Harmon 4200A Selective Voltmeter Instruction Manual - April 1974

HARMON SELECTIVE VOLTMETER 4200 HARMON 4200 FEATURES

1. AC or battery operation, completelyportable

2. 6 digit frequency display

3. Internal calibration source for level

4. All solid state

5. Distortion free to -70 db

6. Crystal controlled, narrow and wide band selectivity

7. Audio signal indicator

8. Accurate readout of incoming frequency to -80 db level

9. Maximum full scale sensitivity -80 db

PRELIMINARY SPECIFICATIONS:

FREQUENCY RANGE: 20HZ to 200KHz

3 Bands

20Hz to 10KHz

10KHz to 100KHz

100KHz to 200KHz

AMPLITUDE ACCURACY:

Overall accuracy: :to.5 db

Frequency response flatness: ±0.2 db

Meter tracking:±0.1 db or 1% of reading

(2.0 db to ·10 db indication)

SELECTIVITY: 25Hz Bandwidth 250Hz Bandwidth

25Hz 3 db 250Hz 3 db

75Hz 60db 750HZ 60db

- , I

FREQUENCY RESOLUTION: ±1Hz on counter

mode II

AMPLITUDE RANGE: 7.75uV to 10V

I.F. AND SPURIOUS REJECTION: -65db or

greater

INTERMODULATION AND DISTORTION:

-70 db or greater, with 50 db signal increase

INPUT IMPEDANCE: 100K ohm bridging and

600 ohm

TEMPERATURE RANGE: +40 F to +120 F

POWER: Internal Nicad battery, or 110VAC

50-60Hz for operation and battery charging

DIMENSIONS: 95/16" High, 13 1/4" Wide,

8 5/8" Deep

WEIGHT: Approximately 20 pounds

HARMON ELECTRONICS, INC. GRAIN VALLEY, MISSOURI 64029 Telephone: Area Code 816, 249-3112

WØCCW

HARMON 4200A

SELECTI VE VOL TMETE R

INSTRUCTION MANUAL

Q

4200 Selective Voltmeter

WØCCW

HARMON

FREQUENCY SELECTIVE

VOLTMETER

Model 4200

WARRANTY

This unit is manufactured by Harmon Electronics, Incorporated, Grain Valley, Missouri 64029, which company warrants all items of their manufacture to be free from defects in materials and workmanship. If a failure occurs within one year of date of shipment in normal service due to defective parts or workmanship, forward the unit to Harmon Electronics, Inc. which company will repair or replace without charge, providing required parts are still available. Air freight collect charges will be paid on units requiring repair or replacement. Units damaged by misuse, accident, neglect or improper installation will be repaired at cost.

PRINTED IN U.S.A.

Harmon 4200

Selective Voltmeter

TABLE OF CONTENTS

Page

SECTION I - OPENING INTRODUCTION

General Description 1-1

Specifications 1-2, 1-3

SECTION II - PRINCIPLES OF OPERATION

Unit Familiarization 2-1,2-2,2-3

Battery Charging , 2-4

Calibration 2-5

Operation 2·6, 2-7

SECTION III - THEORY OF OPERATION

General 3-1

Block Diagram Theory 3-2,3·3

Detailed Circuit Theory 3-4 thru 3-11

SECTION IV - MAINTENANCE

Trouble Shooting 4-1 thru 4-8

Parts Placement 4-9 thru 4-21

Alignment 4-22 thru 4-24

SECTION V

Parts List 5-1 thru 5-17

Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-18

System Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-19

SECTION I

General Descriptionl

The 4200 Selective Voltmeter features lightweight portability, with laboratory accuracy,

for the measurements of voltage or power levels at specific frequencies in the range of 20Hz to

200KHz.

The frequency under test is displayed to the cycle on the 4200's six digit counter.

The 4200, with its solid-state circuitry and rechargeable ni-cad battery, will operate up to

25 hours without recharging.

Some of the other features include:

Two crystal controlled bandwidths.

Two types of counter readouts.

Internal signal for level calibration

Battery condition indicator

Built-In battery charging circuit.

Audio circuitry for aural indication of signal presence.

Knobs, switches, and connection points located on front panel for accessibility.

4/71 1-1

SPECIFICAnONS:

Frequency Range as Displayed on Counter and Frequency Window

20Hz to 200KHz in three bands Band A 20Hz to 10KHz Band B 20KHz to 100KHz Band C 100KHz to 200KHz

Input Level

7.75uv to 10v, or -100 to +22db (Reference: ODBM 600 ohms)

Calibration Level and Frequency

-30db at 1KHz

Input Impedance

lOOK ohms bridge and 600 ohms (200V DC blocking)

Crystal Filter Selectivity

arrow: 25Hz Nominal at 3db down 80Hz Manimum at 60 db down

Wide: 250Hz ominal at 3db down 750Hz Maximum at 60db down

Level Measurement Accuracy

+ 0.5 db maximum deviation over frequency range

Internally Generated Harmonics

-70db or less (with 50db sensitivity increase)

LF. Rejection

-65db or greater

Counter Resolution

6 digit ~ 1Hz

Input Level Range for Counter Mode 2 Operation

-90db to +22db

Counter Clock Frequency

1,000,000Hz Crystal Controlled

Counter Operation

Mode I - Continuous readout, tracks tuning of voltmeter with or without input signal

Mode 2 - Accurate readout when input signal above -90db is tuned into unit. Meter does not have to be peaked, only indicating above -lOdb to have input signal accurately displayed.

Audio Indication

1,000Hz with a signal input 1-2

4/71

SPECIFICATIONS (Continued):

Power Supply

Internal 5.0 VDC Nickel-Cadmium battery. AC operation and battery charging from 115 volt 60Hz source.

Battery Discharge Times

Battery 1 (Counter on) - Approximately 8 hours

Battery 2 (Counter off) - Approximately 25 hours

Battery Recharge Times (for completely exhausted baUery)

Power Switch off - 16 to L8 hours Power Switch in any other battery setting maintains trickJe charge to battery.

Temperature Range

+40 degrees F. to +120 degrees F. typical

Dimensions

105/8" H. 13 112" W. 11" D.

Weight

20 pounds

1-3 4171

L

ATTENUATOR

INPUT SELECTOR

u c"BALANCE "

"R"BALANCE

SECTION II

UNIT FAMILIARIZATION

SDIGIT COUNTER READOUT

COUNTER MODE SWITCH

MECHANICAL FREQ•.DIAL READOUT

TUNING

CAL.

POWER . SWITCH BAND SELECTOR

AUDIO

115VAC

4/71 2-1

UNIT FAMILIARIZATION:

POWER SWITCH- INPUT SELECTOR

OFF. Turns entire unit off. Unit is charged in the off position from 115VAC.

AC. Unit fully operates in this position when 115VAC is connected. Battery does not receive charge.

BAT 1. Unit fully operates in this position. If AC is plugged in, battery receives trickle charge. This position draws the most battery current.

BAT 2. In this position, the counter is turned off. The Selective Voltmeter portion is still fully operational. This position draws the least battery current.

BAT TEST. This position loads the battery by turning entire unit on, disconnects the AC input, if applied, and displays the battery condition on the meter.

BAND SELECTOR

Three-position push-button switch selects frequency of the band to be tuned.

TUNING

Variable capacitor tunes the unit to the frequency as displayed by counter on Mode I and by frequency window.

ATTENUATOR

Twelve-position rotary switch calibrated in 10db steps (twelfth blank for ease of operation), BOdb through +20db or in volts .0001 to 10 volts.

Cal: Switches calibration signal to input terminals for level calibration of unit.

Bridge: Selects input impedance of lOOK ohms.

600 Ohms: Selects input impedance of 600 ohms.

CAL-

Potentiometer sets I.F. gain to Odb reference.

SELECTIVITY

Two-position switch that selects bandwidths of 25Hz or 250Hz.

COUNTER MODE-

Mode 1: This switch position applies a signal to the counter which causes counter to respond to the setting of tuning knob.

Mode 2: This position applies a reconstructed signal to the counter only when an input signal is tuned in. In this position, the counter responds only to the input signal, not the tuning knob.

AUDIO

Potentiometer controls audio level out of speaker.

INPUT

Five-way binding post, signal input.

4/71 2-2

UNIT FAMILIARIZATION (Continued):

115VAC

Polarized input connector for 115 volt 60Hz AC power.

BALANCE

R. Potentiometer balances resistance of ring modulator. This control is used in conjunction with "c" control to eliminate false signal reading when unit is tuned to 20Hz.

C. Piston trimmer capacitor balances capacitance of ring modulator.

4/71 2-3

I

BATTERY CHARGING

Recommended procedure is to charge the battery with the Power Switch in the "OFF"

position for a period of 16 to 18 hours, with the power cord of the 4200 connected to 115VAC

60Hz source.

With the Power Switch in Bat 1, or Bat 2 positions and continuous operation from the AC

power line the unit is receiving a trickle charge, therefore battery charging is not necessary.

When the 4200 is operating in its AC position, the battery is not being charged.

~

4/71 2-4

l

CALIBRATION:

1. Set POWER SWITCH to AC (if connected) or BAT 1.

2. Set INPUT SELECTOR to CAL.

3. Set ATTENUATOR to -30db.

4. Set SELECTIVITY SWITCH to 25Hz.

5. Push Band A button in.

6. Adjust TUNING for signal at 1KHz and peak meter.

7. Adjust CAL control for Odb indication on meter.

NOTE: Always disconnect any signal from the input terminals before attempting calibration of this unit.

4/71 2-5 \...-\

I

OPERATION:

The following is intended only as a guide for operating the unit. Each set of circumstances, when measuring, requires obvious deviations and modifications of the following procedures.

Line Measurements (above 50Hz)

1. Set POWER SWITCH to BAT 1 position.

2. Set COUNTER MODE SWITCH to MODE 1.

3. Make sure unit is calibrated as per Steps 1 through 7 (Page 2-5).

L

4. Connect line to be measured to input terminals, observing polarity.

5. Set INPUT SELECTOR SWITCH to position desired, BRIDGE or 600 ohms.

L

6. Push BAND SELECTOR button in for, the frequency range of signal to be measured.

7. Set SELECTIVITY switch to 25Hz.

B. Turn AUDIO control C.W. until noise is heard out the speaker.

L 9. Set ATTENUATOR to -BOdb position.

L

L 4/71 2-6

10. Adjust TUNING knob until signal presence is indicated by 1KHz tone out of speaker.

11. Monitor meter. If meter is pegged, switch attenuator clockwise until an on scale reading is obtained. With tuning knob, peak meter for maximum indication.

12. Make sure attenuator is positioned to give a meter indication in the upper two-thirds of the scale with meter peaked by tuning knob.

13. To accurately determine the level of the input signal, the meter indication in db or volts is added ~lgebraically to the value indicated by the attenuator position.

14. To accurately determine the frequency of the input signal, set the counter mode switch to Mode 2. After waiting for the counter to stabilize (3 seconds), the input frequency is read directly from the counter. NOTE: In this step, the meter indication must be above a -10db for counter to accurately count.

15. After completion of measurements, disconnect input and turn unit off.

OPERATION (50Hz and below):

I. Calibrate unit as in Steps I thru 7 (Page 2-5).

2. Set SELECTIVITY switch to 25Hz position.

3. Push BAND A selector button in.

4. Set INPUT SELECTOR to BRIDGE.

5. Adjust TUNING control to low end of Band A until meter indicates approximately Odb.

6. Adjust BALANCE C for minimum meter indication.

7. Adjust BALANCE R for minimum meter indication.

8. Repeat Steps 5, 6 and 7 until meter indication is below -15db, when tuning is adjusted for maximum meter indication.

9. Connect signal to be measured at input terminals of the unit.

10. Proceed with measurements using procedures as in Steps 5 thru 14 (Page 2-6).

II. After measurements are complete, disconnect input and turn unit off.

NOTE: When balancing unit, removing the 115VAC power cord may be helpful.

4/71 2-7

SECTION III

THEORY OF OPERATION

GENERAL

The 4200 is basically a very Selective Superhetrodyne receiver with a calibrated attenuator

in the input section, and a precision meter and counter in its output for precise level and fre

quency measurements.

The following paragraphs are intended for use with the block diagram on Page 5-18, to give

the operator or technician the basic theory of operation.

Due to the fact that the 4200 Selective Voltmeter is comprised basically of several printed

circuit boards and each board performs a general function, the following will help to familiarize

the board name, its PC number and its function:

INPUT BOARD, PCl: This PC board, in general, provides mixing functions.

LOCAL OSCILLATOR BOARD, PC2: This board basically sets up the frequency range of

the 4200, oscillating between 250,020Hz to 450,000Hz.

LOW PASS FILTER BOARDS, PC3 & PC4: These boards allow only the frequencies in the

range of the 4200 to enter the mixer.

CRYSTAL FILTER BOARD, PC5: This board contains the bandwidth switch and com

ponents for matching the crystal filters to the surrounding circuitry.

I.F. AMPLIFIER BOARD, PC6: Its function is to amplify the 250KHz I.F. signal and to

convert it to a d.c. current to be displayed on the 4200 meter.

COUNTER BOARD, PC7: This board contains circuitry for converting, counting and dis

playing frequencies.

RESTORED FREQUENCY L.P. FILTER BOARD, PC8: Rejects unwanted signals so that

only the proper one will be displayed on the counter.

POWER SUPPLY BOARD, PC9: Here a d.c. voltage from the battery is converted into

various higher and lower values. Also contained on this board is circuitry for recharging the

battery and fuses for protecting the 4200.

4/71 3-1

BLOCK DIAGRAM THEORY

The signal to be measured is basically coupled through the Input Selector, S1, then on

through or attenuated in the attenuator AT1, through PC1Q1 and PC1Q2, Source and Emitter

followers, and if it is in the frequency range of the 4200, it is passed through the Low Pass Filter,

PC3 and PC4 to the Ring Modulator, PC1D2 through D5.

Frequency Selector, PC2S3 selects a certain value of capacitance which causes PC2Q 1 to

oscillate at a specific frequency. This frequency, in the range of 250,020Hz to 450KHz, is

coupled through Source Follower, PC2Q2 and after being amplified in the Modulator Driver,

PC2Q4, is applied to the Ring Modulator, PC1D2 through D5 as the local oscillator injection.

The output of the Ring Modulator is the difference frequency, 250KHz, which is amplified

in the Filter Drivers, PC1(Q4 & Q5). This 250KHz is routed to one of two Bandpass Filters,

FL1 or FL2 depending upon the setting of PC5S4, Selectivity Switch, through three stages of

I.F. amplification, PC61C1 through IC3, detected in the Meter Detector PC6(D1 & D2) and

displayed on the Meter MI.

The third I.F. Amplifier, PC6IC3, provides a 250KHz signal to a Balanced Modulator,

PC6(D3 - D4). A 249KHz signal is originated in the Crystal Oscillator, PC6Q5, and coupled

through the Modulator Driver, PC6Q6, to the Balanced Modulator.

The resultant frequency is the difference, a 1KHz signal, which is amplified by the Audio

Amplifier, PC6Q7, through Q12 and applied to the speaker, LSI.

The second I.F. Amplifier, PC6IC2, provides a 250KHz signal through Source Follower,

PC6Q4, to Amplifier PC6Q3 and then to Counter Mode Switch, S6.

Crystal Oscillator, PC7Q1 generates a 250KHz signal which after being coupled through an

Emitter Follower, PC7Q2, is also applied to the Counter Mode Switch, S6.

The Product Detector, PC7IC1, receives one of the 250KHz signals applied to S6, depending

upon S6's position and a Local Oscillator Signal from an Emitter Follower, PC2Q3.

The mixed output of the Product Detector is applied to the Low Pass' Filter, PCB, where

only the difference frequency is passed to amplifiers, PC7(Q3 & Q4).

Crystal Oscillator, PC7Q5, generates a 1MHz signal that is coupled through PC7Q6, an

Emitter Follower, shaped into a pulse in PC7IC2, and divided by ten, six times in the Decade

Counters, PC7IC3 through ICB.

A 1KHz signal is taken out of PC7IC5, Decade Counter, and coupled through PC1Q3, an

Emitter Follower, and applied to the Input Selector S1 for use in calibrating the 4200.

4/71 3-2

BLOCK DIAGRAM THEORY (Continued)

From PC7IC8 the 1Hz signal is coupled through a portion of an Inverter, PC7IC9, it is then

converted to a 1 second gate in the Dual J.K. Flip-Flop, PC7ICI0. It is then coupled through an

Emitter Follower, PC7Q7, and Amplified in PC7 QI0. This 1 second gate is also coupled back to

other portions of the Hex Inverter, PC7IC9, where after inversion, it is taken out and converted

to triggers and amplified in PC7Q9, the Reset trigger Amp, and the other, Storage Pulse Amplifier

PC7Q8.

Counter Drivers, PC7ICII through ICI6, receives signal information from PC7Q4; a Clock

Pulse from PC7QI0; Reset triggers from PC7Q9, and Storage Pulses from PC7Q8. These Counter

Drivers decode this information and drive the Counter Display tubes, PC7V 1 through V6.

When the 4200 is connected to 115Vac, this voltage is converted to a lower value by Power

Transformer, Tl, and coupled through AC Fuse, PC9Fl, to the Bridge Rectifier, PC9BR1, filtered

and zenered by PC9(CI & ZI), then connected to a section of the Power Switch, S5.

Battery, Bl, furnishes 4.8V through fuse, PC9F2, to Power Switch, S5, then to the DC to

AC Inverter, PC9(Ql,Q2 & Tl), which converts the 4.8V to four different ac voltages.

These ac voltages are converted to dc by the following circuits, -27V Rectifier, Filter,

PC9(DI & C5); -13V Rectifier, Regulator, PC9(D2 & Q3); ~9.6V Rectifier, Filter, PC9(D3 &

C4); +9.6V Rectifier, Filter, PC6(BRI & C19) and Regulator, PC6(QI & Q2), and are used

throughout the 4200.

Zener, PC9Z2, reduces the battery voltage to 4.3V for use in the Selective Voltmeter

Counter Circuitry and also after being coupled through a section of S5, it is used in PC9R2, the

Battery Test Resistor, for monitoring Bl 's charge.

4/71 3-3

DETAILED CIRCUIT THEORY

The signal to be measured is applied as follows, pOSe to BPI (Red), neg to BP2 (black),

which is also chassis ground. The signal is coupled through C1, a 4.0mfd, 200 vdc capacitor to the

Input Selector Switch, S1. When the Input Selector is set in the 600 ohm position, a 604 ohm

resistor is basically switched across BPI and BP2, establishing an input impedance of 600 ohms.

When Sl is set in Bridge position, the signal is coupled directly to the Attenuator AT1, which has

an input impedance of lOOK ohms.

Attenuator AT1 provides attenuation in 10db steps. In the -80 position the signal is coupled

straight through the attenuator. In the -70db position, a 10db pad, comprised of AT1 (R3 & R9)

attenuates the signal 10db. In the -60db position, a 20db pad, AT1 (R4 & RIO), attenuates the

signal20db. -50db position, AT1 (R5 & R11) provide 30db of attenuation.

In the -40db position, AT1 (R6 & R12) provide 40 db of attenuation.

AT1 (R 1 & R2) provide 50db of attenuation in the -30db position.

In the -20db attenuator position, a 50db pad, AT1 (R1 & R2) is added to a 10db pad, AT1

(R3 & R9) making a total of 60db of attenuation.

-10db attenuator position, 50db pad, AT1 (R1 & R2) plus 20db pad, AT1 (R4 & RIO) add

for 70db total. Odb atten. position, 50db pad, AT1 (R1 & R2) plus 30db pad, AT1 (R5 & R11),

add for 80db total. +10db atten. position, 50db pad, AT1 (R1 & R2) plus 40db pad, AT1

(R6 & R12) add for 90db total. +20db atten. position, 50db pad, AT1 (R1 & R2) plus another

50db pad made up of AT1 (R7 & R8) for a total of 100db of attenuation.

The signal is coupled out of the attenuator to PCIP1 through a protection resistor, PC1R1,

coupling capacitor, PC1C1, and onto the gate of PC1Ql. The signal is then coupled from the

source of PC1Q1 and onto the base of PC1Q2. PC1R4, being common to both PC1Q1 & PC1Q2

reduces distortion. The signal is then coupled from the emitter of PC1Q2 thru coupling capacitor

PC1C4, thru the impedance matching resistor PC1R6 and to PC1jl.

From PC1j1, the signal is applied to the Low Pass Filter input section, PC3. This Filter has

a pass band of 20Hz to 200KHz. Its cutoff frequency is around 210KHz, with its ultimate

attenuation frequency set at 250KHz. PC4 is the output section of the Low Pass Filter. The

signal is coupled to PC1j2, thru PC1R12, an impedance matching resistor, and into the center

tap of PC1Tl.

Local Oscillator, PC2, is basically a FET oscillator made up of PC2Q1, PC2L1, C2 & a

bank of capacitors controlled by switch PC2S3. Initial alignment is on Band B, which establishes

4/71 3-4

DETAILED CIRCUIT THEORY (Continued)

the value of "L" in the ckt. This value of "L" remains the same for all three bands. On band B,

capacitors PC2CI, PC2C2, PC2C3 are switched in parallel with main tuning capacitor C2. 'This

combination of capacitors are in series with PC2LI & PC2L2. PC2Cl6 provides coupling to the

gate of PC2Q1 while PC2R2 provides feedback to maintain oscillation. PC2C1 adjusts the upper

end of Band B (350KHz), PC2L2 adjusts the low end of Band B, (260KHz). Band A switches

PC2(C6, C7, C8 & C9) in parallel with C2. It also switches the combination of PC2(C4 & C5)

in series with C2. PC2C6 sets the high end of Band A (260KHz) while PC2C4 adjusts the low

end, 250,020Hz,

Band C switches PC2(CI2, C13, C14) in parallel with C2. It also switches the combination

of PC2 (CIO & CII) in series with C2. PC2Cl2 sets the high end of Band C at 450KHz &

PC2C10 adjusts the low end to 350KHz. This generated signal is coupled from the source of

PC2QI through PC2Cl8 to the gate of source follower PC2Q2. Capacitors PC2Cl8 and PC2Cl9

form a voltage divider which help keep the output of the Local Oscillator flat over its entire

frequency range. PC2Q2 is taken off of its source in two ways. One is coupled directly to the

base of PC2Q3, Emitter Follower. The other is from a voltage divider in the source of PC2Q2,

made up of PC2R5 & PC2R6. Emitter Follower PC2Q3 is utilized to provide isolation for the

Local Oscillator. The output is taken from a voltage divider, PC2(R7 & R8), in the emitter of

PC2Q3 and applied to PC2P3 for use in PC7.

The signal taken from PC2(R5 & R6) is coupled thru C20, a coupling capacitor and applied

to the base of amplifier PC2Q4. PC2Q4 drives the primary of PC2TI, while degenerative feed

back thru PC2(C22 & R11) help to keep the output distortion free. The signal is then taken from

the secondary of PC2TI thru connectors PC2(P5 & P7) to PCI (P7 & P9).

The ring modulator, basically is made up of hot carrier diodes, PCI(D2, D3, D4, D5). Re

sistors PCI(RI4, R15, R17, R18) are 316 ohms, 1% precision resistors used in series with the hot

carrier diodes to improve their forward conduction characteristics, making the ring modulator

easier to balance, and improving its distortion characteristic. From PCI(P7 & P9) the Local Os

cilIa,tor injection signal is applied to the ring modulator at PCI(D3 & R15) and PCI(D5 & RI8).

When the Local Oscillator signal is positive at PCID5, diodes PCI(D4 & D5) are switched on,

allowing current to flow from PCIRl5 to PCID5. When the Local Oscillator signal is negative

atPCID5, Diodes PCI(D2 & D3) are switched on, allowing current to flow from PCIRl8 towards

PCID3. The rate, of course, that this switching occurs depends upon the local oscillator frequency.

4/71 3-5


The input signal that was earlier applied to the center tap of PC1T1 is switched to ground as the

local oscillator alternately switches legs of the ring modulator on and off. The signal path that this

input signal takes is thru either PCIR13 or PCIRI6, thru the "on" ring modulator leg, thru one

half of PC2Tl and to ground at ·PCIP8. Current is now flowing in the primary of PC1Tl in rela

tion to both the input frequency and the local Oscillator frequency. Controls PCIC7 & PCIR13

are course balance controls to compensate for variations in the diodes. These controls relieve the

problem of matching diodes, both in production and field repair. Controls PCIR16 & PCIC8 are

fine balance controls to allow the operator to balance out the undesirable effects of the local os

cillator injection.

The output of the Ring Modulator is taken by the secondary of PClTl. Capacitor PCICI0

is a 200 pfd unit that tunes the secondary to 250KHz, the difference frequency of the input

signal and the Local Oscillator. This 250KHz is applied to the base of PCIQ4 and amplified.

From PCIQ4's collector it is coupled thru PCIC12 to the base of PCIQ5, Crystal Filter Driver.

Both PCl(Q4 ,& Q5) are low distortion amplifiers. The amplified signal is taken from the

collector of PCIQ5, thru PCIC13 and out of PCl via PCIPI0.

The 250KHz signal is coupled to PC5S4, selectivity switch, which serves two functions.

First, it allows the operator to select the crystal filter bandwidth desired, and it shorts the unused

filter to ground. Crystal Filters FLI & FL2 have center frequencies of 250KHz. FLI has a

bandwidth at 3db down of 25Hz, while FL2 has a 250Hz bandwidth at its 3db points. Capaci

tors, PC5C1 through PC5C8, are attached to the inputs and outputs of both filters and are used

to minimize ripple in the passband of the filters. Resistors PC5Rl & PC5R2 used in conjunction

with certain types of crystal filters, pads the output of FL2 down so that the same 250KHz sig

nalloss is present in it as in FLI. From PC5S4 the signal is coupled to PC6Pl.

From PC6Pl the 250KHz signal is coupled through PC6Rl, an impedance matching resistor

to pins 1 & 4 of the First I.F. Amplifier, PC6IC1. Here the 250KHz signal is amplified and

coupled from pin 6 of PC6ICI to the center tap of PC6Tl, the 1st I.F. transformer. PC6C4 and

the primary of PC6Tl are resonant at 250KHz. The signal is coupled between pins 1 and 4 of the

2nd I.F. amp PC6IC2 by PC6Tl's secondary. The amount of I.F. gain is varied by the Cal poten

0- tiometer R3 which is in PC6IC2's emitter leg. The signal is amplified by PC6IC2 and is coupled

out pin 6 of PC6IC2 to the center tap of the primary of PC6T2. PC6T2's primary is tuned to

250KHz by PC6CI0. One of PC6T2's secondaries couples the signal between pins 1 & 4 of

4/71 3-6


PC6IC3, the third I.F. amplifier. After amplification the signal is taken out of pin 6 of PC6IC3

and coupled to the center tap of PC6T3's primary, which is tuned to 250KHz by capacitor

PC6CI5. Another output is taken from pin 6 of PC6IC3, thru coupling capacitor PC6CI6. This

signal will be used in the audio section of the voltmeter. Out of the secondary of PC6T3, the

250KHz signal is coupled to the meter detector circuit. Diodes PC6(DI & D2) rectify the 250KHz

signal, while capacitors PC6(CI7 & C18) filter the rectified current. Resistors PC6(R2 & R3) are

used to match the impedance of the meter, keeping it linear. This dc current is taken out PC6P3

and applied to a section of S5, the Power Switch. This section of S5 allows the operator to re

move this dc current and connect the meter to the battery test circuitry. From S5, the signal is

connected to the positive side of M1, a 100 ua meter.

In the audio section PC6Q5 and PC6Yl, a 249KHz crystal, basically make up a 249KHz

sideband oscillator, the emitter of PC6Q5 is bypassed with PC6(L4 & C26) which being tuned to

249KHz helps start PC6Q5 oscillating. The audio 249KHz signal is coupled out of its collector

through coupling capacitor PC6C27, into the base of PC6Q6, modulator driver. Modulator Driver

PC6Q6 drives the balanced modulator, PC6(D3 & D4) through coupling capacitors PC6(C28 &

C29). PC6Q6, by its phase shifting characteristic turns either PC6D3 or PC6D4 on.

The 250KHz IF signal that couples through PC6C16 is connected to PC6(D3 & D4), the

mixed signals are then coupled through PC6R21 and to PC6C30, which act as a low pass filter.

The output, a difference frequency of 1,000Hz, is coupled through coupling capacitor PC6C31,

through PC6P12 and out to the Audio poteniometer, R4. R4 allows the operator to adjust the

audio level out of the speaker in the voltmeter.

The 1KHz signal is taken from the arm of R4 and is coupled through PC6PI3, PC6C34 and

into the base of the 1st audio amplifier, PC6Q7. The signal is amplified and taken out the col

lector of PC6Q7. It is further amplified by PC6Q8 and coupled to the bases of PC6(Q9 & QI0),

which are push-pull amplifiers which drive another push-pull amplifier PC6(Qll & QI2).

The output is coupled through coupling capacitor PC6C37, to PC6PI4, to LSI speaker.

PC6T2 has a secondary winding for the purpose of furnishing a 250KHz signal to the counter

portion of the 4200. This signal is coupled to the gate of PC6Q4, a source follower, used to pro

vide isolation for the I.F. The signal is coupled to the base of PC6Q3, and after being amplified,

is taken out of the collector, through PC6C22, and out PC6PI0 to the counter mode switch, S6.

PC7Q1 transistor and PC7Y 1 crystal· and their associated circuitry, make up a 250KHz

4/71 3-7


oscillator. Capacitor PC7C5 allows the output frequency to be adjusted to 250KHz precisely. The

output is taken from the collector and is coupled through PC7C8 to the base of PC7Q2, Emitter

Follower. This 250KHz signal is then taken from the emitter, through coupling capacitor

PC7C9, through PC7P3 to the counter Mode Switch S6.

Mode Switch S6 allows the operator to select the type of counter readout desired, which will

be the difference of the 250KHz crystal controlled frequency (Mode 1) or the 250KHz. I.F.

signal from PC6T2 (Mode 2) and the Local Oscillator frequency which is taken from PC2P3.

The output of S6 couples through PC7P8 to pin 3 of PC7IC1, Product Detector. The Local

Oscillator frequency from PC2P3 couples through PC7P9, through coupling capacitor PC7CI0

and into the product detector, PC7ICI on pin 7. The product detector, when both signals are

received, mixes the two and the output is coupled out pin 10. Resistors PC7RI0 through

PC7R13 assist in setting the amount that PC7ICI suppresses the carrier.

The output is coupled through PC7P5 to PC8Pl. PC8 is a low-pass filter, which has a band

pass of 20Hz to 200KHz, PC8 shares the same specifications with the L.P.F. made up of PC3 &

PC4. PC8 passes only the difference frequency that was mixed in the product detector and re

jects all others. The difference frequency is coupled out PC8P3 to PC7PI0, through PC7C13

and to the base of PC7Q3. Here the restored frequency is amplified and taken out of the collec

tor of PC7Q3. The signal is coupled through PC7C15 to the base of PC7Q4. Here the signal is

inverted and amplified to a level of approximately -12.5V and is coupled out PC7Q4's collector

to Pin 3 of PC7ICI6.

PC7Q5 and PC7Y2 basically make up a IMHz oscillator. Capacitor PC7C17 allows the

oscillator to be precisely tuned to IMHz. The IMHz output signal is taken out the emitter of

PC7Q5 and direct coupled to PC7Q6, an emitter follower.

PC7Q6 provides isolation for PC7Q5. The IMHz signal is coupled out the emitter of

PC7Q6, through PC7C21 to pin 1 of PC7IC2, Pulse Shapero Resistor PC7R29, along with capaci

tor PC7C21 preshape the IMHz signal into a pulse. Resistor PC7R28 aids PC7IC2 by providing

feedback to shape the signal into a pulse, which is then fed out of pin 14 to pin 1 of PC7IC3.

PC7IC3, Decade Counter, divides the IMHz pulse by 10. This 100KHz pulse is coupled out pin

12 and direct coupled to PC7IC4, pin 1. PC7IC4, is another decade counter which divides the

100KHz pulse down ·to 10KHz. This 10KHz pulse is direct coupled from pin 12 to pin 1 of

PC7IC5. PC7IC5 decade counter divides this down to 1KHz. This 1KHz pulse out of pin 12 is

4/71 3-8


used in two ways, one way, it is coupled out PC7P6 to PC1P4. From PC1P4 it couples through

PC1C5 and into the base of PC1Q3. PC1Q3 Emitter Follower provides isolation for the count

down chain. Its output is taken through PC1R8 and potentiometer PC1R9 in PC1Q3's emitter.

PC1R9 allows an adjustment in level of the 1KHz pulse. This set level is taken out through

PC1P3 to the input switch 81. When 81 is placed in the Cal position this 1KHz signal is coupled

into the attenuator AT1, for use in the 4200 to set its total gain.

PC7IC6 pin 1 receives the other output from PC7IC5. This 1KHz signal is counted down to

100Hz. It is coupled out Pin 12 to pin 1 of PC7IC7. Again the signal is divided by 10 and its

10Hz output on pin 12 is coupled to PC7IC8. PC7IC8 divides the 10Hz pulses to 1Hz. It is

coupled out of pin 12 and is fed to pin 13 of IC9, Hex Inverter. Here in one section of the Hex

Inverter the signal is inverted and taken out pin 2, direct coupled to pin 2 of PC7IC10, a dual J.K.

Flip-Flop. PC7IC10 converts the 1Hz signal into a one second gate. It supplies this one second

gate at pins 13 and 14, at opposite polaritys. The gate from pin 14 is used to make up the clock

pulse, and is direct coupled to the base of the PC7Q7, an emitter follower, which provides iso

lation and couples the gate to the base of PC7Q10. PC7Q10 amplifies the 1 second gate to a level

of approximately -12.5V and it is taken from the collector and applied to pin 2 of PC7IC16, to

be utilized as the clock pulse.

The other 1 second gate that is originated in PC7IC10 which is taken out of pin 13 is direct

coupled back to another section of the Hex Inverter, PC7IC9. In on pin 10 and after being in

verted it is coupled out on pin 5 to two places. One is through PC7C23 and into the base of PC7

Q8. Capacitor PC7C23 and Resistor PC7R34 make up a differentiating ckt to provide a differ

entiated waveshape.

As the positive going pulse of this waveform is applied to the base of transistor, PC7Q8, it

drives it into conduction. As a result, a sharp negative going pulse of approximately -12.5V is

present on its collector. This is fed to pins 13 of PC7IC11 through IC16, as the storage pulse.

This storage pulse is timed in conjunction with the negative going side of the clock pulse.

Pin 5 also feeds back into pin 14 of the hex inverter. After being inverted it is coupled out

pin 1 through capacitor PC7C24 and into the base of PC7Q9. Here PC7C24 and PC7R36 make

up a differentiating network. Again as in the storage ckt, the positive going pulse is used to turn

PC7Q9 on. This negative going trigger, around -12.5V, is coupled out the collector to pin 4 of

PC7IC11 through IC16 and is used as the Reset trigger.

4/71 3-9


This reset trigger is timed in conjunction with the positive going side of the clock pulse.

When the clock pulse, reset trigger, storage pulse, and an input pulse are present to PC71CII

through ICI6, these integrated circuit decoder-drivers decode the information and drive their

respective seven-segment readout tubes, PC7VI through V6. The tube segments are illuminated

when the following conditions exist. When 1.6V is across the filaments, pins 6 & 9. When a -27V

is references to one side of the filaments, on pin 6 of the tube and when the driver switches

ground to a segment, on pin I, 2, 3, 4, 5, 7, or 8.

Battery BI is a rechargeable 4.8V, 7 AHR nicad unit. Its voltage is brought in through a red

lead into PC9PI, through PC9F2, a 2 amp, so-blo-fuse, used to protect BI and wiring. From

PC9F2 4.8V dc is taken out of PC9P5 and applied to a section of power switch S5.

When 115VAC is connected into the 4200, jl furnishes 115VAC to the primary of Tl.

Power transformer TI, is a step down transformer whose secondary supplies 7.5VAC to PC9P3

and PC9P4. This 7.5VAC is coupled through PC9FI, a 3 amp slo-blo fuse, and is applied to a full

wave bridge rectifier, PC9BRl. Here 7.5VAC is converted to a d.c. voltage and filtered by

PC9Cl. PC9RI and PC9ZIlimit this voltage to 5.6VDC, which is coupled out through PC9P6

and into S5, the Power Switch, for use as a charging vOltage for BI.

If the Power switch, S5, is setting in any position besides HOFF" or HAC", 4.8VDC is

coupled from it through PC9P7 to the center tap of PC9T I 's primary, and biasing resistor PC9R3.

This voltage causes either PC9QI or PC9Q2 to conduct, rapidly building flux lines in the primary

of PC9Tl. PC9TI has core material that is easily saturated and when saturation takes place, the

feedback winding of PC9TI, causes the conducting transistor to be switched off. The resulting

collapsing field switches the other transistor on.

The frequency of oscillation is controlled somewhat by resistor PC9R3.

Capacitor, PC9C2, is used to keep the spikes from the Inverter from coupling back into the

battery or to other circuits.

The oscillating of PC9(QI, Q2) and the primary of PC9TI, causes an AC voltage to be

coupled into the secondaries of PC9TI, one of which is coupled out PC9(PI3 & P14) to PC6

(P7 & P8).

After being coupled into PC6BRI, it is rectified and then filtered by PC6CI9.

PC6(QI & Q2) provides regulation while PC6ZIlimits the dc level to 9.6VDC. This voltage

is used throughout the 4200.

4/71 3-10

- -

L DETAILED CIRCUIT THEORY (Continued)

Another AC voltage is coupled out PC9Tl's secondary, rectified by PC9Dl, filtered by

PC9C5 and coupled out PC9Pli to a section of 85. When 85 is placed in AC or Bat 1 this -27VDC

is coupled to PC7PI2.

A third vOltage is coupled out PC9Tl's secondary, rectified by PC9D2, and filtered by

PC9C3.

Regulator, PC9Q3, regulates this voltage and PC9Z3 limits its output to a -13VDC. This is

coupled out PC9P12 to a section of 85. When 85 is placed in AC or Bat 1, this -13VDC is

coupled to PC7Pll.

A fourth secondary winding on PC9Tl furnishes AC voltage to PC9D3, which rectifies it to

dc. Capacitor, PC9C4, filters this +9.6VDC. The positive of this +9.6V is referenced to the -27V

by a connection on PC9. The negative side of the ±.9.6V is coupled out through PC9P15 to

PC7PI3. This voltage is used in 85's AC Qr Bat 1 positions for the filament potential of PC7Vl

through V6.

3-114/71

SECTION IV L

I TROUBLE SHOOTING I

L

GENERAL

In case of difficulty with the 4200, the following suggestions may be helpful.

1. Check the battery condition, make sure it reads HO"db or above on the meter, when the

power selector is switched to the Bat. Test Position.

2. Check the 4200's control settings. If you are making measurements, check to make sure

that the Input Selector is not on HCal." or that the attenuator setting is not too high. Check to

make sure the proper Frequency Selector button is pushed HIn". If the 25Hz Selectivity position

is used, turn the Audio Control up and rotate the tuning knob slowly, so that a signal will not be

unknowingly bypassed.

3. If the Power Selector is set on the AC position, make sure that 115VAC is connected to

it.

4. If no solution has been found as to why a problem exists, try calibrating the 4200. This

will give it a system check that will quickly tell if a problem exists within it.

5. If the unit will not calibrate properly, determine what section or sections of the volt

meter are causing the problem. The problem in most cases, should fall under one or more of the

following catagories.

a. Unit totally inoperative in all power selector settings.

b. Unit inoperative in AC power selector setting.

c. Unit will not calibrate, counter tubes illuminate, mayor may not display in Mode I.

d. Unit calibrates, shows correct level and frequency measurements, but has no audio indi

cation.

e. Unit will not read out frequency in one setting or another of counter Mode Switch, all

other indications ok.

The following is probably the most common cause of the problems, a through e.

To isolate the defective component and to repair it will of course necessitate removing the

unit from its case. Do this by placing the 4200 face down on a soft cloth and remove the two

4/71 4-1

TROUBLE SHOOTING (Continued)

screws from the back of the case. Lift the case from the unit.

If the problem resembles a or b, remove the power supply cover and check fuses PC9F1 or

PC9F2.

The remaining problems are more difficult to isolate and it will be very helpful to use the

following in locating problems, the Schematic, the component placement photographs, and the

dc. voltage measurements.

Now, breaking problem c down further, if the unit will count in Mode I, this tells us that the

Local Oscillator PC2, is functioning the counter is developing the Cal signal, and that the power

supply, PC9, is supplying the proper dc voltages out.

This leaves the possible cause in the following areas: input board, PCl or I.F. board, PC6.

If the unit would not count in Mode I in problem c, then we would also have to look at

PC9, the power supply board, PC7, the counter board, and PC2 the Local Oscillator board.

Problem d would most likely involve PC6, the I.F. board.

Problem e would likely be caused in PC7, the counter board, or possibly in PC6, the I.F.

board.

4/71 4-2

TROUBLE SHOOTING

INTEGRATED CIRCUIT & TRANSISTOR

CONFIGURATIONS (LOOKING AT TOP VIEW)

24 PIN IC'S MEM1056

INDEX 14 8POLCJ I 7

14 Pin IC's MC-724, SN-7490, MC-789, MC-790

89

7

612 ---

5

3 2

MC 1550 CA 3005 10 Pin IC's 12 Pin IC's

B B

21\15811, 2N3905, 21\15810 21\11306, 2N1307, 2N696

C

2N3856

Base

Drain Source

Collector Emitter

Gate 'A Case 2N3638 F. E. T.

2N3822, 2N3684

4/71 4-3


Set 4200 Controls as follows before taking DC voltage measurements.

Power - Bat. 1 (Battery Fully Charged)

Input Selector - Cal.

Mode - 1

Cal - Approximately Centered

DC voltage readings taken with VTVM.

Voltages may vary 10%

All voltages taken with respect to chassis ground.

All voltages positive unless otherwise indicated.

4/71 4·4


VOLTAGE MEASUREMENTS, DC

Source Emitter

PCl

Ql 3.6V

Q2 2.9V

Q3 l.25V

Q4 .98V

Q5 .97V

PC2

Ql .7V

Q2 2.3V

Q3 l.7V

Q4 2.2V

PC6

Ql 9.6V

Q2 .OV

Q3 l.2V

Q4 l.9V

Q5 l.3V

Q6 l.3V

Q7 5.4V

Q8 9.4V

Q9 4.3V

QIO 4.3V

Qll 9.4V

Q12 .OV

Gate Drain Base Collector

.85V 9.4V

3.6V 9.4V

l.7V 9.0V

l.7V 3.0V

l.7V 3.4V

.OV 9.5V

l.6V 9.5V

2.3V 9.5V

2.8V 9.5V

lO.5V 13V

.62V lO.5V

l.9V 3.9V

.76V 9.4V

l.9V 7.6V

l.6V 8.0V

6.0V 8.7V

8.7V 4.25V

4.25V 8.7V

4.25V .6V

8.7V 4.3V

.6V 4.3V

4/71 4-5

PC6 (Continued)

IC-l

1

6

8

9

10

IC-2

1

2

6

8

9

10

IC-3

1

6

8

9

10

PC7

IC-l

1

3

7

9

10

11

12



.72V

9.6V

5.0V

9.6V

4.25V

.76V

.IIV

9.6V

5.0V

9.6V

4.3V

.76V

9.4V

4.8V

9.4V

4.2V

3.8V

1.4V

3.7V

8.8V

8.0V

6.8V

4.0V

4-6 4/71



PC7 (Continued)

IC-2

1 .3V

3 l.8V

11 4.5V

14 l.OV

IC-3

1 l.OV

5 4.5V

11 .72V

12 l.7V

IC-4 through IC-8

1 l.8V

5 4.5V

11 .72V

12 l.7V

IC-9

1 0 to 4.3V

2 .6 to l.2V

5 .4 to 2V

10 .4 to l.4V

11 4.5V

13 .8 to l.7V

IC-I0

2 .6 to 1.2V

11 4.5V

12 .OV

13 .4 to l.4V

14 .4 to l.6V

4-74/71



PC7 (Continued)

IC-II

1

3

7

9

10

11

12

3.8V

1.4V

3.7V

8.8V

8.0V

6.8V

4.0V

QI

Q2

Q3

Q4

Q5

Q6

Q7

Q8

Q9

QIO

2.0V

2.IV

.92V

-I2V

3.3V

2.6V

oto IV

-I2.5V

-I2.5V

-.1 to -.5V

2.6V

2.7V

1.6V

-I2V

3.5V

3.3V

.4 to 1.5V

-I2.5V

-I2.5V

-.3 to -IV

7.2V

9.0V

4.4V

-4.2V

9.0V

9.0V

4.5V

-.35V

-.33V

oto -I3V

PC9

QI

Q2

Q3

BRI

ZI

Z2

DI

D2

PI5

Z3

OV

OV

-I2V

5.3V

5.3V

4.4V

-26.5V

-I5.5V

-36V

-I2.5V

-.2V

-.2V

-I2.5V

4.8V

4.8V

-I5.5V

4/71 4-8

HARMON 4200 VOLTMETER

PC8

PC7

PC6- -.

- ._-

----

-

Back of 4200

4/71 4-9


PCI

FL2

FLI

(5 PLACES)

JI

ADJ HOLES

Bottom of 4200

4/71 4-10

HARMO 4200 VOLTMETER

PC 9 I I 1,

PC7 \

\ \,

LPF ATI MI

CI

SER NO.

Left Side 4200

4/71 4-11


\

PCB" '"

\ \ \

\ \

PC7 \

J

PC6 \

",--------'\'\

-~~ ...........~~..

\ \ \ \

\ \

Right Side 4200

4/71 4-12


JI J2

R2

R5

P3

CIO

Q4

R9

RI4 Q5

P9 01

CI4 R26 R25 PIO PII CI2 CI3

PCl Input Board

4/71 4-13

C3

I 01

02

CIS

R2

R5

•

CII--""'"

C2---~'----""'!-~'::-~~~~

C4 __--r~__::'-..:..:::::.-Tl-----.!.;~T--

L3--'-----.: ~__=__~_

P2

PI


CI2 L2 C6 C5 RI C7 C8 C9 CI7 CI6 1ICI4 CI3

PC2 Local Oscillator Board

4-17 4-14


CI

LI

CI C3

LI L2

PC3-----::;;:-~

PC3 and PC4 Lowpuss Filler Assembly

4/71 4-15


/

•

J2 C6 C5 54 C3

/

JI

•

C7 C8 J4 R2 RI CI C2 J3

PC5 Crystal Filter Board

4/71 4-16


RI 011 P4 P5 01 II C20

PI~

C3=-__-....:.~~ ICI - _

C2----_...;!!::--:...........i

C4

1I

TI

C9

C7

P9

C6

04

PII

RB R6 C24 C21 RIO R9 RI2 C23 R7 YI

R5

010

PI4

C33

R27

RI3

05

C25

RII

PC6 LF. Amp. Board 4/71 4-17


QIO R41

PC7 Counter Board

4/71 4-18


P3C5

L4 P4

PC8 R.F. Lowpass Filter Board

4/71 4-19


C6

i!3 PI2 i!:l Q3 PI3 BRI P3 QI FI R3 P4 P2 TI

PC9 Power Supply Board

4/71 4-20


R9 RIO RII R8 R6 R5 R4 R3 CI

AT 1 Attenuator Assembly

4/71 4-21

ALIGNMENT

IMHz CRYSTAL OSCILLATOR. PC7Q5

1. Connect counter to PC7C21 and chassis ground.

2. Turn Power Switch to Bat I position. ~

3. With a non-metalictuning tool, adjusfP£1t17 for a reading of 1,000,000Hz on counter.

250KHz CRYSTAL OSCILLATOR PC7QI

1. Connect Counter to PC7P3 and ground pin PC7P2.

2. Turn Power Switch to Bat I position.

3. With a non-metalic tuning tool, adjust PC7C5 for a reading of 250,000Hz on counter.

CALIBRATION LEVEL

1. Set the 4200 controls as follows:

(a) Input Selector to Bridge position

(b) Attenuator to -30db position

(c) Tuning to I KHz

(d) Power Switch to Bat I position

2. Adjust signal generator frequency to 1KHz.

3. Connect signal gen. to AC voltmeter and adjust output to -30db exactly.

4. Connect signal gen. output to 4200's input.

5. Adjust tuning control for maximum meter indication.

6. Adjust Cal control for a Odb meter indication.

7. Set Input Selector to Cal.

8. Remove signal generator output.

9. Adjust tuning control for maximum meter indication.

10. Adjust PCIR9 for a Odb meter indication.

I.F. AMPLIFIER. PC6

1. Set the 4200 controls as follows.

(a) Input Selector to Cal.

(b) Attenuator to -80db.

(c) Power'Switch to Bat 1 position

(d) Tune for maximum meter indication at 1KHz.

4/71 4-22

ALIGNMENT (Continued)

2. Adjust Attenuator and Cal so meter indication is between 0 and -IOdb.

3. Adjust PC6 TI, T2, & T3 with a non-metalic tuning tool for maximum meter indication.

Adjust Cal and Attenuator to keep meter on scale.

4. Recalibrate unit as per page 4-22, Steps I through 10.

LOCAL OSCILLATOR, PC2

I. Band B Alignment.

(a) Set Power Switch to Bat I position.

(b) Push Band B button in.

(c) Adjust tuning until frequency dial indicates 100KHz.

(d) Adjust PC2 CI until counter reads 100,000Hz.

(e) Set frequency dial to 10KHz.

(f) Adjust PC2 L2 until counter reads 10,000Hz.

(g) Repeat Steps c through f until counter and dial scale agree at both ends.

2. Band A Alignment.

(a) Push Band A button in.

(b) Adjust tuning until frequency dial indicates 10KHz.

(c) Adjust PC2 C6 until counter reads 10,000Hz.

(d) Set frequency dial to 500Hz.

(e) Adjust PC2 C4 until counter reads 500Hz.

(f) Repeat Steps b through e until counter and dial scale agree on both ends.

3. Band C Alignment.

(a) Push Band C button in.

(b) Adjust tuning until frequency dial indicates 200KHz.

(c) Adjust PC2 CI2 until counter reads 200,000Hz.

(d) Set frequency dial to 100KHz.

(e) Adjust PC2 CIO until counter reads 100,000Hz.

(f) Repeat Steps bthrough e until counter and dial scale agree on both ends.

COARSE BALANCE. PCI (C7 & R13)

(a) Do not apply AC power cord.

4/71 4-23

ALIGNMENT (Continued)

COARSE BALANCE. PCI (C7 & R13) (Continued)

(b) Tune 4200 to approximately 20Hz on Band A. Tune for a meter reading of around

Odb.

(c) Adjust PCI Rl3 for minimum meter reading.

(d) Tune meter for "0" again and adjust PCI C6 for minimum meter reading.

(e) Repeat steps c and d until meter reading can be reduced no lower.

(f) Adjust Rand C balance controls until meter peaked is below -20db.

4/71 4-24

SECTION Y

4200 PARTS LISTS

Components located on printed circuit boards will contain that printed circuit's number as a

prefix for the components reference symbol.

Example: PCIRI

Components located in the attenuator assembly will have as a prefix in their symbol AT 1.

Example: ATIRI

Components located on the chassis will not have a prefix as part of their reference symbol.

Example: Rl

4/71 5-1

Part Number Symbol

B02001-39 PCIRI B02001-75 PCIR2 B02001-37 PCIR3 B02001-26 PCIR4

PCIR5 B02001-31 PCIR6

PCIR7 B02001-20 PCIR8 B02009-3 PCIR9 B02001-46 PCIRIO B02001-38 PCIRII

PCIR12 PCIR13

B02008-1 PCIR14 PCIR15

A02010-6 PCIR16 PCIR17 PCIR18 PCIR19 PCIR20

B02001-25 PCIR21 B02001-35 PCIR22

PCIR23 PCIR24

B02001-23 PCIR25 PCIR26 PCIR27

BOI005-12 PCICI BOIOOO-25 PCIC2 AOI007-7 PCIC3 AOI008-16 PCIC4

PCIC5 BOIOOO-6 PCIC6 AOI013-0 PCIC7 AOI012 PCIC8

PCIC9 BOI002-31 PCICIO

PCICII

PARTS LIST

4200 PCl INPUT BOARD

Description

Resistor, Composition, 4.7K ohm ~w, 10% Resistor, Composition, 4.7M ohm ~w, 10% Resistor, Composition, 3.3K ohm ~w, 10% Resistor, Composition, 390 ohm ~w, 10% Same as PC 1R4 Resistor, Composition, lK ohm, ~w, 10% Same as PC lR6 Resistor, Composition, 120 ohm, ~w, 10% Resistor, Variable, 100 ohm Resistor, Composition, 18K ohm, ~w, 10% Resistor, Composition, 3.9K ohm, ~w, 10% Same as PCIR6 Same as PCIR9 Resistor, Film, 316 ohm, ~w, 1% Same as PCIR14 Resistor, Variable, 17 ohm Same as PCIR14 Same as PCIR14 Same as PCIRIO Same as PCIRII Resistor, Composition, 330 ohm, ~w, 10% Resistor, Composition, 2.2K ohm, ~w, 10% Same as PCIRIO Same as PClRll Resistor, Composition, 220 ohm, ~w, 10% Same as PC lR8 Same as PC lR22 Capacitor, Poly Carb, .1 mfd, 200V Capacitor, Tantalum, 100 mfd, 20V Capacitor, Tantalum, .33 mfd, 35V Capacitor, Tantalum, 22 mfd, 35V Same as PCIC3 Capacitor, Tantalum, 1 mfd. 35V Capacitor, Variable, Ceramic, 2.5 to 5.0 pfd Capacitor, Variable Piston, .8 to 8.5 pfd Same as PCIC3 Capacitor, Silver Mica, 200 pfd, DM15 Same as PCIC3

4/71 5-2

4200 PCI

Part Number Symbol

PCICl2 PCICl3 PCICl4

B04028-0 PCIQI B04011 PCIQ2

PCIQ3 PCIQ4 PCIQ5

B04030 PCIDI B04029 PCID2

PCID~j

PCID4 PCID5

A03004-1 PCILI PCIL2

A50010 PCITI A32015 PCljl

PClj2 A32009 PCIPI

PCIP2 PCIP3 PCIP4 PCIP5 PCIP6 PCIP7 PCIP8 PCIP9 PCIPIO PCIPII

6000lA PCI

INPUT BOARD (Continued)

Description

Same as PCIC3 Same as PCIC3 Same as PCIC3 Semiconductor, FET, 2N3684 Semiconductor, Transistor, 2N 3856 Same as PCIQ2 Same as PCIQ2 Same as PCIQ2 Semiconductor, Diode 1N5060 Semiconductor, Diode, HP5082-2800 Same as PCID2 Same as PC2D2 Same as PCID2 Choke, RF 5MHY Same as PC IL 1 Transformer, RF Assy. jack, Matrix Same as PC lj1 Terminal, Pin, PC Same as PCIPI Same as PCIPI Same as PCIPI Same as PCIPI Same as PCIPI Same as PC IP1 Same as PCIPI Same as PCIPI Same as PCIPI Same as PCIPI Board, P.C.

4/71 5-3

Part Number

B02001-50 B02001-30 B02001-55 B02001-63 B02001-31 B02001-27

B02001-19 B02001-43 B02001-39 B02001-35 B02001-29 AOI006 BOIOI4-7 BOIOI4-73

-BOI002-48F

BOIOI4-76

BOI002-28F

BOIOO2-44F

BOIOI4-70 BOIOI4-82 AOI007-7 BOI005-13

BOI002-16F BOI002-24F AOI007-1

B04017-1

B04011

B50031 A50028 A03004-1 A50010 B09002

4/71

4200 PC2

Symbol

PC2RI PC2R2 PC2R3 PC2R4 PC2R5 PC2R6 PC2R7 PC2R8 PC2R9 PC2RIO PC2RII PC2RI2 PC2CI PC2C2 PC2C3 PC2C4 PC2C5 PC2C6 PC2C7 PC2C8 PC2C9 PC2CIO PC2CII PC2CI2 PC2CI3 PC2CI4 PC2CI5 PC2CI6 PC2CI7 PC2CI8 PC2CI9 PC2C20 PC2C21 PC2C22 PC2QI PC2Q2 PC2Q3 PC2Q4 PC2LI PC2L2 PC2L3 PC2TI PC2S3

LOCAL OSC. BOARD

Description

Resistor, Composition, 39K ohm, ~w, 10% Resistor, Composition, 820 ohm, ~w, 10% Resistor, Composition, lOOK ohm, ~w, 10% Resistor, Composition, 470K ohm, ~w, 10% Resistor, Composition, IK ohm, ~w, 10% Resistor, Composition, 470 ohm, ~w, 10% Same as PC2R5 Resistor, Composition, 100 ohm, ~w, 10% Resistor, Composition, 10K ohm, ~w, 10% Resistor, Composition, 4.7K ohm, ~w, 10% Resistor, Composition, 2.2K ohm, ~w, 10% Resistor, Composition, 680 ohm, ~w, 10% Capacitor, Variable, Air, 2.2 - 34 pfd Capacitor, Ceramic, TC 47 pfd NPO Capacitor, Ceramic, TC 100 pfd N750 Same as PC2CI Capacitor, Silver Mica, 680 pfd HF" DM 19 Same as PC2C I Capacitor, Ceramic TC 330 pfd N750 Same as PC2C7 Capacitor, Silver Mica, 150 pfd, HF" DMI5 Same as PC2C I Capacitor, Silver Mica, 500 pfd HF" DMI5 Same as PC2C I Capacitor, Ceramic TC, 33 pfd N750 Capacitor, Ceramic TC, 68 pfd NI500 Capacitor, Tantalum, .33 mfd, 35V Capacitor, Poly Carb., .15 mfd, 200V Same as PC2CI5 Capacitor, Silver Mica, 50 pfd DM 15 Capacitor, Silver Mica, 100 pfd, DMI5 Capacitor, Tantalum, .1 mfd, 35V Same as PC2CI5 Same as PC2C20 Semiconductor, FET, 2N3822 Same as PC2Q I Semiconductor, Transistor, NPN, 2N3856 Same as PC2Q3 Inductor, Tapped Assy. Inductor, Variable Assy. Choke, RF, 5 mhy Transformer, R.F. Assy. Switch, Push-Button, 3 section

5-4

4200 PC2 LOCAL OSC. BOARD (Continued)

Part Number

A32009

60002A

Symbol

PC2Pl PC2P2 PC2P3 PC2P4 PC2P5 PC2P6 PC2P7 PC2

Description

Terminal, Pin, PC Same as PC2Pl Same as PC2Pl Same as PC2P1 Same as PC2Pl Same as PC2Pl Same as PC2P1 Board, Printed Circuit

4/71 5-5

4200 PC3 & PC4 LOW PASS FILTER BOARDS

Part Number Symbol

BOI002-52 PC3Cl BOI002-54 PC3C2 A50036 PC3Ll A50037 PC3L2 60003A PC3

BOI002-55 PC4Cl BOI002-54 PC4C2 BOI002-52 PC4C3 A50037 PC4Ll A50036 PC4L2 60004A PC4

Description

Capacitor, Silver Mica, 1000 pfd, DM 19 Capacitor, Silver Mica, 1200 pfd, DM19 Inductor, Variable, Assy. Inductor, Variable, Assy. Board, Printed Circuit

Capacitor, Silver Mica, 1300 pfd, DM19 Capacitor, Silver Mica, 1200 pfd, DM19 Capacitor, Silver Mica, 1000 pfd, DM19 Inductor, Variable, Assy. Inductor, Variable, Assy. Board, Printed Circuit

4/71 5-6

4200 PC5 CRYSTAL FILTER BOARD

Part Number

B02001-47 B02001-23 BOI002-16 AOI009

B50032 A32015

60005A

Symbol

PC5RI PC5R2 PC5CI PC5C2 PC5C3 PC5C4 PC5C5 PC5C6 PC5C7 PC5C8 PC5S4 PC5JI PC5J2 PC5J3 PC5J4 PC5

Description

Resistor, Composition, 22K ohm, ~w, 10% Resistor, Composition, 220 ohm, ~w, 10% Capacitor, Silver Mica, 50 pfd, DMI5 Capacitor, Variable, Ceramic 9-35 pfd Same as PC5C1 Same as PC5C 1 Same as PC5C 1 Same as PC5C 1 Same as PC5C 1 Same as PC5C1 Switch, Wafer, Rotary, 2 position Jack, Matrix Same as PC5JI Same as PC5J1 Same as PC5JI Board, Printed Circuit

4/71 5-7

4200 PC6 I.F. AMPLIFIER BOARD

Part Number

B0200I-30 B0200I-23 B02002-86 B0200I-3I

B0200I-48 B0200I-4I B0200I-46

B0200I-38

B0200I-43 B0200I-39

B0200I-49 B0200I-50 B0200I-52 B0200I-44

- B0200I-27 B0200I-47 B0200I-45 AOI007-7

BOI002-40

-

L-

AOIOII-O AOI003-0

I-

BOI002-44

4/71

Symbol

PC6RI PC6R2 PC6R3 PC6R4 PC6R5 PC6R6 PC6R7 PC6R8 PC6R9 PC6RIO PC6RII PC6RI2 PC6RI3 PC6RI4 PC6RI5 PC6RI6 PC6RI7 PC6RI8 PC6RI9 PC6R20 PC6R2I PC6R22 PC6R23 PC6R24 PC6R25 PC6R26 PC6R27 PC6R28 PC6CI PC6C2 PC6C3 PC6C4 PC6C5 PC6C6 PC6C7 PC6C8 PC6C9 PC6CIO PC6CII PC6CI2 PC6CI3 PC6CI4 PC6CI5 PC6CI6 PC6CI7 PC6CI8 PC6CI9 PC6C20 PC6C2I PC6C22 PC6C23

Description

Resistor, composition, 820 ohm, %w, 10% Resistor, Composition, 220 ohm, %w, 10% Resistor, Composition, 4.3K ohm, %w, 5% Resistor, Composition, IK ohm, %w, 10% Same as PC6R I Same as PC6R4 Same as PC6R2 Same as PC6R I Resistor, Composition, 27K, %w, 10% Resistor, Composition, 6.8K ohm, %w, 10% Resistor, Composition, 18K ohm, %w, 10% Same as PC6R4 Same as PC6R I Same as PC6RII Resistor, Composition, 3.9K ohm, %w, 10% Same as PC6R4 Same as PC6R4 Resistor, Composition, 10K ohm, %w, 10% Resistor, Composition, 4.7K ohm, %w, 10% Same as PC6R19 Same as PC6R 19 Resistor, Composition, 33K ohm, %w, 10% Resistor, Composition, 39K ohm, %w, 10% Resistor, Composition, 56K ohm, %w, 10% Resistor, Composition, 12K ohm, %w, 10% Resistor, Composition, 470 ohm, %w, 10% Resistor, Composition, 22K ohm, %w, 10% Resistor, Composition, 15K ohm, %w, 10% Capacitor, Tantalum, .33 mfd, 35V Same as PC6CI Same as PC6CI Capacitor, Silver Mica, 390 pfd, DMI5 Same as PC6C I Same as PC6C I Same as PC6C I Same as PC6C I Same as PC6C I Same as PC6C4 Same as PC6CI Same as PC6C I Same as PC6CI Same as PC6C I Same as PC6C4 Same as PC6C I Same as PC6CI Same as PC6CI Capacitor, Electrolytic, 100 mfd, 25V Capacitor, Electrolytic, 5 mfd, 25V Same as PC6CI Same as PC6C I Capacitor, Silver Mica, 500 pfd, DMI5

5-8

4200 PC6 I.F. AMPLIFIER BOARD (Continued)

Part Number

BOI002-24 BOI005-6

~ AOI007-1

AOI008-16

A04019

B04004

B04011 B04017-1

A04022 A04016-2 A04015-2 A04020-1

~

A04020-0 A04025

A04021-0 B04018-11A A03004-1

A03003-33

B50006 B50039

A15000-3

4/71

Symbol

PC6C24 PC6C25 PC6C26 PC6C27 PC6C28 PC6C29 PC6C30 PC6C31 PC6C32 PC6C33 PC6C34 PC6C35 PC6C36 PC6C37 PC6ICI PC6IC2 PC6IC3 PC6Ql PC6Q2 PC6Q3 PC6Q4 PC6Q5 PC6Q6 PC6Q7 PC6Q8 PC6Q9 PC6QI0 PC6Qll PC6Q12 PC6Dl PC6D2 PC6D3 PC6D4 PC6BRI PC6Z1 PC6Ll PC6L2 PC6L3 PC6L4 PC6L5 PC6Tl PC6T2 PC6T3 PC6Yl

Description

Same as PC6C1 Capacitor, Silver Mica, 100 pfd, DM15 Capacitor, Poly Carb, .01 mfd, 200V Same as PC6Cl Capacitor, Tantalum, .1 mfd, 35V Same as PC6C28 Same as PC6C26 Capacitor, Tantalum, 22 mfd, 35V Same as PC6C19 Same as PC6C1 Same as PC6C31 Same as PC6C31 Same as PC6C31 Same as PC6C 19 Semiconductor, Integrated CKT, MC1550 Same as PC6ICI Same as PC6ICI Semiconductor, Transistor, 2N696 Same as PC6Q1 Semiconductor, Transistor, 2N3856A Semiconductor, FET, 2N3822 Same as PC6Q3 Same as PC6Q3 Same as PC6Q3 Semiconductor, Transistor, 2N3638 Semiconductor, Transistor, 2N 1306 Semiconductor, Transistor, 2N1307 Semiconductor, Transistor, 2N5811 Semiconductor, Transistor, 2N5810 Semiconductor, Diode, IN277 Same as PC6D1 Same as PC6D1 Same as PC6Dl Semiconductor, Bridge, Full Wave FWL50 Semiconductor, Diode, Zener, IN4739A Choke, R.F. 5mhy Same as PC6L1 Same as PC6Ll Inductor, Shielded, 56 uhy Same as PC6Ll Transformer, I.F. Assy. Transformer, I.F. Assy. Same as PC6Tl Crystal, Quartz, 249KHz

5-9

4200 PC6 I.F. AMPLIFIER BOARD (Continued)

Part Number

A32009

60006A

Symbol

PC6Pl PC6P2 PC6P3 PC6P4 PC6P5 PC6P6 PC6P7 PC6P8 PC6P9 PC6PI0 PC6Pll PC6P12 PC6P13 PC6P14 PC6P15 PC6

Description

Terminal, Pin, PC Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Same as PC6P2 Board, Printed Circuit

4/71 5-10

4200 PC7 COUNTER BOARD

Part Number Symbol

B02001-14 PC7Rl B02001-45 PC7R2 B02001-41 PC7R3 B02001-46 PC7R4 B02001-31 PC7R5 B02001-30 PC7R6 B02001-43 PC7R7 B02001-39 PC7R8

PC7R9 PC7RI0 PC7Rll

B02001-35 PC7R12 PC7R13

B02001-33 PC7R14 PC7R15 PC7R16

B02001-38 PC7R17 B02001-37 PC7R18 B02001-29 PC7R19 B02001-53 PC7R20

PC7R21 B02001-25 PC7R22 B02001-50 PC7R23

PC7R24 B02001-19 PC7R25 B02001-36 PC7R26 B02001-32 PC7R27 B02001-40 PC7R28

PC7R29 PC7R30 PC7R31 PC7R32 PC7R33 PC7R34 PC7R35 PC7R36 PC7R37 PC7R38

B02001-53 PC7R39 PC7R40 PC7R41

AOI007-7 . PC7Cl

4/71

Description

Resistor, Composition, 39 ohm, Y:!w, 10% Resistor, Composition, 15K ohm, Y:!w, 10% Resistor, Composition, 6.8K ohm, Y:!w, 10% Resistor, Composition, 18K ohm, Y:!w, 10% Resistor, Composition, lK ohm, Y:!w, 10% Resistor, Composition, 820 ohm, Y:!w, 10% Resistor, Composition, 10K ohm, Y:!w, 10% Resistor, Composition, 4.7K ohm, Y:!w, 10% Same as PC7R5 Same as PC7R8 Same as PC7R7 Resistor, Composition, 2.2K, Y:!w, 10% Same as PC7R12 Resistor, Composition, 1.5K ohm, Y:!w, 10% Same as PC7R14 Same as PC7R4 Resistor, Composition, 3.9K ohm, Y:!w, 10% Resistor, Composition, 3.3K ohm, Y:!w, 10% Resistor, Composition, 680 ohm, Y:!w, 10% Resistor, Composition, 680K ohm, Y:!w, 10% Same as PC7R3 Resistor, Composition, 330 ohm, Y:!w, 10% Resistor, Composition, 39K ohm, Y:!w, 10% Same as PC7R23 Resistor, Composition, 100 ohm, Y:!w, 10% Resistor, Composition, 2.7K ohm, Y:!w, 10% Resistor, Composition, 1.2K ohm, Y:!w, 10% Resistor, Composition, 5.6K ohm, Y:!w, 10% Same as PC7R3 Same as PC7R7 Same as PC7R12 Same as PC7R3 Same as PC7R3 Same as PC7R28 Same as PC7R22 Same as PC7R28 Same as PC7R22 Same as PC7R3 Resistor, Composition, 68K, Y:!w, 10% Same as PC7R3 Same as PC7R22 Capacitor, Tantalum, .33 mfd, 35V

5-11

4200 PC7 COUNTER BOARD (Continued)

-Part Number Symbol Description

BOI002-75 PC7C2 Capacitor, Silver Mica, 600 pfd, DM 19 BOI005-6 PC7C3 Capacitor, Poly Carb, .01 mfd, 200V BOI002-8 PC7C4 Capacitor, Silver Mica, 25 pfd, DM 15 AOI009 PC7C5 Capacitor, Variable, Ceramic, 9-35 pfd BOI002-24 PC7C6 Capacitor, Silver Mica, 100 pfd, DM15

PC7C7 Same as PC7Cl PC7C8 Same as PC7Cl PC7C9 Same as PC7Cl PC7CI0 Same as PC7Cl

- BOI005-2 PC7Cll Capacitor, Poly Carb, .0022 mfd, 200V AOI0II-0 PC7C12 Capacitor,"Electrolytic, 100 mfd, 25V AOI008-16 PC7C13 Capacitor, Tantalum, 22 mfd, 35V

PC7C14 Same as PC7Cl PC7C15 Same as PC7C13

BOI002-11 PC7C16 Capacitor, Silver Mica, 33 pfd, DM15 BOI0I0 PC7C17 Capacitor, Variable, Piston, .8 - 8.5 pfd BOI002-38 PC7C18 Capacitor, Silver Mica, 350 pfd, DM15

PC7C19 Same as PC7C2 I

L. PC7C20 Same as PC7C1 BOI005-46 PC7C21 Capacitor, Poly Carb, .02 mfd, 200V AOI0ll-11 PC7C22 Capacitor, Electrolytic, 500 mfd, 15V

'- PC7C23 Same as PC7C3 BOI005-0 PC7C24 Capacitor, Poly Carb, .001 mfd, 200V B04010 PC7ICl Semiconductor, I.C. CA3005 B04008 PC7IC2 Semiconductor, I.C. MC724 B04009-0 PC7IC3 Semiconductor, I.C. SN7490

PC7IC4 Same as PC7IC3 PC7IC5 Same as PC7IC3 PC7IC6 Same as PC7IC3 PC7IC7 Same as PC7IC3

L.

PC7IC8 Same as PC7IC3 B04006 PC7IC9 Semiconductor, I.C. MC789 B04005 PC7ICI0 Semiconductor, I.C. MC790 C04007 PC7ICll Semiconductor, I.C. MEMI056

PC7IC12 Same as PC7ICll PC7IC13 Same as PC7ICll PC7IC14 Same as PC7ICll PC7IC15 Same as PC7ICll PC7IC16 Same as PC7ICll

B04011 PC7Ql Semiconductor, Transistor, 2N 3856 PC7Q2 Same as PC7Ql PC7Q3 Same as PC7Ql PC7Q4 Same as PC7Ql

4/71 5-12

4200 PC7 COUNTER BOARD (Continued)

Part Number SYInbol

PC7Q5 PC7Q6 PC7Q7 PC7Q8 PC7Q9

A04012-0 PC7QI0 A03004-1 PC7Ll A03003-33 PC7L2

PC7L3 A15000-0 PC7Yl A15000-1 PC7Y2 A08001-0 PC7Vl

PC7V2 A08001-1 PC7V3

PC7V4 PC7V5 PC7V6

A32010-2 A32009 PC7Pl

PC7P2 PC7P3 PC7P4 PC7P5 PC7P6 PC7P7 PC7P8 PC7P9 PC7PI0 PC7Pli PC7P12 PC7P13 PC7P14

60007A PC7

Description

Same as PC7Q 1 Same as PC7Ql Same as PC7Q 1 Same as PC7Q 1 Same as PC7Ql Semiconductor, Transistor, 2N3905 Choke, R.F. 5 mhy Inductor, Shielded, 56 uhy Same as PC7Ll Crystal, Quartz, 250KHz Crystal, Quartz, IMHz Tube, Readout, DT-1704 Same as PC7Vl Tube, Readout, DT-1705 Same as PC7V 1 Same as PC7V 1 Same as PC7V 1 Socket, Miniature, Spring Terminal, Pin P.C. Same as PC7Pl Same as PC7Pl Same as PC7Pl Same as PC7Pl Same as PC7Pl Same as PC7Pl Same as PC7Pl Same asPC7Pl Same as PC7Pl Same as PC7Pl Same as PC7P1 Same as PC7Pl Same as PC7P1 Board, Printed Circuit

4/71 5-13

4200 PC8 RESTORED FREQ LOW PASS FILTER BOARD

Part Number

BOI002-52 BOI002-54 BOI002-55

A50036 A50037

A32009 '-

60008A

Symbol

PC8Cl PC8C2 PC8C3 PC8C4 PC8C5 PC8Ll PC8L2 PC8L3 PC8L4 PC8Pl PC8P2 PC8P3 PC8P4 PC8

Description

Capacitor, Silver Mica, 1000 pfd, DM19 Capacitor, Silver Mica, 1200 pfd, DM19 Capacitor, Silver Mica, 1300 pfd, DM19 Same as PC8C2 Same as PC8C1 Inductor, Variable, Assy. Inductor, Variable, Assy. Same as PC8L2 Same as PC8Ll Terminal, Pin, P.C. Same as PC8Pl Same as PC8Pl Same as PC8Pl Board, Printed Circuit

4/71 5-14

4200 PC9 POWER SUPPLY BOARD

Part Number Symbol

B02007-84 PC9Rl B02001-51 PC9R2 B02001-27 PC9R3 B02007-1 PC9R4 B02001-30 PC9R5 AOI0ll-ll PC9Cl, CIA

PC9C2 AOI011-3 PC9C3

PC9C4 AOI011-29 PC9C5 AOI003-1 PC9C6 A04.027 PC9Ql

PC9Q2 A04022 PC9Q3 A04023-0 PC9Dl

PC9D2 PC9D3

A04026-0 PC9BRI B04024-9 PC9Z1 B04018-3A PC9Z2 B04,018-15A PC9Z3 B50029 PC9Tl AI0001-27 PC9Fl AI0001-24 PC9F2 A32009 PC9Pl

PC9P2 PC9P3 PC9P4 PC9P5 PC9P6 PC9P7 PC9P8 PC9P9 PC9PI0 PC9Pll PC9P12 PC9P13 PC9P14 PC9P15

A32015 A32020 A21035-0 60009A PC9

4/71

Description

Resistor, B W H., .27 ohm, lw., 10% Resistor,·Composition, 47K ohm, ~w, 10% Resistor, Composition, 470 ohm, ~w, 10% Resistor, B.W H, 3.3 ohm, lw, 10% Resistor, Composition, 820 ohm, ~w, 10% Capacitor, Electrolytic, 500 mfd, 15V Same as PC9Cl Capacitor, Electrolytic, 250 mfd, 25V Same as PC9C3 Capacitor, 200 mfd, 35V Capacitor, Electrolytic, 25 mfd, 25V Semiconductor, Transistor, 2N3054 Same as PC9Ql Semiconductor, Transistor, 2N3638 Semiconductor, Diode, IN2069 Same as PC9D1 Same as PC9D1 Semiconductor, Bridge, Full Wave FWLB50 Semiconductor, Diode, Zener, IN3997AR Semiconductor, Diode, Zener, IN4731A Semiconductor, Diode, Zener IN4743A Transformer, Inverter, Assy. Fuse, 3 AGC Slo Blo Fuse, 2 AGC Slo Blo Terminal, Pin, PC Same as PC9Pl Same as PC9Pl Same as PC9Pl Same as PC9Pl Same as PC9Pl Same as PC9Pl Same as PC9Pl Same as PC9Pl Same as PC9Pl Same as PC9P1 Same as PC9Pl Same as PC9Pl Same as PC9Pl Same as PC9P1 Jack, Matrix Clips, Fuse Heat Sink, Winged Board, Printed Circuit

5-15

4200 AT1 ATTENUATOR ASSEMBLY

Part Number

B02008-10 B02008-1 B02008-7 B02008-8 B02008-9

B02008-11 B02008-6 B02008-4 B02008-3 B01002-1 B09005

Symbol

AT1R1 AT1R2 AT1R3 AT1R4 AT1R5 AT1R6 AT1R7 AT1R8 AT1R9 AT1R10 AT1R11 AT1R12 AT1C1 AT1S2

Description

Resistor, Film, lOOK ohm, ~w, 1% Resistor, Film, 316 ohm, ~w, 1% Resistor, Film, 68.1K ohm, ~w, 1% Resistor, Film, 90.9K ohm, ~w, 1% !

Resistor, Film, 9'7.6K ohm, ~w, 1% Same as AT1R1 Same as AT1R1 Same as AT1R2 Resistor, Film, 31.6K ohm, ~w, 1% Resistor, Film, 10K ohm, ~w, 1% Resistor, Film, 3.16K ohm, ~w, 1% Resistor, Film, 1K ohm, ~w, 1% Capacitor, Silver Mica, 10 pfd, DM15 Switch, Rotary

4/71 5-16

4200 MISCELLANEOUS PARTS

Part Number

B09006 B50034 A09004 A09003 A27002-0 B17000 A32006-1 A32006-0 B08002 A18000 B15002 B15001 B02005-0 B02001-31 A02012 A02011 BOI005-22 A16001 A32016 A23000 A23001 A12006 A27004 A27003 A27005 C50035 C28000

Symbol

SI ATI S5 S6

Bl BPI BP2 Ml LSI FLI FL2 Rl R2 R3 R4 Cl Tl Jl

Description

Switch, Rotary, Input Attenuator Assembly Switch, Rotary, Power Switch, Toggle, Mode Cap, Switch Battery, 4.8V, 7 AHR Post, Binding, Red Post, Binding, Black Meter, 100UA Speaker, Round, 2%", 45 ohm Filter, Crystal 25Hz Filter, Crystal 250Hz Resistor, Film, 604 ohm, %w, 1% Resistor, Composition, lK ohm, %w, 10% Resistor, Variable, 5K ohm Resistor, Variable, 25K ohm, Audio Taper Capacitor, Poly Carbo 4.0 mfd, 200V Tr~nsformer, Power Receptacle, 3 prong Window, Counter, Plexiglas, Circular Polarized Window, Freq., Plexiglas, Scribed Cord, Power, 3 conductor Knob, Bar, Black Knob, Spinner, Black Knob, Round, Black Tuning, Gear Train, Assy. Case, Portable

4/71 5-17

Harmon 4200A Selective Voltmeter Instruction Manual - April 1974

Documents

Transcript of Harmon 4200A Selective Voltmeter Instruction Manual - April 1974