U
4.99KR65
CR101N914S
133
1 0.1UC11
Z5U
5%
C621000P
R6449.9
I73
I76
I77
I79
RAW+10V
I29
I84
C6010U16V
+
T1LPE-4841
1
8
6
37
2
5
44
5
2
7 3
6
8
1
MBRS130
CR8
12 12I75
VSW
I41
20V7343
22UC84
+Z5U
C650.1U
49.9R78
TP25
I90C8322U
7343
20V+
-10V
7343
C9447U10V
+
VIN
11-17
035262
clockshigh power
SH1 BD MTG HOLE
E
4.7UC74
35V
+I192
TXDOUT
I99
I97
IGNDTP24
I87
VMINUS
VMINUS
EXCOM-SHTDWN
100M
TH
R76
1/4W
DT1600VTH
DTRLDR
TX
6N136U18
TH
7
6
8
2
3 553
2
8
6
7
DTR
CR16BAV99
21
33
BAV99CR15
21
33
CR14BAV99
21
33
22VSMCJ22CCR11
21
21
R744.02K
4.02KR73
VDD
U15
13V-
V+ 2
11T2OUT
T2DIN4
T1OUT 12
3 T1DIN
RTRI 8
R2LDR6 9R2IN
5 R1LDR
R1IN 10
ISO_GND14
7 BYP
AC1
MAX251S
1
7
14
10
596
8
3
12
4
11
2
13
1N914CR12
133 1
U164N26
45
6
12TH
451
2 6
VDD
6N136U17
TH
7
6
8
2
355 3
2
8
6
7
IBAV99CR13
21
33
U19
EN8
R1OUT9
R2OUT12
SHDN1
PWR14
D2 13
R2DIN 11R1DIN 10
GND 7
T2LDR 6T2IN5T1IN4 T1LDR 3
D1 2
MAX250S
8
912
1
1413
1110
7
654 3
2
SCHOTT 67129080T2
6
43
2
1 6
43
2
1
RXDIN
RXDLDR
NURSE-CALLTXD
RXD
TP31
TP29
I86
C721.0U20V
+
VPLUS
VPLUS
20V1.0UC73
+
I98
TP26
NCALOUT
J2
CON_DB15F
16
1
8
7
6
5
4
3
15
2
14
13
12
11
10
9
1717
9
10
11
12
13
14
2
15
3
4
5
6
7
8
1
16
RXD232
I
I88
R7210.0K
IGND
L21 600R
L22600R
L23600R
C893300P
50V
C711.0U20V
+
50V2200P
C75
C1173300P
50V
CLKDRV2
CLKDRV1
0.1U
C76Z5U
I238
I237
TXDLDR
Figure 11-7Isolation Barrier EIA-232 Port Schematic Diagram
11-19
Figure 11-8CPU Core Schematic Diagram A
035262
IS NOT AVAILABLEONLY IF ATP-SMHC49S IS USED
CPU CORE
ADDRESS LATCHING
CLINICAL SERIALDATA CONNECTOR
RAM --- E000 - FFFF
ROM --- 0000 - DFFF
ADDRESS DECODING - MEMORY MAPPING
SERIAL INTERFACE
I119
RRD-LRWR-L
I162I164
I161
I315I316
RSCI_CLK
CLK_OUT TP33
121R167
VDD
I305I304
I301
Q11
2
13
2N3904S
31
2
VDD
RAMEN-L
10MHZY2
ATP-SM
144 1
U21
74HC573S
1 OCC11
8Q 128D97Q 137D86Q 146D75Q 155D64Q 165 4D3Q 174 3D2Q 183 2D1Q 192 1D2 19
3 184 175 166 157 148 139 12
111
VDD
10V47UC116
7343
+
I163
RALE-L
I170
I107I105
U20
74HC573S
1 OCC11
8Q 128D97Q 137D86Q 146D75Q 155D64Q5 4D3Q 174 3D2Q 183 2D1Q 192 1D2
345 166789
111
I169WR-L
I167
ADDR13ADDR12ADDR11
ADDR0
I149
AD8
AD6
I126
R87 121
VREF
C820.1U
I104 I106 I101
10V47UC102
7343
+
I108
I109
RWD_RST
Y510MHZ
21
HC49S
21
VDD
121R75
C910.1U
PHOTOI
RAD8RAD9RAD10RAD11RAD12RAD13RAD14RAD15
CDRXD
REDAC
IRACRSENS
IRLED/AV
REDLED/AVZERO-L
REDDC
IRDC
22PC90
R86 121
U27
80C196KC
6 ACH0/P0.05 ACH1/P0.17 ACH2/P0.24 ACH3/P0.3
11 ACH4/P0.410 ACH5/P0.5
8 ACH6/P0.69 ACH7/P0.7
60AD059AD1
50AD1049AD1148AD1247AD13
AD14 4645AD15
58AD257AD356AD455AD554AD653AD752AD851AD9
12 ANGND
65CLKOUT
14GND136GND268GND3
24 HSI0HSI125
26HSI2/HSO427HSI3/HSO5
28HSO029HSO134HSO235HSO3
63INST
P1.01920 P1.1
P1.22122 P1.3/PWM123 P1.4/PWM2
P2.0/TXD1817 P2.1/RXD
P2.2/EXTINT1544 P2.3/T2CLK
P2.4/T2RST4239 P2.5/PWM033 P2.6/TWUP-DN
P2.7/T2CAPT38
PWR1
37 VPPVREF13
67XTAL166XTAL2
62ADV
30 BREQ31 HLDA32 HOLD
61RD
41WRH/BHE
40WRL/WR
ALE/
P1.5/P1.6/P1.7/
64 BUSWIDTH
2 EA
3 NMI
16 RESETREADY43
25
18
3833
24
43
272635342928
6423
16
32
474849
313023222120
5051525354555657585960
19
98
1011
4
657
121337
65
6667
1
683614
63
4546
4041
62
61
1715444239
U30
~RST 6
RST 5
LTC1232
VCC 8
TOL3
TD2 ST 7
PBRST1
GND4
6
5
8
3
2 7
1
4
I100
R88121
WD_RST
TP32
I92
I110
RAMEN-L AD14AD13AD12AD11AD10AD9AD8
AD15
AD7AD6AD5AD4AD3AD2AD1AD0
AD14AD13AD12AD11AD10AD9AD8AD7AD6AD5AD4AD3AD2AD1AD0
AD15
AD[15:0]
10.0KR92
ALE
VDD
RAD7RAD6RAD5RAD4RAD3RAD2RAD1RAD0
RAD15RAD7
I144I143
I142I141
I140I139I138
I137I136
I135I134
I133I132
I131I130 AD0
AD1AD2AD3AD4AD5
AD7
AD9AD10AD11AD12AD13AD14AD15I129 ADDR15
ADDR14
ADDR10ADDR9
ADDR7
ADDR5ADDR4ADDR3ADDR2ADDR1
I159I158
I157I156
I155I154
I153I152
I151I150
I148I147
I146I145
ADDR6
ADDR8
I160
RD-LALEI168
VDD
U22
74HC10S
345
6
TP28
TP27
U22
74HC10S
1213
21
I91
ROM_DIS-L
ROMEN-L
ADDR14ADDR15ADDR13
ADDR[15:0]
ADDR15ADDR14ADDR13ADDR12ADDR11ADDR10ADDR9ADDR8
ADDR6ADDR5ADDR4ADDR3ADDR2ADDR1ADDR0
ADDR7
ADDR[15:0]
ALE
J4
CON_5
5432112345
I103
I176I177I178
C810.1UZ5U
Z5U0.1UC77
C800.1UZ5U
VDD
VDD
120RP2
910111213141516
87654321
910111213141516
87654321
RP1 120
910111213141516
8765432112345678
16151413121110
9
R89221
R163221
I302
I206
I283
FERESET
TP36
RD-L
WR-L
SLAVESEL
SLAVESEL
ALE
I165
I74I89 I166
I303
R8110.0K
CDRXDCDTXD
VDD
R8010.0K
TP34RST-L
10.0KR110
VDD
I225
C9522P
R9110.0K
R82100K
L7LEDDIS
L8
L9IR/RED
RWD_RST
L11
L10PWM1
PWM2
L15
L14
CDTXD
PWM0
L16
L18
L17SAMPRED
OFF/ON
SAMPIR
221R166
SCI_CLK
50V470PC79
4700P
L6
1 2
3 443
21
VDD
196PWR
MOSI
RMOSI
11-21
035262
Figure 11-9PIC and Speaker Schematic Diagram B
STATIC RAM
EPROMU31
N195SPO2
64KX16
27C1024
2 VPP
44PWR
43 PGM
22 OE
N.C.42
12GND2GND1 34
D9 10D8 11
14D7
15D6
16D5
17D4
18D3
19D2
D15 4D14 5D13 6D12 7D11 8D10 9
20D1
21D0
3 CE
35 A9
32 A8
31 A7
30 A6
29 A5
28 A4
27 A3
26 A2
41 A15
40 A14
39 A13
38 A12
37 A11
36 A10
25 A1
24 A02425
363738394041
2627282930313235
3
2120
987654
1918171615141110
3412
42
2243
44
2
0R94
VDD
I179
10.0KR83
SRAMPWR
Z5U0.1UC86
C850.1UZ5U10V
47UC103
7343
+
U32 32KX8
A010
A19
A10A11A12A1326
1 A14
A28
A37
A46
A55
A643 A7
A8A9
CE20 14GND
O0 1112O113O215O316O417O518O619O7
OE22
28PWR
27 WE
55257S
109
261
876543
20 14
1112131516171819
22
28
27WR-L
RAMEN-L
VDD
10.0KR79
I203
I202
I193
7343
C10447U10V
+
L20
L19
VDD
ROMEN-L
AD[15:0]
AD0
AD0
AD1AD2AD3AD4AD5AD6AD7
AD9AD8AD7AD6AD5AD4AD3AD2AD1
AD15AD14AD13AD12AD11AD10
EPROMPWR
BIGROM
RD-L
RD-L
ADDR[15:0]
ADDR12ADDR11ADDR10ADDR9ADDR8ADDR7ADDR6ADDR5ADDR4ADDR3ADDR2ADDR1ADDR0
ADDR15
ADDR3
ADDR1ADDR2
ADDR10ADDR9ADDR8ADDR7ADDR6ADDR5ADDR4
ADDR14ADDR13ADDR12ADDR11
11-23
035262
Figure 11-10MC331 CPU Core Schematic Diagram A
Y3
32
.76
8K
HZ
14
EC
PS
M2
9T
41
battery backed power
From Power Supply
REAL TIME CLOCK
MC331 CPU CORE
TP30
A0A1A2A3A4A5A6A7A8
A[16:0]A16A15A14A13A12A11A10A9
RA0
C1524.7P
CR31VC1206
5.6V
12
12
47UC137
10V
+
R/WLDSACK0DSACK1
I210U45
60XTAL
64XFC
VSS96759 VSS8
VSS75140 VSS6
VSS53429 VSS4
VSS3178 VSS2
VSS15127117 VSS14
VSS13106101 VSS12
VSS119583 VSS10
VSS12
61VDDSYN
84 VDD9VDD865
63 VDD7VDD650
39 VDD5VDD428
18 VDD3VDD27
126 VDD13VDD12116
107 VDD11VDD1096
1 VDD1
52 TXD
80SIZ1
81SIZ0
45 SCK
53 RXD
79R-/W
PWMB129130 PWMA
PCLK1284 PAI
6 OC4
10 OC3OC211
12 OC1
44 MOSI
78MODCLK
43 MISO
54IPIPE-DSO55IFETCH-DSI
IC4/OC55IC313
14 IC2IC115
58FREEZE-QUOT
118FCO-/CS3
120FC2-/CS5
119FC1-/CS4
62EXTAL
99D9
100D8
102D7
103D6
104D5
105D4
108D3
109D2
91D15
92D14
93D13
94D12
97D11
98D10
110D1
111D0
66CLKOUT
A9 3027A8
A7 2625A6
A5 2423A4
A3 22
125A23-/CS10
124A22-/CS9
123A21-/CS8
122A20-/CS7
21A2
121A19-/CS6
42A18A17 41
38A16A15 37
36A14A13 35
33A12A11 32
31A10
A1 2090A0
57/TSTIME-TSC
/RMC 86
/RESET68
49 /PCS3
48 /PCS2
47 /PCS1
46 /PCS0-/SS
71 /IRQ7
72 /IRQ6
73 /IRQ5
74 /IRQ4
75 /IRQ3
76 /IRQ2
77 /IRQ1
69 /HALT
88/DSACK1/DSACK0 89
85/DS
112/CSBOOT113/BR-/CS0
56/BKPT-DSCLK
115/BGACK-/CS2
114/BG-/CS1
70 /BERR
87 /AVEC
82/AS
68331
82
87
70
114115
56
113112
85
8988
69
77767574737271
46474849
68
86
57
9020
313233353637384142121
21
122123124125
22232425262730
66
111110
989794939291
10910810510410310210099
62
119120
118
58
151413
5
5554
43
78
44
121110
6
4128
130129
79
53
45
8180
52
1
96107116126
718283950636584
61
2
8395
101106117127
817293440515967
64
60
221R153
L2
I205
L13
I235BATT_CHECK
C1290.1U0805
C1280.1U08050805
0.1UC126C123
0.1U08050805
0.1UC127C121
0.1U08050805
0.1UC120
C1240.1U08050805
0.1UC125C134
0.1U08050805
0.1UC133C135
0.1U08050805
0.1UC122
10K
RP6
1 2 3 4
8 7 6 55678
4321
I310
L3
I312
I307
I198I197
BOOTROML
RPBCSL
VDD
RESETL
R96 221
I24
2
I279
EEPENEEPCLKEEPDI
I240
I313
I228RDSPLRDL
RD0RROMLATECSL
RA1RA12 I211
I213I212RA16
R/WLR I229I227RD13I226
I230
VDD
VDD
RP16220
87654
321
DSPLRDL
RAMCSL
IPIPE0IPIPE1FREEZEBKPTL
C13822P
J15
8642
7531
CON_BDM8
1357
2468
I94
VDD
16V
C13610U
+
RP7
10K
1 2 3 4
8 7 6 55678
4321
RP11
10K
1 2 3 4
8 7 6 5
1 2 3 4
8 7 6 5
U44 8KX8
CS1
5GND
6ORG
SCLK2
SDI3
SDO 4
V+8
93C56S
8
4
32
6
5
1
VDD
10.0MR149
332KR150
I201
C1300.1UZ5U
Z5U0.1UC132
22PC140
C1410.01U
L447Z
VDD
220RP15 8
765 4
321
5678
4321
RP18220
8765 4
3211234
8765
I204
TP58
VDD
R10410.0K
VDD
10K
RP9
1 2 3 4
8 7 6 5
1 2 3 4
8 7 6 5
RP10
10K
1 2 3 4
8 7 6 5
1 2 3 4
8 7 6 5
10K
RP8
1 2 3 4
8 7 6 55678
4321
221R152
TP56
DSPLYCSL
221R105
I231
I232
I233I234
I314
I209 EEPDO
I66
I241
I239
I282
120RP12
910111213141516
87654321
910111213141516
87654321
Y132.768KHZ
14
ECPSM29T
4 1
U47TC7S00F
5
3
1
24
5
3
ROMLATECSL
VDD
I281
I102I311
I308I306
I309
I93
Z5U0.1UC139
DS1811
U46
VDD
2
RESETL 1
GND3
1
VDD
R1351.00K
Z5U0.1UC131
VDD
RESETL
U43
DS1302Z
1PWR2
GND 4
PWR1 8
7 SCLK
3 X2
6 I/ORST5
2 X12
56
3
7
8
4
1
I243
RAMPWR TP59
RTCCLKRTCDATA
RTCSEL
RTCSEL
FONTSEL I53
NURSE-CALLAC_OK-L
RTCCLK
FERESETEEPDO
VDDI
IPIPE0IPIPE1
EEPENEEPCLK
FREEZE
D15
D0
D14D13D12D11D10D9
D6D5D4D3D2D1
D8D7
D[0:15]
VDDI
RESETL
RA1RA2RA3RA4RA5RA6RA7RA8RA9RA10RA11RA12RA13RA14RA15RA16
BIULEDDRASLEDDRAC-LED
RTCSELLRROMLATECSL
R/WLR
DSLASLSIZ0SIZ1RMCL
BKPTL
RBOOTROMLRRAMCSLRDSPLCSLRDSPLRDL
PWR_BTN_RSTPWR_BTN_RSTRPBCSL
PSLEDDR
CLKOUT
VDDSYN
CTRSTINCCTRSTUPEXCOM-SHTDWNSLAVESELMOSI
SCI_CLK
TXDRXD
PWM_FREQ
FFONTSELEEPDI
RTCDATA
RTCDATA
PWM_VOL
IRQ7-LCRIT_BATT-LLOW_BATT-LBK-LT-ONBTN_PRS_L
FBATT_CHECKTURN_OFF
HALTLBERRL
VDDI
XFC
PBCSL
11-25
Figure 11-11MC331 CPU Core Schematic Diagram B
035262
11-27
U42
N195BOOT
FLASH64KX16
29C1024S
A024
A125
A1036
A1137
A1238
A1339
A1440
A1541
A226
A327
A428
A529
A630
A731
A832
A935
CE3
D021
D1 20
9D108D117D126D135D144D15
D2 19
D3 18
D4 17
D5 16
D6 15
D7 1411D810D9
12GND1GND2 34
OE22
PWR 44
WE4343
44
22
3412
1011141516171819
456789
2021
3
3532313029282726
414039383736
2524
Boot SelectJumper & Dipshunts
J14
21
J14J14
ProductionCode DebugFlash Debug
42
53
643
146
Z5U0.1UC145
D10
D4
D9D8
D11D12D13D14D15
D[15:0]D[15:0]
D[0:15]
D15D14D13D12D11D10D9D8D7D6D5
D3D2D1D0
120RP13
910111213141516
87654321
910111213141516
87654321
RD15RD14
RP14120
910111213141516
8765432112345678
161514131211109
FLASHPWR
I319I318I295
U40
74HC32S
4
56
W-RL
I278
BOOTROML A0
A4A5A6A7A8A9A10A11A12A13A14A15A16
A3A2A1
A[16:0]
A16A15A14A13A12A11A10A9A8A7A6A5A4A3A2A1
A[16:0]A[16:0]A[16:0]
I195
10.0KR148
ROMLATECSL
U22
74HC10S
81110
9
RAMCSL RAMCSL
VDD
I257 A15
R/WL R/WL
R/WL
RESETL RESETL
A0
VDD
RAMPWR
Z5U0.1UC101
10V47UC118
+
J14
CON_3X2
654321
642
531
10.0KR146
VDD
U41 128KX8
431000S
29 WE
32PWR
24 OE16GND
21D7
20D6
19D5
18D4
17D3
15D2
14D1
13D0
22 CEL30 CEH
26 A9
27 A8
5 A7
6 A6
7 A5
8 A4
9 A3
10 A2
2 A16
31 A15
3 A14
28 A13
4 A12
25 A11
23 A10
11 A1
12 A01211
2325
428
331
2
1098765
2726
3022
1314151718192021
1624
32
29
10.0KR147
VDD
C11947U10V
+
TP55
FLSHOEL
A1
I260I259I258
I256I255I254I253
I252I251I250I249
I248I247I246I245
A3A4A5A6A7A8A9A10A11A12A13A14
A2
D12D13D14
D8D9D10D11
D4D5D6D7
D2D3
I276I275I274I273
I272I271I270I269
I268I267I266I265
I262I261
D1D0
D15I263
A16I280
I264
0.95UL12
I317
EXMEMEN-L
I320I321I322
RD1RD0
RD2RD3RD4RD5RD6RD7RD8RD9RD10RD11RD12RD13
BOOTFLSHL
BOOTFLSHL
Figure 11-12Display Driver Schematic Diagram
035262
11-29
I113
Turn off control
TO DISPLAY
74HC540filter cap for
filter cap for 74HC245
MEMBRANE PANEL CONNECTOR
filter cap for 74HC32
CCFL inverter
PBCSL
CR33
VC12065.6V
12 12
SOFTKEY4
S
D[15:0]
D8D9D10D11D12D13D14D15
D[15:0]
D14D15
D13D12D11D10D9D8
AC_OK
AC_OK
AC-LED
AC-LED
ACPWRLED
74HC32SU40
12
1311
I327
U40 74HC32S
810
9
I326
121R151
U40
74HC32S
32
1
7343
C14247U10V
+
7343
C11047U10V
+
100UHL5Z5U
0.1UC97
PSLED
249R154
249R138
R137249
J9
CON_IDC20
1
1011 1213 1415 1617 1819
2
20
3 45 67 899
8765432
1917151311
1
DSPLR/WL
DSPLR/WL
RBD4
RBD3
U50
DIR
A8A7A6A5A4A3A2A1 B1
B2B3B4B5B6B7B8
G
74HC245S
2
9876543
191
1112131415161718
DSPLA0
L24
R/WL
I290
VEE
L1121R136
10.0
KR
158
ONBUTTON
ONBUTTON
J5
CON_4L_098
43211234
I323VDD
VD
D
10UC147
16V
+
Z5U0.1UC146
DSPLVDD
BK-LT-ON
BK-LT-ON
VDD
Z5U0.1UC99
I298
I300
3_3V
J8CON_FLEX16
98765432
16151413121110
11
1011 1213 1415 16
23 45 67 89
10.0KR139
100KR143
CR23
1 3
1N914S
31
CR22
1 3
1N914S
31
U48TC7S00F
5
3
42
1
Q23
3
21 2N7002S
3
21
Q222N3906S
2
31
2
31
VDD
R162
10.0
K
R161
10.0
K
10.0
KR
160
R159
10.0
K
R157
10.0
K
10.0
KR
156
I286
I288
I287
I284
HV_OUT
Q212N3906S
2
31
2
31
Q202N3906S
2
31
2
31
Q192N3906S
2
31
2
31
SOFTKEY3
ASLEDDR
BIULEDDR
PSLEDDR
SOFTKEY2SOFTKEY1BIULED
CNTRSTUPASLED
ALRMSILDOWN
PSLEDACPWRLED
A1 TH
CXA-L10
1 VDD
2 GND1
3
5GND2
44
5
3
2
1
C1000.1UZ5U
VDD
VDD
4.02KR140
R1414.02K
R1424.02K
Q12SI9953
1
78
2
I285
I289
R155
10.0
K
SOFTKEY2SOFTKEY3SOFTKEY4UPDOWNCNTRSTALRMSIL
U34
11Y8
12Y7
13Y6
14Y5
15Y4
16Y3
17Y2
18Y1
9 A8
8 A7
7 A6
6 A5
5 A4
4 A3
3 A2
2 A1
192G
11G
74HC540S
119
23456789
1817161514131211
VDD 20.0KR144
I296
I297
I299
CR25
21N4934
1
TH
2 1
CR24
21N4934
1
TH
2 1
68.1R145
8.25KR101
I221
VDD
C1060.1U
Z5U
I324
SOFTKEY1
DSPLVEE
S
121R169RBD0
RBD1R170 121
RBD2121R171
R172 121
121R173
R174 121RBD5
121R175 RBD6
121R176RBD7
BD4
BD1
BD2
BD3
BD5
BD6
BD7
BD0
BD0BD2BD4BD6
BD[7:0]
BD7BD5BD3BD1RESETL
RESETL
FONTSEL
DSPLRDL
DSPLRDL
ASLEDBIULED
CCFLPWR
121R118
A0
DSPLYCSLDSPLYCSL
CR32
VC12065.6V
122 1
I328
DSPDTACSL
DSPDTACSL
Figure 11-13Speaker Driver Schematic Diagram
035262
11-31
SPEAKER DRIVER
7343
C15147U10V
+
10V47UC150
7343
+
10V47UC149
7343
+
10V47UC148
7343
+
VDD
X9313 EPOTU24
U/
INC1
CS7 VCC
8
VL 6D2VSS
4
VW 5
VH 33
5
4
2 6
8
7
1
5.6VVC1206
CR27
122
1
Z5U0.1UC92
VDD
R98249K
R9012.1K
J13
CON_2R
2121
0.047UC87
I277
I292
VDD
Q12SI99534
6 5
3
10.0KR84
10.0KR95
I199
C961.0U
20V
+
U266GND1
7 N.C.
1 VCC
VI22
VI44VO1 5
VO2 8
TDA7052A
TH
3GND27 3
1
42
6
58
0.1UC88
6.49KR99
R10010.0K
R102100K
4.99KR93
I200
TP49U25
-
+
+
-
LT1013S
2
65
4
3
U25
-
+
+
-
LT1013S
2
67
8
1
R8518.2K
TP48
TP44
TP40
+10V+10V
-10V
-10V
RESETL
CTRSTUP
CTRSTINC
VDD
U23
TC7S00F
5
33
5
42
1
PWM_VOL
PWM_FREQ
I293
I294I196
VEE
U39
-
+
+
-
TLC27L2
4
81
3
2
1.00KR132
I95
VDD
I218
U39
-
+
+
-
TLC27L2
4
87
5
6
VDD
1.00KR133
I236
035262
Figure 11-14Core Power Supply Schematic Diagram
11-33
Critical at approx 5.68V
Low at approx 5.85V
Normally HIGH, active LOW
To Linear Power Supply
Open Collector OutputActive Low Indicator
LOW to enableVDD output
Normally HIGH, active LOW
HIGH to turn ON
CORE POWER SUPPLY
0.1UC153
R113100K
10.0KR116
100KR168
10.0MR121
10.0MR177
10.0MR124
200KR123
249KR119
200K
R107
3_3V
3_3V
TP41
TP46
10.0K
R115
20.0KR178
VDD
40.2KR120
RAMPWR
Q16 SI9
95
3
87
2
1
AC_OK
CR28
MBRS330T3
12 12
100KR114
I215
I291
R112
20.0K
MAIN_OUT
MAIN_OUT
CR17
MBRS330T3
12 12
I214U35
-
+
+
-
LM393S3
2
8
4
1
1N914SCR351
331VDD
CR34
1 3
1N914S
31
R108
6.81K
CR26VC1206
5.6V
122
1
CR21MBRS130
122
1
4.99KR128
10.0MR117
GNDVIAHG2HG1
GNDVIA
GNDTP39
U36
Requires Heatsink NPB #891196
3OUT1 IN
5
HSG1
2
CS
4
LM2940H
TH 4
1 3
2 5
3.3VTP1
50V
C113
0.1U
50V
C112
0.1U
35V1.0UC109+ C108
10U16V
+
U33LT1121CZ
OUT 1IN3
GND
2
13
2
MBRS130
CR20
122 1
TP13
I224
I222
TP43
TP42I219
TP47
I216
BATT_CHECK
CON_4L_156
J6
4321
PWR_CTRL
1N914SCR18
133 1
VDD
VDD
VDD
U35
-
+
+
-
LM393S
7
4
8
6
5
R122
150KU37LT1009S
4
5
68
R125100K
TH16V470UC107
+
332KR126
100R127
VDD
VDDTP38
I217
I220
I223
0.1U
C111
50V
Q16
SI9
95
3
4
653
35V1.0UC115+
V_REF
LOW_BATT-L
Q24
2
13
2N3904S1
3
2
U38
-
+
+
-
LM393S3
2
8
4
1
U38
-
+
+
-
LM393S5
6
8
4
7
CRIT_BATT-L
CR29
BAT54
3 13 1
AC_OK-L
BATT
MAIN_DC1
VDD
0.1UC114
035262
Figure 11-15Power On/Off Circuit Schematic Diagram
From uP
From uP
To uP
Active LOW
Active LOW
249R131
3_3V 3_3V
C1440.1UZ5U
C1430.1UZ5U
TURN_OFF
PWR_BTN_RST
CD4011BU29
7
14
12
1311
CD4011BU29
7
14
8
910
CD4011BU29 7
14
6
54
U29CD4011B
31
2
14
7
U28CD4011B
1113
12
14
7
U28CD4011B
109
8
14
7
U28CD4011B
45
6
14
7
CD4011BU28
7
14
2
13
3_3V
PWR_CTRL
3_3V
QL
3_3V 3_3V
3_3V
3_3V
3_3V
QH
BTN_PRS_L
3_3V
PWR_DLY
PWR_DLY
Z5U0.1UC93
I186
I188I190
I194
I111I182
Q14
2
13
2N3904S
31
2
Q15
2
13
2N3904S2
13
20.0KR106
TP50
100KR111
100KR129
R130100K
R165100K
C980.01U
R1641.00K
TP51
I187
TP53
I189
TP54
I191
Q13
3
21 2N7002S
3
21
20.0KR134
Q17
2
13
2N3904S
31
2
Q18
2
13
2N3904S2
13
I112
VDD
VDD
R9710.0K
10.0KR103
I174
I175
I180
I181
I183
I184
I185
10KRP5
5 4
10KRP5
7 2
ONBUTTON
RP510K
36
RP510K
18
11-35
Figure 11-16UIF PCB Parts Locator Diagram
035263
11-37
TOP SIDE BOTTOM SIDE
Figure 11-17Power Supply Schematic Diagram
035199
11-39
Battery Charge
HIGH CURRENT VIAS
ESD Protection
Power Entry
Fan Control
230V
115V
Nellcor # 891196
To Fan
Requires Heat Sink
Battery -
Main Board
Battery +
BATT_OUT
Q6
3
21 2N7002S1
2
3
TH2ASB
F3
I12
NEUTRAL
I10
MPSA56Q5
1
3
22
3
1
F2
2ASB TH
I9
I8
10.0KR14 10.0K
R3 CR7
1 3
1N914S
1 3
R1610.0K
CHG_OUT
CR6
13
1N914S
3 1
R7154K
100KR6
Q2
TH2
1
3
4
IRF9510
2
3
1
CHG_IN
R1310.0K
Q3
MPSA56
1
3
2
1
3
2
10.0KR12
U2
4LM385S
8
4
8
10.0KR11
1/2W
R101.50
TH
BATT+
TH
Q42N3904
2
1
32
1
3
MBRS330T3CR4
122
1
T2
OB24-9TH
15
1312
108
63
1
10
12
15
13
8
63
1
FAC-
FAC+
MAIN_DCMAIN_DC
AC-
AC+
0.01UC8
DT1600V TH
I3
W522GA_BLK
18GA_BRNW2
22GA_ORN
W6
W9
22GA_RED
22GA_WHT
W7
W118GA _GRN/YEL
E
BATT_CHK
FAN_CTRL
0.1UC10
100MTH
R2
1/4W
I2
TP1
1/2W
R1390K
TH
LINE
NEUT_IN
LINE_IN
EPS2PC3
SW1
TH
6
54
3 2
11
23
4 5
6
SW2MTS50BTH
NC
T1
E3490ATH
429 7
2 479
E
LM358U1
-
+
+
-
4
81
3
2
0.01UC6
J1
CON_2L
21
TP2GND
250V4700P
C2
TH
C1220P250VTH
C3
250VTH
220P
THQ12N3904
2
1
33
1
2
I1
GBU8BBR1
TH
4 1
3
2
4 1
3
2
CR522V
SMCJ22C21
21
1N4702CR1
TH15V
21
21C5
15000U35VTH
+
BATT_CHK
499R4
1.00KR8
10.0KR22
U3
TH
3 GND
1 VIN2VOUT
LM35D
31
2
1.00KR9
C9
TH
100U35V
+
CR222VSMCJ22C2
112
FAN_CTRL
10.0KR17
C4100P
C70.1U
0.1U
C11
R2010.0K
1/4W
49.9
TH
R24
TH
1.00KR5
1/2W
LM358U1
-
+
+
-6
57
8
4
R2510.0M
R2173.2K
R191.00K
10.0KR23
49.9KR15
18GA_BLUW3
W8
22GA_BLK
22GA_REDW4
I5
I6
E
I7
VREF
TH2ASB
F1I11
MAIN_DC
I4
035200
Figure 11-18Power Supply Parts Locator Diagram
11-41
"+"
"-"
"GND"
"N"
"L"
NE
LLC
OR
PU
RIT
AN
BE
NN
ET
TN
PB
-190
LP
S T
OP
SID
E
12-1
SECTION 12: INDEX
BBattery
Replacement, 2-1Battery Replacement, 6-5
CChecks
Functional, 2-1Safety, 2-1
Circuit Analysis, 11-2Cleaning, 2-1Codes, Error, 5-7
DDescription, NPB-195, 1-1Disassembly, 6-1
Alarm Speaker, 6-13Cooling Fan, 6-9Display PCB, 6-10Monitor, 6-3Power Entry Module, 6-7Power Supply, 6-8UIF PCB, 6-11
EError Codes, 5-7
FFactory Default Settings, 4-1Front Panel, 1-2Functional Checks, 2-1Fuse Replacement, 6-2
IInstallation
Alarm Speaker, 6-13Cooling Fan, 6-9Display PCB, 6-11Power Entry Module, 6-7Power Supply, 6-8UIF PCB, 6-12
INSTAT, 4-6
MMaintenance, Routine, 2-1Monaul Overview, 1-1
NNPB-195 Desciption, 1-1Nurse Call, 10-5
OOximetry Overview, 11-1
PPacking for Shipment, 8-1Parts, Spare, 7-1Performance Tests, 3-1
Alarm Limit Ranges, 3-3Alarm Silence, 3-5Alarm Volume, 3-7Alarms, 3-5Battery Charge, 3-2Battery Operation, 3-8Dynamic Operating Range, 3-7Hardware, 3-5LED Excitation, 3-8Nurse Call, 3-8Operation with a Patient, 3-9Power-On Defaults, 3-3Power-On Self-Test, 3-2Power-Up, 3-2Pulse Tone Volume, 3-7Software, 3-5Using a Pulse Oximeter Tester, 3-5
Performance Verification, 3-1Power-On Self-Test, 1-4Power-On Settings, 4-1Printout
Trend Data, 10-5Printout, Real-Time, 10-2
RReal-Time Printout, 10-2Rear Panel, 1-4Reassembly
Monitor, 6-4Repairs
Who Should Do, 5-1Replacement Level Support, 5-1Replacement Parts
Obtaining, 5-1Routine Maintenance, 2-1
SSafety Checks, 2-1Safety Tests, 3-9
Earth Leakage Current, 3-10Electrical Leakage, 3-10
Section 11: Technical Supplement
12-2
Enclosure Leakage Current, 3-10Ground Integrity, 3-9Patient Applied Risk Current, 3-11Patient Isolation Risk Current, 3-12
SaturationCalculated, 11-2Fractional, 11-1Functional, 11-1Measured, 11-2
Serial PortConnecting To, 10-1Enabling, 10-1
Serial Port Interface Protocol, 10-1Service Functions, 4-2
Accessing, 4-2Softkeys
ALARMS, 4-7DOWNLD, 4-7ERRLOG, 4-5EXIT, 4-3INSTAT, 4-6NEXT, 4-3PARAM, 4-3PRINT, 4-4RESET, 4-4
SAVE, 4-4SEL, 4-7TREND, 4-5
Spare Parts, 7-1Specifications, 9-1
Default, 9-3Electrical, 9-1Environmental, 9-2General, 9-1Performance, 9-3Physical, 9-2
TTrend Data Printout, 10-5Trend Printout, 4-5Troubleshooting, 5-1
Alarms, 5-4Buttons, 5-4Display, 5-4Guide, 5-2Operational Performance, 5-5Power Problems, 5-3Serial Port, 5-6
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