Zenith MC7031, MC7041, MC7051 Service Manual

SERVICE MANUAL

MODELS

HF-46

22.8M-CPC

STEREO RECEIVERS

MC7031, MC7041,

ZENITH

PARTS

11000 SEYMOUR AVENUE. FRANKLIN PARK. ILLINOIS

RADIO CORPORATION

AND SERVICE DIVISION

JUNE,

PRINTED

1980

IN

U.S.A.

MC7051

MODEL MC7051

ILLUSTRATED

60131

$4.00

923-972

To the Service Technician

PRODUCT

CAUTION: Service work should familiar lines. injury

No

with

To

do

to the

SAFETY

modification

all

of

the otherwise increases user.

of any

be

performed only

following safety checks

SERVICING GUIDELINES

the

SAFETY CHECKS

SUBJECT: Fire & Shock Hazard

1.

Be

sure that to avoid possibility is especially important ported

2 Always replace

and barriers after working

3. Check cord. and replace

4

All

fuses

of

the agrams Zenith types

5 After re-assembly

age test such set

is

all

components

of

adjacent components shorts. This

on

those chassis which

to and

from

the

repair shop.

all

protective devices such

on a

for

frayed insulation

Also check across-the-line components

if

necessary.

and

certain resistors

flameproof type (shaded

and

parts lists) must

to

prevent potential fire hazard.

of the set

on the

as the

safe

exposed metallic parts

knobs, antenna terminals,

to

operate without danger

circuit should

after

risk

of

are

positioned

receiver.

on

wires including

and

on the

be

replaced with exact

always perform

be

you

and

servicing guide-

potential

in

capacitors which

schematic

of the

etc. to be

of

electrical shock.

attempted.

are

thoroughly

hazards

such

are

as

insulators

the AC

for

damage

an AC

cabinet

sure

FOR ALL

and

a way

trans-

are di-

leak-

the

AUDIO AMPLIFIERS

Do

not use a

an

AC sitivity watt resistor, (63-10401-76) paralleled type capacitor (22-4384) between a known good earth ground (water pipe, conduit, lic parts, the combination itor. Reverse age measurements age measured must responds limit constitutes a potential shock hazard corrected immediately.

line isolation transformer during this test.

voltmeter having 5000 ohms

in the

following manner: Connect

one at a

to 0.5

good earth ground such

as the

pipe,

conduit,

time. Measure

1500 ohm

the AC

milliamp

water

etc.

AND

RADIO RECEIVERS

per

volt

or

more

a 1500 ohm 10

by a .15 mfd, AC

etc.) and the

the AC

resistor

plug

on the set and

for

each exposed metallic part. Volt-

not

exceed

0.75

AC. Any

AC VOLTMETER

exposed metal-

voltage across

and .15 mfd.

repeat

volts

RMS.

value exceeding this

and

place this probe on each exposed metallic part.

Use

sen-

capac-

AC

volt-

This cor-

must

be

TABLE

OF

Safety Servicing Guidelines and Technical Applications Index Inside Front Cover Index Product Features Pages

Record Changer Features Page Tape Unit Features Page Introduction Page Product Features Page

General Information Page Alignment Procedures Pages Disassembly Pages Theory Parts Lists Pages 24-36 Integrated Circuit Block Diagrams Pages Schematic, Related Drawings and Exploded Views Pages 43-60

CONTENTS

to

Schematics and Related Drawings Page

and

Application Pages 20-22

1

2-5

6 7 8 9

10 11-15 16-19

38-41

TECHNICAL APPLICATIONS INDEX Various introduced into Such information has been included

HF

HF HF

"HF"

series service manuals contain information relating

our

products.

18:

Theory - Diodes (Including Zener and SCR), Transistors, (PNP, NPN, Darlington, and JFET). Applications - Chassis 29AT24 (JFET FM-RF,

Multiplex, Electronic Touch Switching), Complementary Symmetry, Chassis 11ZT27 (Electronic Filter).

22:

Theory - JFET, IGFET, MOSFET, Applications - Dual Gate MOSFET FM-RF, JFET Biplex Detector, Quasi-Complementary Symmetry.

HF

23:

Applications - Model C9029/Chassis 15WCA10 Four Channel Decoder.

HF

26:

Applications - Chassis 15WDR51 (JFET Meter Circuit, Multiplex

HF

27:

Applications - Model SD2568 Speaker Switching Circuitry.

28:

Applications - Model D9013W Allegro Speaker System.

29:

Theory — Light Emitting Diodes (LED). Applications - Three Light Tuning (Target Tuning), Multiplex HF 29S1: Applications — Snap-off Escutcheon HF

30:

Applications — Snap-off Escutcheon HF 31: Theory

HF 32S2: Applications - Four Channel Sound Reproduction Input

HF

32:

HF33:

Theory

HF 33S1: Applications — "J" Line Allegro Speaker System Repair Procedures. HF

34:

HF

39:

and

General Product Information — Audio Circuitry (including

Procedures.

Inter Changeability, Chassis 12WGR59 Accessibility.

Applications

Line Allegro Speaker Systems and Repair Procedures.

General Product Information — Audio Circuitry (including Output

Applications —

Applications

Applications - Chassis 12WGR59 (Ceramic Filters,

- "H"

and

Applications - Chassis 3WJR52 (Ceramic Filters,

"K"

- "K"

In

addition, service procedures

in the

following service manuals:

and Out

Line Disassembly Procedures, Part Number Identification, Record Changer

Line Allegro Speaker Systems

Front Chassis Removal,

Vs.

and

Repair Procedures. General Product Information.

and

Repair Procedures.

to

solid state device theory, operation

are

also explained,

IC,

Four Channel Decoding).

"E"

Line Models.

"F"

IF IC,

Two on Two

Output, Repairing Push Button Switches, Record Changer

IF IC's for AM and FM

Line Models.

Quadrature Detector, Interstation Muting,

Speaker Matrix, Allegro Speaker Systems),

IC),

"J" Line Disassembly Procedures.

if

required,

Quadrature Detector,

in the

IC.

and

Phono Cartridge Inter

and

appropriate service manuals.

circuit applications

PLL

Multiplex

"G"

Line Disassembly

and

Phono Cartridge

Changeability,

PLL

Multiplex

IC,

as

Audio).

"H"

Audio).

INDEX

*REFER TO MASTER INDEX FOR UPDATED INFORMATION

CHASSIS

OR MODEL ON PAGE CONTAINED IN OR MODEL

1WEA10 (Z1) 1WEA11 (Z1) 1WGR50 1WJR55

3WEA10 (ZD

3WGR50 3WHR50 3WJR50,50Z 3WJR51,51Z 3WGR52 3WHR52 3WJR52,52Z 3WGR54 3WR10X 3WR11X 3WR12X 5WER50 5WFR50 5WER51

5WFR51 5WER52 5WER52Z1 5WER52Z2 5WER52Z3 5WER53 5WFR53 6WGR55 6WHR55 6WGR56 6WHR56 6WGR57 6WHR57 6WGR90 6WGR91 8WJR56 8WJR57

12WGR58

12WGR59

12WHR29

15WJR29

15WEA10

15WFR51

15WER55

15WFR55

15WER56 15WFR57

35WFR50 G1000W H1000W,W1,W2,W3 J1000W1,W2 G2000W G2000W11 H2000W,W3 J2000W1,W2 G3000W G3000W11 H3000W,W3

HF 28S1 is Part No. 923-734 HF30 is Part No. 923-809 HF31S2 is Part No. 923-864 HF33S1 is Part No. 923-921 HF34 is Part No. 923-927 HF 37 is Part No. 923-942 HF 38 is Part No. 923-943 HF 39 is Part No 923-944 HF40 is Part No. 923-945

HF41 is Part No. 923-962

HF45 is Part No. 923-971 HF46 is Part No. 923-972

INFORMATION

-

PRIOR DATA

HF

28S1,

29, 30

HF

28S1,

29, 30 HF 31S1.31S2 HF 33, 33S1 HF 29, 29S2, 30 E9014X (1) HF 31.31S1 HF 32, 32S1 HF 33,

33S1,

34 G9019W HF 33, 33S1 E9026W HF

31,

31S1 HF32S1 HF 33.33S1 HF

31,

32S1 HF40,

47 HF40.47 HF40,

47 HF 28S1,29,29S1,30,30S1 HF 30,

31S1,

31 HF 29, 29S1, 30,30S1 IS4061-2 HF 30.30S1 HF 29S2, 30, 30S1 HF 30, 30S1 HF 30, 30S1 HF 30, 30S1 IS4081-1 HF 29,

29S1,

30 IS4081-2 HF 30, 30S1 HF

31,

31S1 HF 32, 32S1 MC1000-11 HF 31,31S1 MC1000-12 HF 32, 32S1

HF

31,

31S1 MC2000-11

HF 32.32S1 MC2000-12 HF 31S1 HF 31S2 HF 33 HF 33 HF

31,

32S1 MC4000-11

HF

31,

31S1 MC4000-12

HF 32, 32S1 HF 33,

33S1,

34

HF

29S1,

30 MC6060 HF 30, 30S1 MC6060-1 HF 29,29S1,29S2,30,30S1 MC6065 HF 30, 30S1 HF 29, 29S1, 29S2, 30 HF 30, 30S1 HF 30,

30S1,

32S1 HF31./31S1 HF 32 HF33 HF

31,

31S1 HF 31S1 HF 32 HF 33 HF 31,31S1 HF 31S1 HF 32

HF 29 is Part No. 923-740 HF 29S1 is Part No. 923-762 HF 30S1 is Part No. 923-841 HF 31 is Part No. 923-848 HF32 is Part No. 923-874 HF 32S1 is Part No. 923-895

HF42 is Part No. 923-966

CHASSIS INFORMATION PRIOR DATA

J3000W1

E9012W (1) G9012W1 E9014W (1)

G9014W E9018WO)

E9029W

IS4020 IS4021 IS4030

IS4031 IS4040 IS4041 IS4060 IS4061-1

IS4070 IS4071-1 IS4071-2 IS4080

IS4081-3 MC1000

MC2000

MC3000 MC3000-11 MC3000-12 MC4000

MC6010 MC6020

MC7030 MC7031 MC7040 MC7041 MC7050 MC7051 8 to 60 MC9020 MC9025 MC9030 MC9035 MC9040 MC9050 MC9070 MC9070-1

HF 35 is Part No. 923-933

HF43 is Part No. 923-967 HF 47 is Part No

ON PAGE

8 to 60

927973 HF 48 is Part No. 923-974

—

-

—

-

_

_ _

-

- -

-

- -

-

- -

-

HF 33 HF HF HF HF HF 31S1 HF HF 31.31S1 HF 30S1 HF 29S1

HF35 HF41 HF35 HF41 HF35 HF41 HF36 HF42 HF43 HF36 HF42 HF43 HF36 HF42 HF43 HF44 HF39 HF39

HF 39

HF39

HF 39

HF37

HF45

HF 37

HF37S1 HF45

HF 38

RC 28

RC33

RC 29

RC 34 RC30 RC37

TR 41 TR 41S1

HF29S2 is Part No. 923-784 HF 31S1 is Part No. 923-857 HF 33 is Part No. 923-901 HF 36 is Part No. 923-934

HF44 is Part No. 923-970

CONTAINED IN

29S1,

30

31,

31S1

29S1,

30

29S1,

30

29S1,

30

-

1

PRODUCT

FEATURES

CABINET

MODEL

IS4021

IS4031 Walnut

IS4041

IS4061-1

IS4061-2

IS4071-1

IS4071-2

IS4081-1

IS4081-2

IS4081-3

IS4090

L900P

LR902P

LR902P1

LR912AE

LR915P

COLOR

Walnut

Pecan

Antique Oak

Pecan

STYLE

NOTE

M, D

C, LL

•

REFER

MODEL TYPE

A

3WR10X AM/FM/FM

3WR11X AM/FM/FM

3WR11X

3WR11X AM/FM/FM

3WR11X

TO

CHASSIS SPEAKERS

-

—

AM/FM/FM Stereo/Phono/ Tape

Stereo/Phono/ Tape

AM/FM/FM Stereo/Phono/ Tape

Stereo/Phono/ Tape

AM/FM/FM Stereo/Phono/ Tape

SEE NOTES

PAGE

ONE

INDEX

NUMBER

49-1153-02 49-1094-01

49-1261-02 49-1251-02

PART

Note

FOR

D2

ON

IMPED.

Ohms)

PAGE

MODELS

AND

(In

-

—

16

45

16

45

16

45

8 8

5

IN

THIS MANUAL

RECORD

CHANGER

QTY.

Inches)

-

—

2-6x9 2-31/

2-6x9 2-3 %

2-6x9 2-31/

2-8 2-3

SIZE

2

NUMBER

NOTE

169-573

169-579

169-573-01

169-581

PART

B

•

OTHER FEATURES

TAPE

PROVISION

NOTE

8TK-R/P 969-51

CASS-R/P 969-52

CASS-R/P 969-52 8TK-R/P 969-51

8TK-R/P 969-55

8TK-R/P 969-51

CASS-R/P 969-56

CASS-R/P 969-56 8TK-R/P 969-55

CASS-R/P 969-56 8TK-R/P 969-51

CASS-R/P A-8051 8TK-R/P A-7021

CASS-R/P 969-62

8TK-P 969-60

8TK-R/P 969-51

PROVISION

C

SPEAKER

NOTE A1,

A2,

SPKAB

A1,

A2,

SPKAB

A1,

A2,

SPKAB

A1,

A2,

A3,

A4,

SPKOAB

A1,

A2,

A3,

A4,

SPKOAB

A1,

A2,

A3,

A4,

SPKOAB

A1,

A2,

A3,

A4,

SPKOAB

A1,

A2,

A3,

A4,

SPKOAB

A1,

A2,

A3,

A4,

SPKOAB

A1,

A2,

A3,

A4,

SPKOAB

A1,

A2,

A3,

A4,

SPKOAB

A1,

A2,

SPK

A1,

A2,

SPK

A1,

A2,

SPK

A1,

A2,

SPK

A1,

A2,

SPK

NOTE

D

AUX, DL, H, HIF, TO

AUX, DL, F, H, HIF, LD,

LOF,

MU, AUX, DL, F,

H, HIF, LD, LOF, MU,T, TO

AUX, DL, F, H, HIF, LD, LOF, MU,T, TO

AUX, DL, F, H, HIF, LD, LOF, MU,

AUX, DL, F, H, HIF, LD, LOF, MU,T,TO

AFC, DL,

H, HIF,

T,TO

AFC, DL,

H, HIF,

RS,

T, TO

AFC, DL,

H, HIF,

RS,T,TO A, AFC,

AUX, DL, H, HIF, TO

A, AFC, AUX, DL, H, HIF, TO

MISC.

E

LD, T,

MS,

T, TO

MS,

T, TO

MS,

AUX,

RS,T,

2

PRODUCT

FEATURES

CABINET

MODEL

LR915P1 Pecan

LR915P2

LR916PN Pine

LR916PN1

LR917M Pecan

LR919P

LR919P1 Pecan

LR920AE

MC1000 Walnut

MC1000-11

MC1000-12 Walnut

MC2000 Walnut

MC2000-11 Walnut

MC2000-12 Walnut

MC3000 Walnut

MC3000-11 Walnut

MC3000-12 Walnut

COLOR

Pecan

Pine

Pecan

Antique Oak

Walnut

STYLE

NOTE

C,

LL

C,

LL

C,

LL

C,

LL

C,

LL

C,

LL

C,

LL

C,

LL

M, SP

M,

SP

M,

SP

M,

SP

M,

SP

M,

SP

M,

SP

•

REFER

MODEL

A

3WR11X AM/FM/FM

3WR11X

3WR11X AM/FM/FM

3WR12X AM/FM/FM

3WR12X

TO

CHASSIS

Stereo/Phono/ Tape

AM/FM/FM Stereo/Phono/ Tape

Stereo/Phono/ Tape

AM/FM/FM Stereo/Phono/ Tape

—

— —

—

SEE NOTES

PAGE

ONE

TYPE

—

INDEX

NUMBER

49-1261-02 49-1251-02

49-1261-02

49-1251-02

49-1261-02 49-1251-02

49-1217-01 49-1166-01

49-1277 49-1278

49-1277 49-1278-02

49-1277 49-1278

49-1293 49-1261-02

49-1166-01 49-1293 49-1261-02

49-1166-01 49-1290

49-1288-01

49-1290 49-1288-01

FOR

PART

or

ON

PAGE

MODELS

SPEAKERS

IMPED.

(In

Ohms)

8 8

8 8 8

8 8

8

8 8

5

IN

THIS MANUAL

QTY.

AND

SIZE

(In

Inches)

2-8 2-3

2-10 2-3%

1-61/

2

1-2

1

-61/

2

1-2

1-61/

2

1-2

1-8 1-8

1-31/* 1-8 1-8

1-31/

2

1-8 1-8

1

-3%

1-10 1-31/

2

1-10 1

-31/

2

1-10 1

-31/

2

•

RECORD

CHANGER

PART

NUMBER

NOTE

169-570

169-581

169-570

169-581

169-586

169-571 8TK-R/P

169-586

B

PROVISION

NOTE

8TK-R/P 969-51

969-51

8TK-R/P 969-51

—

— —

—

OTHER FEATURES

—

PROVISION

C

SPEAKER

NOTE

D

A1,

A2,

SPK

A1,

A2,

SPK

A1,

A2,

SPK

A1,

A2,

SPK

A1,

A2,

SPK

A1,

A2,

SPK

A1,

A2,

SPK

A1,

A2,

SPK

20

Watt Handling Capability

20

Watt Handling Capability

20

Watt Handling Capability

40

Watt Handling Capability

40

Watt Handling Capability

40

Watt Handling Capability

60

Watt Handling Capability

60

Watt Handling Capability

60

Watt Handling Capability

TAPE

—

NOTE

A,

AFC AUX, HIF, TO

A,

AFC, AUX, HIF, TO

A,

AFC, AUX, HIF, TO

A,

AFC, AUX, HIF, TO

A,

AFC, AUX, HIF, TO

A,

AFC, AUX, HIF, TO

A,

AFC, AUX, HIF, TO

A,

AFC,

AUX, HIF, TO

A1

A2

A3

MISC.

E

DL, H,

RS,T,

DL, H,

RS,T,

DL, H,

RS,

T,

DL, H,

RS,T,

DL, H,

RS,T,

DL, H,

RS,T,

DL, H,

RS,T,

DL, H,

RS,T,

3

PRODUCT

FEATURES

CABINET

MODEL

MC4000 Walnut

MC4000-11 Walnut

MC4000-12

MC6020

MC6065 Walnut

MC7031 Walnut

MC7041

MC7051

MC9020 Walnut MC9025 MC9030 Walnut MC9035 MC9040 MC9050

MC9070

MC9070-1 Walnut

SL2597P9

COLOR

Walnut

Walnut Walnut Walnut

Walnut

Pecan

STYLE

NOTE

M, SP

M

M, D M, D M, D M, D M, D M, D

M

C, 2LL

•

REFER

MODEL TYPE

A

TO

CHASSIS

- -

— —

-

- -

-

3WR12X

SEE NOTES

PAGE

ONE

AM/FM/FM Stereo/Tape

AM/FM/FM Stereo

-

- -

-

1 ape

Tape

AM/FM/FM Stereo/Phono/ Tape/Color Combo

ON

INDEX

NUMBER

49-1291 49-1289 49-1288-01

PART

Note

FOR

D2

- -

PAGE

MODELS

SPEAKERS

IMPED.

(In

Ohms)

5.5

7.0

8.0

5.5

7.0

8.0

5.5

7.0

8.0

5

IN

QTY. AND (In

Inches)

1-12

1-5

1

1-12

1-5

1-31/

1-12

1-5

1

SIZE

-31/

-

- - -

-

- - - -

-

- -

- - -

49-1276 49-1234-04 49-1166

16

8

2-10

1-5

2-H

8

THIS MANUAL

RECORD

CHANGER

PART

NUMBER

NOTE

B

- -

2

— —

2

— —

2

Note

B3

Note

B3

Note

B3

Note

B3

Note

B3

169-574 169-579 169-575 169-580 169-576

-

169-585

•

OTHER FEATURES

TAPE

PROVISION

NOTE

8TK-R/P 969-54

CASS-R/P 969-59

TM

PROVISION

C

SPEAKER

NOTE

D

100

Watt

Handling

Capability

100

Watt

Handling

Capability

100

Watt Handling Capability

A1,

A2,

SPKOAB

A1,

A2,

A3,

A4,

SPKOAB

A2,

A3, A4 SPKOAB

A3,

A4, SPKOAB

A3,

A4, SPKOAB

- -

-

- - -

CASS-R/P 969-58

CASS-R/P 969-63

8TK-R/P 969-51

- -

-

- -

-

A2,

A3, A4, SPK

MISC.

NOTE

E

A4

AFC,

AUX,

DL,

F, H,

HIF,

LD,

LOF,

MS,

MU,T,TO

AFC,

AUX,

DL,

F, H,

HIF,

LD,

LOF,

MS,

MU,

T, TO

AFC,

AUX,

DE,

DL, F,

H, HIF, LD,

LOF,

MS, MU,TIO,TM, TS,

TZ

AFC,

AUX, DE,

DL, F, H,

HIF,

LD, LOF,

MS,MU,TIO,

TM,TS,TZ

AUX, DE,DL, F, H, HIF,

LD,

LOF, MS,

MU,

2TIO,

TD,

TM, TS,

TZ

-

H

A, AFC, AUX,

DL,

H, HIF,

T, TO

4

PRODUCT

NOTES

NOTE A - CABINET STYLE: C = Console, D = Dust Cover, M = Modular, LL - Lift Lid, 2LL - Two Lift Lids, SP = Speaker System.

NOTE B - RECORD CHANGERS NOTE B1: Provision for external record changer using a ceramic cartridge. NOTE B2: Provision for external record changer using a magnetic

cartridge. NOTE B3: Provision for external record changer using either a ceramic

or magnetic cartridge. Record Changers having alpha suffixes (i.e. 169-511 A) denote variations

of internal mechanical and/or electrical components (refer to Record Changer Features charts) but otherwise are interchangeable with other alpha suffix and non-suffix versions.

NOTE C - TAPE INPUT AND OUTPUT PROVISIONS:

Factory Installed: 8 TK - Eight Track Cartridge. Cass = Cassette, P = Play, R = Record. TM = Top of Set Model for installation with the designated console or modular models:

Model MC9070 - Cassette Tape Player/Recorder.

Tape Units having alpha suffixes (ie. 169-510A) denote variations of internal mechanical and/or electrical components (refer to Tape Unit

Features chart) but are otherwise interchangeable with other alpha suffix and non-suffix versions. Units having numeric (ie. 169-506O1) or numeric/alpha (ie. 169-506-01A) suffixes may have a one way interchangeability under some conditions (refer to Product Features chart).

NOTE D - SPEAKER PROVISIONS: NOTE D1: Models E9012 series, G1000W, G2000W, W11, G3000W,

W11,

G9012W1, H3000W series, J1000W series, J2000W series and J3000W series are 8 ohm Allegro Speaker Systems. Allegro Models in the E9014 and E9018 series were 16 ohm systems.

G9014W, G9019W, H1000W series, H2000W series,

FEATURES

NOTE D2: "K" and "L" Models may use either MC1000, MC2000, MC3000 or MC4000 8 ohm Allegro Speaker Systems as indicated. (See Speaker Provisions).

A1 = Model MC1000 Allegro 1000 Speaker System may be used. A2 = Model MC2000 Allegro 2000 Speaker System may be used. A3 = Model MC3000 Allegro 3000 Speaker System may be used. A4 = Model MC4000 Allegro 4000 Speaker System may be used. SPK = Switch to select Internal (Main), External (Remote) or Both Speaker Systems. SPKAB = Switch to select A, B or Both Speaker Systems. SPKOAB = Switch to select A, B or Both Speaker Systems or to switch all Speaker Systems off.

NOTE E - MISCELLANEOUS FEATURES:

= Speaker System is Allegro.

A A1 = Speaker System is Allegro 1000.

= Speaker System is Allegro 2000.

A2 A3 = Speaker System is Allegro 3000. A4 = Speaker System is Allegro 4000.

= AFC Defeat Switch.

AFC AUX = Auxiliary input accepts certain optional Record Changers or

DE = Deemphasis Switch. DL F = Flywheel Tuning. H = Headphone Jack (Stereo). HIF = Hi Filter Switch. LD LOF = Lo Filter Switch. MS = Mono/Stereo Switch. MU PL RS T = Tuning Meter. TD = Tape Dubbing Switch. TIO TM = Tape Monitor Switch. TO TS TZ = Zero Center Tuning Meter (FM).

Tape Units listed under Notes B and C.

= Dial Scale Light.

= Loudness Switch.

= FM Mute Switch. = Power Indicator Light (other than Dial Scale Light). = Record Storage.

= Tape Input/Output. = Tape Output.

= Signal Strength Meter (AM and FM).

5

PART

NUMBER

169-570

169-571 GAR

169-573 BSR

169-573-01

169-574

169-574-01

169-575

169-575-01

169-576

169-579 TENVA

169-580

169-581

169-585 TENVA

169-586

NOTE

1 — All

NOTE

2 — D =

NOTE

3 —

NOTE

4 —

NOTE

5 —

NOTE

6—

CODE

6200C

TENVA

record changers have 120VAC 60Hz motors.

Diamond,

Stylus

and 56-641-03

Adapter 27-628

Record changers will play

MFG.

GAR

630S

C197

BSR

C197

GAR 630S

GAR

GT4

GAR

GT4

GAR

GT25

MT30

MT60

BSR

C198

MT30

BSR

C218

56-641,

CART-

RIDGE,

STYLUS

NOTE

2

PRESSURE IN GRAMS

142-199

56-643

0.7D-3.0S

3.0-5.0

142-192

56-643

0.7D-3.0S

3.0-5.0

142-197

56-639

0.7D-3.0S

3.5-5.0

142-198

56-642

0.7D-3.0S

3.5-5.0

142-194

56-641

0.6D

3.5-5.0

142-189

56-641

0.6D

3.5-5.0

142-195

56-641-02

0.4X0.7D

2.5-4.5

142-189

56-641

0.6D

2.5-4.5

142-196

56-641-03

0.4X0.7D

1.5-3.0

142-200

56-641-04

0.6D

2.0-4.0

142-195

56-641-02

0.4X0.7D

2.0-4.0

142-190

56-643

0.7D-3.0S

3.0-5.0

142-201

56-647

0.7DX3.0S

3.0-5.0

142-202

56-647

0.7D-3.0S

3.0-5.5

S =

Manufactured Sapphire.

has a 0.6 mil

are

Bi-radial Eliptical stylus.

is a

disc type

45

RPM

ADAPTER

NOTE

A-7545

or

76-2132

A-7545

or

76-2132

S-72648,

A-6616

or

A-8352

S-72648,

A-6616,

or

27-628

A-7545

or

76-2132

A-7545

or

76-2132

27-627

or

76-2132

27-627

or

76-2132

27-627

or

76-2132

76-2132 Program

A-6616

or

27-628

spherical

and

as

many

as

many

RECORD CHANGER FEATURES

SEE NOTES BELOW

4

Off, Manual,

Auto,

Off, Manual,

Auto-Repeat

Off, Manual,

tip.

76-2132

as

five (flat

as six

MODES

(TYPE)

Auto

(Slide)

Auto

(Slide)

Auto

(Slide)

Off, On,

Auto

(Slide)

Auto

(Slide)

Auto

(Slide)

Repeat

(Slide)

Automatic,

Repeat

(Rotary)

1 Through

(Slide)

Play

(Button)

Program

1 Through

(Slide)

Play

(Button)

Off, On.

Auto

Program

1 Through

(Slide)

Play

(Button)

Off, On,

Auto

56-641-01

is a

stub type. Adapter used will vary with model.

and

(flat

and

SIZE

(TYPE)

12",

7", 33 7",

10",

(Slide) 12", 33 7", 33 7", 45 10", 78 (Slide)

7,10,12

(Slide)

7,10,12

(Slide)

12",

7",

7", 45 10",

(Slide)

12",

7",

7", 10",

(Slide)

N.A.

7,

12

7,

12

(Rotary)

N.A.

6

N.A.

6

7,10,12

(Slide)

N.A.

6

7,10,12

(Slide)

is an

optional

unwarped records

6

SPEED (TYPE)

33

45

78

33,45,78

(Slide)

33,45,78

(Slide)

33 33

78 33

33 45 78

33,

45

33,

45

(Slide)

33,

45

33,

45

(Slide)

33,

45

33,

45

(Rotary)

33,

45

(Slide)

33,

45

(Slide)

Pitch

Control

(Rotary)

33,45,78

(Slide)

33,

45

(Slide)

33,45

(Slide)

2.5 mil mfg

in

12-inch, 10-inch

RECORD

STACK

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

Note

5

sapphire stylus

TURN-

TABLE

DIA.

10

1/2"

Metal

10

1/2"

Metal

11"

Metal

11"

Metal

10

1/2"

Metal

10

1/2"

Metal

11

1/4"

Metal

(Belt

Drive)

11

1/4"

Metal

(Belt

Drive)

11

1/4"

Metal

(Belt

Drive)

11"

Aluminum

Metal

11"

Aluminum

Metal

10

1/2"

Plastic

11"

Aluminum

Metal

10

1/2"

Plastic

or

7-inch

TURN-

BASE

TABLE

PLATE COLOR

Black Black Chrome

Black Black

Black Black Chrome

N.A. Black N.A.

Gray

Black Black N.A.

Black Black Black

Black Black N.A.

Black Black Black

for

7-inch

PAD

COLOR

Black N.A.

playing

78 RPM

size. Sizes cannot

PRES-

SURE

ARM

COLOR

and

Black

Chrome

and

Black

Black Cue

and

Black

and

Black

records. 56-641-02

MISC.

(TYPE)

(Lever)

Viscous

(Lever)

Anti-Skate

(Slide)

(Lever)

Viscous

(Lever)

Anti-Skate

(Slide)

Viscous

(Lever)

Anti-Skate

(Slide)

Viscous

(Slide)

Anti-Skate

(Rotary)

Start/Reject

(Button)

Viscous

(Slide)

Anti-Skate

(Rotary)

Start/Reject

(Button)

Viscous

(Slide)

Anti-Skate

(Rotary)

Start/Reject

(Rotary)

Damped

(Lever)

Anti-Skate

(Rotary)

Belt Drive

24 Pole Motor

Damped

(Lever)

Anti-Skate

(Rotary)

Belt Drive

Electronic Drive

And Speed

Control

24_Pple Motor

Strobe Indicator

(Lever)

Anti-Skate

(Rotary)

2 Pole Motor Damped

(Lever)

Anti-Skate

(Rotary)

Belt Drive

24 Pole Motor

(Lever)

Anti-Skate

(Rotary)

Belt Drive

4 Pole Motor

be

intermixed.)

be

intermixed.)

Cue

TAPE

UNIT FEATURES

SEE NOTES BELOW

PART NO.

NOTE F

169-506 01A

169-545

169-546

969 51

969 52

969-54

969-55

969-56 TAN

969-57

969 58

969-59

969 60 TAN 969-61 VOR Cassette

969-62

969-63

A-7021 TAN

A-8051

MFG.

CODE

AMI/ML

TAN

TAN 8 Track

TAN

AM

I

VOR

AMI

TAN

8-TRACK/

CASSETTE

8-Track

Cassette

8-Track

Cassette

8-Track

Cassette

8-Track

Cassette

CHANNELS

PLAY

2

2 2 ALC

2

2 2

2

2 2 Full

2 2

2

2 2 2

2 2

2 2 Full

2

2 2 Full

RECORD

2

- -

2

ALC/FULL

FEATURE

2

2 ALC

2

MOTOR

NOTE B

NOTE A

Full

ALC

Full

Full DC/E

Full

NOTE B

AUTO

STOP

NOTE C

DC/M Full

DC/M

DC/E

DC/M

DC/E

DC/E Tape

DC/E

DC/M

DC/E

DC/M

DC/E

Four

R

Four

R/FFA

Four R,

Four R/FF

Tape

P/R

Four B

P/R/FF

Four

R/FF

Tape

P/R

Tape

P/R

All

Tape

P/R

-

Tape

P/R

Tape

P/R

Tape

All

Four

R/FF

Tape

P/R

USE

NOTE D

C

c

C, M

M

MA

M

C

M

MA

M

MISC.

FEATURES

MISC.

FEATURES

NOTE E

A2, C1 ,

FF, I, M,

P1,

R

A2,

C3, I, R

A2,

C3, FF, I, P2, R

A3,

C3, FF, I, P2,

R, RL

A3,

C4, CR, E, F, I,

P2,

RL, TC

A3,

C3, FF, I, M,

P2,

R, R L

A3,

C3, FF, I, M,

P2,

RL, RP

A3,

C4, CR, E, F, I, M, P2, R L, TB, TC, TE

A3,

C3, E, F, I, M,

P2,

RL, T, TB, TC,

TE A1,

C1, D, E, I, M, P2, PRL, RL,

TB3,

TC, TE3

A3,

C3, CR, D, E, F, I, M, P2, RL, T, TB/TE, TC

A2,

C3 A3,

C3, E, F, I, M, P2,

RL, T, TB, TC, TE

A3,

C3, CR, D, E, F, I, M, P2, RL, TB/TE,

TC

A1 , C1, D, E, I, M, P2,

PRL, RL, TB3,

TC,

TE3 A2,

C3, FF, I, M, P2,

RL, PP A2,

C4, CR, E, F, I, M, P2, RL, TB, TC,

TE

NOTES

NOTE A - RECORD

ALC = Automatic Level Control Full = Full Feature with Record Level Controls and Meters.

NOTE B - MOTOR

E = Electronic Governor M = Mechanical Governor

AC Motors require conversion kit if used on 50Hz.

NOTE C - AUTO STOP

Full = Stops after each program, fourth program or runs continously (in

both Play and Record modes). Selected by three position slide control.

Four R = Stops after fourth program in Record only. Four R/FF = Stops after fourth program in Record and Fast Forward only. Four

R/FFA

programs in Fast Forward.

Four B Forward only if Auto Stop Button is depressed. Tape P/R = Tape tension sensor at end of tape in Play and Record only. Tape All = Stops at end of tape in Play/Record/Fast Forward/Rewind modes.

NOTE D - USED IN

C = Console M = Modular MA = Modular Accessory W = Wedge Modular

= Stops after fourth program in Record and after all

P/R/FF

= Stops after fourth program in Play, Record and Fast

NOTE E - MISC. FEATURES

=

Parallel Blade Power Connector.

A1

=

Molex Type Power Connector.

A2

= Hard Wire Power Connector.

A3 B = Bias Frequency Switch. C1 = RCA Type Audio Connector.

=

Spade Lub Audio Connector.

C2

Hard Wire Audio Connector.

=

C3

=

Molex Type Audio Connector.

C4

=

Cue/Review.

CR

Dolby Noise Reduction System. Dolby is a trademark of Dolby

D

=

Laboratories, I nc.

E

=

Eject. F = Interlocked Fast Forward Button. F

F

Fast Forward Button (Push-Push Type).

=

I

Interlocked Record Button.

=

M

Record Level Meter (Illuminated).

=

Pause Button (Push In, Slide Left to Lock).

P1

=

Pause Button (Push-Push).

P2

=

Peak Record Light.

PRL

Automatic 2/4 Channel Switching, with mode indicator.

Q

=

Ready Light or Auto Stop Light.

R RL = Record Light. RP = Repeat Button. T = Tape Run Light.

= Tape Bias Switch (C

TB TB3 = Tape Bias Switch (CrO2/FeCr/Fe3O2) TC = Tape Counter. TE = Tape Equalization Switch (Cr02/Normal).

Tape Equalization Switch (High, Mid, Low).

=

TE3

/Normal).

rO2

•

NOTE F - PART NUMBERS

169-

Base numbers identify units with electronics while 969- and Abase numbers identify units without electronics (mechanism only). Features listed in Notes "A", "C" and "E" for 969- and A- base numbers include features which may vary with model application.

7

INTRODUCTION

This service manual contains detailed service information for common among the three, all sections of Models

Illustrations of the three models covered in this service manual of the three models,

appear below. As will be noted from the illustrations, styling is

MC7031,

MC7041 and

MC7051.

On the following pages are Feature Charts and Specifications

8

PRODUCT FEATURES

X OR LETTER DENOTES FEATURE INCLUDED AND NUMBER DENOTES QUANTITY: D = ROTARY DETENT ACTION (CENTER

FEATURES

POWER OUTPUT

(Min. T.H.D. NO MORE THAN BANDWIDTH OF 20 Hz - INTO AN 8 OHM LOAD TUNER/AMPLIFIER CONTROLS

VOLUME

BALANCE

TREBLE

BASS D

TUNING

TUNER/AMPLIFIER SWITCHES

POWER

LOUDNESS

HI FILTER P

LO FILTER P

SPEAKER

MONO/STEREO P

FM MUTE P

FM AFC

FM DE-EMPHASIS (on back)

TAPE MONITOR P TAPE DUBBING BANDSWITCH - POSITIONS

DETENT ON BALANCE CONTROL), F = ROTARY FLYWHEEL, K = KEYBOARD TYPE, P = PUSH BUTTON TYPE,

MODEL NUMBER

PRODUCT TYPE

R = ROTARY TYPE, S = SLIDE TYPE, T = TOGGLE TYPE

MC7031

AM/FM AM/FM

MC7041

MC7051

AM/FM PRODUCT TYPE

FEATURES

MODEL NUMBER MC7031

AM/FM AM/FM

TUNER/AMPLIFIER CONNECTORS

R.M.S.

per Channel) 15W 25W

OFF,

A, B or A+B R

AM R

FM

PHONO

AUXILIARY INPUT

MICROPHONE

0.1%

20 kHz

D

F F

T P

P S

- -

4

R R R R

- -

0.08%

20 Hz -

20 kHz 20 kHz PHONO IN - MAGNETIC

D D D D D D HEADPHONE (STEREO) D D EXTERNAL ANTENNA

T T T AC OUTLETS - UNSWITCHED T T T

R R T T T T S S T T

4 6

R R FM/AM (ILLUMINATED)

R R

R

40W

0.05%

20 Hz - PHONO IN - CERAMIC

F FM -300OHM BALANCED

T

T PHONO GROUND TERMINAL

T

-

T

2R

R R

TAPE INPUT TAPE OUTPUT

AUXILIARY INPUT SPEAKER OUTPUT -

PUSH TYPE (Pair) 2 2

FM - 75 OHM UNBALANCED

SWITCHED

MICROPHONE INPUT

TUNER/AMPLIFIER FEATURES

FM STEREO INDICATOR LIGHT FUNCTION INDICATOR LIGHTS

TUNING METER (ILLUMINATED)

CENTER READING FM

SIGNAL STRENGTH METER

SPEAKER PROTECTION FUSES X X SPEAKER PROTECTION CIRCUIT

X X 2 X X 2 X X X X X

X X

X X X X X

AM X X X

X

- -

X

- -

X X X

-

MC7041

X

X X

-

MC7051 AM/FM

-

2

X

2

X

-

X

9

GENERAL INFORMATION

THEORY

From time to time Zenith includes the use of new components and circuit applications in product design. Theory and explanation of such components and circuits is included in various manuals. Refer to inside front cover for further information.

CIRCUIT BOARD COMPONENT IDENTIFICATION

In order to assist the Service Technician, most circuit boards are marked to identify the location of components, test points, etc.,

using the schematic reference symbols and numbers. We have also prepared a drawing of the foil side of the circuit board showing the relationship between the components and the

foil.

This will aid the Technician in quickly tracing circuits, as not only are the components shown, but also the voltages at various check points. Components are identified by a letter/ number combination. A letter prefix to indicate the type of component: C=Capacitor, L=Coil, R=Resistor, CR=Diode, etc. The numbers are assigned, in blocks, to identify the circuit in which it is used:

Block Stage Example

1 - 99 FM Tuner R1, C1, L1.

101-

199 AM Tuner R101, C101, L101. 201 - 299 IF R201, C201, L201. 301-

399 Multiplex R301, C301, L301. 401 - 449 Main Preamp, Right Channel R401, C401, L401.

451 - 499 Main Preamp, Left Channel R451, C451, L451.

501-

599 Power Supply R501, C501, L501.

901-

949 Phono Preamp, Right Channel R901, C901, L901.

951-

999 Phono Preamp, Left Channel R951, C951, L951. 1401 - 1449 Power Amp, Right Channel R1401,C1401, 1451 - 1499 Power Amp, Left Channel R1451,C1451,

L1401. L1451.

c. Remove the old IC and be certain that the holes in the

circuit board are free of solder.

d.

Apply a heat conductive grease to the metal heat sink

surface against which the metal plate of the IC will be placed.

This grease can be obtained in quantities by

ordering Part No. 205-303.

e. Insert IC pins into correct holes in the circuit board.

f. Insert a screw through each of the IC's mounting holes.

Tighten the screws until they are snug. CAUTION — Do not overtighten these screws as too much force may cause internal damage to the IC.

g.

Solder all leads, being certain that solder does not bridge

to other pins, causing shorts which may damage the IC or external components.

4. Do not operate these amplifiers without their proper speaker load.

5. Do not short out the audio output of either channel when the amplifier is operating.

FM AGC VOLTAGE CURVE

Voltage developed at the AGC terminal of the IF IC (pin 15) varies depending on the IF voltage sampled in the chip. If a fixed input signal level were applied to several samples of a given chassis model, the measured AGC voltage for that

input level will vary among the samples. Voltage measured

under these conditions is not a complete indicator of proper AGC action.

Two important points must be noted:

1. When servicing these products, the Service Technician must plotted for a curve). consider the following:

1.

One integrated circuit is used for both channels of the power creases to approximately 1000 microvolts.

output stages. • • • • • • •

2.

Should a power output stage

a. Check for shorts between the integrated circuit outputs

(pins 5 and 11) and other pins. b. Check voltages at the IC pins. c. Check for defective components external to the IC,

including in the power supply.

3. Replace the power output IC in the following manner. a. A replacement power output IC normally has a kink in

each pin. This is the point at which the pins are to be bent when required to fit the circuit board.

b. Bend the pins at right angles at the kink in each pin.

CAUTION — Do not flex leads as this may cause internal damage to the IC.

fail;

MINIMUM RATED POWER OUTPUT PER CHANNEL INTO 8 OHMS

MODELS

MC7031 MC7041 2 25 MC7051 2

(SINE WAVE CONTINUOUS AVERAGE POWER -

OFTEN CALLED RMS POWER)

NUMBER OF

CHANNELS

WATTS PER

CHANNEL

2 15

40

General shape of the voltage curve (when the voltages are

2.

AGC voltage will start to drop as the RF input level in-

POWER

BANDWIDTH

20 Hz-20 KHz 20 Hz-20 KHz 0.08% 20 Hz-20 KHz 0.05%

TOTAL HARMONIC

DISTORTION (THD)

NO MORE THAN

0.1%

10

AM/FM/MULTIPLEX ALIGNMENT

GENERAL

These receivers have been aligned at the factory and normally will not require further adjustment. As a result, it is not recommended that any attempt be made to alter the stages. If any components are replaced or if anyone tampers with the adjustments, realignment may be necessary.

AM ALIGNMENT

It is recommended that AM IF's be aligned by the sweep method shown in the alignment procedure on the following pages.

If your signal generator does not have sweep capabilities

for the AM IF, use the alternate alignment procedure shown.

FM ALIGNMENT

Because of the wide band pass required in a FM Multiplex

tuner, it is desirable to use an FM signal generator having a

deviation of 250kHz as well as an oscilloscope, when aligning

both the FM IF and RF portions of this receiver. It is not only

necessary to obtain maximum amplitude in the IF amplifier

stages,

but also necessary to maintain symmetry. It is desirable

to use markers in obtaining IF curve symmetry.

Capacitors mentioned in the alignment procedure should be as small in size as possible and the ground lead of the generator must be connected to ground as close as possible to the point of injection.

MULTIPLEX ALIGNMENT

Before any attempt is made to align, or service, FM Multiplex circuitry, the technician must be certain that the RF, IF, and Detector alignment is correct, and that the receiver functions normally on monaural signals.

Most Multiplex generators are excellent troubleshooting devices because they provide a composite Multiplex signal as well as an RF signal (which is FM modulated by the composite

multiplex signal). The composite signal is very useful since it can be used in signal tracing the Multiplex portion of the

receiver. We do not recommend that Multiplex alignment be made using the composite signal injected at the output terminal of the Detector since there is alway some phase shift occurring in the RF, IF or Detector circuits. As a result, Multiplex alignment made by a signal injected at the Detector input would not be correct. For proper Multiplex alignment, the composite signal must FM modulate the RF carrier and then be fed into the FM antenna terminals. With the signal injected in this manner, the Multiplex alignment would then be the best that could possibly be obtained.

RF signals should be injected at a point in the FM band where no signal is present. If at all possible, this should be at a frequency near the middle of the FM band. Tune the FM receiver to this point and adjust the RF frequency adjustment on the generator to this same frequency. The AGC voltage developed in the receiver should be maximum. The AGC voltage substantially less than this may indicate the RF frequency is tuned to an image.

GENERAL TROUBLE-SHOOTING PROCEDURE

Should a problem arise in aligning the FM Multiplex portion of the receiver, the technician must determine whether the difficulty lies in the RF, IF, and Detector portions of the receiver, or whether the difficulty lies in the Multiplex portion. The composite output of the multiplex generator can be injected at the output of the Detector to help determine the area of difficulty. To reduce possible extraneous signals coming through a Detector, short the Detector primary with a jumper lead. The wave forms and their magnitude may vary slightly from chassis to chassis, however, they are quite indicative of what will be seen when signal tracing the Multiplex circuitry.

If all the waveforms are similar in form and magnitude to those indicated, it can be assumed that the Multiplex portion of the receiver is functioning properly and the problem lies ahead of this in the FM receiver. If any of the waveforms are missing at a latter point but are apparent at a previous point, circuitry between the two test points should be checked.

SCOPE PATTERN "A "

PROBE "A" - RF INPUT

SCOPE PATTERN "B"

PROBE "B"- DE-EMPHASIS

11

PROBE "C"- DETECTOR PROBE

RF,

IF, MPX AND AUDIO ALIGNMENT PROCEDURE

FOR MODELS

MC7031,

MC7041

STEP

CONNECT

GENERATOR

TO

DUMMY

ANTENNA

CONNECT

VTVM/

SCOPE TO

INPUT

SIGNAL

FREQ.

SET DIAL

TO

ADJUST

PURPOSE

AUDIO OUTPUT IDLE CURRENT ADJUSTMENT

CAUTION:

Be Certain That The Output Stages Have Been Adjusted For Proper Idle Current Under No Signal Input Conditions Before Perform-

ing Other Adjustments Or Alignment.

1

2

VTVM

Across R 1422

Across R1472

No Signal

I nput

R1412

R1462

Adjust Controls For 4mV Across Corresponding Resistors. This Would Be Approximately 15mA.

AM ALIGNMENT - PREFERRED METHOD - WITH AM SWEEP GENERATOR

NOTE:

For AM IF Alignment Use AM Sweep Signal Generator Of 10 KHz Deviation, 60 Hz Modulation For Full Bandpass Display. Bandswitch

In AM. Also Connect Modulation Frequency To Scope Horizontal. (If AM Sweep Not Available, See Steps 17 Through 31.)

Short Test Point "L" (AM Gang Antenna Section) To Chassis Ground.

3

Generator

Test Point "K"

4

5

6

7 8

9

1

0

1

1 12 13

14 15

16

AM ALIGNMENT - ALTERNATE METHOD - IF AM SWEEP GENERATOR IS NOT AVAILABLE

NOTE:

17

18

19

20

21

22

23 24

25 26 27 28 29 30 31

FM ALIGNMENT

NOTE:

32

33

34

35

Test Point "K"

AM IF Input

Remove Short Between Test Point "|_" And Chassis Ground.

One Turn Loosely

Coupled To AM

Wavemagnet

Antenna

For AM IF Alignment Use A Signal With 400 Hertz Modulation. Bandswitch in AM.

Short Test Point "L" (AM Gang Antenna Section) To Chassis Ground.

Test Point "K"

AM IF Input

Remove Short Between Test Point "L" And Chassis Ground.

One Turn Loosely

Coupled To AM

Wavemagnet

Antenna

For FM IF Alignment Use A Signal Of 250 KHz Deviation, 50 Hertz Modulation For Full Bandpass Display. Bandswitch In FM. Mute OFF. AFC

OFF.

Preset R208, R211, R303 And R313 To Mid Rotation Before Connecting Generator. Connect Generator Cable Ground To Gang Frame.

Shunt C1D To Ground With A .001 MF Capacitor.

Test Point "D"

FM IF Input

At Q2 Base

Generator

Output

Probe "A"

None

Generator

Output

Probe "A"

None

Generator

Output

Probe "A"

Scope

Detector

Output

Across R1 23,

Term.#104

Scope

Detector

Output

Across R 1 23,

Term.

#104

Term.

#104

Term.

#104

Term.

#104

Term.

#104

VTVM

Detector

Output

Across R123,

Term.

#104

Term.

#104

Term.

#104

Term.

#104

Term.

#104

Term.

#104

Term.

#104

VTVM

Detector

Output

Across R123,

Term.

#104

Term.

#104

Term.

#104

Term.

#104

Term.

#104

Scope

Detector

Probe "C"

Probe "C" Test Point

Test Point

"G"

At IC201

Pin 1

+ 455 KHz

Tune Generator To Center Total Bandpass Waveform. Do Not Change Generator Frequency

For Remainder Of AM IF Alignment.

Center

Freq.

Center

Freq.

Center

Freq.

Of Ceramic

Filter In T102

Repeat Steps 6, 7 & 8 For Minimum Change.

1400 KHz

600 KHz 600 KHz T101

Repeat Steps 11 & 12 For Minimum Change.

1400 KHz

600 KHz 600 KHz

Repeat Steps 14 & 15 ForMinimum Change.

+ 455 KHz Gang

Rock Generator While Adjusting L104 (T102 Primary) For Maximum.

Rock Generator While Adjusting L105

(T102 Secondary) For Maximum.

Repeat Steps 19 & 20 For Minimum Change.

Equal Output Should Be Found If Generator

Is Detuned Equal Frequency Each Side

Maximum.

Center

Freq.

Center

Ceramic Filter

1400 KHz 1400 KHz

Repeat Steps 26 & 27 For Minimum Change.

1400 KHz 1400 KHz

Repeat Steps 29 & 30 For Minimum Change.

± 10.7 MHz

Tune Generator To Center Total Bandpass

Waveform. Do Not Change Generator Frequency

For Remainder Of FM IF Alignment.

Center

Of Ceramic Filters Y201, Y202,

Of

Freq.

Of

In T102

600 KHz

600 KHz 600 KHz

Freq.

Y203.

Gang

Closed

Gang

Closed

1400 KHz C1 K

1400 KHz

Closed

Gang

Closed

600 KHz T101

Gang

Closed

Gang

Closed

-

L104,

L105

(T102)

T103 T104

C1

G

L111 If Necessary

1 1 03

T104

C1

K

C1G

L111 If Necessary

-

T201

Adjust Generator To Center

Adjust Generator To Center Frequency Of Ceramic

Frequency Of Ceramic

Adjust For Maximum Gain And Symmetry.

Adjust For Maximum.

Set Oscillator To Dial Scale.

Align Antenna Stage.

-

Adjust For Maximum.

Set Oscillator To Dial Scale.

Align Antenna Stage.

Align I.F. Transformer For Maxi-

Align I.F. Transformer For Maximum Output And Symmetry As

mum Output And Symmetry As

mum Output And Symmetry As Indicated In Scope Pattern "A".

Indicated In Scope Pattern "A".

Filter.

12

RF,

IF, MPX AND AUDIO ALIGNMENT PROCEDURE

FOR MODELS

MC7031,

MC7041 - Cont'd.

STEP

36

37

NOTE:

38

CONNECT

GENERATOR

TO

Test Point "A"

FM Antenna Post

(Disconnect Antenna)

For FM Detector Alignment Use A Signal Of 75 KHz Deviation, 1 KHz Modulation. Also Connect Generator Modulation Frequency To

Scope Horizontal. Adjust Generator IF Frequency To Center Total Bandpass Waveform. Do Not Change Generator IF Frequency For Remainder Of IF Alignment. (If Your Generator Does Not Provide Output For Audio Modulation Frequency Use Horizontal Output From Generator, Or Scope Horizontal Sweep, And Follow Step 38C.) Minimum Distortion Can Only Be Achieved By Use Of Step 38A Below.

Test Point "D"

FM IF Input

At Q2 Base

DUMMY

ANTENNA

300 Ohm

Generator

Output

Probe "A"

CONNECT

VTVM/

SCOPE TO

A. Distortion

Analyzer

(Thru a 100

Usee Deemphasis Network

Probe "B"

And Scope.

B. Scope

C. Scope

INPUT

SIGNAL

FREQ.

+ 98 MHz

Center

Frequency

Of Ceramic

Filters Y201,

Y202,

Y203.

Y202,

Y203.

SET DIAL

TO

98 MHz

Gang

Closed

ADJUST

R211

(Mute)

R208

(Meter)

L205,

L206

(T202)

PURPOSE

Adjust For No Sound Output When Input Is Below With Mute Switch ON.

Adjust For A Reading Of 6 On Meter M102 With 60 dbV (1mV) Input.

A. Preferred Method: Distortion Analyzer At Test Point "H"

Should Read Minimum Distortion.

B. Alternate Method: Adjust For Linear Scope Trace - No Curve At Ends Of Trace. Disregard Meter Reading.

C. Alternate Method: Adjust For Maximum Length And Symmetry,

Similar To Scope Pattern "B".

1.7/xV

39

40 Test Point "A" 41

42 43 44

45 46 47

NOTE:

48

49

50

NOTE:

Test Point "A"

FM Antenna Post

(Disconnect Antenna)

Apply Sufficient Signal Level — Approx. 100 Microvolts — To Obtain Full Limiting At Point Near 98 MHz.

Do Not Readjust Control R303 After Step 48.

300 Ohm

Test Point

"H"

Frequency

Counter And/

or Scope

Test Point

"M"

Scope And/Or

AC VTVM

Left Tape

Output

Right Tape

Output.

106 MHz

90 MHz

Repeat Steps 40 & 41 For Minimum Change.

106 MHz 106 MHz C1C

90 MHz 90 MHz L2 If Necessary

106 MHz

90 MHz

Repeat Steps 43 Thru 46 For Minimum Change.

Unmodulated

R F Carrier

98 MHz

10%

Pilot

10%

Pilot

(L + R) (L - R)

(L Only)

106 MHz C1E Set Oscillator To Dial Scale.

90 MHz L4

106 MHz

90 MHz

L205

(T202)

C1

R303

(VCO)

R313

L1

A

Adjust For Center Reading On

Tuning Meter M101.

Set Oscillator To Dial Scale.

Align FM Detector Stage For

Maximum.

Align FM Antenna Stage For

Align FM Antenna Stage For Maximum.

Maximum.

A. Frequency Counter Should Read

19 KHz, +100 Hz.

B. Alternate Method: Connect Test Point "M" Signal To Scope Vertical And An Accurate 19 KHz Signal To Scope Horizontal Input. Adjust For One Square Synchronized Waveform.

Adjust For Separation. Maximum

Left Output.

Check For Separation. Minimum Right Output.

COLOR

CODE

Black

Blue

Red

Orange

White

CERAMIC FILTERS

NOMINAL CENTER

FREQUENCY

RANGE

10.64 MHz 10.61 to 10.67 MHz

10.67 MHz

10.70 MHz

10.73 MHz

10.76 MHz

10.64 to 10.70 MHz

10.67 to 10.73 MHz

10.70 to 10.76 MHz

10.73 to 10.79 MHz

13

RF,

IF AND MPX ALIGNMENT PROCEDURE

FOR MODEL MC7051

STEP

VOLTAGE REGULATOR ADJUSTMENT

CAUTION:

1

AUDIO OUTPUT IDLE CURRENT ADJUSTMENT

CAUTION : Output Stages Must Be Adjusted For Proper Idle Current Under No Signal

2

3

AM ALIGNMENT - PREFERRED METHOD - WITH AM SWEEP GENERATOR

NOTE:

4 Short C1J (AM Gang Antenna Section) To Chassis Ground. 5 Test Point "K"

6

7

8

9

10 One Turn Loosely

1

1 12 13

14 15

16

AM ALIGNMENT - ALTERNATE METHOD - IF AM SWEEP GENERATOR IS NOT AVAILABLE

NOTE:

17 Short C1J (AM Gang Antenna Section) To Chassis Ground.

18

19

20

21

22

23

24 Remove Short Between C1J And Chassis Ground. 25

26 27

28

29 30

31

CONNECT

GENERATOR

TO

Regulator Must Be Adjusted For Correct B+ Voltage.

- -

Conditions Before Performing Other Adjustments Or Alignment.

For AM IF Alignment Use AM Sweep Signal Generator Of 10 KHz Deviation, 60 Hz Modulation For Full Bandpass Display. Bandswitch

In AM. Also Connect Modulation Frequency To Scope Horizontal. (If AM Sweep Not Available, See Steps 17 Through 31.)

Test Point "K"

AM I F Input

Remove Short Between C1J And Chassis Ground.

One Turn Loosely

Coupled To AM

Wavemagnet

Antenna

For AM IF Alignment Use A Signal With 400 Hertz Modulation. Bandswitch In AM.

Test Point "K"

AM IF Input

One Turn Loosely

Coupled To AM

Wavemagnet

Antenna

DUMMY

ANTENNA

Generator

Output

Probe "A"

None Scope

None

Generator

Output

Probe "A"

None

CONNECT

VTVM/

SCOPE TO

VTVM

Pin 505

VTVM

Across R1418

Across

R1468

Scope

Detector

Output

Across R1 10

Detector

Output

Across R

Across R110

VTVM

Detector

Output

VTVM

Detector

Output

1 1

0

INPUT

SIGNAL

FREQ.

-

No Signal

Input

+ 455 KHz

Tune Generator To Center Total Bandpass Waveform. Do Not Change Generator Frequency For Remainder Of AM IF Alignment.

Center

Freq.

Center

Freq.

Of Ceramic

Filter In T102

1400KHz

600KHz

Repeat Steps 1 0 & 11 For Minimum Change.

0

1400KHz 1400KHz C1J

600KHz

Repeat Steps 13 & 14 For Minimum Change.

1000 KHz

+ 455 KHz

Rock Generator While Adjusting L103

(T102 Primary) For Maximum.

Rock Generator While Adjusting L104 (T102 Secondary) For Maximum.

Repeat Steps 19 & 20 For Minimum Change. Equal Output Should Be Found If Generator

Is Detuned Equal Frequency Each Side Maximum.

Center

Freq.

Of Ceramic

Filter In T102

1400 KHz 600 KHz

Repeat Steps 26 & 27 For Minimum Change.

1400 KHz

600 KHz

Repeat Steps 29 & 30 For Minimum Change.

1000 KHz

SET DIAL

TO

-

Gang

Closed

Gang

Closed

1400KHz

600KHz

1000 KHz

Gang

Closed

Gang

Closed

1400 KHz

600 KHz L102

1400 KHz

600 KHz

1000 KHz

ADJUST

R509

R1409

R1459

L103,

(T102)

T101

C1 K

L102

L101 If

Necessary

R106

T101

C1K

C1J

L101 If

Necessary

R106

-

L104

PURPOSE

Adjust For +33V.

Adjust Controls for 8 m V Across

Adjust Controls for 8 m V Across Corresponding Resistors. This

Corresponding Resistors. This Would Equal Approximately

Would Equal Approximately 16 mA.

16 mA.

Adjust Generator To Center

Adjust Generator To Center Frequency Of Ceramic

Frequency Of Ceramic

Adjust For Maximum Gain And Symmetry.

Adjust For Maximum.

Set Oscillator To Dial Scale.

Align Antenna Stage.

Adjust For A Reading Of 4 To 5 On Meter M102 With Input Of 74dBV(5mV).

—

Adjust For Maximum.

Set Oscillator To Dial Scale.

Align Antenna Stage.

Adjust For A Reading Of 4 To 5 On Meter M102 With Input Of 74dBV(5mV).

14

Filter.

RF,

IF AND MPX ALIGNMENT PROCEDURE

FOR MODEL MC7051 - Cont'd.

STEP

FM ALIGNMENT

Note: R21 1 And R303 To Mid Rotation Before Connecting Generator. Connect Generator Cable Ground To Gang Frame.

32

33

34

35

36

37

NOTE:

38

39

40 Test Point "A" 41 42

43 44 45

46 47 48 Audio Osc.

49

NOTE : Apply Sufficient Signal Level — Approx. 1 00 Microvolts — To Obtain Full Limiting At Point Near 98 MHz.

50

51

52

NOTE:

CONNECT

GENERATOR

TO

For FM IF Alignment Use A Signal Of 250 KHz Deviation, 50 Hertz Modulation For Full Bandpass Display. Bandswitch In FM. Preset R208,

Shunt C1B To Ground With A .001 MF Capacitor.

Test Point "D"

FM IF Input

At High Side

Of C1F

Test Point "A"

FM Antenna Post

(Disconnect Antenna)

For FM Detector Alignment Use A Signal Of 75 KHz Deviation, 1 KHz Modulation. Also Connect Generator Modulation Frequency To

Scope Horizontal. Adjust Generator IF Frequency To Center Total Bandpass Waveform. Do Not Change Generator IF Frequency For

Remainder Of IF Alignment. (If Your Generator Does Not Provide Output For Audio Modulation Frequency Use Horizontal Output From

Generator, Or Scope Horizontal Sweep, And Follow Step 38C). Minimum Distortion Can Only Be Achieved By Use Of Step 38A Below.

Test Point "D"

FM IF Input

At High Side

Of C1F

FM Antenna Post

(Disconnect Antenna)

Test Point "H"

Do Not Readjust Control R308 After Step 50.

DUMMY

ANTENNA

Generator

Output

Probe "A"

300 Ohm Scope

Generator

Output

Probe "A"

300 Ohm

—

CONNECT

VTVM/

SCOPE TO

Scope

Detector

Probe "C"

Test Point

At IC201

Pin 1.

Test Point

"H"

A. Distortion

Analyzer

(Thru A 100

Usee De-

emphasis

Network)

Probe "B"

And Scope.

B.Scope

C.Scope

Test Point

"H"

Test Point

"F"

Frequency

Counter And/

Or Scope

Test Point

"M"

Scope And/Or

AC VTVM

Left Tape

Output

Right Tape

Output.

INPUT

SIGNAL

FREQ.

10.7 MHz Gang

Tune Generator To Center Total Bandpass Waveform. Do Not Change Generator Frequency

For Remainder Of FM IF Alignment.

Center

Freq.

Of Ceramic

Filters Y201,

Y202,

Y203

98 MHz

Center

Frequency

Of Ceramic

Filters Y201,

Y202,

Y203.

Y202,

Y203.

106 MHz

90 MHz 90 MHz

Repeat Steps 40 & 41 For Minimum Change.

106 MHz

90 MHz 90 MHz

106 MHz 106 MHz

90 MHz

Repeat Steps 43 Thru 46 For Minimum Change.

200 KHz

Unmodulated

RF Carrier

98 MHz

1 0% Pilot

(L+R) (L-R)

(L Only)

SET DIAL

TO

Closed

Gang

Closed

98 MHz R216

98 MHz

Gang

Closed

1

06 MHz

1

06 MHz

90 MHz

ADJUST

R215

L204,

(T201)

C1D,

L3,

L2 If Necessary

T301 T302

R308

R318

T1

L205

C1H

L7

C1F L4

C1B

—

PURPOSE

Align I.F. Transformer For

Align I.F. Transformer For Maximum Output And Symmetry

Maximum Output And Symmetry

Maximum Output And Symmetry As Indicated In Scope Pattern "A".

As Indicated In Scope Pattern "A".

Adjust For No Sound Output

When Input Is Below

Mute Switch ON. Adjust For A Reading Of 4 To 5

One Meter M1 02 With Input Of 60dBV (1mV).

A. Preferred Method: Distortion Analyzer At Test Point "H"

Should Read Minimum Distortion.

B. Alternate Method: Adjust For

Linear Scope Trace-No Curve At Ends

Of Trace. Disregard Meter Reading. C. Alternate Method: Adjust For

Maximum Length And Symmetry,

Similar To Scope Pattern "A".

Adjust For Center Reading On

Tuning Meter M101.

Set Oscillator To Dial Scale.

Align FM Detector Stage For

Align FM Detector Stage For Maximum.

Maximum.

Align FM Antenna Stage For

Align FM Antenna Stage For Maximum.

Maximum.

Align For Minimum.

A. Frequency Counter Should Read 19 KHz, + 100 Hz.

B. Alternate Method: Connect Test Point "M" Signal To Scope Vertical And An Accurate 19 KHz Signal To Scope Horizontal Input. Adjust For One Square Synchronized

Waveform.

Adjust For Separation. Maximum Left Output.

Check For Separation. Minimum Right Output.

1.7/iV

With

CERAMIC FILTERS

COLOR

CODE

Black

NOMINAL CENTER

FREQUENCY

10.64 MHz 10.61 to 10.67 MHz

Blue 10.67 MHz

Red

10.70 MHz

Orange 10.73 MHz

White

10.76 MHz

FREQUENCY

RANGE

10.64 to 10.70 MHz

10.67 to 10.73 MHz

10.70 to 10.76 MHz

10.73 to 10.79 MHz

15

DISASSEMBLY PROCEDURES

FIGURE 1 - MODEL MC7041 - FRONT VIEW

CHASSIS ACCESS

Access to most areas of the chassis can be achieved by removal of the cabinet top and the bottom cover (See Figures 1 and 2). Numbers in parenthesis ( ) correspond to the numbers shown on exploded views and other illustrations.

2.

When removing bottom cover (2) note that the front edge

of bottom cover must be inserted under lip of front frame when it is reinstalled.

FRONT PANEL (ESCUTCHEON REMOVAL)

Certain components along the front edge of the chassis can be reached only after the front panel (3) has been removed:

CABINET TOP REMOVAL

1.

Remove two screws (83 on MC7031 and 82 on MC7041)

and their cup washers (58) located on each side of the cabinet (1).

2.

Lift cabinet (1) upward from chassis.

CHASSIS BOTTOM COVER REMOVAL

1.

Remove nine screws (82 on MC7031 and 81 on MC7041)

from bottom cover (2).

NOTE:

It is not necessary to remove the four screws

(81 on MC7031 and 80 on MC7041) holding the

four feet (59 on MC7031 and 87 on MC7041).

1.

Loosen the alien screw (recessed in tuning knob assembly)

holding tuning knob assembly (6) to tuning shaft (18 on MC7031 and 20 on MC7041).

2.

Remove tuning knob assembly from shaft.

3. Remove remaining knobs by pulling outward.

4. Remove five screws from the front panel (3).

a. Three screws (74 on MC7031 and 77 on MC7041)

are located on the bottom.

b. Two screws (72 on MC7031 and 86 on MC7041)

are located on the top.

5. Remove front panel (3) by pulling outwards.

FIGURE 2 - MODEL MC7041 - BACK VIEW

16

FIGURE 3 - MODEL MC7041 - CHASSIS VIEW

DIAL LIGHT REPLACEMENT

Four wedge base type lamps (DS501 through DS504) are

used in these models. They may be replaced in the following

manner.

1.

Remove cabinet top (1) as explained above.

2.

Lamps are mounted in grommets (60 on MC7031 and 21

on MC7041).

3. Remove grommet and lamp.

4. Lamp is soldered to leads within grommet.

5. Carefully pull lamp out of grommet.

6. Unsolder lamp leads and remove lamp.

7. Solder new lamp to leads.

8. Press lamp into grommet, being certain that it is fully seated.

9.

Press grommet firmly into light reflector (23 on MC7031

and 22 on MC7041), using a twisting motion until it is secure.

10.

Be certain that leads are dressed away from the dial cord.

FIGURE 4 - MODEL MC7051 - FRONT VIEW

17

REMOVE FIVE SCREWS (76)

REMOVE NINE SCREWS (76)

REMOVE ONE SCREW (76)

AND WASHER (29)

REMOVE TWO SCREWS (79) AND CUP WASHERS (49) ON EACH SIDE

FIGURE 5 - MODEL MC7051 - BACK VIEW

MODEL MC7051

CHASSIS ACCESS

Access to most areas of the chassis can be achieved by removal of the cabinet top and the bottom cover (See Figures 4 and 5).

CABINET TOP REMOVAL

1.

Remove two screws (79) and their cup washers (49)

located on each side of the cabinet (1).

2.

Lift cabinet (1) upward from chassis.

CHASSIS BOTTOM COVER REMOVAL

1.

Remove fourteen screws (76) from bottom cover (2).

2.

Remove one screw (76) and metal washer (29) located

near center of bottom cover (1).

NOTE:

It is not necessary to remove the four screws (77)

holding the four feet (48).

FRONT PANEL (ESCUTCHEON) REMOVAL

Certain components along the front edge of the chassis can be reached only after the front panel (3) has been removed:

1.

Remove cabinet (1) as above.

6. Remove front panel (3) by pulling outwards.

CONTROL CIRCUIT BOARD REMOVAL

Most customer operating controls are mounted on one circuit board assembly (98) located directly behind the front panel (3). Proceed as follows:

1.

Remove the cabinet top (1), bottom cover (2) and front

panel (3) as explained above.

2.

Remove masking strips (27, 28) from the eight toggle type

control levers.

3. Release interconnecting wires and cables from three wire retaining clips (40, 41) on top of chassis and from one clip (34) on bottom of chassis (adjacent to circuit board).

4. Remove four screws from front chassis frame (5).

5. Slide control chassis assembly to rear and downward until it clears front chassis frame (5).

6. Reinstall control chassis assembly, reversing the above procedure.

NOTE:

When reinstalling the control chassis assembly, slide

the end nearest the tuning control inward first.

2.

Loosen the alien screw (recessed in tuning knob assembly)

holding tuning knob assembly (15) to tuning shaft (24).

3. Remove tuning knob assembly (15) from shaft (24).

4. Remove remaining knobs by pulling outward.

5. Remove five screws from the front panel (3).

a. Three screws (82) are located on the bottom.

b. Two screws (74) are located on the top.

DIAL LIGHT REPLACEMENT

Five wedge base type lamps (DSX501 through DSX505) are used in this model. They may be replaced as follows: (See Figure 6):

1.

Remove cabinet top (1) as explained above.

2.

Twist lamp socket (101) counterclockwise and remove

lamp socket (101) with lamp.

18

FIGURE 6 - MODEL MC7051 -

DIAL LIGHT REPLACEMENT

NOTE:

These lamps snap into clip type contacts in the

lamp socket.

4. Install new lamp in socket by aligning lamp contacts with clip contacts in lamp socket (101) and pressing lamp fully

into clip contacts.

5. Reinsert lamp socket (101) into lamp circuit board (97) and rotate lamp socket (101) clockwise to secure.

NOTE:

Do not use excessive pressure when inserting and

rotating the lamp sockets.

OUTPUT TRANSISTOR REPLACEMENT ACCESS

Replacement of output transistors can be made easier by

removing the output amplifier circuit board (95) and heat

sink (10) as follows (See Figure 7):

1.

Remove three screws (82) in mounting bracket (46) and

another three screws (82) in bracket (47).

2.

Remove one screw (88) mounting output amplifier circuit

board (95).

3. Raise assembly and tilt forward to provide the desired access.

4. Replace transistors in the normal manner.

FIGURE 7 - MODEL MC7051 - POWER OUTPUT AMPLIFIER

19

THEORY AND APPLICATION

MODELS

Basic circuitry for these models has been covered in Service Manual HF-38 (Part No. 923-943), however there are certain

points which are also being included, or expanded in this

manual.

MC7031, MC7041,

AND MC7051

MODEL MC7051

FM RF

(See Figure 8)

A dual gate FET is used for FM RF, while two conventional

NPN transistors are used for FM Oscillator and FM Mixer. Oscillator injection is accomplished by coupling from the tap on Oscillator Coil L7 to the base of FM Mixer Q2. FM signal is coupled from FM RF Q1 to FM Mixer Q2 via the inductive coupling between the RF Coil L3 and Mixer Coil L4. Looking at the chassis, the FM tuner assembly is enclosed within a

metal shield. Through an opening in the top of the shield, one can see L3 and L4. These coils are inductively coupled via the approximate 1/2" spacing between them.

OUTPUT STAGES

(See Figure 9)

Each output channel of this model contains four transistors

(Q1401, circuit, two predriver transistors (Q1405 and Q1407), one bias transistor (Q1406), two driver transistors (Q1408 and Q1409)

and two output transistors (Q1410 and Q1411). Driver sistors Q1408 and Q1409 operate in push-pull and drive Output transistors Q1410 and Q1411 respectively. L1401 is

Q1402, Q1403 and Q1404) in a differential amplifier

tran-

FIGURE 8 - MODEL MC7051 - FM TUNER

incorporated to compensate for capacitive loads at the output terminals. R1409 provides for idle current adjustment.

AUTOMATIC SPEAKER PROTECTION CIRCUIT

(See Figures 9, 10 and 11)

Special circuitry is incorporated in this model to provide automatic speaker protection in the event of either excessive voltage, excessive current or low impedance. In the event that a higher than normal voltage appears at the output (after

L1401),

it will appear across R747. If the voltage is in the

FIGURE 9 - MODEL MC7051 - OUTPUT STAGE SCHEMATIC

20

FIGURE 10 - MODEL MC7051 - OUTPUT STAGE IC BLOCK DIAGRAM

positive direction Q709 will conduct, turning on Q711 and Q712.

This in turn switches Q713 off, deactivating relay

K701.

When the closed contacts on relay K701 are switched

open,

the circuit to the speaker connectors is opened. When

the over-voltage is in the negative direction Q710 will turn

on,

and in turn, Q711 and Q712 will switch on. This will also deactivate Q713 and relay K701, thereby protecting the speakers.

FIGURE 11 - MODEL MC7051 - AUTOMATIC SPEAKER PROTECTION CIRCUIT

21

FIGURE 12-MODEL MC7051 - SPEAKER CONNECTIONS

2.

Shorted voice coil winding, or other circuit defect.

One eight ohm speaker connected to each "A" and "B" speaker

output results in the minimum recommended load impedance.

As long as the effective load impedance is greater than approximately three ohms, the resistance ratio of R735/R731 will closely match the ratio of R1419/Load. The same would also be true of ratios R736/R732 and R1418/Load. Under this

condition, voltages from outputs will not overcome the oppos-

ing voltages developed by diodes CR701 and CR702. This maintains transistor Q707 at "cut-off".

If the load impedance drops below approximately three ohms,

the ratios change, causing the emitter voltage of Q707 to go

negative and the base voltage to go positive. This will forward bias Q707, turning it "on". When Q707 conducts, it will

activate the remainder of the circuitry, causing speaker relay

K701 to open, disconnecting the low impedance load, thereby protecting the receivers output circuitry.

Current overload protection occurs when excess current is sensed through R1418 and R1419. These currents will flow via

R731 and R732. Small overloads will develop a voltage between

base and emitter of Q707, causing Q707 to conduct, CR705

will be biased on, applying bias to Q711. Q711 will turn Q712

on and Q713 off, deactivating K701. When higher overload currents exist, they will cause a larger voltage across Q707's base emitter junction. This will cause diodes CR701 and CR702 to turn on, providing protection for Q707.

An added circuit function is the protection of output circuitry used in these models if the external load impedance is below the design limit. A low load impedance could exist if:

1.

Wrong impedance speakers were connected. CAUTION —

One four ohm and one eight ohm speaker would result in an effective load impedance that is below the design limit.

SPEAKER CONNECTORS

Models in this manual are provided with push type wire connectors of the type illustrated in Figure 12. The eight individual connectors are wired internally to provide two pairs of connectors for the right channel and two pairs for the left channel. Corresponding left and right channel pairs are selected by a front panel speaker selector switching system. One connector in each pair is marked in red, while the other is black. The red connector is the "hot" lead for the pair. Speaker cable normally has one of the two conductors marked with a color stripe or has a rib molded as part of the insulation.

This marked lead is the positive lead and should be connected to the red connector, while the unmarked conductor goes to the black connector of a pair. To make connections to either of these terminals, depress the moving part of the connector, insert bared end of lead into hole in proper connector (note marking on leads), then release pressure on connector. Repeat same procedure for other lead.

22

NOTES

23

AUDIO MODEL MC7031W

REF NO

C517 C518 822-02632 6800uF 35V ELECTROLYTIC C911 822-02698 39pF ±5% 50V CERAMIC CAP C912 822-02497 0.022uF +80-20% 50V CERAMIC CAP C961 822-02698 39pF ±5% 50V CERAMIC CAP DS501 900-00322 PILOT LAMP. 300MA, DIAL SCALE DS502 900-00322 PILOT LAMP. 300MA .DIAL SCALE

DS503 900-00322 PILOT LAMP. 300MA. DIAL SCALE DS504 900-00322 F1401 936-00065 3 AMP R. CHAN. SPKR PR'TECT'N FUSE F1451 936-00065 3 AMP L. CHAN. SPKR PROTECT'N FUSE F501 936-00071 F502

F503 F504 J001 844-00224 HEADPHONE JACK L111 820-01147 AM ANTENNA COIL M101 922-00067 M102 922-00062 P501 811-00218 AC LINE CORD Q503 921-01167

Q504 921-01062 PHONO EQUALIZER VOLTAGE R1428 863-02692

R1478 863-02692 R508 R512 R913 863-02496 3.3MΩ R914 863-02721 R963 863-02496 3.3MΩ

R964 S001 885-00627

S009 885-00615 ROTARY SPEAKER SELECT SWITCH S501 885-00577 AC POWER LEVER SWITCH T501 895-01099 POWER TRANSFORMER 0001 814-01022 0002 0003 0004 804-00704 BACK PANEL 0005 0006 0007 846-01094

0008 846-01097 TONE CONTROL KNOB (2 REQ.) 0009 846-01065 0010

0011 846-01064

0012 0013 992-00213

0014 0015 0016 0017 0018 0019 0020 812-01212 0021 0022

0023 998-00054 0024 863-01042 LEVER SWITCH MASKING STRIP 0025 0026 0027 859-00306 0028 0029 0030 833-00215 CHASSIS MTG FRAME (2 REQ.) 0031 0032 0033 926-00354 0034 894-00314

0035 0036 846-01097 0037 0038

0039 0040

0041 817-00307 0042

0043

|

0044 841-00226 AM ANTENNA HOLDER

PART NO DESCRIPTION

CABINET COMPONENTS

822-02632

936-00068 2 AMP PIGTAIL FUSE 936-00080 5 AMP PIGTAIL FUSE 936-00080 5 AMP PIGTAIL FUSE

863-02470 1800Ω 863-02458 2.2MΩ

863-02721

804-00605 857-01710 FRONT PANEL

804-00603 846-01044

894-00313

843-00269

824-00549 826-00207 812-01211 812-01210 DIAL SCALE LEFT MTG BRACKET 876-00565 883-01052

812-01213 812-01310

812-01311 812-01340

859-00307 DIAL POINTER GUIDE 812-01216

833-00214 926-00391

812-01207 883-01022

886-00335

880-01223 POWER TRANSISTOR CLIP SPRING 811-00217

824-00575 862-00005

6800uF 35V ELECTROLYTIC

PILOT LAMP. 300MA. DIAL SCALE

0.5 AMP SLO-BLO PIGTAIL FUSE

FM TUNING METER AM SIGNAL METER

PHONO EQUALIZER VOLTAGE

REGULATOR TRANSISTOR NPN REGULATOR TRANSISTOR NPN

330Ω

±10%

330Ω

1.2MΩ

ROTARY FUNCTION SWITCH (AM, FM,

PHONO, AUX PART OF REF.NO.92

804724 SWITCH & PCB)

WOOD CABINET CHASSIS BOTTOM

CHASSIS FRONT TUNING KNOB

FUNCTION SWITCH KNOB (AM, FM

PHONO & AUX)

POWER SWITCH KNOB

PUSH SWITCH INSULATING BUSHING (1

USED ON EA Ret No 11 846-1064 KNOB)

PUSH KNOB (MODE MONO STEREO. LO

FILTER ON OFF, HI FILTER ON OFF, MONITOR TAPE SOURCE, FM AFC ON OFF, ON OFF 7 REQ.)

PUSH KNOB GUIDE (1 USED ON EACH

REF.

DIAL LENS TUNING SHAFT COVER TUNING DIAL SCALE

DIAL SCALE RIGHT MTG BRACKET TUNING SHAFT

TUNING METER RETAINING STRIP TUNING METER MTG BRACKET

LED LAMP MTG BRACKET

BRACKET MTS. REF. NO. 91 804-729

LED PRINTED CIRCUIT BOARD

DIAL LAMP REFLECTOR

POWER SWITCH MTG BRACKET

HEADPHONE JACK MTG BRACKET

DIAL POINTER TONE CONTROL MTG BRACKET

FRAME (MTS. POWER AMPLIFIER PCB)

POWER AMPLIFIER HEAT SINK

POWER TRANSISTOR INSULATING

BUSHING(4 REQ.) POWER TRANSFORMER MTG BRACKET FILTER CAP. MTG BRACKET (2 REQ *

5 LUG TERMINAL STRIP(2 REQ)

2 LUG CONNECTOR (FOR REF. NO.C517

& C518 822-2632 ELECTROLYTIC!

WIRE TIE STRAP (USED ON Ref No P501

811-218. AC CORD)

STRAIN RELIEF CLAMP (RETAINS REF.

NO.

SPEAKER PROTECTION FUSE COVER SPEAKER PROTECTION FUSE HOLDER

(MTS.

1W METAL FILM RES

±10%

1W METAL FILM RES

±5%

1 4W CARBON FILM RES

±5%

1/2W LINE ISOLATION RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

FM MUTE ON OFF, LOUDNESS

ON. 11 846-1064 KNOB 7 REQ.)

P501.811-218.AC CORD )

REF. NO.F1401.F1451.936-65.)

REF NO

0046 0047 817-00311 DE-EMPHASIS SWITCH BRKT CLAMP 0048 883-01036 0049 844-00223

0050 0051 0052 926-00392 TUNING CAPACITOR SHIELD 0053 926-00356 TUNING CAPACITOR SHIELD 0054 926-00385 TUNING ASSEMBLY SHIELD 0055 0056 861-00481 TUNING CAPACITOR PULLEY 0057 874-00053 VENTILATION SCREEN 0058 0059 966-00109 CABINET FOOT(4 REQ.) 0060 0061

0062 854-00319 0063 897-00306 0064 886-00337 MAGNETIC PHONO GROUND STUD

0065 854-00345 0066 0067 912-02149 3X6MM ROUND HEAD SCREW (20 REQ.)

0068 912-02150 0069

0070

0071 912-02208 0072 912-02191 3X8MM SCREW(2 REQ.) 0073 912-02159

0074 912-02181 0075 912-02241 3X12MM SCREW(12 REQ.) 0076 912-02203 3X8MM SCREW (12 REQ.) 0077

0078 912-02192 2.6X1 OMM SCREW(2 USED) 0079 912-02185

0080 0081 912-02373 0082

0083 912-02375 4X12MM SCREW 0084 893-01183 5.9MM SPLIT LOCKWASHER(4 REQ.) 0085 0086 854-00348 0087 854-00346 2.6MM HEX NUT(2 REQ.) 0088 861-00447 12X2.4MM PULLEY(2 REQ.) 0089 0090

0096 804-00725

0097 844-00226 0098 885-00578

0099 878-00115 0101 857-01681 ZENITH NAME PLATE

TUNER PRINTED CIRCUIT BOARD COMPONENTS

CR001 903-00345 CR101 903-00418 AM IF DIODE CR102

CR103 CR104 903-00384 CR105 903-00384 AM OVERLOAD DIODE CR201 CR202 903-00419 FM AGC DIODE CR203 903-00419 CR301 C001 822-02852 VARIABLE TUNING CAPACITOR C002 C003 822-02570 100pF ±5% 50V CERAMIC CAP C004 C005 C006 C007 822-02368 C008 822-02930 15pF ±5% 50V CERAMIC CAP C009 822-02408 220uF 16V ELECTROLYTIC C010 822-02497 0.022uF +80-20% 50V CERAMIC CAP C011 822-02367 7pF ±0.5pF 50V CERAMIC CAP C012 C013 822-02561 C014 822-02628 18pF ±5% 50V CERAMIC CAP C015 822-02563 8pF ±0.5pF 50V CERAMIC CAP C016 822-02379 4700pF ±20% 50V CERAMIC CAP

PART NO

812-01209

844-00221 JACK CLUSTER (PHONO MAG L R) 886-00329 CHASSIS GROUND LUG

880-01287

893-01182 841-00234 DIAL LAMP HOLDER(4 REQ.)

912-02188

893-01093

912-02151 912-02154

912-02379

912-02190

912-02381 4X8MM SCREW(4 REQ.)

893-01153

861-00423 825-00064

903-00418 903-00418 AM 2ND DETECTOR DIODE

903-00419 FM OVERLOAD DIODE

903-00418 822-02930 15pF ±5% 50V CERAMIC CAP 822-02931 0.01uF +100-0% 50V CERAMIC CAP

822-02931 822-02379

822-02570 100pF ±5% 50V CERAMIC CAP

AM ANTENNA HOLDER BRACKET ANTENNA TERMINAL STRIP

JACK CLUSTER (PHONO CER. L R, AUX

2 REQ.)

DIAL CORD TENSION SPRING

CABINET RETAINING WASHER (4 REQ.)

3MM SCREW (RETAINS REF. NO. 46,

812-1209, AM ANTENNA BRACKET)

3MM NUT (USED ON REF. NO. 61,

912-2188)

TOOTHED LOCKWASHER(PART OF REF.

NO.

6.35MM NUT(RETAINS REF. N0.64, 886-337.STUD.& REF.NO.66,893-1093)

8MM TOOTHED LOCKWASHER(RETAINS

REF.

3X8MM ROUND HEAD SCREWJ2 MT.

REF.

3X10MM ROUND HEAD SCREW( 4 REQ) 3X15MM RND HEAD SCREW (4 USED,

2 EA. REF. NO. 32, SINK, & Ref No 33, 926-354, HT SINK)

3X1OMM SCREWM8 REQ) 3X8MM SCREW(4 RETAIN REF. NO. 97

844-226, JACK CLUSTER)

3X6MM SCREW (31 REQ.)

3X6MM SCREW(2 RETAIN REF. NO. 99,

878-115, AC SOCKET)

2.6X4MM SCREWJMTS. REF. NO. 47, 817-311.

SPECIAL SCREW(RETAINS REF. NO. 50

844-222, JACK CLUSTER)

4X8MM SCREW(4 RETAIN REF. NO. 59

966-109, CABINET FOOT)

7MM WASHER(4 REQ.) 3MM HEX NUT 8 REQ.)

16MM PULLEY(2 REQ.) PULLEY RETAINING PIN( 4 REQ.) DE-EMPHASIS PCB ASSEM (PCB

SWITCH & CAPACITORS)

SPEAKER QUICK CONNECTORS

(AL&R-BL&R2 REQ.)

DE-EMPHASIS SLIDE SWITCH (PART OF

REF.

A.C.

FM AFC DIODE AM 1ST DETECTOR DIODE AM AGC DIODE

FM TUNING METER DIODE FM MULTIPLEX SWITCHING DIODE

0.01uF +100-0% 50V CERAMIC CAP 4700pF ±20% 50V CERAMIC CAP 10DF

0.75pF ±0.25pF 50V GIMMICK CAP

DESCRIPTION

IN L R & TAPE IN L R, TAPE OUT L R

64,886-337, GROUND STUD)

NO. 64,886-337, STUD)

NO. 23,998-54, REFLECTOR)

926-391,

DE EMPHASIS SW. CLAMP)

NO. 96 804-725 PCB ASSEMBLY)

SOCKET

±0.5DF

50V CERAMIC CAP

HEAT

24

AUDIO MODEL MC7031W (Cont')

REFNO PART NO DESCRIPTION

C017

C018 C020 822-02931 C021 822-02497 C022 C101 822-02576 C102 822-02367 C103 822-02586 330pF ±5% 50V POLYSTYRENE CAP C104 822-02506 0.01 uF ±5% 50V MYLAR CAP C105 C106 C107 822-02497 C108 822-02497 C109 C110 cm 822-02497 C112 C113 C114 C115 C116 C117 C118 822-02497 C119 C120 C121 C122 822-02585 C123 C124 C125 822-02417 C126 822-02368 10pF ±0.5pF 50V CERAMIC CAP C127 822-02417 C201 822-02379 4700pF ±20% 50V CERAMIC CAP C202 C203 822-02497 C204 C205 822-02379 C206 C207 C208 C209 C210 822-02497 C211 822-02584 C212 822-02497 C213 C214 C215 822-02405 C216 822-02497 C217 C218 822-02417 C219 C220 822-02523 220uF 35V ELECTROLYTIC C301 C302 C303 C305 C306 C307 C308 022-02577

C356 822-02505 C357 C358

C519 C520 C521 C522 C523 C901 C902 C903 822-02414 C904 C905 C906 C907 C908 C909

C910 C951 C952 C953 C954 C955 C956 C957 C958 C960 IC201 IC301 IC901 IC951 LPF301 LPF351 L001 820-01179 L002

822-02379

822-02370

822-02379 4700pF ±20% 50V CERAMIC CAP

822-02407 100uF 16V ELECTROLVTIC 822-02379

822-02417 822-02580

822-02497 822-02580 822-02366 822-02500 822-02408 822-02506

822-02497 822-02506 822-02936 0.1uF 50V MYLAR CAP

822-02686 822-02404

4700PF

±20% 50V

33pF ±5% 50V CERAMIC CAP

0.01uF

+10^% 50V CERAMIC CAP

0.022juF

+80-20% 50V CERAMIC CAP

4700pF ±5% 50V MYLAR CAP 7pF ±0.5pF 50V CERAMIC CAP

4700pF ±20% 50V CERAMIC CAP

0.022uF

+8^20% 50V CERAMIC CAP

0.022uF

+8^20% 50V CERAMIC CAP

1uF 50V ELECTROLYTIC

0.047uF

±5% 50V MYLAR CAP

0.022uF

+80-20% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

0.047uF

±5% 50V MYLAR CAP

3pF ±0.25pF 50V CERAMIC CAP

0.001uF

±5% 50V MYLAR CAP

220uF 16V ELECTROLYTIC

0.01uF

±5% 50V MYLAR CAP

0.022uF

+80-20% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

0.01uF

±5% 50V MYLAR CAP

3300pF ±5% 50V MYLAR CAP

0.047uF

+80-20% 50V CERAMIC CAP

4.7uF

16V ELECTROLYTIC

1uF 50V ELECTROLYTIC

CERAMIC

CAP

1uF 50V ELECTROLYTIC 822-02497 822-02496 822-02931

822-02497 822-02497 822-02417

822-02497 822-02497

822-02408 822-02417 822-02513 470pF ±5% 50V POLYSTYRENE CAP

822-02529 822-02530 822-02580 822-02505 822-02593

822-02593 822-02577

822-02497 822-02523 220uF 35V ELECTROLYTIC 822-02523 220uF 35V ELECTROLYTIC 822-02523 822-02590 470uF 35V ELECTROLYTIC 822-02593 822-02568

822-02583 822-02588 822-02413 822-02502 822-02582 8200pF ±5% 50V MYLAR CAP 822-02414 822-02570 100pF ±5% 50V CERAMIC CAP 822-02593 822-02568 822-02414 822-02583 220pF ±5% 50V CERAMIC CAP 822-02588 822-02413 10uF 25V ELECTROLYTIC 822-02502 822-02582 8200pF ±5% 50V MYLAR CAP 822-02570 905-00143 FM F INTEGRATED CIRCUIT 905-00135 FM MULTIPLEX DECODER INTEGRATED

905-00136 R. CHANNEL PHONO EQUALIZER IC

905-00136 L. CHANNEL PHONO EQUALIZER IC 905-00157 905-00157

820-01199

0.022uF

+80-20% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

1000pF ±20% 50V CERAMIC CAP

4700pF ±20% 50V CERAMIC CAP

0.01uF

+100-0% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

1uF 50V ELECTROLYTIC

0.022uF

+80-20% 50V CERAMIC CAP

330pF ±5% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

10uF 16V ELECTROLYTIC

0.022uF

+80-20% 50V CERAMIC CAP

220uF 16V ELECTROLYTIC

1uF 50V ELECTROLYTIC 1uF 50V ELECTROLYTIC

1uF 25V ELECTROLYTIC

0.33uF

25V ELECTROLYTIC

0.047uF

±5% 50V MYLAR CAP

0.0068uF

4.7uF

0.012uF

0.0068uF

4.7uF

0.012uF

0.022uF

±5% 50V MYLAR CAP

50V ELECTROLYTIC

±5% 50V MYLAR CAP (PART OF

REF.NO. 96 804725 PCB ASSEMBLY)

±5% 50V MYLAR CAP

50V ELECTROLYTIC

±5% 50V MYLAR CAP (PART OF

REF.

NO. 96 804-725 PCB ASSEMBLY)

+80-20% 50V CERAMIC CAP

220uF 35V ELECTROLYTIC

4.7uF

50V ELECTROLYTIC

47pF ±5% 50V CERAMIC CAP

100uF 25V ELECTROLYTIC 220pF ±5% 50V CERAMIC CAP 100uF 6.3V ELECTROLYTIC 10uF 25V ELECTROLYTIC

0.0027uF

±5% 50V MYLAR CAP

100uF 25V ELECTROLYTIC

4.7uF

50V ELECTROLYTIC

47pF ±5% 50V CERAMIC CAP

100uF 25V ELECTROLYTIC 100uF 6.3V ELECTROLYTIC

0.0027uF

±5% 50V MYLAR CAP

100pF ±5% 50V CERAMIC CAP

R.CHANNEL L. CHANNEL FM LOW PASS FILTER

FM ANTENNA COIL FM RF COIL

FM LOW PASS FILTER

REFNO

L003 L004 820-01146 FM OSCILLATOR COIL L203 820-01129

L204 820-01127 Q001 921-01108 Q002 Q003 921-01059 FM OSCILLATOR TRANSISTOR NPN Q101 Q102 921-01081 AM 1ST IF TRANSISTOR NPN Q103 921-01081 Q201 921-01060 Q301 921-01081 STEREO LAMP DRIV'R TRANSIST'R NPN Q302 921-01102 Q352 921-01102 L. CHAN MULTIPLEX FILT'R TRANS PNP

R001 863-02686 100KΩ

R002 863-02501 100Ω

R003

R004

R005 863-02463

R006 863-02687 220KΩ

R007 863-02498

R008 863-02685

R009

R010

R011

R012

R013 863-02681 22Ω

R014

R101 863-02463

R102

R103 863-02587 15KΩ

R104 863-02492 150KΩ

R105 863-02471 2200Ω

R106 863-02584 330Ω

R107 863-02469 1 KΩ

R108 863-02464 220Ω

R109 863-02475 4700Ω

R110 863-02469 1 KΩ

R111 863-02471 2200Ω

R112 863-02465 390Ω

R113 863-02475 4700Ω R114

R115 863-02488 R116 863-02478 8200Ω

R117

R118 863-02475

R119 863-02471 2200Ω

R120 863-02588

R121 863-02486 56KΩ

R122 863-02466 470nΩ

R123 863-02488

R124 863-02469 1KnΩ

R201 863-02466 470Ω

R202 863-02585 680Ω

R203 863-02470 1800Ω

R204 863-02465 390Ω

R205 863-02584 330Ω

R206

R207 863-02488 R208 863-03048 22KΩ ROTARY METER CONTROL

R209 863-02481 18KΩ

R210

R211 863-03005 47KΩ ROTARY FM MUTE CONTROL

R212 863-02476

R213

R214 863-02471 2200Ω

R215 863-02466

R216 863-02688

R301 863-02488

R302 863-02481 18KΩ

R303 863-02701

R304 863-02488 100KΩ

R305 863-02474 3300Ω R306 863-02476 5600Ω R307 R308 863-02586 3900Ω R309 863-02475 4700Ω R310 863-02477 6800Ω R311 863-02468 820Ω R312 863-02474 R313 863-03005 47KΩ ROT'RY FM SEP'RATION R315 863-02492 150KΩ R358 863-02586 3900Ω R359 R360 863-02477 6800Ω R361 863-02468 820Ω R362 863-02474 3300Ω R407 863-02467 560Ω R423 863-02685 18KΩ R457 R473 R507 R901 863-02471 2200nΩ±5% 1/4W CARBON FILM RES R902 863-02488 100KΩ R903 863-02488 100KΩ

PART NO

820-01127

921-01059

2.2uH 18UH CHOKE

2.2UH FM RF AMPLIFIER TRANSISTOR FET FM MIXER TRANSISTOR NPN

921-01081 AM RF AMPLIFIER-MIXER TRANS NPN

AM 2ND IF TRANSISTOR NPN FM IF TRANSISTOR NPN

R.CHAN

863-02686 100KΩ

863-02500

863-02682 863-02596 863-02684 12KΩ 863-02683

863-02501 863-02489

863-02463

863-02469

47Ω

100Ω

3300Ω

18KΩ 1KΩ

6800Ω 820Ω

100Ω 100Ω 120KΩ

100Ω 100KΩ

1 KΩ

4700Ω 68KΩ

100KΩ

863-02584 330Ω

100KΩ

863-02477 6800Ω

863-02479 10KΩ

863-02470

5600Ω

470Ω 680KΩ 100KΩ

4700Ω ROTARY MULTIPLEX

DEMODULATOR

1800Ω

3300Ω

863-02475 4700Ω

863-02467 560Ω 863-02685 863-02473 2700Ω

18KΩ

DESCRIPTION

CHOKE

MULTIPLEX FILTER TRANS PNP

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 1 /4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1 4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% ±5% ±5% ±5% ±5% ±5% ±5%

±5%

±5% ±5%

±5% ±5% ±5%

±5%

±5% ±5%

±5%

CONTROL

1/4W CARBON FILM RES

1/4W CARBON FILM RES 1/4W CARBON FILM RES 1 4W CARBON FILM RES 1/4W CARBON FILM RES 1/4W CARBON FILM RES 1/4W CARBON FILM RES

1/4W CARBON FILM RES

1/4W CARBON FILM RES 1/4W CARBON FILM RES 1/4W CARBON FILM RES 1/4W CARBON FILM RES

1/4W CARBON FILM RES

1/4W CARBON FILM RES 1/4W CARBON FILM RES 1/4W CARBON FILM RES 1/4W CARBON FILM RES

1/4W CARBON FILM RES 1/4W CARBON FILM RES

1/4W CARBON FILM RES

C'NTROL

25

AUDIO MODEL MC7031W (Cont')

REF NO

R904 863-02494 R905 R906 R907 863-02678 R908 863-02483 R909 863-02694 330KΩ R910 863-02485 R911 R912 863-02469 1 KΩ R951 863-02471 R952 863-02488 100KΩ R953 R954 863-02494 R955 863-02585 680Ω R956 863-02475 R957 863-02678 82Ω R958 863-02483 R959 863-02694 R960 863-02485 R962 863-02469 1 KΩ T101 T102 T103 T104 T201 895-01062 T202 895-01067 Y201 905-00145 Y202 Y203 905-00145 0094 NON STOCK

PREAMPLIFIER PRINTED CIRCUIT BOARD COMPONENTS

C019 C402 C403 C404 C405 822-02491 C406 822-02934 C407 C408 C409 822-02507 C410 C411 C412 822-02582 C413 822-02577 C414 C452 822-02935 C453 C454 822-02933 470PF ±5% 50V CERAMIC CAP C455 C456 822-02934 C457 C458 822-02934 C459 C460 C461

C462 C463 C464 Q401 Q402 Q451 Q452

R401 863-02479 10KΩ

R402

R403

R404 R405 863-02474

R406 R408 R409 R410 863-02471 R411 R412 863-02471 2200Ω R413 R414 R415 R416 R417 R418 863-02474 R419 863-02474 R420 863-02592 R421 R422 R451 R452 R453 R455 863-02474 3300Ω R458 R459 R460 863-02471 R461 R462 R463 R466 R466

PART NO DESCRIPTION

1 MΩ

±5% 863-02585 680Ω 863-02475

863-02463 100Ω

863-02488

820-01148 895-01068 895-01048 AM IF TRANSFORMER (WHITE) 895-01049

905-00145

822-02491 15pF ±5% 50V CERAMIC CAP 822-02935 822-02610 1uF ±20% 50V ELECTROLYTIC 822-02933

822-02587 822-02934

822-02578 822-02500 0.001 uF ±5% 50V MYLAR CAP

822-02576 4700pF ±5% 50V MYLAR CAP 822-02610 822-02491 15pF ±5% 50V CERAMIC CAP 822-02587 822-02507

822-02578 822-02500 0.001 uF ±5% 50V MYLAR CAP 822-02582 822-02577 822-02576 4700pF ±5% 50V MYLAR CAP

921-01103 R. CH TONE CONTROL AMP TRANS NPN

921-01103 921-01103 L.CH TONE CONTROL AMP TRANS NPN 921-01103 L.CH 1ST AUDIO PREAMP TRANS NPN

863-02475 863-02474

863-03109

863-03046 863-02592 863-02485

863-02714 863-02482

863-03047 863-02474 863-02480 12KΩ 863-03047

863-03049 1500Ω

863-02486 863-02479 10KΩ 863-02475 863-02474

863-02592 863-02485

863-02714 863-02471 2200Ω 863-02482 863-02474 863-02480 12KΩ

4700Ω 82Ω 27KΩ

47KΩ

2200Ω 100KΩ

1 MΩ 4700Ω 27KΩ

330KΩ 47KΩ

AM OSCILLATOR COIL AM IF TRANSFORMER

AM IF TRAMSFORMER (BLACK)

FM IF TRANSFORMER FM IF TRANSFORMER

10.7 MHZ CERAMIC FILTER

TUNER PRINTED CIRCUIT BOARD

0.12uF 470pF ±5% 50V CERAMIC CAP

15pF ±5% 50V CERAMIC CAP 33uF 35V ELECTROLYTIC 33uF 6.3V ELECTROLYTIC 33uF 35V ELECTROLYTIC

0.015uF

0.068uF 8200pF ±5% 50V MYLAR CAP

0.012uF

0.12uF 1uF ±20% 50V ELECTROLYTIC

33uF 35V ELECTROLYTIC 33uF 6.3V ELECTROLYTIC 33uF 35V ELECTROLYTIC

0.015uF

0.068uF

8200pF ±5% 50V MYLAR CAP

0.012uF

R. CH 1ST AUDIO PREAMP TRANS NPN

4700Ω 3300Ω 100KΩ DUAL TAPP'D ROT'RY VOL CONT. 3300Ω 250KΩ DUAL ROTARY CONTROL-BAL 470KΩ 47KΩ 2200Ω 39KΩ

22KΩ

100KΩ DUAL ROTARY BASS CONTROL

3300nΩ±5% 1/4W CARBON FILM RES

100KΩ DUAL ROT'RY TREBLE

3300Ω 3300Ω ±5% 1/4W CARBON FILM RES 470KΩ

56KΩ 4700Ω

3300Ω 470KΩ

47KΩ 2200Ω 39KΩ

22KΩ 3300Ω

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 50V MYLAR CAP

±5% 50V MYLAR CAP ±5% 50V MYLAR CAP

±5% 50V MYLAR CAP

±5% 50V MYLAR CAP ±5% 50V MYLAR CAP

±5% 50V MYLAR CAP

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W- CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

C'NTROL

REF NO

R468 R469 863-02474 3300Ω R470 863-02592 470KΩ

R472 863-02486 S002 885-00580 FM AFC PUSH SWITCH S003 885-00580 S004 S005 S006 885-00594 HI-FILTER PUSH SWITCH S007 885-00594 LO-FILTER PUSH SWITCH S008 885-00580 MONITOR(SOURCE-TAPE) SWITCH 0093 NON STOCK

CR1401 CR1402 903-00384 R. CHANNEL AMPLIFIER BIAS DIODE CR1403 903-00384 CR1404 903-00384 CR1451 903-00364 12 VOLT 1 WATT ZEN ER DIODE CR1452 903-00384 L. CHANNEL AMPLIFIER BIAS DIODE CR1453 903-00384 L. CHANNEL AMPLIFIER BIAS DIODE CR1454 903-00384 L. CHANNEL AMPLIFIER BIAS DIODE CR501 903-00428 RECTIFIER DIODE CR502 903-00428 RECTIFIER DIODE CR503 903-00379 RECTIFIER DIODE CR504 903-00379 RECTIFIER DIODE CR505 903-00379 RECTIFIER DIODE CR506 903-00379 RECTIFIER DIODE CR508 903-00382 RECTIFIER DIODE CR515 903-00382 RECTIFIER DIODE C1401 C1402 822-02584 330pF ±5% 50V CERAMIC CAP C1403 C1404 C1405 822-02569 68pF ±5% 50V CERAMIC CAP C1406 822-02626 120pF ±5% 50V CERAMIC CAP C1407 822-02366 3pF ±0.25pF 50V CERAMIC CAP C1408 822-02517 47uF 25V ELECTROLYTIC C1409 822-02936 0.1 uF 50V MYLAR CAP C1410 822-02931 C1411 C1412 C1414 C1451 822-02524 C1452 822-02584 330pF ±5% 50V CERAMIC CAP C1453 822-02417 1uF 50V ELECTROLYTIC C1454 822-02406 47uF 16V ELECTROLYTIC C1455 822-02569 68pF ±5% 50V CERAMIC CAP C1456 822-02626 120pF ±5% 50V CERAMIC CAP C1457 822-02366 3pF ±0.25pF 50V CERAMIC CAP C1458 822-02517 47uF 25V ELECTROLYTIC C1459 822-02936 0.1 uF 50V MYLAR CAP C1460 822-02931 C1461 822-02931 C1462 822-02936 0.1 uF 50V MYLAR CAP C1463 C1464 822-02931 C304 822-02524

C401 822-02932 390pF ±5% 50V CERAMIC CAP C451 822-02932 390pF ±5% 50V CERAMIC CAP C501 822-02686

C502 822-02686 C503 822-02408 C504 C505 822-02497 C506 C507 822-02408 220uF 16V ELECTROLYTIC C508 822-02408 220uF 16V ELECTROLYTIC C509 822-02685 470uF 25V ELECTROLYTIC C510 C511 C512 822-02497 C513 822-02498 0.01F ±20% 500V CERAMIC CAP C514 822-02498 C515 822-02498 C516 822-02498 Q1401 921-01103 Q1402 921-01102 R. CHANNEL BIAS TRANSISTOR PNP Q1403 921-01102 R. CHANNEL BIAS TRANSISTOR PNP Q1404 Q1405 921-01104 Q1406 921-01187 Q1407 921-01063

Q1408 921-01102 Q1409 921-01187

Q1410 Q1411 921-01100 R.CH POWER OUTPUT TRANS NPN Q1412 Q1451 921-01103 L.CH DIFFERENTIAL AMP TRANS NPN Q1452 921-01102 Q1453 921-01102 Q1454 921-01103 L.CH 2ND DIF'L AMP TRANS NPN

PART NO

863-02474

885-00580 885-00594

POWER AMPLIFIER PRINTED CIRCUIT BOARD

903-00364 12 VOLT 1 WATT ZENER DIODE

822-02524 822-02417 1uF 50V ELECTROLYTIC

822-02406

822-02931 822-02936 822-02931

822-02417 1uF 50V ELECTROLYTIC

822-02408

822-02497

822-02685 822-02497

921-01103

921-01104 R. CHANNEL DRIVER TRANSISTOR PNP 921-01101

3300Ω

56KΩ FM MUTE PUSH SWITCH

LOUDNESS PUSH SWITCH MODE( STEREO-MONO) PUSH SWITCH

PCB ASSEMBLY

COMPONENTS

R.CHANNEL R.CHANNEL

0.47uF

47uF 16V ELECTROLYTIC

0.01uF

0.1 uF 50V MYLAR CAP

0.01uF

0.47uF

0.01uF

0.47uF

0.047uF

0.047uF 220uF 16V ELECTROLYTIC 220uF 16V ELECTROLYTIC

0.022uF

470uF 25V ELECTROLYTIC

0.022uF

0.01uF

0.01uF R.CH DIFFERENTIAL AMP TRANS NPN

R.CH 2ND DIFF'R'NTL AMP TRANS NPN R.CHANNEL R.CHANNEL R.CHANNEL 1 ST TEMPERATURE

COMPENSATION TRANS NPN

R. CHANNEL 2ND TEMPERATURE

COMPENSATION TRANSISTOR NPN

R.CHANNEL

R.CH POWER OUTPUT TRANS PNP L.CHANNEL

L.CHANNEL

DESCRIPTION

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

ROTARY SPEAKER SELECT SWITCH

AMPLIFIER BIAS DIODE AMPLIFIER BIAS DIODE

50V ELECTROLYTIC

+100-0% 50V CERAMIC CAP +100-0% 50V CERAMIC CAP

+100-0% 50V CERAMIC CAP

50V ELECTROLYTIC

+100-0% 50V CERAMIC CAP +100-0% 50V CERAMIC CAP

+100-0% 50V CERAMIC CAP

50V ELECTROLYTIC

+80-20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP

±20% 500V CERAMIC CAP ±20% 500V CERAMIC CAP ±20% 500V CERAMIC CAP

PREDRIVER TRANS PNP BIAS TRANSISTOR NPN

DRIVER TRANSISTOR NPN

BIAS TRANSISTOR PNP BIAS TRANSISTOR PNP

26

REF NO PART NO

Q1455 921-01104 Q1456 921-01187 Q1457 Q1458 921-01102 Q1459 921-01187

Q1460 921-01104 Q1461 Q1462 921-01101 Q501

Q502 921-01107

R1401

R1402 863-02591

R1403

R1404 863-02677

R1405 863-02479

R1406 863-02677

R1407 863-02471

R1408

R1409 363-02591

R1410

R1411 863-02469

R1412 863-02856

R1413

R1414

R1415

R1416 863-02468

R1417

R1418

R1419 863-02464

R1420 863-02464

R1421

R1422

R1423

R1424 863-02693 10Ω

R1425 863-02689

R1451 863-02593 560KΩ

R1452 863-02591

R1453

R1454 863-02677

R1455

R1456 863-02677 200Ω

R1457 863-02471 2200Ω

R1458

R1459 863-02591 82KΩ

R1460 863-02676 68Ω

R1461

R1462 863-02856

921-01063

921-01100 L.CH POWER OUTPUT TRANS NPN

921-01106 VOLTAGE REGULATOR TRANS NPN 863-02593 863-02469

863-02470 863-02676 68Ω

863-03110 270Ω 863-02475 4700Ω 863-02680

863-02468 820Ω 863-02456

863-02456 220Ω ±5% 1/2W CARBON FILM RES 863-02690 863-02690

863-02469 1KΩ 863-02479 10KΩ

863-02470 1800Ω

863-02469 1KΩ

L.CHAN L.CHANNEL L.CH 1 ST TEMP COMP TRANS NPN L.CH 2ND TEMP COMP TRANS NPN L.CHANNEL L.CHANNEL

L.CHAN VOLTAGE REGULATOR TRANS PNP

560KΩ 82KΩ 1KΩ 200Ω 10KΩ 200Ω 2200Ω 1800Ω 82KΩ

±5% 1KΩ 470Ω ROTARY R.CH BIAS CONTROL

1500Ω 820Ω

220Ω 220Ω 220Ω

0.27Ω

±10%

6.8Ω 82KΩ 200Ω

±5% 470Ω ROTARY L.CH BIAS CONTROL

AUDIO MODEL MC7031W (Cont')

DESCRIPTION

PREDRIVER TRANSISTOR PNP

BIAS TRANSISTOR NPN

DRIVER TRANSISTOR NPN DRIVER TRANSISTOR PNP

POWER OUTPUT TRANS PNP

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1 4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

2W METAL FILM RES

±5%

2W METAL FILM RES

1W METAL FILM RES

±5%

1W WIREWOUND RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1 4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

REF NO

R1463 R1464 863-02475 4700Ω R1465 863-02680 1500Ω R1466 863-02468 820Ω R1467 863-02468 820Ω ±5% 1/4W CARBON FILM RES R1468 863-02456 220Ω R1469 863-02464 220Ω ±5% 1/4W CARBON FILM RES R1470 863-02464 220Ω R1471 863-02456 220Ω R1472 863-02690 R1473 863-02690 R1474 863-02693 10Ω R1475 863-02689 6.8Ω R501 863-02691 27Ω R502 863-02475 4700Ω R503 863-02725 270Ω R504 863-02475 4700Ω R507 R509 863-02707 22Ω R510 863-02473 2700Ω 0095 NON STOCK AUDIO PRINTED CIRCUIT BOARD

0091 804-729 LED PRINTED CIRCUIT BD ASSEMBLY

CR302 CR510 903-00386 RED FUNCTION INDICATOR LED (AUX) CR511 903-00386 RED FUNCT'N INDICATOR LED (PHONO) CR512 903-00386 RED FUNCTION INDICATOR LED (FM) CR513 903-00386 RED FUNCTION INDICATOR LED (AM)

PARTS NOT REFERENCED ON EXPLODED VIEW:

IF TRANSFORMER

PART NO DESCRIPTION

863-03110 270Ω

863-02473

903-00385

202-04403 OPERATING GUIDE, INSTRUCT'N BOOK

926-00385

812-01293 CABINET BRACKET 893-01157 WASHER, 1.5MM (4 REQ.) 886-00344 TERMINAL

±5%

1/4W CARBOM FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

0.27Ω

2700Ω

COMPONENTS

GREEN STEREO INDICATOAPE)

SHIELD (USED ON REF. NO. T103 & T104

1/2W CARBON FILM RES

±5%

2W METAL FILM RES

±5%

2W METAL FILM RES

±10%

1W METAL FILM RES

±5%

1W WIREWOUND RES

±10%

1W METAL FILM RES

±5%

1/4W CARBON FILM RES

±10%

1W METAL FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

PRODUCTION CHANGES

EARLY PRODUCTION

REF NO

Q501 921-01106 VOLTAGE REGULATOR, NPN

R309 R359

PART NO DESCRIPTION

863-02475 863-02475 4700Ω

4700Ω

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

LATE PRODUCTION

REF NO

Q501

R309 863-02471 2200Ω R359 863-02471 2200Ω

PART NO DESCRIPTION

921-01167 VOLTAGE REGULATOR, NPN

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

27

AUDIO MODEL MC7041

REF NO PART NO DESCRIPTION

CABINET COMPONENTS

CR507 903-00382 CR508 903-00382 RECTIFIER DIODE C517 822-02632 C518 822-02632 C911 822-02698 39pF ±5% 50V CERAMIC CAP C961 DS501 900-00322 DS502 DS503 900-00322 PILOT LAMP, 300MA, DIAL SCALE DS504 F1401 936-00070 R CH 3.5 AMP SPKR PROTECTION FUSE F1451 936-00070 L CH 3.5 AMP SPKR PROTECTION FUSE F501 936-00071 F502 936-00068 F503 936-00081 F504 J001 844-00224 L111 820-01147 AM ANTENNA COIL M101 922-00067 M102 922-00062 AM SIGNAL METER P501 811-00218 AC LINE CORD Q503 921-01168

Q504 R1428 863-02692

R1478 863-02692 R512 R913 863-02496 R914 863-02721 R963 R964 863-02721 1.2MΩ S001 885-00627 ROTARY FUNCTION SWITCH (AM, FM,

S009

S501 885-00577 AC POWER LEVER SWITCH T501 895-01109 POWER TRANSFORMER 0001 814-01032 WOOD CABINET 0002 804-00605 CHASSIS BOTTOM (COVER) 0003 857-01680 FRONT PANEL 0004 804-00751 CHASSIS REAR(REAR MTG. PLATE) 0005 804-00752 CHASS FRONT (FRONT MTG. BRACKET) 0006 846-01044 TUNING KNOB 0007 846-01094 CONT. KNOB (SPKR & FUNCTN 2 REQ) 0008 846-01097 CONTROL KNOB (BASE, TREBLE,

0009 846-01065 CONTROL KNOB (8 REQ.) 0010 992-00213 DIAL SCALE LENS 0011 824-00549 0012 826-00207 TUNING DIAL SCALE 0013 812-01211 DIAL SCALE LEFT MTG BRACKET 0014 812-01210 DIAL SCALE RIGHT MTG BRACKET 0015 857-01681 ZENITH NAME PLATE 0016 883-01052 0017 812-01212 TUNING METER MTG BRACKET 0018 812-01310 LED LAMP RETAINING BRACKET 0019 0020 876-00565 TUNING KNOB SHAFT 0021 841-00234 PILOT LAMP HOLDER (4 REQ.) 0022 998-00054 0023 883-01042 LEVER SWITCH MASKING STRIP (8 REQ) 0024 812-01311 POWER SWITCH MTG BRACKET 0025 812-01340 HEAD PHONE JACK MTG BRACKET 0026 812-01341 0027 812-01342 SWITCH BRACKET(MTS. S2, S4, & S8) 0028 859-00306 DIAL POINTER 0029 859-00307 0030 833-00215 CHASSIS MTG FRAME (2 REQ.) 0031 833-00214 POWER TRANSISTOR HEAT SINK 0032 926-00359

0033 0034 894-00314 POWER TRANSISTOR INSULATING

0035 880-01223 SPRING (2 REQ.) 0036 812-01207 0037 883-01022 5 LUG TERMINAL STRIP (2 REQ.) 0038 886-00335 0039 0040 811-00217 WIRE TIE STRAP(USED ON AC CORD) 0041 817-00307 0042 824-00575 SPEAKER FUSE COVER 0043 862-00005 SPKR FUSE HOLDER (MTS. F1401

0044 841-00226 AM ANTENNA HOLDER 0045 947-00126

0046 812-01209 AM ANTENNA MTG BRACKET 0047 817-00311 0048 883-01036 0049

REQ.)

0050 844-00222 JACK CLUSTER (PHONO MAG. L R) 0051 0052 926-00392

20204404 IN STRUCTION BOOK

822-02698 39pF ±5% 50V CERAMIC CAP 900-00322 PILOT LAMP, 300MA, DIAL SCALE 900-00322 PILOT LAMP, 300MA, DIAL SCALE

936-00081 5 AMP PIGTAIL FUSE

921-01167

863-02458

863-02496

885-00615 ROTARY SPKR SELECT SWI (A, B, A+B)

812-01213 LED MTG BRKT (MTS REF NO 89,& 18)

926-00360

812-01208 FILTER CAPACITOR BRACKET( 2 REQ.)

844-00223

812-01240

RECTIFIER DIODE 6800uF 35V ELECTROLYTIC

6800uF 35V ELECTROLYTIC

PILOT LAMP.300MA.DIAL SCALE

0.5 AMP SLO-BLO PIGTAIL FUSE 2 AMP PIGTAIL FUSE

5 AMP PIGTAIL FUSE

HEADPHONE JACK

FM TUNING METER

PHONO EQUALIZER 1ST VOLTAGE

REGULATOR TRANSISTOR NPN

PHONO EQUALIZER 2ND VOLTAGE

REGULATOR TRANSISTOR NPN

330Ω

±10%

330Ω

2.2MΩ

3.3MΩ

1.2MΩ

3.3MΩ

PHONO.& AUX)

BALANCE & VOLUME 4 REQ.)

TUNING SHAFT RETAINING COVER

TUNING METER RETAINING STRIP

REFLECTOR

SWITCH BRKT (MTS. REF. NOS.S5-S7)

DIAL POINTER GUIDE

POWER TRANSISTOR HEAT SINK HEAT SINK

BUSHING (8 REQ.) CAP MTG BRKT (MTS. C517&C518) 2 LUG TERMINAL

AC CORD RETAINING CLAMP

& F1451)

VINYL SPACE RING (USED ON REF. NO.

46,

DE-EMPHASIS SWITCH BRKT CLAMP ANTENNA TERMINAL STRIP JACK CLUSTER (PHONO. TAPE & AUX 2

TONE CONTROL MTG BRACKET TUNING CAPACITOR SHIELD

1W METAL FILM RES

±10%

1W METAL FILM RES

±5%

1/2W LINE ISOLATION RES

±5%

1/4W CARBON FILM RES

±5% 1 /4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

812-1209, ANTENNA BRACKET)

REF NO

0053 926-00356 0054

0055 874-00053 VENTILATION SCREEN 0056 861-00481 VARIABLE TUNING CAPACITOR 0057 880-01287 DIAL CORD TENSION SPRING 0058 893-01182 CABINET RETAINING WASHER(4 REQ.) 0059 886-00329 CHASSIS GROUND LUG 0060 861-00447 12X4.2MM PULLEY(2 REQ.) 0061 825-00064 PULLEY RETAINING PIN (4 USED) 0062 861-00482 CORD PULLEY GUIDEJ 2 USED) 0063 912-02188 3MM SCREW (MTS. REF. NO. 44) 0064 854-00319 3MM NUT (USED WITH REF. NO. 63) 0065 897-00310 PHONO GND POST (PT OF REF. NO. 88) 0066 912-02190 JACK CLUSTER MTG SCREW(6 REQ.) 0067 893-01093 8MM LOCKWSHR (USED ON REF NO 65) 0068 854-00345 0069 912-02149 3X6MM SCREW(16 REQ.) 0070 912-02150 3X8MM SCREW (2 MT REF.NO. 22) 0071 912-02151 3X1OMM SCREW(2 REQ.) 0072 912-02154 3X15MM TSTR MTG SCREW (8 REQ.) 0073 912-02159 3X8MM SCREW (4 MT. REF. NO. 97) 0074 912-02208 3X10MM SCREW(16 REQ.) 0075 0076 912-02185 0077 912-02181 3X6MM SCREW (34 REQ.) 0078 912-02241 3X12MM SCREW (4 USED) 0079 912-02203 3X8MM SCREW (RETAINS REF. NO. 42,) 0080 912-02374 4X16MM SCREW (4 REQ.) 0081 912-02373 4X8MM SCREW (1 U/O EA REF. NO. 87) 0082 912-02375 4X12MM SCREW (4 REQ.) 0083 912-02379 3X6MM SCREW (4 MT REF. NO. 33) 0084 854-00348 3MM HEX HEAD NUT (4 USED) 0085 854-00346

0086 912-02191 3X8MM SCREW (2 MT FRONT PANEL) 0087 966-00109 CABINET FOOT (4 REQ.) 0088-A 886-00363 MAGNETIC PHONO GROUND STUD 0088-B 893-01215 TOOTHED WSHR (USED ON REF NO 88) 0094 804-00725

0095 885-00578 0096 878-00115 A C SOCKET

0097 844-00221 SPEAKER QUICK-CONNECT TERMINAL)

TUNER PRINTED CIRCUIT BOARD COMPONENTS

CR001 CR101 903-00418 AM IF DIODE CR102 903-00418 AM 1ST DETECTOR DIODE CR103 903-00418 AM 2ND DETECTOR DIODE CR104 CR105 903-00384 AM OVERLOAD DIODE CR201 903-00430 CR202 903-00430 FM OVERLOAD DIODE CR203 903-00430 FM SWITCHING DIODE CR301 903-00418 FM IF DIODE C001 822-02852 VARIABLE TUNING CAPACITOR C002 822-02930 15pF ±5% 50V CERAMIC CAP C003 822-02570 100pF ±5% 50V CERAMIC CAP C004 822-02931 C005 822-02931 C006 822-02379 4700pF ±20% 50V CERAMIC CAP C007 822-02368 10pF ±0.5pF 50V CERAMIC CAP C008 822-02930 C009 822-02408 220uF 16V ELECTROLYTIC C010 C011 822-02367 7pF ±0.5pF 50V CERAMIC CAP

C012 822-02570 100pF ±5% 50V CERAMIC CAP C013 822-02561 C014 C015 C016 C017 822-02379 4700pF ±20% 50V CERAMIC CAP C018 C020 C021 822-02497 C022 822-02379 4700pF ±20% 50V CERAMIC CAP C101 822-02576 4700pF ±5% 50V MYLAR CAP C102 822-02367 7pF ±0.5pF 50V CERAMIC CAP C103 C104 822-02506 C105 822-02407 100uF 16V ELECTROLYTIC C106 822-02379 4700pF ±20% 50V CERAMIC CAP C107 822-02497 C108 822-02497 C109 822-02417 1uF 50V ELECTROLYTIC C110 822-02580 cm 822-02497 C112 822-02497 C113 C114 822-02366 3pF ±0.25pF 50V CERAMIC CAP C115 822-02500 0.001 uF ±5% 50V MYLAR CAP C116 822-02408 220uF 16V ELECTROLYTIC C117 822-02931 C118 822-02497 C119

C120 822-02931

PART NO

TUNING CAPACITOR SHIELD

926-00384 TUNING ASSEMBLY SHIELD

6.35MM

912-0*2383

903-00345

903-00384 AM AGC DIODE

822-02497

822-02628 18pF ±5% 50V CERAMIC CAP 822-02853 822-02379 4700pF ±20% 50V CERAMIC CAP

822-02370 33pF ±5% 50V CERAMIC CAP 822-02931

822-02586 330pF ±5% 50V POLYSTYRENE CAP

822-02580

822-02497

2.6X10MM

2.6X4MM

2.6MM

DE-EMPHASIS CIRCUIT BOARD

(WITH COMPONENTS)

DE-EMPHASIS SLIDE SWITCH (PART OF

REF.

FM AFC DIODE

FM AGC DIODE

0.01uF

15pF ±5% 50V CERAMIC CAP

0.022uF

0.75pF 9pF ±0.25pF 50V CERAMIC CAP

0.01uF

0.022uF

0.01uF

0.022uF

0.047uF

0.022uF

0.047uF

0.01uF

0.022uF

0.01uF

DESCRIPTION

NUT (USED ON REF. NO. 65)

SCREW (2 MT. REF. NO. 96)

SCREW (2 MT. REF. NO. 95)

NUT (2 USED WITH REF. NO. 83)

NO. 94)

+100-0% 50V CERAMIC CAP +100-0% 50V CERAMIC CAP

+80-20% 50V CERAMIC CAP

±0.25pF 50V GIMMICK CAP

+100-0% 50V CERAMIC CAP

+80-20% 50V CERAMIC CAP

±5% 50V MYLAR CAP

+80-20% 50V CERAMIC CAP

+80-20% 50V CERAMIC CAP ±5% 50V MYLAR CAP

+80-20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP ±5% 50V MYLAR CAP

+100-0% 50V CERAMIC CAP

+80-20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP

+100-0% 50V CERAMIC CAP

28

AUDIO

REF

NO

C121 C122 822-02585 C123 C124 822-02404 C125 822-02417 C126 822-02368 C127 C1404

C1408 822-02517 C1454 822-02517 C1458 822-02517 47uF C201 822-02379 C202 822-02497 C203 C204 822-02496 C205 C206 C207 822-02497 C208 822-02497 C209 822-02417 C210 822-02497 C211 822-02584 C212 C213 822-02497 C214 822-02497 C215 C216 C217 822-02408 C218 C219 822-02417 C301 C302 822-02530 C303 822-02529 C304 822-02524 C305 822-02580 C306 822-02505 C307 C308 C356 C357 C358 822-02577 C402 822-02935 C452 822-02935 C519 822-02497 C520 822-02523 C521 822-02523 220uF C522 822-02523 C901 822-02593 4.7uF C902 C903 822-02414 C904 822-02583 220pF C905 822-02588 C906 C907 822-02502 C908 822-02582 8200pF C909 822-02414 C910 822-02570 100pF C912 822-02497 C951

C952 C953 822-02414 C954 C955 822-02588 C956 C957 822-02502 C958 C960 822-02570 IC201 905-00143 IC301 IC901 IC951 LPF301 905-00157 LPF351 L001 820-01179 FM ANTENNA COIL L002 820-01145 FM L003 820-01127 L004 820-01146 L203 820-01129 18UH COIL

L204 820-01127 Q001 Q002 Q003 Q101 Q102 921-01081 AM Q103 921-01081 Q201 921-01060 FM 1 ST IF Q301 921-01081 FM STEREO LAMP DRIVER TSTR Q302 921-01102 Q352 921-01102 R001 863-02686 R002 863-02501 100Ω R003 863-02686 100KΩ R004 863-02500 R005 863-02463 100Ω R006 863-02687 220KΩ R007 863-02498 3300Ω

PART

NO

822-02509 0.1uF 822-02686

822-02417

822-02517

822-02497 822-02379

822-02931

822-02497

822-02405 822-02497

822-02417 822-02513 470pF

822-02593 822-02577 822-02505 822-02593 4.7uF

3300pF

0.047uF

4.7uF 1uF 10pF ±0.5dF 1uF

47uF 47uF 47uF

4700pF

0.022uF

0.022uF 1000pF

4700pF

0.01uF

0.022uF

0.022uF 1uF

0.022uF

330pF

0.022uF

10uF

0.022uF

220uF 1uF 1uF

0.33uF

1uF

0.47uF

0.047uF

0.0068uF

4.7uF

0.012uF

0,0068uF

0.012uF

0.12uF

0.022uF

220uF 220uF

822-02568

822-02413

47pF 100uF

100uF 10uF

0.0027uF 100uF

822-02593 4.7uF 822-02568

822-02583 822-02413 10uF 822-02582

905-00135 905-00136 905-00136

905-00157

921-01108 FM 921-01059 921-01059 FM OSCILLATOR TRANSISTOR 921-01060 AM

0.022uF

47pF

100uF

220pF

100uF

0.0027uF

8200pF

100pF FM FM MULTIPLEX DECODER R.

L. R. L.CHANNEL

2.2UH

FM OSCILLATOR COIL

2.2UH

FM MIXER TRANSISTOR

AM

R.CHAN L.CHAN 100KΩ

47Ω

DESCRIPTION

±5% 50V

16V

50V 50V

25V 25V 25V 25V

±20% 50V

±20% 50V ±20% 50V

+100-0%

50V

±5% 50V

16V

16V 50V 50V

±5% 50V

25V

50V

±5% 50V ±5% 50V

35V 35V 35V

50V

+5% 50V

25V ±5% 50V

6.3V

25V

±5% 50V 25V ±5% 50V

50V

±5% 50V

25V ±5% 50V

6.3V

25V

±5% 50V ±5% 50V

IF

INTEGRATED CIRCUIT

CHANNEL PHONO EQUALIZER

CHANNEL

RF

COIL

CHOKE

RF

AMPLIFIER TRANSISTOR

RF

AMPLIFIER-MIXER TSTR 1ST IF 2ND IF

FM

±5%

MYLAR

±5% 50V

+80-20%

ELECTROLYTIC ELECTROLYTIC

+80-20% +80-20%

ELECTROLYTIC

+80-20% +80-20%

+80-20%

ELECTROLYTIC ELECTROLYTIC

ELECTROLYTIC

±5% 50V

+80-20%

+5% 50V

+80-20%

ELECTROLYTIC

±5% 50V

FM

1/4W

MYLAR

50V

ELECTROLYTIC

50V

CERAMIC

ELECTROLYTIC ELECTROLYTIC ELECTROLYTIC ELECTROLYTIC

ELECTROLYTIC

TRANSISTOR

1/4W

CERAMIC 50V 50V

CERAMIC

50V

50V 50V

50V

CERAMIC

50V 50V

ELECTROLYTIC

POLYSTYRENE

ELECTROLYTIC ELECTROLYTIC

MYLAR

MYLAR MYLAR MYLAR

50V

ELECTROLYTIC ELECTROLYTIC ELECTROLYTIC

CERAMIC

ELECTROLYTIC

CERAMIC

ELECTROLYTIC

MYLAR

ELECTROLYTIC

CERAMIC

50V

CERAMIC

ELECTROLYTIC

CERAMIC

ELECTROLYTIC

MYLAR

CERAMIC

FM

MULTIPLEX FILTER

FM

MULTIPLEX FILTER

TRANSISTOR

NOISE FILTER TSTR

1/4W

CARBON FILM

1/4W

CARBON FILM

1/4W

CARBON FILM

1/4W

CARBON FILM

MODEL MC7041 (Cont.)

CAP

CERAMIC

CAP

CAP CERAMIC CERAMIC

CAP CAP

CERAMIC

CERAMIC CERAMIC

CERAMIC

CAP CERAMIC CERAMIC CERAMIC

CERAMIC

CAP

CAP CAP CAP

CERAMIC

CAP

CERAMIC

CAP

I. C.

NPN

RES

CAP

CAP CAP

CAP

CAP CAP

CAP

I. C.

FET

NPN

PNP

RES

RES RES

REF

NO

R011 R012 R013 863-02681 22n R014 R101 863-02463 100n R102

R103 R104

R105 863-02471 2200n R106 330n R107

R108

R109

R110 863-02469 1

R111 R112 R113 863-02475 R1

14 R116 863-02478 R117 R118

R119 863-02471

R120 863-02588 R121 863-02486 56Kn R122 R124 R201 R202 R203 R204

R205 R206 330n R208 863-03048 R209 863-02481 R210 863-02477 6800n R211 R212 R213 863-02479 10Kn R214 R215 R216 863-02688 680Kn R302 R303 R305 863-02474 3300n R306 R307 R308 863-02586 R309 863-02475 4700n R310 863-02477 R311 R312 R313 863-03005

R315

R358 863-02586 3900n R359 863-02475 R360 R361 863-02468 R362 863-02474 R429 R479 863-02481 18Kn R480 R901 863-02471 2200n R905 863-02585 R906 R907 R908

R909 R910 R911

R951 863-02471 R955 863-02585 680n R956 863-02475 R957 R958 863-02483 27Kn R959 R960 R961 T101 T102 895-01068 AM T103 T104 AM T201 T202 895-01067 Y201 Y202 10.7 Y203 905-00145 10.7 0098 804-00730

PART

NO

863-02684

863-02501 100n 863-02489 120Kn

863-02587 15Kn 863-02492 150Kn

863-02469 863-02464 220n 863-02475

863-02471

863-02463 100n 863-02469

863-02475

863-02466 470n 863-02469 863-02466

•:I*I.M.1:M 863-02470 863-02465 390n

|:I*EiM.1:Ea

863-03005 863-02476

863-02471 863-02466

863-02481 863-02701

863-02476 863-02470

863-02468 820n 863-02474

863-02492 150Kn

863-02477 6800n

863-02481 863-02464 220n

863-02678 863-02483 863-02694

863-02463 100n

863-02678 863-02694

863-02485 47Kn 863-02469 1

820-01148 AM OSCILLATOR COIL 895-01048 895-01062

12Kn

820n

1

Kn ±5% 1/4W

4700n

Kn ±5% 1/4W 2200n 390n 4700n

8200n

1

Kn ±5% 1/4W 4700n 2200n 68Kn

1

Kn ±5% 1/4W 470n 680n 1800n

330n 22Kn ADJUSTABLE

18Kn

47Kn ROTARY 5600n

2200n 470n

18Kn

4.7Kn 5600n

1800n

3900n 6800n 3300n

47Kn ROTARY

4700n 820n

3300n 18Kn

680n 4700n 82n 27Kn 330Kn 47Kn

2200n 4700n

82n 330Kn

Kn ±5% 1/4W

AM FM

FM

10.7

TUNER PRINTED CIRCUIT BOARD

DESCRIPTION

±5% 1/4W ±5% 1/4W

±5% 1/4W

±5% 1/4W ±5% 1/4W

±5% 1/4W

±5% 1/4W ±5% 1/4W

±5% 1/4W

±5% 1/4W ±5% 1/4W ±5% 1/4W

±5% 1/4W ±5% 1/4W

±5% 1/4W

±5% 1 4W

±5% 1/4W ±5% 1/4W ±5% 1/4W

±5% 1/4W

±5% 1/4W ±5% 1/4W

±5% 1/4W

ROTARY DEMOD CONTROL

±5% 1/4W

±5% 1 4W

±5% 1/4W

±5% 1/4W ±5% 1/4W ±5% 1/4W

±5% 1/4W

±5% 1/4W ±5% 1/4W ±5% 1/4W

±5% 1/4W

±5% 1/4W ±5% 1/4W

IF

TRANSFORMER

IF

TRANSFORMER (WHITE)

IF

TRANSFORMER (BLACK)

IF

TRANSFORMER

IF

TRANSFORMER MHZ MHZ MHZ

CARBON FILM CARBON FILM

CARBON FILM

CARBON FILM CARBON FILM

CARBON FILM

CARBON FILM CARBON FILM

CARBON FILM

CARBON FILM CARBON FILM CARBON FILM

CARBON FILM

CARBON FILM CARBON FILM

CARBON FILM CARBON FILM CARBON FILM CARBON FILM

RES

CARBON FILM

FM

MUTE CONTROL

CARBON FILM

CARBON FILM CARBON FILM

CARBON FILM

CARBON FILM CARBON FILM

CARBON FILM

CARBON FILM CARBON FILM CARBON FILM

CARBON FILM

FM

SEPARATION CONT

CARBON FILM CARBON FILM CARBON FILM CARBON FILM

CARBON FILM

CARBON FILM CARBON FILM

CARBON FILM

CERAMIC FILTER CERAMIC FILTER CERAMIC FILTER

PREAMPLIFIER CIRCUIT BOARD COMPONENTS

390pF

C401 822-02937 C403

C404

C405

C406 C407 822-02600 C408 822-02600

822-02570 822-02501

±5% 50V

1uF

±20%

100pF

±5% 50V

4.7uF

25V

0.0022uF

0.033uF

±5% 50V ±5% 50V

CERAMIC

50V

ELECTROLYTIC

CERAMIC

ELECTROLYTIC

±5% 50V

MYLAR MYLAR MYLAR

CAP CAP

CAP CAP CAP

RES

RES RES

RES

RES RES RES RES

RES

RES RES

RES

RES RES

RES

RES RES

RES

RES RES

RES

RES RES RES

RES

RES RES RES RES

RES

RES RES RES

RES

RES RES

RES

29

AUDIO MODEL MC7041 (Cont.)

REF NO PART NO DESCRIPTION

4.7uF

C409 822-02855 C410 822-02568 47pF ±5% 50V CERAMIC CAP C411 822-02855 C412 822-02631 C413 822-02577 C414 C451 822-02937 390pF ±5% 50V CERAMIC CAP C453 C454 C455 822-02855 C456 C457 C458 C459 822-02855 C460 822-02568 47pF ±5% 50V CERAMIC CAP C461 822-02855 C462 C463

C464 Q401 Q402 Q451 Q452

R401

R402

R403

R404

R405

R406 863-02469 1KΩ

R407 363-02493 820KΩ

R408 863-02494 1MΩ

R409

R410 863-02465 390Ω

R411 863-03054 100KΩ ROTARY BALANCE CONTROL

R412

R413 863-02471 2200Ω R414 863-02480 12KΩ

R415 R416 863-02479 250KΩ DUAL ROTARY BAL CONTROL R417 863-03054 R418 863-02694 R419 863-02476 5600Ω R420 R421 863-02484 R422 R423 R424 R425 863-02592 R426 863-02474 R427 R430 863-02464 R451 863-02479 R452 863-02475 4700Ω R454 863-02487 R456 R457 R458 863-02494

R459 R460

R462

R463 863-02471 2200Ω R464 R465 R466 R468 863-02694 330KΩ R469 863-02476 5600Ω R470 863-02475 4700Ω R471 863-02484 R472 863-02491 220KΩ R473 863-02712 150Ω R474 863-02588 68KΩ R475 863-02592 470KΩ R476 863-02474 R477 R480 R507 863-02473 2700Ω R510 S002 S003 S004 885-00589 LOUDNESS LEVER SWITCH S005 885-00589 S006 885-00589 HI-FILTER LEVER SWITCH S007 S008

0091 804-00732 TONE CONTROL PRINTED CIRCUIT BD

POWER AMPLIFIER CIRCUIT BOARD COMPONENTS

CR1401 903-00364 CR1402 903-00384 CR1403 CR1404 903-00384 CR1451 903-00364 12 VOLT. 1 WATT ZENER DIODE CR1453 CR1454 903-00384 CR501 903-00429 RECTIFIER DIODE CR502 903-00429

822-02517 822-02610 1uF ±20% 50V ELECTROLYTIC

822-02570 100pF ±5% 50V CERAMIC CAP 822-02501

822-02600 822-02600

822-02631 822-02577 822-02517 921-01177 R. CHAN PREAMPLIFIER TSTR NPN 921-01103 R. CH TONE CONTROL AMP TSTR NPN 921-01177 L. CHAN PREAMPLIFIER TSTR NPN 921-01103 L. CH TONE CONTROL AMP TSTR NPN

863-02479

863-02475 863-03053 250KΩ DUAL ROTARY TREB CONTROL 863-02487

863-03111 100KΩ 2 SEC TAPPED VOL CONTROL

863-02473 2700Ω

863-02491 220KΩ

863-02480 12KΩ

863-02475 863-02491 220KΩ

863-02712 150Ω 863-02588

863-02592

863-02469 863-02493

863-02473 2700Ω 863-02465 863-02491

863-02480 12KΩ 863-02480 863-02479 10KΩ

863-02592 470KΩ 863-02464

863-02473 2700Ω 885-00589 FM AFC LEVER SWITCH 885-00589 FM MUTE LEVER SWITCH

885-00589 LO-FILTER LEVER SWITCH 885-00590 MONITOR (SOURCE-TAPE) LEVER SWI

903-00384

25V ELECTROLYTIC

4.7uF

25V ELECTROLYTIC

0.022uF

±5% 50V MYLAR CAP

0.012uF

±5% 50V MYLAR CAP

47uF 25V ELECTROLYTIC

4.7uF

25V ELECTROLYTIC

0.0022uF

0.033uF

4.7uF

0.022uF

0.012uF 47uF 25V ELECTROLYTIC

10KΩ 4700Ω

1200Ω

100KΩ DUAL ROTARY BASS CONTROL 330KΩ

4700Ω 33KΩ

68KΩ 470KΩ 3300Ω

470KΩ

220Ω 10KΩ

1200Ω 1KΩ

820KΩ

1MΩ

390Ω 220KΩ

12KΩ

33KΩ

3300Ω 220Ω

MODE (MONO-STEREO) LEVER SWITCH

12 VOLT. 1 WATT ZENER DIODE R. CHANNEL BIAS DIODE R . CHANNEL BIAS DIODE R.CHANNEL

L. CHANNEL BIAS DIODE L. CHANNEL BIAS DIODE

RECTIFIER DIODE

±5% 50V MYLAR CAP ±5% 50V MYLAR CAP ±5% 50V MYLAR CAP

25V ELECTROLYTIC 25V ELECTROLYTIC

±5% 50V MYLAR CAP ±5% 50V MYLAR CAP

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES ±5% 1 /4W CARBON FILM RES ±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES ±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

BIAS DIODE

REF NO

CR503 903-00379 RECTIFIER DIODE CR504 CR505 CR506 903-00379 RECTIFIER DIODE C019 822-02491 C1401 822-02524 C1402 822-02584 330pF ±5% 50V CERAMIC CAP C1403 822-02417 1uF 50V ELECTROLYTIC C1405 822-02573 C1406 822-02938 1 20pF ±5% 50V CERAMIC CAP C1407 822-02366 3pF ±0.25pF 50V CERAMIC CAP C1409 822-02686 C1410 822-02931 C1411 C1412 822-02580 C1414 822-02583 220pF ±5% 50V CERAMIC CAP C1415 822-02583 220pF ±5% 50V CERAMIC CAP C1451 822-02524 C1452 822-02584 330pF ±5% 50V CERAMIC CAP C1453 C1455 822-02573 C1456 C1457 C1459 822-02686 C1460 822-02931

C1461

C1462 822-02580 C1464 822-02583 220pF +5% 50V CERAMIC CAP C1465 822-02583 220pF +5% 50V CERAMIC CAP C501 822-02686 C502 822-02686 C503 822-02408 220uF 16V ELECTROLYTIC C504 822-02408 220uF 16V ELECTROLYTIC C505 822-02497 C506 822-02497 C507 822-02408 220uF 16V ELECTROLYTIC C508 822-02408 C509 822-02685 470uF 25V ELECTROLYTIC C510 822-02685 C511 822-02497 C512 822-02497 C513 822-02498 C514 822-02498 C515 822-02498 C516 822-02498 Q1401 921-01103 Q1402 Q1403 921-01102 R. CHANNEL BIAS TRANSISTOR PNP

Q1404 Q1405 921-01104 R. CH. 3RD AUDIO PREAMP TSTR PNP Q1406 921-01187 R. CH. 4TH AUDIO PREAMP TSOR NPN Q1407 Q1408 921-01102 R CH 2ND AUDIO PREDRIVER TSTR PNP Q1409 921-01187 Q1410 921-01104 R. CHAN AUDIO DRIVER TSTR PNP Q1411 921-01112 R. CHAN. POWER OUTPUT TSTR, NPN Q1412 Q1451 921-01103 Q1452 921-01102 L. CHANNEL BIAS TRANSISTOR PNP Q1453 921-01102 L. CHANNEL BIAS TRANSISTOR PNP Q1454 921-01103 L. CH. 2ND AUDIO PREAMP TSTR NPN Q1455 921-01104 L. CH. 3RD AUDIO PREAMP TSTR PNP Q1456 Q1457 Q1458 921-01102 L. CHAN. AUDIO PREDRIVER TSTR PNP Q1459 921-01187 L. CHAN. AUDIO DRIVER TSTR NPN

Q1460 Q1461 921-01112 L CH AUDIO POWER OUTPUT TSTR NPN Q1462 921-01113 Q501 Q502 921-01107 VOLTAGE REGULATOR TSTR PNP

R115 863-02488 100KΩ

R123

R1401 863-02593

R1402 863-02485

R1403 863-02469

R1404 863-02677

R1405

R1406 R1407 863-02471 R1408 863-02470 R1409 863-02485 R1410 863-02676 R1411 R1412 R1413 R1414 R1415 863-02680 R1416 863-02459 R1417 863-02459 R1418 R1419 R1420

R1421 863-02456 220Ω R1422 863-02690 R1423

PART NO DESCRIPTION

903-00379 RECTIFIER DIODE 903-00379 RECTIFIER DIODE

15pF.

±5% 50V CERAMIC CAP

0.47uF

50V ELECTROLYTIC

0.01uF

+100-0% 50V CERAMIC CAP

0.047uF

+80-20% 50V CERAMIC CAP

0.01uF

822-02931

822-02417

822-02938 120pF ±5% 50V CERAMIC CAP

822-02366 3pF ±0.25pF 50V CERAMIC CAP

822-02931

921-01102 R. CHANNEL BIAS TRANSISTOR PNP 921-01103

921-01063

921-01113

921-01187 L. CH. 4TH AUDIO PREAMP TSTR NPN 921-01063

921-1104 L. CHANNEL AUDIO DRIVER TSTR PNP

921-01106

863-02488

863-02479 863-02677

863-02469 863-02856 863-02459 863-02475

863-02456 863-02462 180Ω 863-02462 180Ω

863-02690

+100-0% 50V CERAMIC CAP

0.01uF

+100-0% 50V CERAMIC CAP

0.047uF

±5% 50V MYLAR CAP

0.47uF

50V ELECTROLYTIC

1uF 50V ELECTROLYTIC

0.01uF

+100-0% 50V CERAMIC CAP

0.047uF

+80-20% 50V CERAMIC CAP

0.01uF

+100-0% 50V CERAMIC CAP

0.01uF

+100-0% 50V CERAMIC CAP

0.047uF

±5% 50V MYLAR CAP

0.047uF

+80-20% 50V CERAMIC CAP

0.047uF

+80-20% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

220uF 16V ELECTROLYTIC

470uF 25V ELECTROLYTIC

0.022uF

+80-20% 50V CERAMIC CAP

0.022uF

+80-20% 50V CERAMIC CAP

0.01uF

±20% 500V CERAMIC CAP

0.01uF

±20% 500V CERAMIC CAP

0.01uF

±20% 500V CERAMIC CAP

0.01uF

±20% 500V CERAMIC CAP

R. CHAN 1ST AUDIO PREAMP TSTR NPN

R. CH. 2ND AUDIO PREAMP TSTR NPN

R CH 1ST AUDIO PREDRIVER TSTR NPN

R. CHAN. AUDIO DRIVER TSTR NPN

R. CHAN POWER OUTPUT TSTR PNP L. CH AUDIO PREAMPLIFIER TSTR NPN

L. CHAN.AUDIO PREDRIVER TSTR NPN

L CH AUDIO POWER OUTPUT TSTR PNP VOLTAGE REGULATOR TSTR NPN

±5%

100KΩ 560KΩ 47KΩ 1KΩ 200Ω 10KΩ 200Ω 2200Ω 1800Ω 47KΩ 68Ω 1KΩ 470Ω ROTARY R. CHAN. BIAS CONTROL 270Ω

4700Ω

1500Ω 270Ω

270Ω 220Ω

0.27Ω

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1 4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

2W METAL FILM RES

±5%

2W METAL FILM RES

30

AUDIO MODEL MC7041 (Cont.)

REF NO

R1424 R1425 863-02689 6.8Ω R1451 863-02593 560KΩ R1452 863-02485 47KΩ R1453 863-02469 1KΩ R1454 863-02677 200Ω R1455 863-02479 10KΩ R1456 863-02677 200Ω R1457 863-02471 2200Ω R1458 863-02470 1800Ω R1459 863-02485 47KΩ R1460 863-02676 68Ω R1461 863-02469 1KΩ

R1462 863-02856 470Ω ROTARY L. CHAN. BIAS CONTROL R1463 863-02459 270Ω R1464 863-02475 4700Ω R1465 863-02680 1500Ω R1466 863-02459 270Ω R1467 863-02459 270Ω R1468 863-02456 220Ω R1469 863-02462 180Ω R1470 863-02462 180Ω R1471 R1472 863-02690 R1473 R1474 R1475 863-02689 6.8Ω R207 863-02488 100KΩ

PART NO DESCRIPTION

863-02693 10Ω

863-02456 220Ω 863-02690

863-02693

±10%

1W METAL FILM RES

±5%

1W WIREWOUND RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1 4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 1 /2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES ±5% 1 /4W CARBON FILM RES ±5%

0.27Ω

0.27Ω 10Ω

1/2W CARBON FILM RES

±5%

2W METAL FILM-RES

±5%

2W METAL FILM RES

±10%

1W METAL FILM RES

±5%

1W WIREWOUND RES

±5%

1/4W CARBON FILM RES

PRODUCTION CHANGES

REF NO

R301 863-02488 R304 R428 863-02724 1 200Ω R501 R502 R503 R504 863-02475 4700Ω R509 R902 863-02488 100KΩ R903 863-02488 R904 863-02494 1MΩ R952 863-02488 100KΩ R953 863-02488 100KΩ R954 863-02494 1MΩ

0093 804-00731 AUDIO PRINTED CIRCUIT BOARD

FUNCTION SWITCH CIRCUIT BOARD COMPONENTS

0089 0090 NON STOCK

804-729 LED PRINTED CIRCUIT BOARD COMPONENTS

CR302 903-00385 CR509 CR510 903-00386 RED FUNCTION INDICATOR LED(AUX) CR511 903-00386 RED FUNCT'N INDICATOR LED(PHONO)) CR512 903-00386 RED FUNCTION INDICATOR LED(AM) R508 863-02470 1800Ω

PART NO DESCRIPTION

100KΩ

±5%

863-02488 863-02691

863-02475 863-02725

863-03050

804-00729

903-00386

100KΩ

27Ω 4700Ω 270Ω

22Ω

100KΩ

LED CIRCUIT BOARD ASSEMBLY

FUNCTION SWITCH P C BD (PART OF REF.

GREEN STEREO INDICATOR LED RED FUNCTION INDICATOR LED(TAPE)

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 1 /2W CARBON FILM RES

±10%

1W METAL FILM RES

±5%

1/4W CARBON FILM RES

±10%

1W METAL FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

NO. S1 885-627 SWITCH)

±5%

1 4W CARBON FILM RES

REF NO

Q501 R309 R359

EARLY PRODUCTION LATE PRODUCTION

PART NO

921-01106 VOLTAGE REGULATOR, NPN 863-02475

863-02475

DESCRIPTION

4700Ω

±5%

4700Ω

±5%

REF NO PART NO

Q501 1/4W CARBON FILM RES 1/4W CARBON FILM RES R359 863-02471

R309

921-01167 VOLTAGE REGULATOR, NPN 863-02471

DESCRIPTION

2200Ω 2200Ω ±5% 1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

31

AUDIO MODEL MC7051

REF NO PART NO

CABINET COMPONENTS

C501 822-02850 C502 C517 C701 C751 DSX501 900-00322 DSX502 DSX503 DSX504 900-00322 DSX505 900-00322 DS501 DS502 DS503 DS504 900-00322 PILOT LAMP. 300MA. DIAL SCALE DS505 FX501 FX502 F501 F502 J1401 844-00224

J1402 844-00221 J1403 844-00221 J501 878-00107 A C SOCKET

J502 878-00107 A C SOCKET J701 844-00225

K701

L001 895-01072

L101 820-01151 AM ANTENNA COIL

M101 922-00063

M102 922-00064

P501 Q1410 Q1411 Q1460 921-01112 Q1461 R512 863-02458 R516 R517 R901 R933 R951 R983 863-02704 S010 885-00613 S011 885-00584 AC POWER LEVER SWITCH TX501 T501 0001 814-01018 WOOD CABINET 0002 0003 0004 826-00212 0005 804-00606 0006 0007 992-00214 0008 0009 804-00702 0010 926-00371 POWER AMPLIFIER HEAT SINK 0011

0012 846-01094 ROTARY SW KNOB (SPKR'S A, B, A + B & 0013 0014 846-01065 LEVER SWITCH KNOB (8 REQ.)

0015 846-01044 0016 812-01219 TUNING SCALE LEFT MTG BRACKET 0017 0018 824-00549 0019 0020 861-00447 12X4.2MM DIAL CORD PULLEY 0021 841-00229 0022 0023 812-01220 0024 876-00556 0025 861-00423 16MM DIAL CORD PULLEY (2 REQ.) 0026 825-00082 PULLEY RETAINING PIN (4 REQ.) 0027 883-01042 0028 883-01045 LEVER SW MASKING STRIP (2 REQ.) 0029 0032 874-00052 VENTILATION SCREEN

0033 812-01221 0035 819-00248

0036 DIAL LAMP BRKT (MTS. DS501-504 ) 0038 812-01226 POWER TRANSFORMER MTG BRACKET 0039 812-01227

0042 886-00330 0043 886-00331 2 LUG TERMINAL STRIP 0044 812-01208 CAP MTG BRKT (MTS.C501 & C502) 0045 5 LUG TERMINAL STRIP 0046 812-01224 POWER AMP PCB LEFT MTG. BRACKET 0047 812-01308 POWER AMP PCB RIGHT MTG. BRKT 0048 966-00109 CABINET FOOT (4 REQ.) 0049 893-01068 CABINET RETAINING WASHER (4 REQ.)

822-02850 8200uF 50V ELECTROLYTIC CAPACITOR

822-02846 822-02497 822-02497

900-00322 900-00322

936-00069 6 AMP PIGTAIL FUSE 936-00069

936-00069 936-00069 6 AMP PIGTAIL FUSE

995-00055 SPEAKER PROTECTION RELAY

811-00218 AC LINE CORD 921-01112

921-01113

863-02866 863-02866 863-02488 863-02704 863-02488

895-01073

895-01073 POWER TRANSFORMER 804-00609

857-01678 CONTROL PANEL ESCUTCHEON

998-00055 804-00607

833-00216

846-01095

812-01218 TUNING SCALE RIGHT MTG BRACKET 857-01601 ZENITH NAME PLATE

812-01307

859-00304

8200uF 50V ELECTROLYTIC CAPACITOR

0.0047uF

0.022uF

0.022uF PILOT LAMP. 300MA PILOT LAMP. 300MA PILOT LAMP, 300MA PILOT LAMP. 300MA

PILOT LAMP. 300MA

PILOT LAMP. 300MA. DIAL SCALE PILOT LAMP.300MA.DIAL SCALE PILOT LAMP, 300MA. DIAL SCALE

PILOT LAMP. 300MA. DIAL SCALE 6 AMP PIGTAIL FUSE

6 AMP PIGTAIL FUSE

HEADPHONE JACK SPKR QUICK CONNECT (SPKR SYSTEM

'A' LEFT & RIGHT)

SPKR QUICK CONNECT (SPKR SYSTEM

'B'

MICROPHONE JACK

FM BALUN TRANSFORMER TUNING METER

FM TUNING METER

R. CHAN POWER AMP TSTR NPN R. CHANNEL POWER AMP TSTR PNP L. CHANNEL POWER AMP TSTR NPN L. CHANNEL POWER AMP TSTR PNP

2.2MΩ

0.22Ω

0.22Ω 100KΩ 150Ω 100KΩ 150Ω

ROTARY SPKR SELECT SW (A. B. A + B) POWER TRANSFORMER

CHASIS BOTTOM COVER DIAL SCALE

FRONT PANEL MTG BRACKET DIAL REFLECTOR DIAL SCALE LENS MAIN CIRCUIT BOARD MTG. FRAME BACK PANEL

SIDE MTG. FRAMES (2 REQ.)

FUNCTION (AM. FM. PHONO & AUX)

ROTARY KNOB ASSEMBLY(BASS,

TREBLE, VOLUME,& BALANCE 4 REQ.)

TUNING KNOB

TUNING SCALE COVER

BRACKET (MTS. REF. NO. 82. LED PCB

LED MTG BRKT (MTS CR51 2 & CR517) TUNING MTR BRKT (MTS. M101 & M102) TUNING ASSEMBLY SHAFT

LEVER SW MASKING STRIP (6 REQ.)

DIAL POINTER GUIDE CONTROL & SW BRKT (MTS. S1-S10

R905,

PLASTIC SUPPORT (4 REQ.)

POWER TRANSFORMER BRKT [MTS

T501 & REF. N0.38 812-1226 BRKT)

4 LUG TERMINAL STRIP

DESCRIPTION

+100-0% 150 AC CER. CAP +80-20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP

LEFT & RIGHT)

±5%

1/2W LINE ISOLATION RES

±10%

10W WIREWOUND RES

±10%

10W WIREWOUND RES

±5%

1/4W CARBON FILM RES

±10%

2W METAL FILM RES

±5%

1/4W CARBON FILM RES

±10%

2W METAL FILM RES

R907. R918 & R920.CONTROLS)

REF NO PART NO DESCRIPTION

0050 861-00433 0051 880-01133 DIAL CORD TENSION SPRING 0052A

0052B 897-00306 MAGNETIC PHONO GROUND STUD

0053 883-01067 0054 854-00345 0055 844-00222 JACK CLUSTER (INPUT PHONO 1 L & R)

0056 844-00223 JACK CLUSTER (3 REQ.) 0057 883-01114 ANTENNA TERMINAL STRIP 0058 817-00307 STRAIN RELIEF CLAMP(USED ON P501) 0060 841-00226 AM ANTENNA HOLDER 0062 812-01209 AM ANTENNA HOLDER BRACKET 0063 912-02188 3MM SCREW(MTS REF. NO. 60, & L101) 0064 854-00319 3MM NUT(USED WITH REF. NO. 63) 0055 817-00311 DE-EMPHASIS SWITCH BRKT CLAMP 0068 912-02190 SPEC'L SCREW (1 USED ON REF NO. 56

0069 912-02391 SPECIAL SCREW (4 MT REF. NO. 9) 0070 886-00329 CHASSIS GROUND LUG 0071 912-02179 3X20MM SCREW (8 REQ.) 0072 912-02185 0073 912-02192 0074 912-02191 3X8MM SCREW (2 RETAIN REF. NO. 3) 0075 912-02203 3X8MM SCREW (5 REQ.) 0076 912-02373 4X8MM SCREW (6 RETAIN REF. NO. 2) 0077 912-02374 4X16MM SCREW (4 REQ.) 0078 912-02181 3X6MM SCREW (12 REQ.) 0079 912-02375 4X1 2MM SCREW (4 REQ.) 0080 854-00349 0081 912-02159 3X8MM RND HD SCREW (4 REQ.) 0082 912-02157 3X8MM ROUND HEAD SCREW (60 REQ.) 0084 854-00348 3MM HEX NUT (USED WITH REF NO 81) 0085 912-02151 3X10MM RND HEAD SCREW (10 REQ.) 0087 912-02149 3X6MM SCREW (1 MTS. EA REF NO 202) 0088 893-01213 0096 878-00110 PWR TSTR INSULATING SOCKT (4 REQ) 0097 804-00734 DIAL LAMP PRINTED CIRCUIT BOARD 0101 878-00111 DIAL LAMP SOCKET (4 REQ.) 0102 883-01089 PWR TSTR MICA INSULATOR (4 REQ.) 0115 947-00133 TUNING METER SPACER 0116 883-01068 0117 912-02241 3X12MM SCREW (4 REQ.) 0118 893-01093 8MM LOCKWASHER 0200 859-00305 DIAL POINTER 0201 912-02376 3X10MM SCREW (4 REQ.) 0202 926-00357 VOLTAGE REG TSTR HEAT SINK (2 REQ.)

TUNER PRINTED CIRCUIT BOARD COMPONENTS

A001 975-00105 CR101 903-00350 SIGNAL METER DIODE CR201 903-00350 FM IF DIODE CR202 903-00384 FM TUNING METER DIODE CR301 903-00350 FM MULTIPLEX SWITCH DIODE C101 822-02606 C102 822-02506 C103 822-02506 C104 C105 822-02586 330pF ±5% 50V POLYSTYRENE CAP

C106 822-02606 1000pF ±10% 50V CERAMIC CAP C107 822-02616 C108 822-02616

C109 822-02506 0.01 uF ±5% 50V MYLAR CAP C110 C111 822-02506 C112 822-02417 1uF 50V ELECTROLYTIC C113 822-02497 C114 822-02506 C115 822-02398 C116 822-02588 100uF 6.3V ELECTROLYTIC C117 822-02408 220uF 16V ELECTROLYTIC C118 822-02848 1 5pF ±5% 50V CERAMIC CAP C201 822-02497 C202 822-02497 C203 822-02497 C204 822-02491 15pF ±5% 50V CERAMIC CAP

C205 822-02497 C206 822-02497 C207 822-02497 C208 822-02405 10uF 16V ELECTROLYTIC C209 822-02377 330pF ±10% 50V CERAMIC CAP C210 822-02497 C211 822-02497 C212 822-02497 C213 822-02404 C214 822-02497 C215 822-02497 C216 822-02417 1uF 50V ELECTROLYTIC C217 822-02410 1000uF 16V ELECTROLYTIC C301 822-02497 C302 822-02407 100uF 16V ELECTROLYTIC C303 822-02405 10uF 16V ELECTROLYTIC C304 822-02513 470pF ±5% 50V POLYSTYRENE CAP C305 822-02580 C306 822-02529 10uF 25V ELECTROLYTIC

886-00363 SCREW TERM W/BINDING POST (PART

822-02603

822-02506

TUNING CAPACITOR PULLEY (BLACK)

OF REF NO 0052B)

TUNING SHAFT RETAINING STRIP

RETAINS REF. NO. 24)

6.35MM

NUT (RETAINS REF NO 118 &

REF NO 52B)

2.6X4MM

2.6X10MM

2.6MM

3.5MM

RETAINING STRIP

FM TUNER

1000pF ±10% 50V CERAMIC CAP

0.01uF

0.047uF

3.3uF

0.01uF

0.022uF

0.01uF

0.22uF

0.022uF

4.7uF

0.022uF

0.047uF

SCREW (2 MT REF. NO. S-9)

SCREW (4 MT J501 & J502)

NUT (2 MTS. EA. J501 & J502)

WASHER (2 REQ.)

±5% 50V MYLAR CAP ±5% 50V MYLAR CAP

+80-20% 50V CERAMIC CAP

50V ELECTROLYTIC 50V ELECTROLYTIC

±5% 50V MYLAR CAP ±5% 50V MYLAR CAP

+80-20% 50V CERAMIC CAP ±5% 50V MYLAR CAP ±10% 25V ELECTROLYTIC

+80-20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP

+80-20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP

16V ELECTROLYTIC

+80-20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP

+80-20% 50V CERAMIC CAP

±5% 50V MYLAR CAP

32

AUDIO MODEL MC7051 (Cont.)

REF NO

C307 C308 822-02595 C309 C310 822-02599 C311 C312 822-02596 IC101 905-00155 IC201 IC301 LF301 LF302 905-00157 L102 820-01149 L201 820-01127 L202 820-01129

L203 Q201 Q301 Q302 Q303 921-01109 Q304

R101 863-02584 R102 R103 R104 863-02712 R105 R106 R107 863-02472 R108 R109 R110 R111 863-02711 R201 R202 863-02474 R203 863-02467 R204 863-02465 R205 863-02584 R206 863-03034 R207 863-03034 R208 863-02593 R209 863-02584 R210 R211 863-02476 R212 R213 R214 863-02488 R215 R216 R217 R218 863-02707 R301 R302 863-03039 R303 R304 R305 R306 863-03037

R307 R308 R309 863-02587 15KΩ R310 863-02488 R311 863-02498 R312 R313 863-02475 R316 863-02472 R317 863-02472 R318 863-03006 R319 863-02474 R320 863-02474 R321 R322 R323 863-02686

R324 863-02785 T101 T102 895-01068 T201 895-01067 T301 895-01070 T302 895-01071 Y201 Y202 905-00158 Y203 0092

PHONO EQUALIZER CIRCUIT BOARD COMPONENTS

C702 C703 C704 C705 C706 C707 C708 822-02604 C709 C710 C711 C712 C713 822-03160 C714 C715 822-02602 8200pF ±5% 50V POLYSTYRENE CAP

PART NO

822-02530 822-02599 822-02596

905-00143 905-00135

905-00157

820-01127 921-01060 921-01111 921-01063

921-01109

863-02479 863-02480

863-02473 863-02700

863-03036 863-02469 863-02483 27KΩ

863-02715

863-02471 863-02479

863-03035 560Ω 863-03006

863-03006 100KΩ FM MUTE ADJUST CONTROL 863-02480 12KΩ

863-03038 863-03036

863-02865 863-02501 100Ω

863-02476 863-02701

863-02475 4700Ω

863-02475 4700Ω 863-02475 4700Ω

895-01069 AM IF TRANSFORMER

905-00158 10.7 MHZ CERAMIC FILTER 905-00158 10.7 MHZ CERAMIC FILTER

804-00615 TUNER PRINTED CIRCUIT BOARD

822-02529 822-02499 220pF ±10% 50V CERAMIC CAP 822-02620 822-03160 822-02601 2700pF ±5% 50V POLYSTYRENE CAP 822-02602

822-02610 822-02529 1mF 25V ELECTROLYTIC 822-02499 822-02620 33/xF 25V ELECTROLYTIC

822-02601

0.33uF

0.22uF 5600pF ±5% 50V MYLAR CAP 5600pF ±5% 50V MYLAR CAP

4.7uF

4.7uF AM IF-DETECTOR INTEGRATED CIRCUIT

FM IF INTEGRATED CIRCUIT

FM MULTIPLEX DECODER IC R. CHANNEL FM LOW PASS FILTER L. CHANNEL FM LOW PASS FILTER AM OSCILLATOR COIL

2.2UH

18 UH CHOKE

2.2UH

FM 1 ST IF TRANSISTOR N PN

FM BUFFER TRANSISTOR NPN

FM STEREO LAMP DRIVER TSTR ,NPN

R. CHAN FM AUDIO PREAMP TSTR PNF

L. CHAN FM AUDIO PREAMP TSTR PNP 330Ω

10KΩ

12KΩ

150Ω 2700Ω

10KΩ ADJUSTABLE RES

1500Ω 680Ω

1KΩ

47Ω

1.8MΩ 3300Ω 560Ω 390Ω

330Ω

56Ω 56Ω

560KΩ 330Ω 2200Ω 5600Ω

10KΩ 100KΩ

100KΩ FM TUNING MTR ADJ CONTROL

22Ω 39KΩ

120KΩ

680Ω 2200Ω

3900Ω 5600Ω

4700Ω DEMODULATOR ADJ CONTROL

100KΩ

3300Ω 4700Ω

1500Ω 1500Ω

100KΩ STEREO SEPARATION ADJUST 3300Ω 3300Ω

100KΩ 470Ω

AM IF TRANSFORMER

FM IF TRANSFORMER FM MULTIPLEX OSC TRANSFORMER

FM MULTIPLEX OSC TRANSFORMER

10.7 MHZ CERAMIC FILTER

1MF 25V ELECTROLYTIC

33/xF 25V ELECTROLYTIC 33jotF ±20% 25V ELECTROLYTIC

8200pF ±5% 50V POLYSTYRENE CAP 33pF ±10% 50V CERAMIC CAP

1/xF ±20% 50V ELECTROLYTIC

220pF ±10% 50V CERAMIC CAP 33/xF ±20% 25V ELECTROLYTIC

2700pF ±5% 50V POLYSTYRENE CAP

DESCRIPTION

25V ELECTROLYTIC

-10% 10V ELECTROLYTIC

± 10% 25V TANT CAP

±10% 25V TANT CAP

CHOKE CHOKE

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 1 /4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 1 /4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

REF NO

C716 822-02604 C717 822-02610 C718 822-02617 C752 822-02529 C753 C754 C755 822-03160 C756 C757 822-02602 C758 822-02604

C759 822-02610 C760 C761 822-02499 C762 822-02620 33uF 25V ELECTROLYTIC C763 822-03160 C764 C765 822-02602 C766 822-02604 33pF ±10% 50V CERAMIC CAP C767 822-02610 C768 822-02617 C769 C770 822-02530 C771 822-02585 3300pF ±5% 50V MYLAR CAP C772 822-02604 C773 822-02401 33uF 10V ELECTROLYTIC C774 822-02624 C775 822-02617 Q701 Q702 921-01176 Q703 921-01177 R. CHAN 3RD EQUALIZER TSTR NPN Q704 921-01176 R.CH (PHONO-2) 1st EQUAL'R TSTR PNP Q705 921-01176 R. CHAN 2ND EQUALIZER TSTR PNP Q706 921-01177 R. CHAN 3RD EQUALIZER TSTR NPN Q751 921-01176 L.CH (PHONO-1) 1 st EQUAL'R TSTR PNP Q752 921-01176 Q753 921-01177 L. CHAN 3RD EQUALIZER TSTR NPN

Q754 921-01176 L.CH (PHONO-2) 1st EQUAL'R TSTR PNP

Q755 921-01176

Q756 921-01177 Q757 921-01177 1st MICROPHONE EQUALIZ'R TSTR NPN Q758 921-01177 2nd MICROPHONE EQUAL'R TSTR NPN

R701 863-02463 100Ω R702 R703 863-02486 56KΩ R704 863-02488 100KΩ

R705 R706 863-02486 56KΩ ±5% 1/4W CARBON FILM RES R707 863-02585 680Ω R708 R709 863-02593 560KΩ R710 863-02476 5600Ω R711 863-02471 2200Ω R712 863-02489 120KΩ R713 863-02463 100Ω R714 863-02488 100KΩ R715 863-02486 56KΩ R716 863-02488 100KΩ R717 863-02588 68KΩ R718 R719 863-02585 680Ω R720 R721 863-02593 560KΩ R722 863-02476 5600Ω R723 863-02471 2200Ω R724 863-02489 120KΩ R725 863-03034 56Ω R751 863-02463 100Ω R752 863-02488 100KΩ R753 863-02486 56KΩ R754 863-02488 100KΩ R755 863-02588 68KΩ R756 863-02486 56KΩ R757 863-02585 680Ω R758 R759 863-02593 560KΩ R760 863-02476 5600Ω R761 863-02471 2200Ω R762 863-02489 120KΩ R763 R764 863-02488 100KΩ R765 863-02486 56KΩ R766 863-02488 100KΩ R767 863-02588 68KΩ R768 863-02486 56KΩ R769 863-02585 680Ω R770 863-02483 27KΩ R771 863-02593 560KΩ R772 863-02476 5600Ω R773 863-02471 2200Ω R774 863-02489 120KΩ R775 863-03034 56Ω R776 863-03034 56Ω R777 863-02463 100Ω R778 863-02485 47KΩ R779 863-02590 270KΩ R780 863-02489 120KΩ

PART NO

33pF ±10% 50V CERAMIC CAP

1uF ±20% 50V ELECTROLYTIC 100uF 35V ELECTROLYTIC

822-02499 822-02620 33uF 25V ELECTROLYTIC

822-02601

822-02529

822-02601 2700pF ±5% 50V POLYSTYRENE CAP

822-02523 220uF 35V ELECTROLYTIC

921-01176

863-02488

863-02588

863-02483

863-02486 56KΩ

863-02483 27KΩ

863-02463 100Ω

1uF 25V ELECTROLYTIC 220pF ±10% 50V CERAMIC CAP

33uF ±20% 25V ELECTROLYTIC

2700pF ±5% 50V POLYSTYRENE CAP 8200pF ±5% 50V POLYSTYRENE CAP 33pF ±10% 50V CERAMIC CAP

1uF ±20% 50V ELECTROLYTIC

1uF 25V ELECTROLYTIC 220pF ±10% 50V CERAMIC CAP

33uF ±20% 25V ELECTROLYTIC 8200pF ±5% 50V POLYSTYRENE CAP

1uF ±20% 50V ELECTROLYTIC

100uF 35V ELECTROLYTIC

0.33uF 33pF ±10% 50V CERAMIC CAP

2.2uF

100uF 35V ELECTROLYTIC

R.CH (PHONO-1) 1st EQUAL'R TSTR PNP

R.CHAN

L.CHANNEL

100KΩ

68KΩ

27KΩ

DESCRIPTION

25V ELECTROLYTIC

±20% 50V ELECTROLYTIC

2ND EQUALIZER TSTR PNP

2ND EQUALIZER TSTR PNP 3RD EQUALIZER TSTR NPN

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

14 W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

33

AUDIO MODEL MC7051 (Cont.)

REF NO PART NO

R781 R782 863-02588 68KΩ R783 R784 R785 863-02473 R786 863-02485 R787

PRE-AMPLIFIER CIRCUIT BOARD COMPONENTS

C901 C902 822-02935 C903 822-02624 C904 822-02377 330pF ±10% 50V CERAMIC CAP C905 822-02405 C906 822-02621 C907 822-02622 C908 822-02600 C909 822-02600 C910 822-02500 C911 822-02622 C912 822-02622 C913 822-02623 C914 822-02597 C915 822-02577 C916 822-02600 C919 822-02823 C920 822-02604 C951 822-03146 C952 C953 822-02624 C954 822-02377 C955 822-02405 C956 822-02621 C957 822-02622 C958 822-02600 C959 822-02600 C960 C961 822-02622 C962 822-02622 C963 C964 822-02597 C965 822-02577 C966 C967 822-02617 C968 822-02523 220uF 35V ELECTROLYTIC C969 C970 822-02604 Q901 921-01177 R.CH TONE CONTROL AMP TSTR NPN Q902 921-01176 Q903 921-01177 Q951 921-01177 L.CH TONE CONTROL AMP TSTR NPN Q952 Q953 921-01177 R902 863-02469 R903 863-02474 R904 863-02474 R905 R906 863-02475 R907 863-03321 R908 R909 863-02492 R910 863-02488 R911 863-02481 R912 863-02481 R913 863-02472 R914 863-02479 R915 863-02469 R917 863-02476 R918 863-03027 R919 863-02483 R920 863-03027 R922 863-02476 R923 R924 863-02489 R925 R926 863-02471 R927 863-02486 R929 863-02592 R930 863-02485 R934 R952 863-02469 R956 R958 863-02469 R959 863-02492 R960 863-02488 R961 R962 863-02481 R963 863-02472 R964 R965

R967

R969 R972 R973 863-02592 R974 863-02489 R975

863-02469 863-02589 390KΩ

863-02481 18KΩ

863-02463 100Ω

822-03146

822-02935

822-02500

822-02623

822-02600

822-02823 100pF ±10% 50V CERAMIC CAP

921-01176

863-03029

863-02469 1KΩ

863-02592 863-02713

863-02481 863-02475

863-02481

863-02479 863-02469 863-02476 863-02483 863-02476

863-02713

1KΩ

2700Ω. 47KΩ

470pF ±10% 50V CERAMIC CAP

0.12uF

2.2uF 10uF 16V ELECTROLYTIC

33uF ±20% 35V ELECTROLYTIC

4.7uF

0.033uF

0.001uF

4.7uF

4.7uF 100uF ±20% 10V ELECTROLYTIC

2.2uF

0.012uF

0.033uF 100pF ±10% 50V CERAMIC CAP

33pF ±10% 50V CERAMIC CAP 470pF ±10% 50V CERAMIC CAP

0.12uF

2.2uF

330pF ±10% 50V CERAMIC CAP

10uF 16V ELECTROLYTIC

33uF ±20% 35V ELECTROLYTIC

4.7uF

0.033uF

0.001uF

4.7uF

4.7uF 100uF ±20% 10V ELECTROLYTIC

2.2uF

0.012uF

0.033uF 100uF 35V ELECTROLYTIC

33pF ±10% 50V CERAMIC CAP

R. CHANNEL 1ST PREAMP TSTR NPN R.CHANNEL

L.CHANNEL L.CHANNEL 1KΩ

3300Ω 3300Ω 250KΩ DUAL ROTARY BAL CONTROL 4700Ω

100KΩ(50KΩ) DUAL TAPPED VOL CONT 150KΩ

100KΩ 18KΩ 18KΩ 1500Ω

10KΩ 1KΩ 5600Ω 100KΩ DUAL ROTARY BASS CONTROL 27KΩ 100KΩ DUAL ROTARY TREB CONTROL 5600Ω 470KΩ 120KΩ 6800Ω 2200Ω 56KΩ

470KΩ

47KΩ 18KΩ 1KΩ

4700Ω

1KΩ 150KΩ 100KΩ 18KΩ 18KΩ 1500Ω 10KΩ 1KΩ 5600Ω

27KΩ 5600Ω 470KΩ

120KΩ 6800Ω

DESCRIPTION

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±10%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 50V MYLAR CAP

±20% 50V ELECTROLYTIC

±20% 35V ELECTROLYTIC

±5% 50V MYLAR CAP ±5% 50V MYLAR CAP

±5% 50V MYLAR CAP ±20% 35V ELECTROLYTIC ±20% 35V ELECTROLYTIC

±10% 25V TANT CAP

±5% 50V MYLAR CAP

±20% 50V ELECTROLYTIC

±20% 35V ELECTROLYTIC

±5% 50V MYLAR CAP

±20% 35V ELECTROLYTIC ±20% 35V ELECTROLYTIC

±10% 25V TANT CAP

±5% 50V MYLAR CAP

2ND PREAMP TSTR NPN

1ST PREAMP TSTR NPN 2ND PREAMP TSTR NPN

±5% 1 /4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 1 /4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5% 1 /4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

REF NO

R976 863-02471 2200Ω R977 863-02486 56KΩ R979 863-02592 470KΩ R980 863-02485 47KΩ R981 863-02584 330Ω R982 863-02464 220Ω R984

S001 885-00612 ROTARY FUNCTION SWITCH) S002 S003 885-00585 TAPE MONITOR LEVER SWITCH S004 S005 385-00583 LOUDNESS (ON-OFF) LEVER SWITCH S006 885-00583 FM MUTE (ON-OFF) LEVER SWITCH S007 S008 885-00583 LO-FILTER (ON-OFF) LEVER SWITCH 0098 NON STOCK PRE-AMPLIFIER CIRCUIT BOARD

POWER AMPLIFIER CIRCUIT BOARD COMPONENTS

CR1401 CR1402 903-00464 R. CHAN TEMP COMPENSATING DIODE CR1403 903-00384 R. CHANNEL BIAS DIODE CR1451 CR1452 903-00464 CR1453 C1401 822-02530 C1402 822-02377 330pF ±10% 50V CERAMIC CAP C1403 822-02407 100uF 16V ELECTROLYTIC C1404 822-02847 68pF ±10% 50V CERAMIC CAP C1405 822-02847 68pF ±10% 50V CERAMIC CAP C1406 822-02509 0.1uF ±5% 50V MYLAR CAP

C1407 822-02849 47uF 50V ELECTROLYTIC C1408 822-02371 47pF ±10% 50V CERAMIC CAP C1409 822-02371 47pF ±10% 50V CERAMIC CAP C1410 822-02849 47uF 50V ELECTROLYTIC C1411 822-02509 0.1uF ±5% 50V MYLAR CAP C1451 822-02530 C1452 822-02377 330pF ±10% 50V CERAMIC CAP C1453 822-02407 100uF 16V ELECTROLYTIC C1454 822-02847 68pF ±10% 50V CERAMIC CAP C1455 822-02847 68pF ±10% 50V CERAMIC CAP C1456 822-02509 0.1uF ±5% 50V MYLAR CAP C1457 822-02849 47uF 50V ELECTROLYTIC C1458 822-02371 47pF ±10% 50V CERAMIC CAP C1459 822-02371 47pF ±10% 50V CERAMIC CAP C1460 822-02849 C1461 822-02509 0.1uF ±5% 50V MYLAR CAP

L1401

L1451 820-01150 CHOKE COLL Q1401 921-01102 R. CHANNEL BIAS TRANSISTOR PNP Q1402 921-01102 R. CHANNEL BIAS TRANSISTOR PNP Q1403 921-01103 R. CH 1ST AUDIO AMP TSTR NPN Q1404 921-01103 R. CHAN 2ND AUDIO AMP TSTR NPN Q1405 921-01178 R. CHANNEL PREDRIVER TSTR PNP Q1406 921-01105 R. CHANNEL BIAS TRANSISTOR NPN Q1407 921-01179 R. CHANNEL BIAS TRANSISTOR NPN Q1408 921-01114 R. CHANNEL DRIVER TRANSISTOR NPN Q1409 921-01115 R. CHANNEL DRIVER TRANSISTOR PNP Q1451 921-01102 L. CHANNEL BIAS TRANSISTOR PNP Q1452 921-01102 L CHANNEL 1 ST AUDIO AMP TSTR NPN Q1454 921-01103 L. CHANNEL 2ND AUDIO AMP TSTR NPN Q1455 921-01178 L. CHANNEL PREDRIVER TSTR PNP Q1456 921-01105 L. CHANNEL BIAS TRANSISTOR NPN Q1457 921-01179 L. CHANNEL BIAS TRANSISTOR NPN Q1458 Q1459 921-01115 L. CHANNEL DRIVER TRANSISTOR PNP R1401 863-02593 560KΩ R1402 R1403 863-02469 1KΩ R1404 863-02485 47KΩ R1405 863-02464 220Ω R1406 863-02464 220Ω R1407 863-02483 27KΩ R1408 863-02471 2200Ω R1409 863-02485 47KΩ R1410 863-02714 39KΩ R1411 R1412 863-02471 2200Ω R1413 863-02581 R1414 863-02581 68Ω R1415 R1416 863-03032 220Ω R1417 863-03032 220Ω R1418 R1419 863-03032 220Ω R1420 863-02703 R1421 863-02703 R1422 863-03033 10Ω R1423 863-02705 10Ω R1451 863-02593 560KΩ R1452 R1453 863-02469 1KΩ R1454 863-02485 47KΩ R1455 863-02464 220Ω R1456 863-02464 220Ω R1457

R1458 863-02471 2200Ω

PART NO

863-02481 885-00585 885-00583 MODE (STEREO-MONO) LEVER SWITCH

885-00583

903-00384 R. CHANNEL BIAS DIODE

903-00384 L. CHANNEL BIAS DIODE 903-00384 L. CHANNEL BIAS DIODE

820-01150

921-01114

863-02469 1KΩ

863-02701 4700Ω R. CHANNEL BIAS ADJUST CONT

863-02581

863-03032 220Ω

863-02469

863-02483

18KΩ

TAPE DUBBI8NG LEVER SWITCH

HI-FILTER (ON-OFF) LEVER SWITCH

L. CHAN TEMP COMPENSATING DIODE

0.33uF

47uF 50V ELECTROLYTIC CHOKE COIL.2.2uH 10%

L. CHANNEL DRIVER TRANSISTOR NPN

68Ω 68Ω

0.47Ω

1KΩ

27KΩ

DESCRIPTION

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

25V ELECTROLYTIC

2.2uH

10%

±5%

1/4W CARBON FILM RES ±5% 1 /4W CARBON FILM RES ±5% 1 /4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±10%

1W METAL FILM RES

±10%

1W METAL FILM RES

±10%

1W METAL FILM RES

±10%

1W METAL FILM RES

±10%

3W WIREWOUND RES

±10%

3W WIREWOUND RES

±10%

1W METAL FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

34

AUDIO MODEL MC7051 (Cont.)

REF NO PART NO

R1459 R1460 863-02714 39KΩ R1461 R1462 R1463 863-02581 68Ω R1464 R1465 863-02581 R1466 863-03032 220Ω R1467 R1468 R1469 863-03032 R1470 863-02703

R1471 R1472 863-03033 R1473 863-02705 0095

POWER SUPPLY CIRCUIT BOARD COMPONENTS

CRX501 CRX502 CRX503 903-00381 RECTIFIER DIODE CRX504 CRX505 903-00382 CRX506 903-00382 CRX509 903-00347 RECTIFIER DIODE

CRX510 903-00347 CR501 CR502 CR503 CR504 CR505 CR506 903-00382 CR507 903-00383 CR508 903-00364 CR509 CR510 903-00347 C503 C504 C505 C506 C507 822-02498 C508 C509 C510 822-02614 C511 C512 C513 822-02619 C514 822-02616 C515 C516 FX502S FX503 FX504 936-00071 FX505 F503 F504 F505 Q501 Q502 Q503 R501 863-02469 R502 R503 R504 R505 863-02706 R506 R507 R508 863-02479 R509 R510 R511 863-02479

0094 NON STOCK

863-02485 863-02701 4700Ω ROTARY L. CHAN BIAS CONTROL

863-02471 863-02581

863-03032 863-03032

863-02703

NON STOCK

903-00381 RECTIFIER DIODE 903-00381 RECTIFIER DIODE

903-00381 RECTIFIER DIODE

903-00381 903-00381 903-00381 903-00381 903-00382

903-00347

822-02498

822-02498 822-02498

822-02408 822-02613

822-02613

822-02616 822-02409 470uF 16V ELECTROLYTIC

936-00069 6 AMP PIGTAIL FUSE

936-00071 936-00068

936-00071 936-00071 936-00068 PIGTAIL FUSE, 2A 921-01065 921-01065 921-01063

863-02710 863-02713 863-03031

863-02713 6800Ω 863-02469

863-02700 863-02586

47KΩ

2200Ω 68Ω

68Ω 220Ω

220Ω 220Ω

0.47Ω

0.47Ω 10Ω 10Ω

RECTIFIER DIODE RECTIFIER DIODE

RECTIFIER DIODE

RECTIFIER RECTIFIER RECTIFIER RECTIFIER RECTIFIER RECTIFIER 14 VOLT, 1 WATT ZENER DIODE 12 VOLT, 1 WATT ZENER DIODE RECTIFIER DIODE RECTIFIER DIODE

0.01uF

220uF 16V ELECTROLYTIC 330uF 50V ELECTROLYTIC 470uF 50V ELECTROLYTIC 470uF 50V ELECTROLYTIC 220uF 50V ELECTROLYTIC

3.3uF

0.5 AMP SLO-BLO PIGTAIL FUSE

0.5 AMP SLO-BLO PIGTAIL FUSE 2 AMP PIGTAIL FUSE

PIGTAIL FUSE, 0.5A SB PIGTAIL FUSE, 0.5A SB

VOLTAGE REGULATOR TSTR NPN VOLTAGE REGULATOR TSTR NPN VOLTAGE REGULATOR TSTR NPN

1KΩ 10Ω

6800Ω

180Ω 15Ω

1KΩ

10KΩ 10KΩ ROTARY VOLT'GE REG CONTROL

3900Ω

10KΩ

POWER SUPPLY PRINTED CIRCUIT BD

DESCRIPTION

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±10%

1W METAL FILM RES

±10%

1W METAL FILM RES

±10%

1W METAL FILM RES

±10%

1W METAL FILM RES

±10%

3W WIREWOUND RES

±10%

3W WIREWOUND RES

±10%

1W METAL FILM RES

±5%

1/2W CARBON FILM RES

POWER AMPLIFIER P C BD

±20% 500V CERAMIC CAP ±20% 500V CERAMIC CAP ±20% 500V CERAMIC CAP ±20% 500V CERAMIC CAP ±20% 500V CERAMIC CAP

±20% 500V CERAMIC CAP

50V ELECTROLYTIC 50V ELECTROLYTIC

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±10%

5W WIREWOUND RES

±5% 1 /2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

REF NO PART NO

SPEAKER PROTECTION RELAY P C BD COMPONENTS

CR701 CR702 903-00384 RECTIFIER DIODE CR703 903-00384 RECTIFIER DIODE CR704 903-00384 RECTIFIER DIODE CR705 903-00384 RECTIFIER DIODE CR706 903-00384 RECTIFIER DIODE CR707 903-00347 RECTIFIER DIODE C723 822-02595 C724 822-02595 C725 822-02608 470uF 6.3V ELECTROLYTIC C726 822-02608 470uF 6.3V ELECTROLYTIC C727 822-02406 47uF 16V ELECTROLYTIC Q707 921-01063 RELAY L. CHANNEL INPUT TSTR NPN

Q709 921-01063 + DC VOLTAGE DETECTOR TSTR NPN Q710 921-01063 - DC VOLTAGE DETECTOR TSTR NPN Q711 921-01139 DC SWITCH TRANSISTOR NPN Q712 921-01082 DC DRIVER TRANSISTOR NPN Q713 921-01105 RELAY COIL DRIVER TRANSISTOR NPN R731 863-02473 2700Ω R732 863-02473 2700Ω R733 863-02473 2700Ω R734 863-02473 2700Ω R735 863-02587 15KΩ R736 863-02587 15KΩ R737 863-02587 15KΩ R738 863-02587 15KΩ R739 863-02478 8200Ω R740 863-02482 22KΩ R741 863-02474 3300Ω R742 863-02492 150KΩ R743 863-02587 15KΩ R744 863-02588 68KΩ R745 863-02587 15KΩ R746 863-02479 10KΩ R747 R748 863-02591 82KΩ R749 863-02582 22Ω R750 863-02709 270Ω R916 863-02587 15KΩ R921 863-02587 15KΩ R928 863-02474 3300Ω R953 863-02474 3300Ω R954 863-02474 3300Ω R966 863-02587 15KΩ R971 863-02587 15KΩ R978 863-02474 3300Ω

0093 804-00621 RELAY PRINTED CIRCUIT BOARD

804-622 LED PRINTED CIRCUIT BOARD ASSEMBLY

CR511 CR512 903-00386 RED FUNCTION INDICATOR LED (AUX) CR513 903-00386 RED FUNCT'N INDICATOR LED (PHONO) CR514 CR515 903-00386 RED FUNCTION INDICATOR LED (FM) CR516 903-00386 RED FUNCTION INDICATOR LED (AM) CR517 903-00385 GREEN STEREO INDICATOR LED R513 863-02584 330Ω R514 863-02585 680Ω R515 863-02584 330Ω 0099 NON STOCK LED PRINTED CIRCUIT BOARD

804-736 DE-EMPHASIS CIRCUIT BOARD ASSEMBLY

C313 822-02506 C314 822-02506 0.01u ±5% 50V MYLAR CAP S009 885-00578 DE-EMPHASIS (25US-75US) SLIDE SWI

0100 NON STOCK DE-EMPHASIS PRINTED CIRCUIT BD

PARTS NOT REFERENCED ON EXPLODED VIEW

903-00384

921-01063 RELAY R. CHANNEL INPUT TRANSISTOR NPN

863-02479

903-00386 RED LED FUNCTION INDICATOR (MIC)

903-00386

20204405 INSTRUCTION BOOK

RECTIFIER DIODE

0.22uF

10KΩ

COMPONENTS

RED FUNCTION INDICATOR LED (TAPE)

0.01u

DESCRIPTION

-10% 10V ELECTROLYTIC

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/2W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

1/4W CARBON FILM RES

±5%

50V MYLAR CAP

35

REF NO.

C002 822-2837 C003 822-2835 3pF 5% 50V CERAMIC CAP C004 C005 822-2844 C006 822-2839 12pF 5% 50V CERAMIC CAP C007 C008 822-2834 1pF 5% 50V CERAMIC CAP C009 822-2836 18pF 5% 50V CERAMIC CAP

C011 822-2844 C012 822-2844 C013 822-2844

C014 822-2841 47pF 10% 50V CERAMIC CAP

C015 C016 822-2843 6pF 5% 50V CERAMIC CAP C017 822-2842 C018 822-2840 C021 822-2838 10pF 5% 50V CERAMIC CAP C022 822-2844

L001 820-1176 TRAP COIL L002 820-1177 ANTENNA COIL

PART NO. DESCRIPTION

FM TUNER COMPONENTS

100pF 5% 50V CERAMIC CAP

822-2844

822-2839

822-2840

0.022MFD

0.022MFD 12pF 5% 50V CERAMIC CAP

0.022MFD

0.022MFD 15pF 5% 50V CERAMIC CAP

15pF5% 50V CERAMIC CAP 15pF5% 50V CERAMIC CAP

0.022MFD

+80-20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP

+80—20% 50V CERAMIC CAP +80-20% 50V CERAMIC CAP + 80-20% 50V CERAMIC CAP

+80-20% 50V CERAMIC CAP

975-105 TUNER

REF

NO.

L003 895-1096 RF COIL PRIMARY L004 895-1097 RF COIL SECONDARY L006 820-1178 COIL L007 895-1098 OSCILLATOR TRANSFORMER Q001 921-1159 RF AMPLIFIER TRANSISTOR FET Q002 921-1160 MIXER TRANSISTOR NPN Q003 921-1161 OSCILLATOR TRANSISTOR NPN R001 863-3023 100KOHM 5% 1/4W CARBON FILM RES R002 863-3023 100K OHM 5% 1 /4W CARBON FILM RES R003 863-3024 1M OHM 5% 1 /4W CARBON FILM RES R004 863-3014 47 OHM 5% 1 /4W CARBON FILM RES R005 863-3015 68 OHM 5% 1 /4W CARBON FILM RES R006 863-3021 100 OHM 5% 1/4W CARBON FILM RES R007 863-3018 4700 OHM 5% 1 /4W CARBON FILM RES R008 863-3020 22K OHM 5% 1 /4W CARBON FILM RES

R009 863-3016 1K OHM 5% 1 /4W CARBON FILM RES R010 863-3022 100 OHM 5% 1/4W CARBON FILM RES R011 863-3018 4700 OHM 5% 1 /4W CARBON FILM RES R012 863-3017 1500 OHM 5% 1 /4W CARBON FILM RES R013 863-3019 10K OHM 5% 1 /4W CARBON FILM RES R014 863-3019 10K OHM 5% 1 /4W CARBON FILM RES T001 895-1095 IF TRANSFORMER

PART NO.

DESCRIPTION

36

NOTES

37

MODELS

MC7031,

MC7041 -

IC901,

IC951 BLOCK DIAGRAM

MODELS

MC7031,

MC7041 - IC201 BLOCK DIAGRAM

38

MODELS

MC7031,

MC7041 - IC301 BLOCK DIAGRAM

39

MODEL MC7051 - IC101 BLOCK DIAGRAM

MODEL MC7051 - IC201 BLOCK DIAGRAM

40

MODEL MC7051 - IC301 BLOCK DIAGRAM

41

NOTES

42

MODEL MC7031 - DE-EMPHASIS SWITCH

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7031 - FUNCTION SWITCH

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

43

MODEL MC7031 - FUNCTION INDICATOR

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7031 - CONTROL AND PREAMP

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

TEST

POINTS

FM.ANTENNA

A;

1ST

FMIF INPUT

D;

2ND

FMIFOUTPUT

G;

FM

DETECTOR OUTPUT

H;

AM.RF. & IF.

l»KHZ

AM

GAIN

IF

INPUT

WPUT

L;

M;

K;

INTUT

NOTE

1

ALL RESISTANCE VALUES IN OHM K:KILOHM , M:MEGOHM

THE

WATTAGE OF RESISTORS NOT SPECIFICALLY DESIGNATED

IS

1/4 WATT

2 UNLESS OTHERWISE NOTED IN SCHEMATIC ALL CAPACITORS IN MF

PF-

PICOFARAD

3.

THERE MIGHT BE SLIGHT CHANGES IN THE ACTUAL SET

4.

ALL VOLTAGES ARE DC UNLESS OTHERWISE SPECIFIED

O.C. VOLTAGES SHOWN ARE MEASURED FROM CHASSIS, WITH

NO

SIGNAL INPUT, LOUDNESS SWITCH IN "OFF" POSITION, LINE

VOLTAGE 120V . AC USING A HIGH IMPIDANCE DIGITAL MULTIMETER.

IMPORTANT

WHEN SERVICING THIS CHASSIS,

UNDER THE ORIGINAL DESIGN OR ALTERED WITHOUT PERMISSION

FROM

RATION. BE REPLACED ONLY WITH TYPES

IDENTICAL

INAL CIRCUIT. SPECIAL COMPONENTS SHOCK CRITICAL COMPONENTS ARE SHADED ON

THE

LIST

FOR

SAFETY NOTICE

NO

CIRCUMSTANCES SHOULD

THE

ZENITH RADIO CORPO-

ALL

COMPONENTSSHOULD

TO

ARE

USED

AND

FIRE HAZARD. THESE

SCHEMATIC

EASY IDENTIFICATION.

THOSE

BE

MODIFIED

IN THE

TO

PREVENT

AND

ORIG-

PARTS

IC

301

PIN MONAURAL

1

11.45

2 3.2 3.1

3

5.5

4

9.0

5

9.0

6

13.7

7

0

8

0.04 .4

9 2.4

10

1.58 1.56

II

2.2

12

2.4

13

2.4 2.4

14

3.3

IC

VOLTAGES

STEREO

12

5.2

9.3

.3

0.7

0

2.37

2.4

3.2

THIS CIRCUIT DIAGRAM CASIONALLY DIFFER FROM ACTUAL CIRCUIT USED. THIS IMPLEMENTATION SAFETY

AND PROVEMENT CHANGES INTO SET

IS NOT NEW SERVICE LITERATURE PRINTED.

NOTE

- SEE

OF THE

PERFORMANCE

DELAYED UNTIL

PARTS LIST

PRODUCTION CHANGES

MAY OC-

THE

WAY,

LATEST

IM-

THE

IS

FOR

VR CONTROL

R404

VOLUME

R406

BALANCE

R4I4

BASS

R4I7

TREBLE

SWITCHES

S 501

POWER (ON-OFF)

SI FUNCTION SELECTOR

(AM FM. PHONO AUX)

S2

AFC (ON-OFF)

S3

MUTING (ON-OFF)

S4

LOUDNESS (ON-OFF)

S5

MODE (MONO-STEREO)

S6

HIGH FILTER (ON-OFF)

S7

LOW FILTER (ON- OFF)

MONITOR (TAPE-SOURCE)

S8

S9

SPEAKER (OFF-A.B A B)

SIO

DE - EMPHASIS (

MODEL MC7031 - SCHEMATIC

75US

- 25US )

AF BOARD TRANSISTORS NO

01401,1491

01402 ,1492

01403,1493 01404,1494

01406,

QI406,

01407,

0I4O8,

01409,1499 DRIVER

01410,

01-411,

01412,

1499

1456

1457

1458

l4«o

1461

1462

DE3CRPTI0N

DFF AMP

CURRENT SOURCE

BIAS

01FF AMP

PRE DRIVER

BIAS

PROTECTOR

DRIVER OUTPUT

OUTPUT

SWITCH: POSITIONS

1. AM.(SHOWN)

2

FM

3.

PHONO

4.AUX.

CONNECTIONS

5- 1

5-2

5-3

5-4

ARROW INDICATES MOVEMENT OF WIPER CORRESPONDING

TO

CLOCKWISE ROTATION OF SHAFT. SWITCH CONTACTS HAVE BEEN ASSIGNED ALPHANUMERIC DESIGNATIONS TO ASSIST SERVICE TECHNICIANS IN CIRCUIT

TRACING.

44

45

MODEL MC7031 - RF/IF/MPX/PHONO PREAMP

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7031 - POWER AMP/POWER SUPPLY

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

TEST POINTS

FM ANTENNA INPUT

A; D; 1st

FM F

INPUT

G;

2ND

FM IF

AM.

RF.

Si IF

I9KH2 GAIN AM

IF

INPUT

OUTPUT

INPUT

H; FM DETECTOR OUTPUT

L;

M; K;

NOTE

l_ ALL RESISTANCE VALUES IN OHM K! KILOHM M:MEGOHM

THE WATTAGE OF RESISTORS NOT SPECIFICALLY DESIGNATED IS I/4 WATT.

2 UNLESS OTHERWISE NOTED IN SCHEMATIC ALL CAPACITORS IN MF

PF * PICOFARAD

3. THERE MIGHT BE SLIGHT CHANGES IN THE ACTUAL SET

4 ALL VOLTAGES ARE DC UNLESS OTHERWISE SPECIFIED

DC.

VOLTAGES SHOWN ARE MEASURED FROM CHASSIS,

WITH NO SIGNAL INPUT, LOUDNESS SWITCH IN "OFF" POSITION

LINE VOLTAGE I20V AC USING A HIGH IMPEDANCE

DIGITAL MULTIMETER

IMPORTANT SAFETY NOTICE

WHEN SERVICING THIS CHASSIS,

UNDER

NO THE ORIGINAL DESIGN OR ALTERED WITHOUT PERMISSION

FROM RATION.

BE REPLACED ONLY WITH TYPES

IDENTICAL

INAL CIRCUIT. SPECIAL COMPONENTS SHOCK CRITICAL COMPONENTS ON

LIST

CIRCUMSTANCES SHOULD

THE

ZENITH RADIO CORPO-

ALL

COMPONENTSSHOULD

TO

THOSE

ARE

USED

AND

FIRE HAZARD. THESE

THE

SCHEMATIC

FOR

EASY IDENTIFICATION.

BE

IN THE

TO

ARE

AND

MODIFIED

ORIG-

PREVENT

SHADED

PARTS

IC VOLTAGES

IC 30I

MONAURAL,

STEREO

11.45 12

I

3.2

2

5.5 5.2

3

9.0

4 5 9.0 9.3

6

I5.7 0.7 7 0 0

8 0.07 9 2.4 IO

1.56 1.56

II

2.2

12 2.4 2.4

2.4

13

3.3

14

3.I

9.3

2.4

2.37

2.4

3.3

THIS CIRCUIT DIAGRAM CASIONALLY DIFFER FROM ACTUAL CIRCUIT USED. THIS IMPLEMENTATION SAFETY

AND PROVEMENT CHANGES INTO SET

IS

NOT NEW SERVICE LITERATURE PRINTED.

NOTE - SEE

OF THE

PERFORMANCE

DELAYED UNTIL

PARTS LIST

PRODUCTION CHANGES

MAY OC-

THE

WAY,

LATEST

IM-

THE

IS

FOR

R403 R405 R411 R4I7

CONTROL

BALANCE VOLUME TREBLE BASS

AF BOARD TRANSISTORS

NO

SWITCHES

S

50I

POWER

(ON -OFF)

FUNCTION SELECTOR

SI

[AM

FM

PHONO AUX

AFC (ON -OFF)

S2

MUTING (ON-OFF)

S3

LOUDNESS (ON-OFF)

S4

MODE ( MONO - STEREO)

95

HIGH FILTER (ON-OFF)

S6 S7

LOW FILTER (ON-OFF)

S8

MONITOR (TAPE - SOURCE)

S9

SPEAKER (OFF - A.B.A+B)

SIO

DE-EMPHASIS ( 75us-

QI40I, I45I DIFF AMP

QI402, I452

Q1403, I453 Q1404,1454

]

QI405,1455 PRE DRIVER

Q1406,1456 BIAS

Q1407,1457 Q1406,1458

!1409,1459 DRIVER QI4I0,

Q1411,

25uS>

Q1412 ,1462

1460 DRIVER

1461 OUTPUT

MODEL MC7041 - SCHEMATIC

DESCRIPTION

CURRENT SOURCE

BIAS DlFF

AMP

PROTECTOR PROTECTOR

OUTPUT

SWITCH:

POSITIONS

1.

AM.

(SHOWN) 5 - 1

2

FM

3. PHONO 5-3

4. AUX 5-4

CONNECTIONS

5 -2

PRINTtD CIRCUIT SWITCH NOTES

ARROW INDICATES MOVEMENT TO CLOCKWISE ROTATION SWITCH CONTACTS HAVE BEEN ASSIGNED ALPHANUMERIC) DESIGNATIONS CIRCUIT TRACING.

TO

OF

WIPER CORRESPONDING

OF

SHAFT

ASSIST SERVICE TECHNICIANS

IN

46

TERMINAL

VOLTAGE OF AF-BOARD TRANSISTORS

N

0

Q1401 , 1451

0Q1

402 , 1452

QI403

, 1453

Q1404, 1454

Q1405

, 1455

Q1406, 1 456

Q1407, 1457 Q1408, 1458

Q1409, 1459

Q14

10,1460

Q1411,

1461

Q1412 , 1462

Q501

Q502

E

0.64 V

31.0V

30.

9V

0.64

V

30.5

V

-I.I6V

0.

01V

-

0.01V

0.57V

-

0.59

0.01

-0.01V

+13.25

-13.8

V

30.2V

30.4

30.2V

30.2

29.9

-0.48V

0.01

-

0.02 V

1.17

-1.17V

0.57

-

0.59V

+13.9V

-

14.45

B

V

C

0.04

30.2

0.04

1.17

1.

17

0.78

-0.78

30.8

-30.8V

3

0.8 V

-30.8V

+14.9

-14.7

V

47

MODEL MC7041 - RF/IF/MPX/PHONO PREAMP

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7041 - POWER AMP/POWER SUPPLY

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7041 - DE-EMPHASIS SWITCH

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7041 - FUNCTION SWITCH

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7041 - CONTROL AND PREAMP

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7041 - FUNCTION INDICATOR

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

48

49

MODEL MC7051 - POWER SUPPLY

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7051 - PHONO PREAMP

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

IMPORTANT SAFETY NOTICE

WHEN SERVICING THIS CHASSIS,

UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION

FROM THE ZENITH RADIO CORPO-

RATION.

ALL COMPONENTSSHOULD

BE REPLACED ONLY WITH TYPES

IDENTICAL TO THOSE IN THE ORIG-

INAL CIRCUIT. SPECIAL COMPO-

NENTS ARE USED TO PREVENT SHOCK AND FIRE HAZARD. THESE CRITICAL COMPONENTS ARE SHADED ON THE SCHEMATIC AND PARTS

LIST FOR EASY IDENTIFICATION.

THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED. THIS WAY,

IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE

NEW SERVICE LITERATURE IS PRINTED.

NOTf

1 SELECTOR SWITCH I AM 2 FM 3 PHONCXI) 4. PH0NCX2) 3. AUX 6. MIC 7. COMMON

2 ALL RESISTANCE VALUES IN OHMS KKILOHM M:MEGOHM,ALL RESISTORS 1/4W UNLESS OTHERWISE SPECIFIED

3 UNLESS OTHERWISE NOTED IN SCHEMATIC ALL CAPACITORS IN MFD PF PICOFARAD

4 THERE MIGHT BE SLIGHT CHANGES IN THE ACTUAL SET

3 ALL VOLTAGES ARE DC UNLESS OTHERWISE SPECIFIED, DC VOLTAGES SHOWN ARE MEASURED FROM CHASSIS

WITH

NO SIGNAL INPUT, LOUONESS SWITCH IN OFF

A HIGH IMPEDANCE DIGITAL MULTIMETER

POSITION.

LINE

VOLTAGE

I20V

AC,

USING

TEST

POINTS

A

FM.

ANTENNA INPUT

1ST. FM.

IF.

D F G

H K

L M

INPUT MPX. INPUT FM

IF OUTPUT

FM

DETECTOR OUTPUT AM IF INPUT AM.

RF INPUT

19KHZ OSCILLATOR OUTPUT

SWITCHES

SW

1

SELECTION AM FM PHONO(1) PHONO(2) AUX MIC)

SW

2

TAPE

DUBBING (1-> 2 OFF 2->1)

SW

3

TAPE

MONITOR (1 SOURCE 2)

SW4

MODE

(STEREO - MONO)

SW5

LOUDNESS

SW6

SW7 SW8

1W9 DE

SW10

SW

1 1

SW2

1,5 2,6 3,7

4

,8

9,13

10,14

11,15

12,16

(ON - OFF)

FM

MUTE

(ON - OFFJ

HIGH

FILTER (ON-OFF)

LOW

FILTER (ON- off)

EMPHASIS ( 25us - 75us)

SPEAKER (OFF A . B . A+B) POWER

(ON-

OFF

)

TAPE DUBBING SWITCHES

A— 8 RIGHT OFF

RIGHT

B—A RIGHT COMMON RIGHT

A - B LEFT

OFF

LEFT

B-A LEFT

COMMON LEFT

SW3 TAPE MONITOR SWITCHES

1,5

PLAY BACK

(1)

2,6

SOURCE RIGHT

3,7

FLAY

4,8

COMMON RIGHT

9,11

10,14

11,15 PL AY BACK(2) LEFT

12,16

SW10 SPEAKER SWITCHES

1,6

OFF RIGHT

2,7

A RIGHT

3,3

B RIGHT

4,9

A+B

5,10

COMMON RIGHT

11,16

12,17

13,8 B

14,19

15,20

RIGHT

BACK(2)

RIGHT

PLAY BACK(1) LEFT

SOURCE LEFT

COMMON LEFT

RIGHT

OFF

LEFT

A LEFT

LEFT

A+B

LEFT

COMMON LEFT

MODEL MC7051 - SCHEMATIC

50

IC 101

PIN NO VOLTAGE

1

2

3

4

5.1

V

2.2

V

11.5 V

9.2

V

5 II.5V

6 3.6V

7 1.3V 8 2.8V 9 8.5V

10 0 V 11 12.2V 12 1.5V 13 0.7V 14 1.4V 15 0 V 16 1.0V

IC 201

PIN NO VOLTAGE

1 2.0V 2 2.0V 3 2.0V 4 0 V

5 1.5V 6 5.6V 7 5.6V 8 5.6V 9 5.6V

10 5.6V 11 11.8V 12 3.7V 13 0 V 14 0 V 15 4.8V 16 0 V

IC 301

PIN NO VOLTAGE

1

11.3 V

2 3.0V

3

5.1

V

4 8.2V

5 8.2

V 6 8.3V 7 0 V

8 0 V

9 2.3 V

10 1.5V 11

2.2V 12 2.2V 13

2.2

V

14 3.2V

51

MODEL MC7051 - RF/IF/MPX

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7051 - CONTROL AND PREAMP

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

52

MODEL MC7051 - DIAL LIGHT

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7051 - SPEAKER PROTECTION

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

53

MODEL MC7051 - AUDIO OUTPUT

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

MODEL MC7051 - FUNCTION INDICATOR

CHASSIS WIRING AND COMPONENTS VIEWED FROM FOIL SIDE

TEST POINTS

A

FM

ANTENNA INPUT

FM.

IF

D G H F.M. L M

INPUT

F.M IF.

OUTPUT

DETECTOR OUTPUT AM RF. 19KHz

OSC.

INPUT

OUTPUT

TRANSISTORS

NO Q1 Q2 Q3 Q101 Q102 Q103 Q201 Q301 Q302 Q352 Q401 Q451 Q402 Q452 Q501 Q502 Q503 Q504 Q1401 Q1451 Q1402 Q1452 Q1403 Q1453

AND

INTEGRATED

DESCRIPTION FM-RF

NO

Q1404 DIFFERENTIAL FM-MIXER Q1454 FM-OSCILLATOR AM-RF & MIXER AM-1ST

IF

AM-2ND

IF

FM-1ST

IF

STEREO LAMP MPX

OUTPUT

MPX

OUTPUT

AUDIO

SW

1ST AMP

2ND AMP

Q1405

Q1455

Q1406

Q1456

Q1407

Q1457

Q1408

Q1458

Q1409

Q1459

Q1410

Q1460

Q1411 REGULATOR

REGULATOR

Q1461

Q1412

Q1462 DIFFERENTIAL

DIFFERENTIAL AMPLIFIER

AMPLIFIER CURRENT

CURRENT SOURCE

SOURCE

IC201

IC301

IC901

IC951 BIAS

TRANSISTOR MOUNTING VIEW

(Q1411,1412,1461,1462)

CIRCUITS

DESCRIPTION DIFFERENTIAL AMPLIFIER

AMPLIFIER

PRE-DRIVER

BIAS

PROTECTOR

DRIVER

OUTPUT

FM-IF

& DET

MPX PLL

DEMOD

PHONO EQUALIZER

PHONO EQUALIZER PRE-AMPUFIER

PRE-AMPUFIER

MODEL MC7031 - CHASSIS LAYOUT

DIAL CORD DRIVE

SHOWN

IN

FULL COUNTERCLOCKWISE POSITION

54

TEST POINTS

A

FM

ANTENNA INPUT

FM.

IF

D

FM IF.

G

H

FM.

DETECTOR OUTPUT L AM RF. M

19KHZ

INPUT

OUTPUT

INPUT

OSC

OUTPUT

TRANSISTORS

NO

DESCRIPTION FM-RF

Q1 Q2

FM-MIXER Q1454

Q3

FM-OSCILLATOR

Q101

AM-RF & MIXER

Q102

AM-1ST Q103 Q201 Q301 Q302 Q352 Q401 Q451 Q402 Q452

IF

AM-2ND

IF

FM-1ST

IF

STEREO LAMP

MPX

OUTPUT

MPX

OUTPUT

AUDIO

1ST AMP

AUDIO

1ST AMP

AUDIO

2ND AMP

AUDIO

2ND AMP

Q501 Q502

REGULATOR

Q503 Q504 Q1401

DIFFERENTIAL

AMPLIFIER

Q1451

AMPLIFIER IC301 Q1402 CURRENT

CURRENT

SOURCE

SOURCE IC951 Q1403

BIAS

Q1453

AND INTEGRATED

NO Q1404

Q1405 Q1455 Q1406 Q1456 Q1407

SW

Q1457 Q1408 Q1458 Q1409 Q1459 Q1410 Q1460 Q1411 Q1461 Q1412 Q1462 IC201 FM-IF

IC901 PHONO EQUALIZER

CIRCUITS

DESCRIPTION DIFFERENTIAL

DIFFERENTIAL

AMPLIFIER

PRE-DRIVER

BIAS

PROTECTOR

DRIVER

OUTPUT

& DET

MPX PLL

DEMOD PHONO EQUALIZER PRE-AMPLIFIER Q1452

PRE-AMPLIFIER

TRANSISTOR MOUNTING

( QI4II,

I4I2.I46I.I462)

VIEW

55

MODEL MC7041 - CHASSIS LAYOUT

SHOWN

DIAL

CORD

IN FULL

COUNTERCLOCKWISE

DRIVE

POSITION

NO

Q201 FM-IF Q301 Q302 Q303 Q304 FM-AF OUTPUT Q501 Q502 Q503 Q701

Q702 EQUALIZER AMPLIFIER Q703 Q704 Q705 Q706 EQUALIZER AMPLIFIER Q707 Q708 Q709

Q710 Q711 Q712 Q713 Q751 Q752 Q753 Q754 Q755 Q756 Q757 Q758 MIC EQUALIZER AMPLIFIER Q901 Q902 Q903 AF Q951 Q952 Q953

EQUALIZER AMPLIFIER

CURRENT DETECTOR CURRENT DETECTOR +

- DC DETECTOR

DESCRIPTION

1ST

AMPLIFIER FM AUDIO AMPLIFIER STEREO LAMP SWITCH FM-AF OUTPUT

REGULATOR REGULATOR DRIVER

EQUALIZER AMPLIFIER EQUALIZER AMPLIFIER EQUALIZER AMPLIFIER

DC DETECTOR

DC SWITCH

DC DRIVER

RELAY DRIVER

EQUALIZER AMPLIFIER EQUALIZER AMPLIFIER EQUALIZER AMPLIFIER EQUALIZER AMPLIFIER

EQUALIZER AM PURER EQUALIZER AMPLIFIER MIC EQUALIZER AMPLIFIER

AF

1ST

AF

2ND 3RD

AF

1ST

AF

2ND

AF

3RD

.

AMPLIFIER

TRANSISTOR

TEST POINTS

FM.

ANTENNA INPUT

A H

FM.

DETECTOR OUTPUT

AM-

IF

AM.

1ST. FM.

NO

101

201

Q1 Q2

Q3

INPUT

RF

INPUT

FM IF

INPUT

IF

OUTPUT

TRANSISTOR

CURRENT SOURCE

BIAS

PRE DRIVR

DRIVER DRIVER OUTPUT OUTPUT CURRENT SOURCE BIAS DIFF DIFF PRE DRIVER

OUTPUT

AM.

RF IF

FM

IF

STEREO DETECTOR FM

RF

FM CONVERTER FM OSCILLATOR

DESCRIPTION

AMP AMP

DETECTOR

AMPLIFIER

K

L

M 19KH2 OSCILLATOR OUTPUT D

G F MPX INPUT

Q1401

Q1402 Q1403 DIFF Q1404 DIFF Q1405 PRE DRIVER

Q1406

Q1407 Q1408 Q1409 Q1410 Q1411

Q145I

Q1452 Q1453 Q1454 Q1455 Q1456 BIAS Q1457 PRE DRIVER

Q1458 DRIVER

Q1459 DRIVER

Q1460 OUTPUT Q146I

IC

IC 301

DIAL CORD DRIVE

SHOWN

IN

FULL COUNTERCLOCKWISE POSTION

MODEL MC7051 - CHASSIS LAYOUT

56

S

501

POWER SWITCH

S 1

FUNCTION SWITCH.

S 2

FM

AFC SWITCH

S 3

FM

MUTE SWITCH S 4 LOUDNESS SWITCH S 5

MODE SWITCH

S 6

HI

- FILTER SWITCH.

S 7 LOW - FILTER SWITCH .

S 8

MONITOR SWITCH.

S 9

SPEAKER SELECTOR SWITCH

R404

VOLUME.

R406

BALANCE

R414

BASS

R417

TREBLE

57

MODEL MC7031 - EXPLODED VIEW

S 501

POWER SWITCH

S 1

FUNCTION SWITCH.

S 2

FM

AFC SWITCH S 3 FM MUTE SWITCH. S 4 LOUDNESS SWITCH S 3 MODE SWITCH. S 6

HI-FILTER SWITCH. S 7 LOW-FILTER SWITCH. S 8

MONITOR SWITCH. S 9

SPEAKER SELECTOR SWITCH . R 403 BALANCE R 403

VOIUME . R 411 TREBLE

BASS.

R 417

MODEL MC7041 - EXPLODED VIEW

58

59

MODEL MC7051 - EXPLODED VIEW

NOTES

60