Sams Mhf-37 User manual

Bell &

Howell

3650

Electrohome

Manhattan,

SC420

General

Electric

Cb.

PK170

Hitachi

DPK-340

Morse

I

Eleetrophonic

R-

12A,

T-

100A,

T600A

Panasonic

SA-

5800 —

RCA

YZ0596W

Sears-Silvertone

548.742717000 —

Sony

HP-510

Symphonic

1253,1253T

$3.95

$4.95

IN

CANADA

Cat.

No.

MHF-37

f

OM'

modular

1

1rl

. i

component;

MHF-37

REPRODUCED

THROUGH

THE

COURTESY

OF

THE

MANUFACTURER

çdL

HOWARD

W.

SAMS

lit

CO.,

INC.

INDIANAPOLIS,

INDIANA

First

Edition

First

Printing—

May,

1973

Copyright

C)

1973

by

Howard

W.

Sams &

Co.,

Inc.

Indianapolis,

Indiana

46206.

Printed

in

the

United

States

of

America

All

rights

reserved.

Reproduction

or

use,

without

express

permission,

of

editorial

or

pictorial

content,

in

any

manner,

is

prohibited.

No

patent

lia-

bility

is

assumed

with

respect

to

the use of the

information

contained

herein.

Library

of

Congress

Catalog

Card

Number

72-77606

...modular

hi-

In

component/

TABLE

OF

CONTENTS

Model

Number

Page

Bell &

Howell

3650

5

Electrohome

Manhattan (

Ch.

H18-202),

15

SC420 (

Ch.

H18-201)

General

Electric

A505g1h,

C172g,

C460g,

C467g

I

h,

8270g,

6504g/h,

8507g,

P774g,

P775g (

Ch.

P1(170)

23

Hitachi

DPK-340

33

Moire

I

Electrophonic

R-

12A,

T-

100A,

T60011 .

43

Panasonic

SA-

5800

63

RCA

YZD596W

73

Sears-Silvertone

548.74210000

81

Sony

HP-

510

91

Symphonic

1253,

1253T

111

Cumulative

Index

to

Prior

Volumes

127

GENERAL

SERVICING

INFORMATION

The

following

information

applies to

all

players

in

this

volume,

and

should be

followed

before

any

adjustments

are

made

or

trouble

diagnosis

is

attempted.

Any

exceptions

or

additions

will

be

found

in

the

detailed

servicing

procedures

for

each

player.

POWER

SOURCES

Many

players

require

full

supply

voltage

for

proper

operation.

Be

sure

the

supply

voltage

is

maintained

at

the

rated

value

under

load

while

making

adjustments.

CLEANING

Head

faces

should

be

cleaned

with

head

cleaner

to

remove

dust

and

accumulated

oxide. (

An

applicator

may

be

fashioned

from

absorbent

cotton.)

Do

not

use

a screw-

driver

or

any

metallic

object

near

the

head

faces.

CAUTION:

Avoid

getting

head

cleaner

on

any

plastic

surface.

Clean

capstans,

pressure

rollers,

and

tape

guides

with

alcohol

using a

soft

lint-

free

cloth.

Also

use

alcohol

to

remove

oil

and

grease

from

drive

belts

and

other

driving

surfaces.

LUBRICATING

Clean

all

surfaces

before

lubricating.

Apply

a

few

drops

of #

20

machine

oil

to

all

bearings

and

rotating

bushings.

Apply

a

thin

film

of

light,

nonhardening

grease

to

all

cam

surfaces

and

pawls,

if

they

have

been

factory

lubricated.

Always

wipe

excess

oil

or

grease

from

parts

that

have

been

lubricated.

CAUTION:

Oil

and

grease

must

be

kept

off

all

driving

surfaces

as

well

as

any

parts

which

may

transfer

oil

or

grease

to

them.

DEMAGNETIZING

Heads

require

demagnetizing

at

regular

intervals

to

maintain

high-

frequency

response,

dynamic

range,

and

low

distortion. (

Follow

instructions

included

with

the

demag-

netizing

unit.)

After

demagnetizing

the

heads,

keep

all

screwdrivers

and

other

metallic

objects

away

from

the

head

faces.

Tape

guides

may

also

require

occasional

demag-

netizing.

IMPORTANT:

Be

sure

to

demagnetize

the

heads

after

making

resistance

measurements

in

the

head

circuits.

CARTRIDGES

Many

problems

associated

with

tape

players

result

from

defective

cartridges.

Always

try

a

cartridge

known

to

be

good

before

attempting

repairs.

4

.4.10MI

modular

component/

Pages

5-14

Courtesy

of

BELL &

HOWELL

GENERAL

SERVICE

DEPARTMENT

Bell &

Howell

3650

ALIGNMENT

INSTRUCTION

Circuit

adjustment

The

instructions

for

adjusting

the

FM

and

AM

circuits

will

be

given

in

this

section.

1.

FM

Circuit

1-1.

Test

Equipment

Required :

FM

band

signal

generator :

400

Hz

30%

modulation (

22.5

KHz

deviation) ;

300

ohm

Output.

FM

IF

sweep

generator:

10.7

MHz ±

500KHz

VTVM:

Low

range

AF

Oscilloscope :

High

sensitivity

general

purpose.

Accurate

audio

generator (

SCA

signal

generator

7

KHz

dey.)

FM

stereo

signal

generator :

For

MPX

tests.

1-2.

IF

Amplifier

Alignment :

Note:

a.

For

safety,

the

output

should

be

connected

to

the

loudspeaker

or

equivalent

resistance

loads.

b.

Set

the

panel

controls

as

follows:

FUNCTION

selector

to

FM

VOLUME

control

at

minimum

output.

FM

AFC

switch

to

OFF.

V

curve

c.

The

output

of

IF

sweep

generator

should

be

connected

to

Test

Point

A (

the

connecting

point

of

R106,

220

ohm

and

C109

2pF).

d.

The

input

of

IF

sweep

generator

should

be

connected

to

Test

Point

B (

Q9

2

SC460

collector).

S

curve

e.

The

input

of

IF

sweep

generator

should

be

removed

from

Test

Point

B (

Q9

2

SC460

collector)

and

be

connected

to

Test

Point

C (

R336

15k

ohm).

f.

The

probe

for

input

or

output

of

IF

sweep

generator

should

be

connected

as

Fig.

1.

22Kn

0.04p

F

OUT

0—A,VW—I

PUT

For

OUTPUT

o

2PF

INPUT

0

22KC2

0.5p

F

o

44

1)

1.

0.01p

1

N60

mum

100KC2

For

INPUT

ci

For

INPUT (

S

curve)

/,

5

STEP

ADJUST

WAVEFORM

1

T,

T2,

T5, T9,

T11, T13,

(Primary)

Best

V

Curve

2

T13 (

Secondary)

Best

S

Curve

1-3.

FM

Tuner

Pack

The

FM

tuner

may

require

adjustments

when

the

signal

is

distorted

or

when

the

sensitivity

has

been

lowered.

Set

the

FUNCTION

selector

to

FM

and

the

FM

AFC

switch

to

OFF.

In

the

steps

to

follow,

the

FM

signal

generator

is

set

for

at

30%

modulation

at

400

Hz

at

the

RF

output

freque-

ncies.

For

the

output

indication,

the

VTVM

and

the

scope

in

parallel

are

connected

to

the

Right

speaker

outjack.

Step

1.

Set

the

generator

output

to

87

MHz

and

tune

the

receiver

to

this

signal.

Adjust

the

trimmer

FCT3

and

Coil

L5

for

maximum

output.

Step

2.

Set

the

generator

output

to

108.5

MHz

and

tune

the

receiver

to

this

signal.

Adjust

the

trimmer

FCT2

and

Coil

L3

for

maximum

output.

Step

3.

Set

the

generator

output

to

98

MHz

and

tune

the

receiver

to

this

signal.

Adjust

the

trimmer

FCT1

for

maximum

output.

Step

4.

Repeat

the

adjustment

of

Steps

1,

2,

and

3.

Note:

In

the

above

adjustments,

do

not

forget

to

keep

the

generator

output

level

as

low

as

possible

for the

best

results.

DIAL

STRINGING

Small

Pulley

4pcs

Large

Pulley

Tuning

shaft

6

o

C

511

001

560

4..„

„T

s4

C432

002

1

0

.(_.)..

Y

.-

C420

*1

5

1K

C430

as *

---

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@)ots \

141

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too»

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220

443

OK

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31

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LOCATION

OF

TUNER

PC

BOARD

r2r

39Ø

1M

e

PARTS

LOCATION

OF

IF

PC

BOARD

C12110

100P

C230

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3

162

o

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1403

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004

C'226

OOP

K

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C22

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OIM

•••••

600

1

4

C222

S

OK

4

PK

C219

Qom

<D.

•—€)

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t.

•

1'

12

R2.5

R237

•

680

8.18C

C-24.

C231 ?

OK

eg

z

C2I3

/l

ey

1

10 .

•

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CM "

4

T7

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T

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A-18.

C207

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0.04

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Ram

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)_

2

fl

C208

0.04

R

208 .

1(

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Note;

Resistors

with

dark

markings

are

low

noise

types.

PARTS

LOCATION

OF

MPX

PC

BOARD

c3o1

301

OOK

R302

80

L2

F21

CIOI

20P

Fc

TI

C127

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r,4

ns

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10000

T

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C3047•

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0.01

Q,,

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C102

SOP

100

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R113

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Alos

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R

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K

RI31

C70

680P

Rot

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1ANW.

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FM_

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OK

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R318

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WORN,

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Hr

9

10

11

1-4.

FM

Multiplex

Circuit

a.

Test

Equipment

required

SCA

signal

generator :

MPX

signal

generator:

FM

signal

generator:

VTVM:

Low

Range

AF

Dummy

load

selector : (

With

L

ch,

R

ch,

exchange

switch

and

8

ohm

Resistor

built-in)

Refer

to

Fig.2.

Exchange

Switch

INPUT

L

ch

INPUT

R

ch

F

ig.

3

67KHz

output

0.5V

Dev

7KHz

Modulation

1KHz

or 400

Hz

Modulation

1KHz

Deviation

L

33.7KHz

Dev. (

45%)

R

33.7KHz

Dey.

(

45%)

Pilot

signal

7.5KHz

Dev. (

10%)

Frequencies

98MHz

Deviation

75KHz (

100%)

T-

-

Dummy

Load

Selector

Oscilloscope :

High

sensitivity

general

purpose

b.

SCA

Circuit

Adjustments

Step

1.

SCA

SG

output

are

connected

to

C301 (

3uF/16V)

and

VTVM &

8

ohm

resistor

are

conne-

cted

to

the

jack

of

right

speaker

in

parallel.

Step

2.

FUNCTION

selector

is

set

to

FM

Stereo

position.

Step

3.

Adjust

the

transformers

T14

and

T15

to

maximum

audio

output

power

shown

by

SCA

signal.

c.

STEREO

Circuit

Adjustments

Step

1.

The

output

of

FM

signal

generator

is

connected

to

the

ANTENNA

terminal (

300

ohm)

of

the

set.

Step

2.

The

modulation

of

Stereo

signal

generator

is

changed

to'R

-

ch

signal

.

by

following

methods.

a.

Turn

the

Dummy

load

selector

toIrch

b.

FUNCTION

selector

is

set

to

FM

position

Step

3.

The

output

of

FM

signal

generator

should

be

turned

to

98

MHz,

30/4V

accurately.

Step

4.

Set

the

FUNCTION

selector

to

FM STEREO

position.

Step

5.

Connect

the

VTVM

to

transformer

T18 (

secondary).

Adjust

the

transformers

T16,

T17

and

T18

for

maximum

output.

Step

6.

Connect

the

VTVM

to

right

speaker

and

adjust

the

transformer

T18

for

maximum

output.

Bell &

Howell

3650

d.

SEPARATION

Adjustments

Step

1.

Set

the

output

of

FM

signal

generator

to

60

dB (

linV)

Step

2.

Set

-

Reh

volume

control

R450

to

the

position

of

2V (

8

dB)

Step

3.

Turn

the

stereo

signal

generator

from

-

Reh

to

-

Leh

and

bring

down

the

dummy

load

selector

switch

to"Reh.

Step

4.

Set

-

reh

volume

control

R415

to

the

output

position

of

2 \"' (

8d1i)

Step

5.

Turn

the

dummy

load

selector

switch

to

-

R

eh

side

without

changing

the

modulation

of

stereo

signal

generator,

and

then

adjust

the

volume

control

R318

for

-

Reh

output

less

than

18dB.

Step

6.

Change

the

modulation

of

Stereo

signal

generator

by

-

Reh

and

switch

on

dummy

load

selector

to

-

Leh.

and

then

confirm

to

be

less

than

18db

for

-

Leh

audio

output.

e.

Check

of

Stereo

indicator

lamp

Check

the

Stereo

indicator

lamp

whether

it

is

illuminated

or

not

when

the

stereo

signal

of

the

outputs (

26db)

is

received

from

FM

signal

generator.

AM

Circuit

Test

Equipment

Required

AM

standard

signal

generator

covering

the

455

KHz

IF

band

the

medium

wave

band.

The

modulation

is

set

to

30%

for

400

Hz

modulation

frequency. (

If

available,

a

sweep

generator

for

the

455

KHz

band

will

speed

up

the

alignment.)

VTVM :

Low

range

AI;

Oscilloscope :

General purpose

IF

Amplifier alignment

Note :

a.

For

safety,

the

output should

be

connected

to

loud

speakers

or

equivalent

resistance

loads.

b.

Set

the

panel

controls

as

follows :

FUNCTION

selector

to

AM

MODE

selector

to

MONO

VOLUME

control

at

fully

clockwise (

maximum)

c.

The

at a

Step

1.

Step

2.

Step

3.

Step

4.

Step

5.

modulated

455KHz

signal

is

connected

to

transistor

Q4 (

SE3001)

Base,

and

should

be kept

low

level

consistent

with

good

measurement.

Connect

the

VTVM

to

the

Right

speaker

terminal.

Connect

the

resistor

100K

ohm

to

the

transformer

T7 (

secondary).

Adjust

the

IF

transformer

T6,

17,

Tb,

and

T12

for

maximum

indication.

Repeat

the

step

3

two

or

three

times.

Disconnect

the

resistor

100k

ohm

from

the

transformer

T7 (

secondary).

AM

Tuning

circuit

The

panel

control

setting

is

the

same

as

for

IF

amplifier

tests.

The

VTVM (

and

scope)

connection

is

made

to

the

right

speaker

terminal.

The

signal

generator

is

set

to

30%

modulation

of

400

Hz

output.

Step

1.

Set

the

generator

to

600KHz

and

connect

to

loop

antenna.

Tune

the

receiver

to this

signal.

Step

2.

Adjust

the

oscillator

coil

T4

and

the

shorting

ring

on

the

antenna

loopstick

L6

for

maximum

output.

Step

3.

Set

the

generator

to

1,400KHz

and

tune

the

receiver

to

this

signal.

Step

4.

Adjust

the

trimmers

ACT1,

and

ACT2

for

maximum

output.

Step

5.

Repeat

the

steps

1

through

4

two

or

three times

for the

best

tracking.

NOTE:

WHEN

ORDERING

PARTS

NOT

OTHERWISE

LISTED,

ORDER

FROM

MANUFACTURER

BY

ITEM

NUMBER

AND

DESCRIPTION.

SEMICONDUCTORS

ITEM

PART

NO./TYPE

D1

1S21398

D3

1N60

D4

1N60

D5

HV-23

D6

1N60

D7

1N60(P)

D8

1N60(P)

D9

1N60(P)

Q1

0

1N60(P)

Dl]

1N60

P )

D12

1N60(P)

013

1N60(P

D14

1N60 (

P )

D15

10D-1

D16

100

-

1

D16

10D-1

017

100-1

D19

10D-1

D20

10D-1

Q1

5E5050

Q2

SE5006

Q3

SE5006

Q4

Q5

Q6

Q7

Q8

Q9

Q10

Q11

Q12

Q13

Q14

Q15

Q16

Q17

Q18

Q19

Q20

Q21

Q22

Q23

Q24

Q25

Q26

5E3001

SE3001

CS9016

CS

9016

2SC460

SE1001

S El

001

SE1001

CS9012

SE4010

2SB187

2SB186

2SB474

ELECTROLYTIC/VARIABLE

CAPS

ITEM

VALUE

AC]

AC2

AC3

ACT1

ACT2

C116

C129

C213

C228

C231

C301

C302

C308

C309

C313

C326

C330

C402

C403

C404

C405

C406

C409

C410

C411

C412

C414

C415

C417

C425

C427

C428

C430

C431

C501

C504

C508

C510

C512

C513

C514

AM

Tuning

Gang

AM Antenna

Trimmer

AM

Oscillator

Trimmer

33mfd

16V

22mfd

6.3V

lOmfd

16V

lOmfd

16V

lOmfd

33mfd

3.3mfd

33mfd

3.3mfd

100red

.47mfd

lOmfd

3.3mfd

220mfd

100mfd

3.3mfd

100mfd

470mfd

.

47mfd

3.3mfd

100mfd

3.3mfd

100mfd

470mfd

100mfd

500mfd

1000mfd

470mfd

16V

1.6V

16V

25V

16V

25V

6.3V

16V

6.3V

25V

16V

6V

16V

6V

25V

50V

Dual

50V

25V

FC1

FC2 FM

Tuning

Gang

FC3

FCT1

FCT2

FCT3

FM

RF

Tuner

FM

Antenna

Trimmer

FM

Oscillator

Trimmer

CONTROLS/S

PEG

I

AL

RES

I

STORS

ITEM

PART

NO.

DESCRIPTION

R318

R382002

10K

Separation

R335

6.8 ohm

R431 .

5

ohm

WW

R434 .

5

ohm

WW

R463 .

5

ohm

WW

R467 .

5

ohm WW

R471

R382009

2000

ohms

Gain

R472

R361033

100K

Balance

TH1 D-

1A

Thermistor

TH2

D-

1A

Thermistor

TH3

D-

1A

Thermistor

TH4

D-

1A

Thermistor

COI

LS/TRANSFORMERS

ITEM

PART

NO.

Il

12

T3

14

T5

16

T7

T9

110

T11

K-112

K-113

RM018

0M0163

WM1401

A-16

A-18

WM1401

B-15

WM1402

T12

C-24

T13

WM1403

T14

H801

T15

H801

T16

H802

117

R120049

R18

H804

R19

H803

120

R1

20049

T21

R110080

MISCELLANEOUS

NAME

PART

NO.

Fuse,

IA

Fuse, .

7A

P.C.

Board,

RF

P.C.

Board,

IF

P.C.

Board,

MPX

P.C.

Board,

Audio

Switch,

Selector

Switch,

Power

Switch,

Mode

Switch,

Loudness

CABINET

PARTS

NAME

R412009

R412010

R530188A

R530189B

R530191B

R5301 92B

R421023

R429025

R429024

PART

NO.

Board,

Side

R849027

Cover, Top

R651396

Cover,

Bottom

R651169

Panel,

Rear

R651383

Plate,

Control R636491

Plate,

Decoration

R636492

Trim,Escutcheon

R810900

Knob,

Selector

R871129

Knob,

Tuning

R871128

Assembly,

Speaker

Cabinet

R849028

12

13

14

fa

mi

moduler

hi-fi

component/

Pages

15-22

Courtesy

of

ELECTROHOME

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VOLTAGES

0

FUN.

01

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FM

02

-10.2

-10.9

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FM

03

-4.5 -5.0

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FM

04

-6.6

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05

-9.2 -9.6

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06

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FM

07

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FM

08

-4.7 -5.5

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FM

09

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„

C1)

>ID

40"

ALIGNMENT

INSTRUCTIONS

ir

to.r.

!Le

gir=;

130/

e

orE2ó.

4

LE:

àfx

u

.

2

g

a

E.EE

g

2

m'egg

<

gggé

I- a5

I-

a.

âif

2

I

mle

FM

IF

SWEEP

ALIGNMENT

Electrohome

Manhattan (

Ch.

H18-202),

SC420 (

Ch.

H18-201)

—

SO

OMM

TERMINATION

Scope

to

TP

06

a

g

a

y

-

E

Repeat

Steps

6 &

7

until

no

improvement

can

be

made.

MULTIPLEX

ALIGNMENT

.2

E

g

.. I

1

9

I

FM

multiplex

FM

I

FMS

Same

AC

VTVM

T8,

T9

Adjust

for

maximum

1

generator

modulated

Atnenna

to

TP/8

indication.

set

input

level

as

!'

by

19

KHz

pilot.

low

as

possible.

-,

10 '

FM

MPX

gen.

Some

FMS ,

Same

AC

VTVM

T8, 19

KHz

Adiust

for

maximum

indication

modulated

by

MPX

to

Right

Channel

on

right

channel,

minimum

composite

jig !

composite

signal -

indication

on

left

channel.

I

----I—

'

i

right

channel.

1 --

FM

STEREO "

ON

THE

AIR"

ALIGNMENT

là2

à

E

g î

g

É

g <

174

-

e

Trimmers

C10-

0T

CIO-

CT

I

1

,

.

..J

AC

VTVM

TP/5

AC

VTVM

to

TP /

9

1

Listen to

one-

channel

modulation

1

.

r

FAIS

I

Point

of

no

Interference

Te

I:

g

2e...

gm

e

--.

m

-

FM

Ant.

Terminal

-

.

1-.

FM

Antenna

Terminal

r

E

,...

.

E

d

C2

re

Local

FM

Stereo

,

Station

FM

Dummy

Ant.

e

2

à

g -

.5

_

=

SEMICONDUCTORS

ITEM

01

02

D3

04

D5

D6

D7

D401

D402

ICI

(11

Q2

Q3

Q4

Q5

Q6

Q7

Q8

Q9

Q10

Q11

Q504

Q505

Q507 &

Q508

Q604

0605

Q607 &

Q608

PART

NO.

14-514-03

14-514-12

14-514-11

28-22-21

14-2000-04

14-2000-05)

14-700-D4

14-603-02

14-602-34

14-603-12

14-603-10

14-603-02

14-602-46

14-700-04

14-602-58

14-602-55

14-604-03

14-602-58

14-602-55

14-604-03

TYPE

1N43182AFC

1N542

TIS88

SE5006

S1891B

BF255

SE5006

BC169C

TIS88

S24612

TIS90

AD161/162

S24612

TIS90

AD161/162

ELECTROLYTIC/VARIABLE

CAPS

ITEM

C26

C52

C402

C525

C527

C553

C625

C627

PART

NO.

44-110005-03

44-110205-17

44-201-27

44-110106-06

44-147105-09

44-115006-04

44-110106-06

44-147105-09

45-68-01

VALUE

lOmfd

16V

1000mfd

16V

4900mfd

40V

100mfd

25V

470mfd

16V

15mfd

25V

100mfd

25V

470mfd

16V

Tuning

Gang

CONTROLS/SPEC

IAL

RESISTORS

ITEM

R513 &

R613

R514

R515 &

R615

R517 &

R617

R541

R543

R641

R643

PART

NO.

41-279-01

41-275-02

41-276-03

41-276-01

42-41-02

42 -

4

1-02

42-41-02

DESCRIPTION

500K

Dual

Volume

5meg

Balance

5meg

Dual

Bass

200K

Dual

Treble

.51

ohm

5% 5W

.51

ohm

5% 5W

.51

ohm

5% 5W

.51

ohm

5% 5W

COILS/TRANSFORMERS

ITEM

PART

NO.

Li

21-638-02

L2

21-653-01

L3

21-654-01

L4

21-652-02

L5

21-622-03

L6

21-607-07

L7

21-1400-03

(21-1400-09)

Tl

21-646-01

T2

21-646-02

T3

21-646-02

T4

21-647-01

T5

21-648-01

T6

21-648-01

T7

21-649-01

MISCELLANEOUS

ITEM

F401

SW1

SW2

SW4

SW5

NAME

Fuse, .

75A

Switch,

Function

Switch,

Power

Switch,

AFC

Switch,

Speakers

Assembly,

Tuner

P.C.

Board,

Tuner

P.C.

Board,

Audio

Amp

P.C.

Board,

Function

Switch

Speaker,

4-1/2"

(Models

H18-201,

SC420)

Speaker,

6"

(Models

H18-202,

Manhattan)

Speaker,

4"

(Models

H18-202,

Manhattan)

Cartridge,

Phono

Stylus,

Phono

Assembly,

Record

Changer (

Models

H18-201,

SC420) (

BSR

C124)

Assembly,

Record

Changer (

Models

H18-202,

Manhattan) (

BSR

C123)

PART

NO.

27-14-04

26-203-28

26-203-29

26-203-04

02-70142-01

(02-70142-10)

50-532-01

50-536-01

50-551-01

19-40019-02

19-6008-21

19-40017-21

16-250042-01

16-120064-15

16-90063-02

16-90056-02

CABINET

PARTS

NAME

PART

NO.

Panel,

Control

30-429-01

Scale,

Dial

30-430-01

Knob,

Bass/Treble/Balance

53-1261-01

Knob,

Loudness

53-1261-02

Knob,

Tuning

53-1295-01

Pushbutton,

Function

53-1296-01

Pushbutton,

AFC/Power

53-1296-02

Pushbutton,

Speaker

System

1

53-1296-03

Pushbutton,

Speaker

System

2

53-1296-04

Cover, Dust (

Models

H18-201,

SC420)

53-1297-01

20

21

22

modular

hi-fi

component/

General

Electric

Ch.

PK170

Pages

23-32

Courtesy

of GENERAL

ELECTRIC

COMPANY

ALIGNMENT

INSTRUCTIONS

CAUTION:

Use

isolation

transformer

or

observe

polarity

when connecting

test

equipnent.

Maintain

line

voltage

at

117VAC.

Allow

a

15-

minute

warm-up

period.

Use

only

enough

generator

output

to

obtain

a

suitable

indication.

AM

ALIGNMENT—

SELECTOR

IN

AM

POSITION

2

3.

4.

5•

4.

5.

Connect

generator

across

loop

fashioned

of

several

turns

of

wire.

Set

volume

at

maximum.

GENERATOR

FREQUEbRCY

RADIO

DIAL

SETTING

INDICATOR

ADJUST

REMARKS

455KC

400

cycle

modulation

Tuning

gang

fully

open.

Output

Meter

across

voice

coil.

T110,

1107,

1104,

T103

Adjust

for

maximum.

Repeat

until

no

further

improvement

can

be

made.

I,

TC105

Adjust

for

maximum.

600KC

,

'

L107

Rock

tuning

gang

and

adjust

for

maximum.

Repeat

steps

2

and

3

until no

further

improvement

can

be

made.

FM

IF

ALIGNMENT

USING

AM

SIGNAL

GENERATOR—

SELECTOR

IN

FM

POSITION

High

side

of

generator

thru .

001mfd

to

junction

of

C110

and

C111,

low

side

to

ground.

GENERATOR

FREQUENCY

RADIO

DIAL

SETTING

INDICATOR

ADJUST

REMARKS

_

10.7MC

Unmodulated

Point

of

non-

interference

DC

probe

of

VTVM

to

junction

of

VR101

and

C145,common

to

ground

T111,

1109,

1106,

T105,

1102,

T101

10.7MC

Adjust

for

maximum.

FIG.1

DC

probe

of

VTVM

to

junction

of

R132

and

R133,common

to

ground

T112

Adjust

for

zero

reading. A

positive

or

negative

reading

will be

obtained

on

either

side

of

the

correct

setting.

FM

IF

ALIGNMENT

USING

FM

SIGNAL

GENERATOR—

SELECTOR

IN

FM

POSITION

High

side

of

generator

thru .

001mfd

to

junction of

C110

and

C111,

low

side

to

ground.

Use

only enough

marker

signal

for

indication.

Use 60

cycle

frequency

modulated

signal

with

450KC

sweep.

Use

60

cycle

sawtooth

voltage

in

scope

for

horizontal

deflection.

GENERATOR

RADIO

DIAL

FREQUENCY

SETTNG

INDICATOR

ADJUST

REMARKS

10.7MC

Point

of

non-

Vert,

amp of scope

1111,

Disconnect

stabilizing

450KC

Sweep

interference

to

junction of

VR101

1109,

capacitor

c147.

Adjust

for

and

C145,

low

side

1106,

maximum

gain

and

symmetry

to

ground.

1105,

of

response

similar

to

Fig.1

1102,

with

marker

as

shown.

1101

Reconnect

C147.

Vert,

amp

of

scope

to

junction

of

R132

and

R133,

low

side

to

ground.

1112

Adjust

1112

Secondary

to

place

marker

at

center

of

"S"

curve

similar

to

Fig.

2.

Readjust

1111

Primary

for

maximum

amplitude

and

straightness

of

line.

23

FM

RF

ALIGNMENT—

SELECTOR

IN

FM

POSITION

6.

7.

8.

9.

10.

11.

Connect

generator

across

antenna

terminals

with

120-

ohm

carbon

resistor

in

series

with

each

lead.

GENERATOR

FREQUENCY

RADIO

DIAL

SETTING

INDICATOR

ADJUST

10.7MC

REMARKS

\f i

108.5MC

High

freq.

end

DC

probe

of

VTVM

to

junction

of VR101

and

C145,common

to

ground

C108,

TC101,

TC105

Adjust

for

maximum.

FIG.2

90MC

Unmodulated

Tune

to

signal.

L101

Rock

tuning

and

adjust

for

maximum.

Repeat

steps

7

and

8

until

no

further

im-

provement

can

be

made.

FM

STEREO

MULTIPLEX

ALIGNMENT

USING

FM

STEREO

SIGNAL

GENERATOR

High

side of

generator

thru

47K

to

point

e

,

low

side

to

ground.

GENERATOR

FREQUEMCY

INDICATOR

ADJUST

REMARKS

191.0

Vert,

amp

of

scope

thru

47K

to

junct

of

R310

and

T302,

low

side

to

ground.

T301

Adjust

for

maximum.

Vert,

amp of scope thru 47K

to

junct

of

D303 and

D304,

low

side

to

ground.

1302

Adjust

for

maximum

38KC

response.

Modulated

Left

Channel

Vert,

amp

of

scope

to

point4,

low

side

to

ground.

1304,

T311

Adjust

for

MINIMUM.

This

step

should

require

only

slight

adjustment.

Modulated

Right

Channel

Vert.

amp

of scope

to

point

e

low

side

to

ground

1303

Check

for

MINIMUM.

If

necessary

make

compromise

adjustment

of

1311.

SEMICONDUCTORS

ITEM

PART

NO.*

0101

0102

0103

0104

0105

D106

D107

0108

0110

0301

0302

0303

0304

0305

0306

0307

0501

0502

0503

0504

0505

0506

0507

0101

Q102

0103

Q104

Q105

0106

Q107

0301

Q302

Q303

0304

Q501

0502

Q503

0504

Q505

0506

Q507

EA2502/EA16X27

EA2503/EA16X28

EA2502/EA16X27

EA2501/EA16X34

EA2499/EA16X33

EA2500/EA16X6

EA2812/EA15X130

EA2495/EA15X131

EA2493/EA15X132

EA2491/EA15X133

EA2496/EA15X134

EA2494/EA15X135

EA2497/EA15X140

EA2498/EA15X141

EA2770(N)/EA15X137

EA2489/EA15X136

EA2490/EA15X153

EA2488/EA15X160

ELECTROLYTIMARIABUECAPS

ITEM

PART

NO.

C107

C147

C149

C150

C301

C306

C320

C411

C512

C521

C522

C525

C526

C527

C528

C529

C530

C535

C536

C537

C538

C539

C540

C543

C544

C545

C546

C547

EA2522/EA18X137

EA2523/EA31X132

EA2509/EA31X124

EA2551/EA31X154

EA2552/EA31X153

EA2550/EA31X146

EA2509/EA31X124

EA2510/EA31X150

EA2509/EA31X124

EA2508/EA31X151

EA2511/EA31X149

EA2774(N)/EA31X165(n)

EA2511/EA31X149

EA2506/EA31X152

EA2775(N)/EA31X166(N)

EA2774(N)/EA31X165(N)

EA2777(N)/EA31X168(N)

EA2506/EA31X152

VALUE

lmfd

lOmfd

220mfd

.47mfd

3.3mfd

lmfd

220mfd

4.7mfd

220mfd

100mfd

470mfd

220mfd

470mfd

1000mfd

470mfd

220mfd

.22mfd

1000mfd

15V

25V

15V

16V

10V

16V

25V

35V

25V

16V

35V

CONTROLS/SPECIALRESISTORS

ITEM

PART NO.*

DESCRIPTION

VR301

VR501

VR502

VR505 &

VR506

EA2779(N)/EA49X144

EA2780/EA49X143

EA2781/EA49X165

EA2782/EA49X142

EA2783/EA49X168(N)

Treble

Volume

24

General

Electric

A505g

I

h,

C172g,

C460g,

C467g

I

h,

G270g,

G504g

h,

G507g,

P774g,

P775g (

Ch.

PK170)

COILS/TRANSFORMERS

ITEM PART

NO.*

L101

EA2576/EA61X54

1102

EA2564/EA61X55

L103

EA2578/EA61X56

L104

EA2577/EA61X72

L106

EA2578/EA61X56

L107

EA2579/EA61X59

1101

EA2566/EA61X73

1102

EA2568/EA61X76

7103

EA2571/EA61X47

7104

EA2572/EA61X49

7105

EA2568/EA61X76

7106

EA2568/EA61X76

7107

EA2568/EA61X76

7108

EA2568/EA61X76

1109

EA2573/EA61X78

T110

EA2574/EA61X51

T111

EA2569/EA61X52

1112

EA2570/EA61X77

T301

EA2582/EA61X79

1302

EA2580/EA61X70

1304

EA258'./EA61X71

T401

EA2565/EA61X73

1501

EA2505/EA61X73

Power

EA2565/EA61X74

AM

Ant.

EA3107

MISCELLANEOUS

NAME

(MODEL

A505g)

Assembly,

Record

Changer

Cartridge,

Phono

Needle,

Phono

Speaker,

6"

Woofer

Speaker,

3"

Tweeter

(MODELS

A505h,

G504h)

Assembly,

Record

Changer

Cartridge,

Phono

Needle,

Phono

Speaker,

6"

Woofer

Speaker,

3"

Tweeter

Speaker,

3KC

Horn

(MODEL

Cl

72g)

Assembly,

Record

Changer

Cartridge,

Phono

Needle,

Phono

Speaker,

6"

Woofer

Speaker,

3"

Tweeter

Speaker,

3KC

Horn

(MODEL C460g)

Assembly,

Record

Changer

Cartridge,

Phono

Needle,

Phono

Speaker,

6"

Woofer

Speaker,

3"

Tweeter

(MODEL

G270g)

Assembly,

Record

Cartridge,

Phono

Needle,

Phono

Speaker,

6"

Woofer

Speaker,

3"

Tweeter

(MODELS

C467g,

C467h)

Assembly,

Record

Changer

Cartridge,

Phono

Needle,

Phono

Speaker,

6"

Woofer

Speaker,

3"

Tweeter

(MODELS

G504g,

G5070

Assembly,

Record

Changer

Cartridge,

Phono

Needle,

Stylus

Speaker,

6"

Woofer

Speaker,

3"

Tweeter

Speaker,

3KC

Horn

PART

NO,

RD630-2

EA80X234

EA80X235

EA95X63

EA95X59

RD730-2

EA80X234

EA80X235

EA95X63

EA95X59

EA95X56

RD630-4

EA80X234

EA80X235

EA95X63

EA95X59

EA95X56

RD630-3

EA80X234

EA80X235

EA95X63

EA95X45

Changer

RD730-2

EA80X234

EA80X235

EA95X63

EA95X45

R0730-1

EA1013/EA80X234

EA1014/EA80X235

EA8090/EA95X63

EA8089/EA95X45

RD630-2

EA80X234

EA80X235

EA95X63

EA95X59

EA95X56

(MODEL

P774g)

Assembly,

Record

Changer

Cartridge,

Phono

Needle,

Phono

Speaker,

6-1/2"

(MODEL

P775g)

Assembly,

Record

Changer

Cartridge,

Phono

Needle,

Phono

Speaker,

6"

Woofer

Speaker,

3"

Tweeter

CABINET

PARTS

NAME

RD730-4

EA1013

EA1014

EA2935

RD630-4

EA1013

EA1014

EA8468

EA8048

PART

NO.*

(COMMON)

Escutcheon,

Front (

All

EA2453/EA89X147

models

except

G270g)

Inlay,

Aluminum (

All

models

EA2455/EA4X294

except

G270g)

Window, Plastic

EA2454/EA4X293

Knob,

Control

EA2461/EA43X185

Knob,

Tuning

EA2462/EA43X186

(MODEL

A505h)

Enclosure,

Speaker,

Right

EA99X220-n

Enclosure,

Speaker,

Left

EA99X221-n

(MODEL

C1720

Top,

Cabinet EA96842

Bottom,

Cabinet

EA96X843

Cabinet,

Speaker EA96X665

Cover, Dust

EA96X839

(MODEL

C460g)

Cabinet,

Tuner/Amp

Cabinet,

Speaker

Cabinet,

Changer

Cover, Dust

(MODEL

C467g)

Assembly,

Main

Cabinet

Assembly,

Speaker Cabinet

Assembly,

Changer Cabinet

Cover,

Dust

(MODEL

C467h)

Assembly,

Main

Cabinet

Assembly,

Speaker Cabinet

Assembly,

Changer

Cabinet

Cover,

Dust

(MODEL

G270q)

Enclosure,

Right

Speaker

Enclosure,

Left

Speaker

Escutcheon,

Control

Inlay,

Aluminum

Glass,

Dial

EA99X213

EA99X202

EA99X201

EA96X749

EA8785/EA99X213

EA8463/EA99X202

EA8556/EA99X201

EA8321/EA96X749

EA8819/EA99X234

EA8463/EA99X202

EA8556/EA99X201

EA8321/EA96X749

EA99X227-n

EA99X228-n

EA89X164-n

EA4X334-n

EA4X335-n

(MODEL

G504h)

Enclosure, Right

Speaker

EA99X222-n

Enclosure,

Left

Speaker EA99X223-n

(MODEL P774g)

Assembly,

Cabinet

Cover,

Dust

Enclosure,

Speaker

(MODEL P775g)

Top,

Cabinet

Bottom,

Cabinet

Cabinet,

Speaker

Cover,

Dust

EA8776

EA8625

EA8724

EA8622

EA8623

EA8463

EA8625

*

GE

Major

Appliance

Distributor

Part

Number/GE

Service

Facility

Part

Number

25

cno

30P

0,

TC101

L101

VC101

1

QI01

C101

2SC535

3P

ov

C102

F

m

ANT

10P

o'

FM

B

O

R

0:m

910

RI81

8212

II

DI02

IN60

R101

56K

LI06 R102

100K

QI05

2SC460

-L9

C109

r

0102

VCIO2

TC102

•

3P

2SC461

uv

1_102

1

C104

02

R104

1K

RII7

RI73

100

22

- 9.

3V

C122

04

AN't_.

I

RI

44

120

C158

04

I

2K

.

19

RI75

9116

560

C126

04

R109

68K

011

3

2SC46

•

RII8

RII9

.6805.

56

K

RI

11

68

-u

IN60

-6

CII3

C114 •

22P

1101

CI21

I2P

VC

103

10110

151923

uv

â -

1

-C118

5P

L104

rd

TC

IOT

Çc2o

II

•

RII3

04

R122

121

220

5

C

3

-

11A0V

.

1•1

CI27 R120

04

27K

CI28

005

4C107

1102

1109

0105 1N60

CI35

0047

CI

34

04

RI24

c136

47K

0047

RI23

470

-

tsc150

+

220,16v

77

2S83541

A

0107

2SC460

CI46

-2.2v

CI60

L107

‘L—

C-

59

350P

1103 1104

R141

330

Voltages

shown

were

taken

in

FM

with

an

off the

air

signal

except

for

Q104

which

is

operative

only

in

AM.

A

100K

ohm

per

volt

meter

was

used

9131 120

C141

04

RI30

5

6K

T111

1112

R143

47K

C149

C138

1500P

0108

IN60

0107

1

2K

IN60

CI46

200P

C 162

04

IF—

C139

3P

R

34

R

2K

R132

330

9133

390K

--

C142

•

70P

u.

C144

R171 04

390K

R147

10K

\/\/\/\/

RI29

56K

11

AFC

13

0

AFCC

)

14

RI15

390K

FM

OUT()

16 -

AM

OuT(`

-

'

17

18

Sams MHF-37 User manual

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