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In the interest of user-safety the oven should be restored to its origin

condition and only parts identical to those specified should be use

WARNING TO SERVICE PERSONNEL: Microwave ovens cotain circuitry capable of producing very high voltage ancurrent, contact with following parts may result in a severpossibly fatal, electrical shock. (High Voltage Capacitor, HigVoltage Power Transformer, Magnetron, High Voltage Recfier Assembly, High Voltage Harness etc..)

TABLE OF CONTENTSPage

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TOAVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY ...................INSIDE FRONT COVERBEFORE SERVICING ...................................................................................................... INSIDE FRONT COVERWARNING TO SERVICE PERSONNEL ................................................................................................................ 1MICROWAVE MEASUREMENT PROCEDURE ...................................................................................................2FOREWORD AND WARNING ...............................................................................................................................3PRODUCT SPECIFICATIONS .............................................................................................................................. 4GENERAL INFORMATION...................................................................................................................................4OPERATION ..........................................................................................................................................................6TROUBLESHOOTING GUIDE ............................................................................................................................ 10TEST PROCEDURE ............................................................................................................................................ 12TOUCH CONTROL PANEL .................................................................................................................................20COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE ................................................................25PICTORIAL DIAGRAM ........................................................................................................................................ 32

POWER UNIT CIRCUIT ...................................................................................................................................... 33CPU UNIT CIRCUIT ............................................................................................................................................ 34PRINTED WIRING BOARD .................................................................................................................................36PARTS LIST ........................................................................................................................................................37PACKING AND ACCESSORIES .........................................................................................................................39

S7017R630DPW

R-630DKR-630DWR-630DS

MICROWAVE OVEN

MODELS

SERVICE MANUAL

SHARP CORPORATIONThis document has been published to be used for aftesales service only.The contents are subject to change without notice.

BreakfastBar

SensorC ooking

More fromyourMicrowave

Vegetables

Popcorn

LinchontheRun

SuperDefrost

CompuDefrost

OneD ishDinners

Beveragecenter Frozen

Foods

MainEntrees

KitchenTimer/Clock

SensorReheat

BakedPotatoes

CustomHelp

PowerLevel

STOPClear

STARTTouchon

MinutePLus

1 2 3 4 5

6 7 8 9 0

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PRECAUTIONS TO BE OBSERVED BEFORE ANDDURING SERVICING TO AVOID POSSIBLEEXPOSURE TO EXCESSIVE MICROWAVE

ENERGY(a) Do not operate or allow the oven to be operated with the door open.(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other

microwave source, and make repairs as necessary: (1) interlock operation, (2) proper door closing, (3)seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges andlatches, (5) evidence of dropping or abuse.

(c) Before turning on microwave power for any service test or inspection within the microwave generatingcompartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,integrity, and connections.

(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwavegeneration and transmission systems shall be repaired, replaced, or adjusted by procedures describedin this manual before the oven is released to the owner.

(e) A microwave leakage check to verify compliance with the Federal Performance Standard should beperformed on each oven prior to release to the owner.

BEFORE SERVICING

Before servicing an operative unit, perform a microwave emission check as per the MicrowaveMeasurement Procedure outlined in this service manual.

If microwave emissions level is in excess of the specified limit, contact SHARP ELECTRONICSCORPORATION immediately @1-800-237-4277.

If the unit operates with the door open, service person should 1) tell the user not to operate the ovenand 2) contact SHARP ELECTRONICS CORPORATION and Food and Drug Administration's

Center for Devices and Radiological Health immediately.

Service personnel should inform SHARP ELECTRONICS CORPORATION of any certified unit foundwith emissions in excess of 4mW/cm2. The owner of the unit should be instructed not to use the unituntil the oven has been brought into compliance.


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WARNING TO SERVICE PERSONNEL

Microwave ovens contain circuitry capable of pro-ducing very high voltage and current, contact withfollowing parts may result in a severe, possiblyfatal, electrical shock.

(Example)High Voltage Capacitor, High Voltage Power Trans-former, Magnetron, High Voltage Rectifier Assem-bly, High Voltage Harness etc..

Read the Service Manual carefully and follow allinstructions.

Before Servicing

1. Disconnect the power supply cord , and thenremove outer case.

2. Open the door and block it open.3. Discharge high voltage capacitor.

WARNING:RISK OF ELECTRIC SHOCK.

DISCHARGE THE HIGH-VOLTAGE

CAPACITOR BEFORE SERVICING.

The high-voltage capacitor remains charged about 60seconds after the oven has been switched off. Wait for 60

seconds and then short-circuit the connection of the high-voltage capacitor (that is the connecting lead of the high-voltage rectifier) against the chassis with the use of aninsulated screwdriver.

Whenever troubleshooting is performed the power supplymust be disconnected. It may, in some cases, be necessaryto connect the power supply after the outer case has beenremoved, in this event,1. Disconnect the power supply cord, and then remove

outer case.2. Open the door and block it open.3. Discharge high voltage capacitor.

4. Disconnect the leads to the primary of the powertransformer.

5. Ensure that the leads remain isolated from othercomponents and oven chassis by using insulation tape.

6. After that procedure, reconnect the power supply cord.

When the testing is completed,

1. Disconnect the power supply cord, and then removouter case.2. Open the door and block it open.3. Discharge high voltage capacitor.4. Reconnect the leads to the primary of the pow

transformer.5. Reinstall the outer case (cabinet).6. Reconnect the power supply cord after the outer case

installed.7. Run the oven and check all functions.

After repairing

1. Reconnect all leads removed from components durin

testing.2. Reinstall the outer case (cabinet).3. Reconnect the power supply cord after the outer case

installed.4. Run the oven and check all functions.

Microwave ovens should not be run empty. To test for thpresence of microwave energy within a cavity, place a cuof cold water on the oven turntable, close the door and sthe power to HIGH and set the microwave timer for two (minutes. When the two minutes has elapsed (timer at zercarefully check that the water is now hot. If the watremains cold, carry out Before Servicingprocedure and r

examine the connections to the component being tested

When all service work is completed and the oven is fulassembled, the microwave power output should be checkeand a microwave leakage test should be carried out.

Don't Touch !

Danger High Voltage


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MICROWAVE MEASUREMENT PROCEDURE

A. Requirements:

1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave ovenshould not exceed 1mW/cm2at any point 5cm or more from the external surface of the oven, measured prior to acquisitionby a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2at any point 5cm or more from the externalsurface of the oven.

2) Safety interlock switches Primary interlock relay and door sensing switch shall prevent microwave radiation emission inexcess of the requirement as above mentioned, secondary interlock switch shall prevent microwave radiation emissionin excess of 5 mW/cm2at any point 5cm or more from the external surface of the oven.

B. Preparation for testing:Before beginning the actual measurement of leakage, proceed as follows:

1) Make sure that the actual instrument is operating normally as specified in its instruction booklet.

Important:Survey instruments that comply with the requirement for instrumentation as prescribed by the performance standard formicrowave ovens, 21 CFR 1030.10(c)(3)(i), must be used for testing.

2) Place the oven tray in the oven cavity.

3) Place the load of 27515 ml (9.8 oz) of tap water initially at 205C (68F) in the center of the oven cavity.The water container shall be a low form of 600 ml (20 oz) beaker with an inside diameter of approx. 8.5 cm (3-1/2 in.)and made of an electrically nonconductive material such as glass or plastic.The placing of this standard load in the oven is important not only to protect the oven, but also to insure that any leakageis measured accurately.

4) Set the cooking control on Full Power Cooking Mode.5) Close the door and select a cook cycle of several minutes. If the water begins to boil before the survey is completed,

replace it with 275 ml of cool water.

C. Leakage test:

Closed-door leakage test (microwave measurement)1) Grasp the probe of the survey instrument and hold it perpendicular to the gap between the door and the body of the oven.

2) Move the probe slowly, not faster than 1 in./sec. (2.5 cm/sec.) along the gap, watching for the maximum indication onthe meter.

3) Check for leakage at the door screen, sheet metal seams and other accessible positions where the continuity of the metalhas been breached (eg., around the switches, indicator, and vents).While testing for leakage around the door pull the door away from the front of the oven as far as is permitted by the closedlatch assembly.

4) Measure carefully at the point of highest leakage and make sure that the highest leakage is no greater than 4mW/cm2,and that the secondary interlock switch does turn the oven OFF before any door movement.

NOTE: After servicing, record data on service invoice and microwave leakage report.


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SHARP ELECTRONICS CORPORATION

SHARP PLAZA, MAHWAH,NEW JERSEY 07430-2135

SERVICE MANUAL

MICROWAVE OVEN

R-630DK/ R-630DW/ R-630DS

FOREWORD

This Manual has been prepared to provide Sharp Electronics Corp.Service Personnel with Operation and Service Information for theSHARP MICROWAVE OVEN, R-630DK, R-630DW, R-630DS.

It is recommended that service personnel carefully study the entiretext of this manual so that they will be qualified to render satisfactorycustomer service.

Check the interlock switches and the door seal carefully. Specialattention should be given to avoid electrical shock and microwave

radiation hazard.

WARNING

Never operate the oven until the following points are ensured.

(A) The door is tightly closed.

(B) The door brackets and hinges are not defective.

(C) The door packing is not damaged.

(D) The door is not deformed or warped.

(E) There is no other visible damage with the oven.

Servicing and repair work must be carried out only by trained service

personnel.

DANGER

Certain initial parts are intentionally not grounded and presenta risk of electrical shock only during servicing. Servicepersonnel - Do not contact the following parts while theappliance is energized;

High Voltage Capacitor, Power Transformer, Magnetron, HighVoltage Rectifier Assembly, High Voltage Harness;If provided, Vent Hood, Fan assembly, Cooling Fan Motor.

All the parts marked * on parts list are used at voltages more than250V.

Removal of the outer wrap gives access to voltage above 250V.

All the parts marked on parts list may cause undue microwaveexposure, by themselves, or when they are damaged, loosenedor removed.

PRODUCT DESCRIPTION

GENERAL INFORMATION

OPERATION

TROUBLESHOOTING GUIDE ANDTEST PROCEDURE

TOUCH CONTROL PANEL

COMPONENT REPLACEMENTAND ADJUSTMENT PROCEDURE

WIRING DIAGRAM

PARTS LIST


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ITEM DESCRIPTION

Power Requirements 120 Volts / 14 Amperes60 HertzSingle phase, 3 wire grounded

Power Output 1100 watts (IEC TEST PROCEDURE)Operating frequency of 2450MHz

Case Dimensions Width 19-1/2"Height 14"

Depth 20-5/8"

Cooking Cavity Dimensions Width 17-3/4"Height 8-1/4"

1.4 Cubic Feet Depth 17"

Control Complement Touch Control SystemClock ( 1:00 - 12:59 )Timer (0 - 99 min. 99 seconds)

Microwave Power for Variable Cooking

Repetition Rate;

P-HI ..................................................Full power throughout the cooking timeP-90 .................................................................... approx. 90% of Full PowerP-80 .................................................................... approx. 80% of Full PowerP-70 .................................................................... approx. 70% of Full PowerP-60 .................................................................... approx. 60% of Full PowerP-50 .................................................................... approx. 50% of Full PowerP-40 .................................................................... approx. 40% of Full PowerP-30 .................................................................... approx. 30% of Full PowerP-20 .................................................................... approx. 20% of Full PowerP-10 .................................................................... approx. 10% of Full PowerP-0 .................................................... No power throughout the cooking time

Breakfast Bar pad, Lunch on the Run pad, One Dish Dinners padSuper Defrost pad, Compu Defrost pad, Beverage Center padSensor Cooking pads, Custom Help pad, Kitchen Timer/Clock padNumber selection pads, Power Level pad, Minute Plus padSTOP/Clear pad, START/Touch On pad

Oven Cavity Light Yes

Safety Standard UL Listed FCC Authorized

DHHS Rules, CFR, Title 21, Chapter 1, Subchapter J

SPECIFICATION

GENERAL INFORMATION

GROUNDING INSTRUCTIONS

This oven is equipped with a three prong grounding plug. It must be plugged into a wall receptacle that is properly installedand grounded in accordance with the National Electrical Code and local codes and ordinances.In the event of an electrical short circuit, grounding reduces the risk of electric shock by providing an escape wire for theelectric current.

WARNING: Improper use of the grounding plug can result in a risk of electric shock.

Electrical RequirementsThe electrical requirements are a 120 volt 60 Hz, AC only,15 or 20 amp. fused electrical supply. It is recommended that a separate circuit serving only this appliance be provided. Wheninstalling this appliance, observe all applicable codes and ordinances.A short power-supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord.


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Where a two-pronged wall-receptacle is encountered, it is the personalresponsibility and obligation of the customer to contact a qualifiedelectrician and have it replaced with a properly grounded three-prongedwall receptacle or have a grounding adapter properly grounded andpolarized. If the extension cord must be used, it should be a 3-wire, 15amp. or higher rated cord. Do not drape over a countertop or table whereit can be pulled on by children or tripped over accidentally.

CAUTION: DO NOT UNDER ANY CIRCUMSTANCES CUT OR RE-

MOVE THE ROUND GROUNDING PRONG FROM THISPLUG.

3-Pronged Plug GroundedReceptacle Box

Grounding Pin

3-Pronged Receptacle

OVEN DIAGRAM

1. Door handlePull to open door.

2. Auto-Touch control panel3. Display: 99 minutes, 99 seconds4. Oven door with see-through window5. Safety door latches

The oven will not operate unless the

door is securely closed.6. Door hinges7. Door seals and sealing surface8. Turntable motor shaft9. Removable turntable support

Carefully place the turntable supportin the center of the oven floor.

10. Removable turntablePlace the turntable on the turntablesupport cecurely. The turntable willrotate clockwise or counterclockwise.Only remove for cleaning.

11. Ventilation openings (Rear)12.Oven light

It will light when oven is operating ordoor is opened.

13. Wave guide cover: DO NOT REMOVE.

NOTE:The directed features are disabled after three minutes when the oven is not in use. These features arautomatically enabled when the door is opened and closed or the STOP/ CLEAR pad is pressed.

TOUCH CONTROL PANEL

BreakfastBar

Sensor CookingMore from your Microwave

Vegetables

PopcornLinch onthe Run

SuperDefrost

CompuDefrost

One DishDinners

Beveragecenter

FrozenFoods

MainEntrees

KitchenTimer/Clock

SensorReheatBakedPotatoes CustomHelpPowerLevel

STOPClear

STARTTouch on

MinutePLus1 2 3 4 5

6 7 8 9 0

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SensorCooking

MorefromyourMicrowave

Vegetables

Popcorn

LinchontheR un

SuperDefrost

CompuDefrost

OneDishDinners

Beveragecenter Frozen

Foods

MainEntrees

KitchenTimer/Clock

SensorReheat

BakedPotatoes

CustomHelp

PowerLevel

STOPClear

STARTTouchon

MinutePLus

1 2 3 4 5

6 7 8 9 0


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OPERATION

DESCRIPTION OF OPERATING SEQUENCE

The following is a description of component functions duringoven operation.

OFF CONDITION

Closing the door activates the door sensing switch andsecondary interlock switch. (In this condition, the monitorswitch contacts are opened.)When oven is plugged in, 120 volts A.C. is supplied to thecontrol unit (Figure O-1).1. The display will show "SHARP SIMPLY THE BEST

PRESS CLEAR AND PRESS CLOCK".To set anyprogram or set the clock, you must first touch the STOP/CLEAR pad. The display will clear, and " : " will appear.

COOKING CONDITION

Program desired cooking time by touching the NUMBERpads. Program the power level by touching the POWER

LEVEL pad and then a Number pad.When the START pad is touched, the following operationsoccur:1. The contacts of relays are closed and components

connected to the relays are turned on as follows.(For details, refer to Figure O-2)

RELAY CONNECTED COMPONENTS

RY-1 oven lamp/turntable motor/fan motor

RY-2 power transformer

2. 120 volts A.C. is supplied to the primary winding of thepower transformer and is converted to about 3.3 voltsA.C. output on the filament winding, and approximately2400 volts A.C. on the high voltage winding.

3. The filament winding voltage heats the magnetronfilament and the H.V. winding voltage is sent to a voltagedoubler circuit.

4. The microwave energy produced by the magnetron ischannelled through the waveguide into the cavity feed-box, and then into the cavity where the food is placed tobe cooked.

5. Upon completion of the cooking time, the powertransformer, oven lamp, etc. are turned off, and thegeneration of microwave energy is stopped. The oven

will revert to the OFF condition.6. When the door is opened during a cook cycle, themonitor switch, door sensing switch, secondary interlockswitch, relay (RY1) and primary interlock relay areactivated with the following results. The circuits to theturntable motor, the cooling fan motor, and the highvoltage components are de-energized, the oven lampremains on, and the digital read-out displays the time stillremaining in the cook cycle when the door was opened.

7. The monitor switch electrically monitors the operation ofthe secondary interlock switch and primary interlockrelay and is mechanically associated with the door sothat it will function in the following sequence.

(1) When the door opens from the closed position, the primaryinterlock relay (RY2) and secondary interlock switch open

their contacts. And contacts of the relay (RY1) remainsclosed. Then the monitor switch contacts close.

(2) When the door is closed from the open position, themonitor switch contacts open first. Then the contacts ofthe secondary interlock switch and door sensing switchclose. And contacts of the relay (RY1) open.

If the secondary interlock switch and primary interlock relay(RY2) fail with the contacts closed when the door is opened,the closing of the monitor switch contacts will form a shortcircuit through the monitor fuse, secondary interlock switch,relay (RY1) and primary interlock relay (RY2), causing themonitor fuse to blow.

POWER LEVEL 0 PERCENT TO 90 PERCENTCOOKING

When Variable Cooking Power is programmed, the 120volts A.C. is supplied to the power transformer intermittentlythrough the contacts of relay (RY-2) which is operated bythe control unit within a 32 second time base. Microwavepower operation is as follows:

VARI-MODE ON TIME OFF TIME

100 PERCENT 32 sec. 0 sec.





50 PERCENT 18 sec. 14 sec.40 PERCENT 16 sec. 16 sec.





Note: The ON/OFF time ratio does not correspond withthe percentage of microwave power, becauseapprox. 2 seconds are needed for heating of themagnetron filament.

SENSOR COOKING CONDITION

Using the SENSOR function, the food is cooked withoutfiguring time, power level or quantity. When the oven sensesenough steam from the food, it relays the information to itsmicroprocessor which will calculate the remaining cookingtime and power level needed for best results. When the foodis cooked, water vapor is developed. The sensor sensesthe vapor and its resistance increases gradually. When theresistance reaches the value set according to the menu,supplementary cooking is started. The time of supplemen-tary cooking is determined by experiment with each foodcategory and inputted into the LSI.


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An example of how sensor works: (POTATOES)

1. Potates at room temperature. Vapor is emitted veryslowly.

2. Heat Potates. Moisture and humidity is emitted rapidly.You can smell the aroma as it cooks.

3. Sensor detects moisture and humidity and calculatescooking time and variable power.

Cooking Sequence.1. Operate the oven in sensor cooking mode by referring to

the operation manual.

NOTE: The oven should not be operated on SENSORimmediately after plugging in the unit. Wait twominutes before cooking on SENSOR.

2. The coil of shut-off relay (RY-1) is energized, the turntablemotor, oven lamp and cooling fan motor are turned on,but the power transformer is not turned on.

3. After about 16 seconds, the cook relay (RY-2) isenergized. The power transformer is turned on,microwave energy is produced and first stage is started.The 16 seconds is the cooling time required to removeany vapor from the oven cavity and sensor.

NOTE: During this first stage, do not open the door or touchSTOP/CLEAR pad.

4. When the sensor detects the vapor emitted from thefood, the display switches over to the remaining cookingtime and the timer counts down to zero.At this time, the door may be opened to stir, turn, orseason food.

5. When the timer reaches zero, an audible signal sounds.The shut-off relay and cook relay are de-energized andthe power transformer, oven lamp, etc. are turned off.

6. Opening the door or touching the STOP/CLEAR pad, thetime of day will reappear on the display and the oven willrevert to an OFF condition.

MICROWAVE

MICROWAVE

AH SENSOR


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Figure O-1. Oven Schematic-Off Condition

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. CLOCK APPEARS ON DISPLAY

SCHEMATIC

NOTE: CONDITION OF OVEN

1. DOOR CLOSED

2. COOKING TIME PROGRAMMED

3. VARIABLE COOKING CONTROL "P-HI" (100%)

4. "START" PAD TOUCHED

Figure O-2. Oven Schematic-Cooking Condition

120V AC60 Hz

OVENLAMP

TURN-TABLEMOTOR

FANMOTOR

POWERTRANSFORMER

MONITORSWITCH

RECTIFIERMAGNETRON

SECONDARYINTERLOCKSWITCH

TTMOL FM

MONITORFUSE 20A

A1

A2

N.O.

COM.COM.

N.O.

DOORSENSINGSWITCH

(RY-1) (RY-2)

CONTROL UNIT

PRIMARYINTERLOCKRELAY

THERMALCUT-OUT (OVEN)

THERMALCUT-OUT (MG.)

GRN

F3

F1

F2

AHSENSOR

B2 B1CAPACITOR

0.94F

AC2200V

OVENLAMP

TURN-TABLEMOTOR

FANMOTOR

POWERTRANSFORMER

MONITORSWITCH

RECTIFIER


TTMOL FM

N.O..

N.O.

DOORSENSINGSWITCH

B2 B1

(RY-1) (RY-2)

CONTROL UNIT

PRIMARYINTERLOCKRELAY

120V AC60 Hz

GRN

MONITORFUSE 20A

THERMALCUT-OUT (OVEN)

THERMALCUT-OUT (MG.)

COM.

CAPACITOR

0.94F

AC2200V

A1

A2

COM

F3

F1

F2

AHSENSOR

MAGNETRON


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DESCRIPTION AND FUNCTION OF COMPONENTS

DOOR OPEN MECHANISM

The door is opened by pulling the door. Refer to the FigureD-1.

Figure D-1. Door Open Mechanism

DOOR SENSING AND SECONDARY INTERLOCKSWITCHES

The secondary interlock switch is mounted in the lowerposition of the latch hook and the door sensing switch in theprimary interlock system is mounted in the upper position ofthe latch hook. They are activated by the latch heads on thedoor. When the door is opened, the switches interrupt thepower to all high voltage components. A cook cycle cannottake place until the door is firmly closed thereby activatingboth interlock switches. The primary interlock system con-sists of the door sensing switch and primary interlock relaylocated on the control circuit board.

MONITOR SWITCH

The monitor switch is activated (the contacts opened) by thelatch head on the door while the door is closed. The switchis intended to render the oven inoperative, by means ofblowing the monitor fuse, when the contacts of the primaryinterlock relay (RY2) and secondary interlock switch fail toopen when the door is opened.

Functions:

1. When the door is opened, the monitor switch contactclose (to the ON condition) due to their being normallyclosed. At this time the primary interlock relay (RY2) and

secondary interlock switch are in the OFF condition(contacts open) due to their being normally open contactswitches.

2. As the door goes to a closed position, the monitor switchcontacts are first opened and then the door sensingswitch and the secondary interlock switch contacts close.(On opening the door, each of these switches operateinversely.)

3. If the door is opened, and the primary interlock relay(RY2) and secondary interlock switch contacts fail toopen, the monitor fuse blows simultaneously with closingof the monitor switch contacts.

CAUTION: BEFORE REPLACING A BLOWN MONITOFUSE TEST THE DOOR SENSING SWITCPRIMARY INTERLOCK RELAY (RY2), RELA(RY1), SECONDARY INTERLOCK SWITCAND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE").

NOTE: MONITOR FUSE AND MONITOR SWITCH ARREPLACED AS AN ASSEMBLY.

TURNTABLE MOTOR

The turntable motor rotates the turntable located on thbottom of the oven cavity, so that the foods on the turntabcook evenly during cooking. The turntable may turn in eithdirection.

COOLING FAN MOTOR

The cooling fan motor drives a blade which draws externcool air. This cool air is directed through the air vane

surrounding the magnetron and cools the magnetron. Thair is channelled through the oven cavity to remove steaand vapors given off from the heating foods. It is theexhausted through the exhausting air vents at the ovecavity.

MONITOR FUSE

1. The monitor fuse blows when the contacts (COM-NO) the primary interlock relay (RY2) and secondary interlocswitch remain closed with the oven door open and whethe monitor switch closes.

2. If the wire harness or electrical components are shocircuited, this monitor fuse blows to prevent an electr

shock or fire hazard.

OVEN THERMAL CUT-OUT

The thermal cut-out, located on the top of the oven cavity,designed to prevent damage to the oven by fire. If the fooload is overcooked, by either error in cook time or defect the control unit, the thermal cut-out will open.Under normal operation, the oven thermal cut-out remainclosed. However, when abnormally high temperatures areached within the oven cavity, the oven thermal cut-out wopen at 257F(125C), causing the oven to shut down.

MAGNETRON THERMAL CUT-OUT

The thermal cut-out located near the magnetron is designeto prevent damage to the magnetron if an over heatecondition develops in the tube due to cooling fan failurobstructed air guide, dirty or blocked air intake, etc.Under normal operation, the thermal cut-out remains closeHowever, when abnormally high temperatures are reachewithin the magnetron, the thermal cut-out will open 257F(125C) causing the oven to shut down.

Latch Hook

Door SensingSwitch

Door

SecondaryInterlock Switch

Monitor Switch

LatchHeads


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TROUBLESHOOTING GUIDE

Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected.

When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Manyof the possible causes of trouble will require that a specific test be performed. These tests are given a procedure letter whichwill be found in the "Test Procedure "section.

IMPORTANT: If the oven becomes inoperative because of a blown monitor fuse, check the monitor switch, relay (RY1)primary interlock relay (RY2), door sensing switch and secondary interlock switch before replacing themonitor fuse. If the monitor fuse is replaced, the monitor switch must also be replaced. Use part FFS-BA023WRK0 as an assembly.

IMPORTANT: Whenever troubleshooting is performed with the power supply cord disconnected. It may, in some cases,be necessary to connect the power supply cord after the outer case has been removed, in this event,1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge high voltage capacitor.4. Disconnect the leads to the primary of the power transformer.5. Ensure that the leads remain isolated from other components and oven chassis by using insulation tape.6. After that procedure, reconnect the power supply cord.

When the testing is completed1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge high voltage capacitor.4. Reconnect all leads removed from components during testing.5. Reinstall the outer case (cabinet).6. Reconnect the power supply cord after the outer case is installed.7. Run the oven and check all functions.


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Home fuse or circuit breaker blowswhen power cord is plugged into wallreceptacle

Monitor fuse blows when power cordis plugged into wall receptacle.

All letters and indicators do not ap-pear in display when power cord isfirst plugged into wall outlet.

Display does not operate properlywhen STOP/CLEAR key is touched.(Buzzer should sound and ":" or timeof day should appear in display.)

Oven lamp does not light when dooris opened.

Oven lamp does not go out whendoor is closed.

Oven lamp lights but fan motor andturntable motor do not operate.

Oven does not go into cook cyclewhen START pad is touched

Oven seems to be operating but littleor no heat is produced in oven load.(Food incompletely cooked or not

cooked at all at end of cook cycle.)

Oven goes into a cook cycle but ex-tremely uneven heating is producedin oven load (food).

Oven does not cook properly whenprogrammed for Cooking Power P-50 mode. (Operates properly on Cook-ing Power P-HI (100%) mode.)

Oven goes into COMPU DEFROSTbut food is not defrosted well.

AH sensor does not end during sen-sor cooking condition. (Oven doesnot shut off after a cup of water isboiling by sensor cooking.)

Oven stops at 16 sec. after setting.

OFF

CONDITION

PROBLEMCONDITION SHORTINPOWERCORD

SHORTOROPEN

ED

WIRING

MAGNETRON

POWERTRANSFORMER

H.V.RECTIFIERA

SSEMBLY

HIGHVOLTAGEC

APACITOR

THERMALCUT-OUT

PRIMARYINTERL

OCKSYSTEM


MONITORSWITCH

MONITORFUSE

OVENLAMPORS

OCKET

COOLINGFANMO

TOR

TURNTABLEMOT

OR

CONTROLUNIT

WRONGOPERAT

ION

LOWV

OLTAGE

DIRTYOVENCAV

ITY

KEYUNIT

RELAY(RY1)

COMPUDEFROST

FOILPATTERNONPWB.

A H S E N S O RP

OSS

IBLECAUSE

AND

DEFECTIVEPARTS

TEST PROCEDURE RE RE A B C D E F F G H RERE CK I CKCKCK J K L M N

SENSOR

COOKINGCONDITION

CK = Check / RE = Replace


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B POWER TRANSFORMER TEST

A MAGNETRON ASSEMBLY TEST

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge the high voltage capacitor.4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check

across the magnetron filament leads should indicate less than 1 ohm.5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads

and chassis ground. This test should indicate an infinite resistance. If there is little or no resistancethe magnetron is grounded and must be replaced.

6. Reconnect all leads removed from components during testing.7. Reinstall the outer case (cabinet).8. Reconnect the power supply cord after the outer case is installed.9. Run the oven and check all functions.

MICROWAVE OUTPUT POWER

The following test procedure should be carried out with the microwave oven in a fully assembledcondition (outer case fitted).

HIGH VOLTAGES ARE PRESENT DURING THE COOK CYCLE, SO EXTREME CAUTION SHOULDBE OBSERVED.

Power output of the magnetron can be measured by performing a water temperature rise test. This testshould only be used if above tests do not indicate a faulty magnetron and there is no defect in the followingcomponents or wiring: silicon rectifier, high voltage capacitor and power transformer. This test will requirea 16 ounce (453cc) measuring cup and an accurate mercury thermometer or thermocouple typetemperature tester. For accurate results, the following procedure must be followed carefully:

1. Fill the measuring cup with 16 oz. (453cc) of tap water and measure the temperature of the water witha thermometer or thermocouple temperature tester. Stir the thermometer or thermocouple throughthe water until the temperature stabilizes. Record the temperature of the water.

2. Place the cup of water in the oven. Operate oven at POWER P-HI(HIGH) selecting more than 60seconds cook time. Allow the water to heat for 60 seconds, measuring with a stop watch, second handof a watch or the digital read-out countdown.

3. Remove the cup from the oven and again measure the temperature, making sure to stir thethermometer or thermocouple through the water until the maximum temperature is recorded.

4. Subtract the cold water temperature from the hot water temperature. The normal result should be 32.1to 59.7F(17.9 to 33.2C) rise in temperature. If the water temperatures are accurately measured andtested for the required time period the test results will indicate if the magnetron tube has low poweroutput (low rise in water temperature) which would extend cooking time or high power output (highrise in water temperature) which would reduce cooking time. Because cooking time can be adjustedto compensate for power output, the magnetron tube assembly should be replaced only if the watertemperature rise test indicates a power output well beyond the normal limits. The test is only accurateif the power supply line voltage is 120 volts and the oven cavity is clean.

TEST PROCEDURES

PROCEDURELETTER

COMPONENT TEST

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge the high voltage capacitor.4. Disconnect the primary input terminals and measure the resistance of the transformer with an

ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance ofthe primary coil should be less than 1 ohm and the resistance of the high voltage coil should beapproximately 75 ohms; the resistance of the filament coil should be less than 1 ohm.



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(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TMEASURE THE FILAMENT AND HIGH VOLTAGE.)

TEST PROCEDURES

PROCEDURELETTER

COMPONENT TEST

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge the high voltage capacitor.4. Isolate the rectifier from the circuit. Using the highest ohm scale of the meter, read the resistanc

across the terminals and observe, reverse the leads to the rectifier terminals and observe metereading. If a short is indicated in both directions, or if an infinite resistance is read in both directionthe rectifier is probably defective and should be replaced.


NOTE: Be sure to use an ohmmeter that will supply a forward bias voltage of more than 6.3 volt

C HIGH VOLTAGE RECTIFIER TEST

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. Discharge the high voltage capacitor.4. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input lead

and check for short or open between the terminals using an ohmmeter.Checking with a high ohm scale, if the high voltage capacitor is normal, the meter will indicacontinuity for a short time and should indicate an open circuit once the capacitor is charged. If thabove is not the case, check the capacitor with an ohmmeter to see if it is shorted between either the terminals and case. If it is shorted, replace the capacitor.

5. Reconnect all leads removed from components during testing.6. Reinstall the outer case (cabinet).

7. Reconnect the power supply cord after the outer case is installed.8. Run the oven and check all functions.

D HIGH VOLTAGE CAPACITOR TEST

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. To discharge the high voltage capacitor, wait for 60 seconds.4. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless th

temperature of the thermal cut-out reaches approximately 257F(125C).An open thermal cut-out indicates overheating of the oven, exchange the oven thermal cut-out ancheck inside of oven cavity and for improper setting of cooking time or operation of control unit. Checfor restricted air flow through the vent holes of the oven cavity, especially the cooling fan and air guid


MAGNETRON THERMAL CUT-OUT TEST

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. To discharge the high voltage capacitor, wait for 60 seconds.4. A continuity check across the thermal cut-out terminals should indicate a closed circuit unless th

temperature of the magnetron reaches approximately 257F(125C). An open thermal cut-oindicates overheating of the magnetron. Check for restricted air flow to the magnetron, especially thcooling fan air guide.

E OVEN THERMAL CUT-OUT TEST


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TEST PROCEDURES

PROCEDURELETTER

COMPONENT TEST

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. To discharge the high voltage capacitor, wait for 60 seconds.4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminal

of the switch. The meter should indicate an open circuit with the door open and a closed circuit withthe door closed. If improper operation is indicated, replace the secondary interlock switch.



PRIMARY INTERLOCK SYSTEM TEST

DOOR SENSING SWITCH1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. To discharge the high voltage capacitor, wait for 60 seconds.

4. Isolate the switch and connect the ohmmeter to the common (COM.) and normally open (NO) terminalof the switch. The meter should indicate an open circuit with the door open and a closed circuit withthe door closed. If improper operation is indicated, replace the door sensing switch.



NOTE: If the door sensing switch contacts fail in the open position and the door is closed, the coolingfan, turntable and oven light will be activated by RY1.

PRIMARY INTERLOCK RELAY (RY2)

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. To discharge the high voltage capacitor, wait for 60 seconds.4. Disconnect two (2) wire leads from the male tab terminals of the Primary Interlock Relay. Check the

state of the relay contacts using a ohmmeter. The relay contacts should be open. If the relay contactsare closed, replace the circuit board entirely or the relay itself.

5. Reconnect all leads removed from components during testing.

6. Reinstall the outer case (cabinet).7. Reconnect the power supply cord after the outer case is installed.8. Run the oven and check all functions.

F SECONDARY INTERLOCK SWITCH TEST


CAUTION: IF THE THERMAL CUT-OUT INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE,REPLACE THERMAL CUT-OUT.

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. To discharge the high voltage capacitor, wait for 60 seconds.4. Before performing this test, make sure that the secondary interlock switch and the primary interlock

relay are operating properly, according to the above Switch Test Procedure. Disconnect the wire leadfrom the monitor switch (COM) terminal. Check the monitor switch operation by using the ohmmeteras follows. When the door is open, the meter should indicate a closed circuit. When the monitor switch

G MONITOR SWITCH TEST


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TEST PROCEDURES

PROCEDURELETTER

COMPONENT TEST

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.

3. To discharge the high voltage capacitor, wait for 60 seconds.4. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondainterlock switch and monitor switch according to the "TEST PROCEDURE" for those switches beforeplacing the blown monitor fuse.

CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE, TEST THE PRIMARY INTERLOCRELAY, SECONDARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND MONITOSWITCH FOR PROPER OPERATION.

If the monitor fuse is blown by improper switch operation, the monitor fuse and monitor switch mu

be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA023WRK0, eveif the monitor switch operates normally. The monitor fuse and monitor switch assembly is compriseof a 20 ampere fuse and switch.


actuator is pushed by a screw driver through the lower latch hole on the front plate of the oven caviwith the door opened (in this condition the plunger of the monitor switch is pushed in), the meter shouindicate an open circuit. If improper operation is indicated, the switch may be defective. After testinthe monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check thcontinuity of the monitor circuit.

5. Reconnect all leads removed fromcomponents during testing.

6. Reinstall the outer case (cabinet).7. Reconnect the power supply cord

after the outer case is installed.8. Run the oven and check all

functions.

H BLOWN MONITOR FUSE TEST

The control unit consists of circuits including semiconductors such as LSI, ICs, etc. Therefore, unlikconventional microwave ovens, proper maintenance cannot be performed with only a voltmeter an

ohmmeter. In this service manual, the control panel unit is divided into three units, CPU Unit, Key Unit anPower Unit, and troubleshooting by unit replacement is described according to the symptoms indicateBefore testing,

1) Disconnect the power supply cord, and then remove outer case.2) Open the door and block it open.

3) To discharge high voltage capacitor, wait for 60 seconds.4) Disconnect the leads to the primary of the power transformer.5) Ensure that these leads remain isolated from other components and oven chassis by usin

insulation tape.1. Key Unit.

The following symptoms indicate a defective key unit.a) When touching the pads, a certain pad produces no signal at all.b) When touching a number pad, two figures or more are displayed.c) When touching the pads, sometimes a pad produces no signal.If the Key unit is defective, replace the door screen assembly.

2. Control UnitThe following symptoms indicate a defective control unit. Before replacing the control unit, perforthe Key unit test (Procedure J) to determine if control unit is faulty.

I CONTROL TEST

SecondaryInterlock Switch

Monitor Switch

Screw Driver

Ohmmeter

RED

WHT


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K RELAY TEST

TEST PROCEDURES

PROCEDURELETTER

COMPONENT TEST

J KEY UNIT TEST

2-1 In connection with pads.a) When touching the pads, a certain group of pads do not produce a signal.b) When touching the pads, no pads produce a signal.

2-2 In connection with indicatorsa) At a certain digit, all or some segments do not light up.

b) At a certain digit, brightness is low.c) Only one indicator does not light.d) The corresponding segments of all digits do not light up; or they continue to light up.e) Wrong figure appears.f) A certain group of indicators do not light up.g) The figure of all digits flicker.

2-3 Other possible problems caused by defective control unit.a) Buzzer does not sound or continues to sound.b) Clock does not operate properly.c) Cooking is not possible.

When testing and/or replacement is completed,1) Disconnect the power supply cord, and then remove outer case.2) To discharge the high voltage capacitor, wait for 60 seconds.

3) Re-install all removed parts.4) Reconnect all leads removed from components during testing.5) Re-install the outer case (cabinet).6) Reconnect the power supply cord after the outer case is installed.7) Run the oven and check all functions.

1. Disconnect the power supply cord, and then remove outer case.2. To discharge the high voltage capacitor, wait for 60 seconds.3. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable

is making good contact, verify that the door sensing switch (stop switch) operates properly; that is thecontacts are closed when the door is closed and open when the door is open. If the door sensing switch(stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control unit and

make sure the door sensing switch is closed (either close the door or short the door sensing switchconnecter). Use the Key unit matrix indicated on the control panel schematic and place a jumper wirebetween the pins that correspond to the STOP/CLEAR pad making momentary contact. If the control

unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit doesnot respond, it is faulty and must be replaced. If a specific pad does not respond, the above methodmay be used (after clearing the control unit) to determine if the control unit or key pad is at fault.

4. Reconnect all leads removed from components during testing.5. Re-install the outer case

(cabinet).6. Reconnect the power

supply cord after the outer

case is installed.7. Run the oven and checkall functions.

1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3. To discharge the high voltage capacitor, wait for 60 seconds.4. Disconnect the leads to the primary of the power transformer.5. Ensure that these leads remain isolated from other components and oven chassis by using insulation

tape.

G12G11G10

G9

G 8 G 7 G 6 G 5 G 4 G 3 G 2 G 1

1 2 3 4 5

6 7 8 9 0

SuperDefrost

CompuDefrost

Lunch onthe Run

BeverageCenter

MainEntrees

FrozenFoods

One DishDinners

BreakfastBar Popcorn

PowerLevel

MinutePlus

CustomHlep

SensorReheat

STOP

ClearBaked

Potatoes

Vegetables Kitchen

Timer/Clock

START

Touch On


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TEST PROCEDURES

PROCEDURELETTER

COMPONENT TEST

6. After that procedure, re-connect the power supply cord.7. Remove the outer case and check voltage between Pin No. 1 of the 2 pin connector (A) and the norm

open terminal of the relay RY1 on the control unit with an A.C. voltmeter.The meter should indicate 120 volts, if not check oven circuit.

RY1 and RY2 Relay TestThese relays are operated by D.C. voltageCheck voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.

DC. voltage indicated..........................Defective relay.DC. voltage not indicated ....................Check diode which is connected to the relay coil. If diod

is good, control unit is defective.

RELAY SYMBOL OPERATIONAL VOLTAGE CONNECTED COMPONENTS

RY1 Approx. 23.4V D.C. Oven lamp / Turntable motor / Cooling fan motor

RY2 Approx. 22.5V D.C. Power transformer

8. Disconnect the power supply cord, and then remove outer case.9. Open the door and block it open.

10. To discharge the high voltage capacitor. wait for 60 seconds.

11. Reconnect all leads removed from components during testing.12. Re-install the outer case (cabinet).13. Reconnect the power supply cord after the outer case is installed.14. Run the oven and check all function.

WARNING : The oven should be fully assembled before following procedure.(1) Place one cup of water in the center of the turntable tray in the oven cavity.(2) Close the door, touch the " COMPU DEFROST " pad and then touch the Number pad "2".(3) Touch the Number pad " 5 " and then touch the " START " pad.(4) The oven is in Compu Defrost cooking condition.(5) The oven will operate as follows. (in case of Steak/Chops 0.5lb)

WEIGHT 1ST STAGE 2ND STAGE

LEVEL TIME LEVEL TIME

0.5lb 60% 30sec. 40% 30sec.

(6) If improper operation is indicated, the control unit is probably defective and should be checked.

L COMPU DEFROST TEST

To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary othe PWB, this foil pattern acts as a fuse.1. Foil pattern check and repairs.

1) Disconnect the power supply cord, and then remove outer case.2) Open the door and block it open.3) To discharge the high voltage capacitor, wait for 60 seconds.4) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

1 Only pattern at "a" is broken. *Insert jumper wire J1 and solder.

2 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d".

5) Make a visual inspection of the varistor. Check for burned damage and examine the transformwith a tester for the presence of layer short-circuit (check the primary coil resistance which approximately 21210%). If any abnormal condition is detected, replace the defective part

M FOIL PATTERN ON THE PRINTED WIRING BOARD TEST


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TEST PROCEDURES

PROCEDURELETTER

COMPONENT TEST

6) Reconnect all leads removed from componentsduring testing.

7) Re-install the outer case (cabinet).8) Reconnect the power supply cord after the outer

case is installed.9) Run the oven and check all functions.

2. Follow the troubleshooting guide given below, if the indicator does not light up after above check andrepairs are finished.1) Disconnect the power supply cord, and then remove outer case.2) Open the door and block it open.3) To discharge the high voltage capacitor, wait for 60 seconds.4) Disconnect the leads to the primary of the power transformer.

5) Ensure that these leads remain isolated from other components and oven chassis by usinginsulation tape.6) After that procedure, re-connect the power supply cord.7) Follow the troubleshooting guide given below for repair.

STEPS OCCURRENCE CAUSE OR CORRECTION

The rated AC voltage is not present between

1 Pin No. 1 of the 2-pin connector (A) and the Check supply voltage and oven power cord.

normal open terminal of the relay RY1.

2The rated AC voltage is present at primary Low voltage transformer or secondary circuit defective.

side of low voltage transformer. Check and repair.

8) Disconnect the power supply cord, and then remove outer case.9) Open the door and block it open.

10) To discharge the high voltage capacitor, wait for 60 seconds.11) Reconnect all leads removed from components during testing.12) Re-install the outer case (cabinet).13) Reconnect the power supply cord after the outer case is installed.14) Run the oven and check all functions.

RY1

RY2

T1

(J1)

VRS1

1

2

P

ACa

d

c

b

Checking the initial sensor cooking conditionWARNING :The oven should be fully assembled before following procedure.(1) The oven should be plugged in at least two minutes before sensor cooking.(2) Room temperature should not exceed 95F (35C).(3) The unit should not be installed in any area where heat and steam are generated. The unit should

not be installed, for example, next to a conventional surface unit. Refer to the INSTALLATIONINSTRUCTIONS of the operation manual.(4) Exhaust vents are provided on the back of the unit for proper cooling and air flow in the cavity. To

permit adequate ventilation, be sure to install so as not to block these vents. There should be somespace for air circulation.

(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisturewith a dry cloth or paper towel.

(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would beat refrigerator temperature and canned soup at room temperature.

(7) Avoid using aerosol sprays or cleaning solvents near the oven while using Sensor settings. Thesensor will detect the vapor given of by the spray and turn off before food is properly cooked.

(8) If the sensor has not detected the vapor of the food, ERROR will appear and the oven will shut off.

Water load cooking test

N AH SENSOR TEST


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TEST PROCEDURES

PROCEDURELETTER

COMPONENT TEST

WARNING :The oven should be fully assembled before following procedure.Make sure the oven has been plugged in at least two minutes before checking sensor cook operatioThe cabinet should be installed and screws tightened.(1) Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.(2) Place the container on the center of tray in the oven cavity.

(3) Close the door.(4) Touch Lunch on the Run pad and then touch number 2 pad, and touch the start pad. Now, the oven

in the sensor cooking condition and "HOT DOGS IN BUNS SENSOR COOK" will appear in the displa(5) The oven will operate for the first 16 seconds, without generating microwave energy.NOTE: ERROR will appear if the door is opened or STOP/CLEAR pad is touched during first stage

sensor cooking.(6) After approximately 16 seconds, microwave energy is produced, and the display should start to cou

down the remaining cooking time and oven should turn off after water is boiling (bubbling).If the oven does not turn off, replace the AH sensor or check the control unit, refer to explanation below

TESTING METHOD FOR AH SENSOR AND/OR CONTROL UNIT

To determine if the sensor is defective, the simplest method is to replace it with a new replacemesensor.

(1) Disconnect the power supply cord, and then remove outer case.(2) Open the door and block it open.(3) Discharge high voltage capacitor.(4) Remove the AH sensor.(5) Install the new AH sensor.(6) Reconnect all leads removed from components during testing.(7) Re-install the outer case (cabinet).(8) Reconnect the power supply cord after the outer case is installed.(9) Reconnect the oven to the power supply and check the sensor cook operation as follows:

9-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.9-2. Place the container on the center of tray in the oven cavity.9-3. Close the door.9-4. Touch Lunch on the Run pad and then touch number 2 pad, and touch the Start pad.9-5. The control panel is in automatic Sensor operation.9-6. The display will start to count down the remaining cooking time, and the oven will turn o

automatically after the water is boiling (bubbling).If new sensor dose not operate properly, the problem is with the control unit, and refer to explanatiobelow.

CHECKING CONTROL UNIT

(1) Disconnect the power supply cord, and then remove outer case.(2) Open the door and block it open.(3) Discharge high voltage capacitor.(4) Disconnect the sensor connector that is mounted to control panel.(5) Then connect the dummy resistor circuit (see fig. below) to the sensor connector of control pane(6) Disconnect the leads to the primary of the power transformer.

(7) Ensure that these leads remain isolated from other components and oven chassis by using insulatiotape.

(8) After that procedure, re-connect the power supply cord.(9) Check the sensor cook operation proceed as follows:

9-1. Touch Lunch on the Run pad and then touch number 2 pad, and touch the Start pad.9-2. The control panel is in the sensor cooking operation.

9-3. After approximately 20 seconds, push plunger of select switch for more than 3 seconds. Thcondition is same as judgement by AH sensor.

9-4. After approximately 3 seconds, the display shows X X . X X which is the remaining cookintime, and the display counts down.

If the above is not the case, the control unit is probably defective.If the above is indicated, the AH sensor is probably defective.

(10) Disconnect the power supply cord, and then remove outer case.


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TOUCH CONTROL PANEL ASSEMBLY

OUTLINE OF TOUCH CONTROL PANEL

The touch control section consists of the following units.

(1) Key Unit(2) Control Unit (The Control Unit consists of Power Unit

and CPU Unit).

The principal functions of these units and the signals com-municated among them are explained below.

Key UnitThe key unit is composed of a matrix, signals generated inthe LSI are sent to the key unit through P10-P17.When a key pad is touched, a signal is completed throughthe key unit and passed back to the LSI through AN8 - AN11to perform the function that was requested.

Control Unit

Control unit consists of LSI, ACL circuit, indicator circuit,power source circuit, relay circuit, buzzer circuit, synchro-

nizing signal circuit, absolute humidity sensor circuit andback light circuit.

1) ACLThis circuit generates a signal which resets the LSI to theinitial state when power is supplied.

2) Indicator Circuit

This circuit consists of 40 segments and 16 commonelectrodes using a Liquid Crystal Display. The LiquidCrystal Display (LCD) is drived by LCD driver IC3.

3) Power Source Circuit

This circuit generates voltages necessary in the controlunit from the AC line voltage.In addition, the synchronizing signal is available in order

to compose a basic standard time in the clock circuit.Symbol Voltage Application

VC -5V LSI(IC1)

4) Relay Circuit

A circuit to drive the magnetron, fan motor, turntablemotor and light the oven lamp.

5) Buzzer CircuitThe buzzer is responsive to signals from the LSI to emitaudible sounds (key touch sound and completion sound).

6) Synchronizing Signal Circuit

The power source synchronizing signal is available in

order to compose a basic standard time in the clockcircuit.It accompanies a very small error because it works oncommercial frequency.

7) Door Sensing Switch

A switch to tell the LSI if the door is open or closed.

8) Back Light Circuit

A circuit to drive the back light (Light emitting diodesLD10- LD19).

9) Absolute Humidity Sensor CircuitThis circuit detects moisture of the cooking food to allow

its automatic cooking.

(11) Open the door and block it open.(12) Discharge high voltage capacitor.(13) Disconnect the dummy resistor circuit from the sensor connector of control panel.(14) Carry out necessary repair.(15) Reconnect all leads removed from components during testing and repairing.

(16) Re-install the outer case (cabinet).(17) Reconnect the power supply cord after the outer case is installed. Run the oven and check all

functions.(18) Carry out "Water load cooking test" again and ensure that the oven works properly.

R1, R2 : 221% 1/2W

R3 : 4.3k5% 1/4WR4 : 1M5% 1/4W

Sensor Dummy Resistor Circuit

TEST PROCEDURES

PROCEDURELETTER

COMPONENT TEST

Plunger

NC

NO

COM

COMNO

NCR3 R4

R1

R2

1

2

3

F-1

F-2

F-3

To connector (F)on Control Unit.

CONNECTOR


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1 AN10 IN Signal coming from touch key.When either G10 line on key matrix is touched, a corresponding signal out of P10 - P17will be input into ANI0. When no key is touched, the signal is held at "H" level.

2 AN11 IN Signal similar to AN10.

When either G9 line on key matrix is touched, a corresponding signal will be input into AN11

3 AVSS IN Connected to VC.

4 P10 OUT Key strobe signal.Signal applied to touch-key section. A pulse signal is input to AN8 - AN11 terminal whileone of G8 line keys on key matrix is touched.








12 X1 IN Connected to GND.

13 X2 OUT Terminal not used.

14 VSS IN Power source voltage : -5.0V.The power source voltage to drive LSI is input to VSS terminal. Connected to VC.

15 OSC2 OUT Internal clock oscillation output.Output to control oscillation input of OSC1.

16 OSC1 IN Internal clock oscillation frequency control input setting.The internal clock frequency is set by inserting the ceramic filter oscillation circuit withrespect to OSC2 terminal.

17 TEST IN Connected to VC.

18 RES IN Auto clear terminal.Signal is input to reset the LSI to the initial state when power is applied. Temporarily set "L

level the moment power is applied, at this time the LSI is reset. Thereafter set at "H" level

19 P20 OUT Signal to sound buzzer (2.0 kHz).

A: key touch sound.

B: Completion sound.

20-22 P21-P23 OUT Terminal not used.

Pin No. Signal I/O Description

LSI(IXA054DR)

The I/O signal of the LSI(IXA054DR) is detailed in the following table.

A

B

0.1 sec.

2.0 sec.

H : GND

L : -5V

H : GND

L : -5V


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23 P24 OUT Oven lamp, fan motor and turntable motor driving signalTo turn on and off shut off relay (RY1). Thesquare waveform voltage is delivered to theRY1 driving circuit and RY2 control circuit.

24 P25 OUT Magnetron high-voltage circuit driving signal.

To turn on and off the cook relay (RY2). Thesignals holds "L" level during microwave cook-ing and "H" level while not cooking. In othercooking modes (variable cooking) the signalturns to "H" level and "L" level in repetitionaccording to the power level.

(ON and OFF times for other power level.)

25 P26 OUT Back light (Light emitting diodes) circuit driving signal.

26 P27 OUT Terminal not used.


30-34 P33-P37 OUT Used for initial balancing of the bridge circuit (absolute humidity sensor).

35 CVCC IN Power source voltage: GND(0V).The power source voltage to drive LSI is input to CVCC terminal. Connected to GND.

36 VSS IN Power source voltage: -5.0V.The power source voltage to the LSI is input to VSS terminal. Connected to VC.

37-38 V3-V2 IN Terminal not used.

39-40 V1-V0 IN Power source voltage input terminal.Standard voltage for LCD. Connected to GND.

41 VCC IN Power source voltage : GND(0V).The power source voltage to drive LSI is input to VCC terminal.

42-45 COM4-COM1 OUT Terminal not used.

46-65SEG1-SEG20

OUT Terminal not used.66-69 P74-P77 OUT Data output terminal to LCD driver IC3.

70-77 P80-P87 OUT Data output terminal to LCD driver IC3.

78-79 P90-P91 OUT Data output terminal to LCD driver IC3.

80-85 SEG35-SEG40 OUT Terminal not used.


89 IRQ0 IN Signal synchronized with commercial power source frequency.

This is the basic timing for time processing of LSI.

90 AVCC IN A/D converter power source voltage : GND(0V).The power source voltage to drive the A/D converter. Connected to GND.

91 AN0 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is ananalog input terminal from the AH sensor circuit, and connected to the A/D converter builtinto the LSI.

92 AN1 IN AH sensor input.This input is an analog input terminal from the AH sensor circuit, and connected to theA/D converter built into the LSI.

93 AN2 IN To input signal which communicates the door open/close information to LSI.Door close "H" level signal (0V). Door open "L" level signal (-5V).

94 AN3 IN Connected to VC through the pull-down resistor.


16.7 msec.

During cooking

H : GND

L : -5V

100PERCENT

70PERCENT

H : GND

L : -5V

H : GND

L : -5V

ON

ON

OFF

OFF OFF

24 sec.

8 sec.

16.7 msec.

H : GND

L : -5V


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95-98 AN4-AN7 IN Terminal to change cooking input according to the Model.By using the A/D converter contained in the LSI, DC voltage in accordance with the Modein operation is applied to set up its cooking constant.

99 AN8 IN Signal similar to ANI7.When either G12 line on key matrix is touched, a corresponding signal will be input into AN8

100 AN9 IN Signal similar to ANI7.When either G12 line on key matrix is touched, a corresponding signal will be input into AN9

(1) Structure of Absolute Humidity Sensor

The absolute humidity sensor includes two thermistorsas shown in the illustration. One thermistor is housed inthe closed vessel filled with dry air while another in theopen vessel. Each sensor is provided with the protectivecover made of metal mesh to be protected from theexternal airflow.

(2) Operational Principle of Absolute Humidity Sensor

The figure below shows the basic structure of an absolutehumidity sensor. A bridge circuit is formed by twothermistors and two resistors (R1 and R2).The output of the bridge circuit is to be amplified by theoperational amplifier.Each thermistor is supplied with a current to keep itheated at about 150C (302F), the resultant heat isdissipated in the air and if the two thermistors are placedin different humidity conditions they show differentdegrees of heat conductivity leading to a potentialdifference between them causing an output voltage fromthe bridge circuit, the intensity of which is increased asthe absolute humidity of the air increases. Since theoutput is very minute, it is amplified by the operationalamplifier.

(3) Detector Circuit of Absolute Humidity Sensor Circuit

This detector circuit is used to detect the output voltageof the absolute humidity circuit to allow the LSI to controlsensor cooking of the unit. When the unit is set in thesensor cooking mode, 16 seconds clearing cycle occurs

ABSOLUTE HUMIDITY SENSOR CIRCUIT


than the detector circuit starts to function and the Lobserves the initial voltage available at its AN1 terminaWith this voltage given, the switches SW1 to SW5 in thLSI are turned on in such a way as to change thresistance values in parallel with R107 ~ R111 of ICChanging the resistance values results in that there the same potential at both F-3 terminal of the absolu

humidity sensor and AN0 terminal of the LSI. The voltagof AN1 terminal will indicate about -2.5V. This initbalancing is set up about 16 seconds after the unit is pin the Sensor Cooking mode. As the sensor cookinproceeds, the food is heated to generate moisture bwhich the resistance balance of the bridge circuit deviated to increase the voltage available at AN1 termin

of the LSI.Then the LSI observes that voltage at AN1 terminal ancompares it with its initial value, and when the comparisorate reaches the preset value (fixed for each menu to bcooked), the LSI causes the unit to stop sensor cookinthereafter, the unit goes in the next operatioautomatically.When the LSI starts to detect the initial voltage at ANterminal 16 seconds after the unit has been put in thSensor Cooking mode, if it is not possible to balance thbridge circuit due to disconnection of the absolute humidisensor, ERROR will appear on the display and thcooking is stopped.

1) Absolute humidity sensor circuit

ventilation opening for sensingSensing part(Open vessel)

Sensing part(Closed vessel)

Thermistors

C

S

R3

R1

R2

+

Operationalamplifier

Outputvoltage

S : Thermistor open vesselC : Thermistor closed vessel

2Absolute humidity (g/m )

Outputvoltage

Absolute humidity vs,

output voltage characteristic

SW1

SW2

SW3

SW4

SW5

P33

P34

P35P36

P37

LSI(IC1)

AN0

AN1

620k

300k

150k

75k

37.4k

30

33

34

91

92

32

31

47k

47k

IC215k

0.0

1u

F

0.1

uF

0.0

1u

F

+

VA : -15V VA : -15V

R50

330

C 50

C 51

C 93

C 92

S

F-2 1.8k

F-1

F-3

C

3.57k

3.32k

VC : -5V

0 . 1

u F

C. Thermistor inclosed vessel

S. Thermistor in open vessel

R98

R99

R52

R51

360kR54

R53

R112 R95

D90

R100

R101

R102

R97


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1. Precautions for Handling Electronic Components

This unit uses CMOS LSI in the integral part of thecircuits. When handling these parts, the followingprecautions should be strictly followed. CMOS LSI haveextremely high impedance at its input and outputterminals. For this reason, it is easily influenced by thesurrounding high voltage power source, static electricity

charge in clothes, etc. and sometimes it is not fullyprotected by the built-in protection circuit.In order to protect CMOS LSI.

1) When storing and transporting, thoroughly wrap them inaluminium foil. Also wrap all PW boards containing themin aluminium foil.

2) When soldering, ground the technician as shown in thefigure and use grounded soldering iron and work table.

2. Shape of Electronic Component

3. Servicing of Touch Control Panel

We describe the procedures to permit servicing of thetouch control panel of the microwave oven and theprecautions you must take when doing so. To performthe servicing, power to the touch control panel is availableeither from the power line of the oven itself or from an

external power source.(1) Servicing the touch control panel with power supply

of the oven:CAUTION:

THE HIGH VOLTAGE TRANSFORMER OF THEMICROWAVE OVEN IS STILL LIVE DURINGSERVICING AND PRESENTS A HAZARD.

Therefore, before checking the performance of the touchcontrol panel,1) Disconnect the power supply cord, and then remove

outer case.2) Open the door and block it open.3) Discharge high voltage capacitor.4) Disconnect the leads to the primary of the power

transformer.5) Ensure that these leads remain isolated from other

components and oven chassis by using insulationtape.

6) After that procedure, re-connect the power supplycord.

After checking the performance of the touch controlpanel,1) Disconnect the power supply cord.2) Open the door and block it open.3) Re-connect the leads to the primary of the power

transformer.

approx. 1M ohm

TOUCH CONTROL PANEL SERVICING

4) Re-install the outer case (cabinet).5) Re-connect the power supply cord after the outer

case is installed.6) Run the oven and check all functions.

A. On some models, the power supply cord between thetouch control panel and the oven itself is so short that thetwo cant be separated. For those models, check and

repair all the controls (sensor-related ones included) ofthe touch control panel while keeping it connected to theoven.

B. On some models, the power supply cord between thetouch control panel and the oven proper is long enoughthat they may be separated from each other. For thosemodels, it is possible to check and repair the controls ofthe touch control panel while keeping it apart from theoven proper; in this case you must short both ends of thedoor sensing switch (on PWB) of the touch control panelwith a jumper, which activates an operational state thatis equivalent to the oven door being closed. As for thesensor-related controls of the touch control panel,

checking them is possible if dummy resistor(s) withresistance equal to that of the controls are used.

(2) Servicing the touch control panel with power supplyfrom an external power source:Disconnect the touch control panel completely from theoven proper, and short both ends of the door sensingswitch (on PWB) of the touch control panel, whichactivates an operational state that is equivalent to theoven door being closed. Connect an external powersource to the power input terminal of the touch controlpanel, then it is possible to check and repair the controlsof the touch control panel it is also possible to check thesensor-related controls of the touch control panel byusing the dummy resistor(s).

4. Servicing ToolsTools required to service the touch control panelassembly.

1) Soldering iron: 30W(It is recommended to use a soldering iron with agrounding terminal.)

2) Oscilloscope: Single beam, frequency range: DC-10MHztype or more advanced model.

3) Others: Hand tools

5. Other Precautions1) Before turning on the power source of the control unit,

remove the aluminium foil applied for preventing staticelectricity.

2) Connect the connectors of the key unit to the control unitbeing sure that the lead wires are not twisted.

3) After aluminium foil is removed, be careful that abnormalvoltage due to static electricity etc. is not applied to theinput or output terminals.

4) Attach connectors, electrolytic capacitors, etc. to PWB,making sure that all connections are tight.

5) Be sure to use specified components where high precisionis required.

Transistor2SB1238

EC

B


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To remove the outer case, proceed as follows.1. Disconnect the power supply cord.2. Open the oven door and block it open.3. To discharge the high voltage capacitor, wait for 60

seconds.4. Remove the two (2) screws from the lower portion of the

rear cabinet using a T20H Torx type or GTXH20-100screw driver.

5. Remove the remaining three (3) screws from rear andtwo (2) screws along the right and left sides of outer case.

6. Slide the entire outer case back out about 1 inch (3 cm)to free it from retaining clips on the cavity face plate.

Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts mayresult in severe, possibly fatal, electric shock.(Example)

High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc..

WARNING:Avoid possible exposure to microwave energy. Please follow the instructions below beforeoperating the oven.

WARNING AGAINST HIGH VOLTAGE:

OUTER CASE REMOVAL

COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE

To prevent an electric shock, take the following pre-cautions.

1. Before wiring,1) Disconnect the power supply cord.2) Open the door block it open.3) To discharge the high voltage capacitor, wait for 60

seconds.2. Dont let the wire leads touch to the following parts;

1) High voltage parts:Magnetron, High voltage transformer, High voltagecapacitor and High voltage rectifier assembly.

2) Hot parts:Oven lamp, Magnetron, High voltage transformer

WARNING FOR WIRING

1. Disconnect the power supply cord.2. Visually check the door and cavity face plate for damage

(dents, cracks, signs of arcing etc.).

Carry out any remedial work that is necessary beforeoperating the oven.Do not operate the oven if any of the following conditionsexist;1. Door does not close firmly.

2. Door hinge, support or latch hook is damaged.3. The door gasket or seal is damaged.

4. The door is bent or warped.5. There are defective parts in the door interlock system6. There are defective parts in the microwave generating

and transmission assembly.7. There is visible damage to the oven.

Do not operate the oven:1. Without the RF gasket (Magnetron).2. If the wave guide or oven cavity are not intact.

3. If the door is not closed.4. If the outer case (cabinet) is not fitted.

and Oven cavity.3) Sharp edge:

Base plate, Oven cavity, Waveguide flange, AnglesGuides and other metallic plates.

4) Movable parts (to prevent a fault)Close flow fan, Fan motor, Switch.

3. Do not catch the wire leads in the outer case cabinet4. Insert the positive lock connector until its pin is locked

and make sure that the wire leads do not come off evenif the wire leads are pulled.

5. To prevent an error function, connect the wire leadscorrectly, referring to the Pictorial Diagram.

Please refer to OVEN PARTS, CABINET PARTS, CONTROL PANEL PARTS, DOOR PARTS, when carrying out any the following removal procedures:

Special screw

Screw driver(Type: TORX T1120H orGTXH20-100)

Figure C-1. Special screw position


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POWER TRANSFORMER REMOVAL

Reinstallation

1. Rest transformer on the base plate with its primaryterminals toward the left side.

2. Secure transformer with four screws to base plate.3. Re-connect wire leads (primary and high voltage) to

power transformer and filament leads of transformer tomagnetron and high voltage capacitor. Refer to"PICTORIAL DIAGRAM".

4. Reinstall the oven cavity assembly to the base plate.Refer to "OVEN CAVITY ASSEMBLY REMOVAL".

5. Re-install outer case and check that oven is operatingproperly.

1. Disconnect the power supply cord and then removeouter case.

2. Remove the oven cavity assembly from the base plate.Refer to "OVEN CAVITY ASSEMBLY REMOVAL".

3. Discharge the high voltage capacitor.4. Disconnect the wire leads (primary and high voltage)

from power transformer and the filament leads from themagnetron and capaci

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