Zenith 28t925 User manual

PHOTO

FACT*

Folder

ZENITH

MODELS

28T925,

28T96O,

28T961,

28T962,

28T963

VERT.

CENT.

CHANNEL

SELECTOR

FINE

TUNING

VERT.HOLD

FOCUS

HORIZ.

CENT.

DIAL

LIGHT

5W,

HORiZ.

DRIVE

CONTRAST

CONTROL

VOL.CONT.

ON-OFF

SW,

BRIGHTNESS

HORIZ.

PHASE

HORIZ.

HOLD

VERT.LIN,

HEIGHT

WIDTH

ZENITHMODEL

28T960

.TRADE

NAMEZenith,Models

28T925,

28T960,

28T961,

28T962,

28T963.

Chassis

28F20,

28F20Z,

28F21,

28F22.

MANUFACTURER

ZenithRadio

Corp.,

6001

Dickens

Ave.,

Chicago,

Illinois

TYPE

SET

Television

Receiver

TUBESTwenty-eight

POWER

SUPPLY

117

Volts,

60

Cycle

AC

TUNINGRANGEChannels

2

through

13

RATING

3.11

Amps

@ 117

Volts

AGO

Adjustment

AlignmentInstructions

BlockDiagram

Horizontal

Frequency

Adjustment

HorizontalPhaseAdjustment

Parts

List

and

Description

Photographs

Capacitor

Identification

Chassis-Top

View

INDEX

20

Photographs(continued)

6,7

10

20

14,15,16,17

5,8

PowerSupplyChassis

RF

Tuner

Resistor

Identification

Trans.,

Inductor

and

Alignment

Identification

Schematic

Tube

PlacementChart

Voltage

and

ResistanceMeasurements

19

10

11,18

4,9

2

12

13

HOWARD

W.

SAMS

&

CO.,INC.

.

Indianapolis

7,

Indiana

"The

listing

ofany

available

replacement

part

herein

does

not

constitute

inany

case

a

recommendation,

warranty

or

guaranty

by

Howard

W.

Sams

&

Co.,

Inc.,

as

tothe

quality

and

suitability

of

such

replacement

part.

The

numbers

of

these

parts

have

been

compiled

from

information

furnished

to

Howard

W.

Sams

&

Co.,

Inc.,

bythe

manufacturers

ofthe

particular

type

of

replacement

part

listed."

"Reproduction

or

use,withoutexpresspermission,

of

editorial

or

pictorial

con-

tent,

inany

manner,

is

prohibited.

No

patent

liability

is

assumed

with

respect

to

the

useofthe

information

containedherein.

Copyright

1949

by

Howard

W.

Sams

&

Co.,

Inc.,

Indianapolis

7,

Indiana,

U.

S.of

America.

Copyright

under

In-

ternational

Copyright

Union.

All

rightsreservedunderInter-American

Copyright

Union

(1910)

by

Howard

W.

Sams

8,

Co.,Inc."

Printed

inU.S.of

America

DATE

6/49

4912-15

SET#64

FOLDER

15

to

oo

>O

O

N

Om

to

±1

B7~ra

ib.

rh;

A

PHOTOFACT

STANDARD

NOTATION

SCHEMATIC

©

Howard

W.

Soms

&

Co.,

Inc.

1949

PAGE

2

THE

COOPERATION

OFTHE

MANUFACTURER

OF

THIS

RECEIVER

MAKES

IT

POSSIBLE

TO

BRING

YOU

THIS

SERVICE

ANTENNA

ADJ.

CHASSIS

TOP

VIEW

C9618Z

'Z96L9Z

'196JL8S

'O9618S

S13QOW

H1IN3Z

CHASSIS

BOTTOM

VIEW-TRANS.,

INDUC

PAGE

4

JCTOR

AND

ALIGNMENT

IDENTIFICATION

PAGE

9

IVO-AOA

wonoa

SISSVHO

9

39Vd

CAPACITOR

IDENTIFICATION

PAGE

5

ALIGNMENTINSTRUCTIONS

VIDEO

IF

ALIGNMENT

Connect

a

-1.5

volt

bias

battery

to

AGO

line.Remove

theAGO

tube

(V8)

and

connect

the

negative

side

ofthe

bias

battery

to

testjack

"0"andthe

.positive

side

to

chassis.

Connect

the

synchronizedsweep

voltage

from

the

signalgenerator

tothe

oscilloscope horizontalamplifierInput

for

horizontaldeflection.

Remove

the

oscillatortube

(V3)

during

the

video

IF

alignment.

To

disable

the

high

voltageremove

the

horizontaloscillatortube

(V22)

from

its

socket.

DUMMY

ANTENNA

500MMF

Direct

SWEEP

GENERATOR

COUPLING

High

side

to

1

(Grid)

of

6AH6

(V6)

..ow

side

to

chassis

High

side

to

1

[Grid)

of

6AU6

(V5)

jOW

side

to

chassis

-Ilgh

side

topin1

(Grid)

of

6AU6

(V4)

Low

side

to

chassis

Ilgh

side

toan

ungroundedtube

shield

slippedover

the

convertertube.

Low

side

to

chassis

SWEEP

GENERATOR

FREQUENCY

24MC

(10MC

Sweep)

MARKER

GENERATOR

FREQUENCY

21

.-6MC

25.9MS

25.

SMC

22.2MC

25.

IMC

27.

SMC

21.

SMC

21.

SMC

22.

SMC

25.

IMC

25.

SMC

27.

SMC

CHANNEL

Any

"

n

CONNECT

SCOPE

Vert.

Amp.

thru

100KS2

to

test

Jack

"S"

.

Low

side

to

chassis.

ADJUST

Al,

A2

A3

A4

AS

A7,A8

A9,A10

REMARKS

Adjust

AlandA2to

obtainpattern

as

perFig1

withpeaksbeing

of

equalamplitude

andthe

21.6MC

marker

properlyplaced

onthe

pat-

tern.Adjust

A3to

place

25.9MC

marker

atthe

high

freq.

peak.

Check

position

of

21.

SMC

marker.

If

necessaryrepeatadjustment

of

Al,

A2andA3.

Reduce

sweepgeneratoroutput

until

amplitude

is

approximatelysame

as

thatobtained

in

step

1.

Adjust

A4

for

pattern

and

placement

of

25.

SMC

marker

asper

Fig

Z.

Adjust

for

pattern

and

placement

of

22.2MC

marker

asper

Fig

3.The

25.

IMC

shouldfallapproximately

as

shown

in

Fig

3.

Use

maximummarker

amplitude

and

adjusttrap

ASso

27.

SMC

marker

disappears

at

"notch"

asper

Fig

3.

Adjusttraps

A7and

AS

for

minimum

indication

of

21.

SMC

marker

asper

Fig

4.

Adjust

A9andA10

alternately

for

reasonably

flat

topped

pattern

as

per

Fig4.

Checkmarkers

tosee

that

theyaopear

at

proper

points

on

the

pattern.

The

K.

SMC

marker

is

located

at

50%

onthe

high

freq.

slope

side

ofthe

overall

video

IF

pattern

(Fig

4)

.

SOUND

IF

ALIGNMENT

The

sound

IF

transformers

used

in

thisreceiver

have

specially

designed

slug's

and

require

a

special

alignment

tool.

(Zenith

Part

No.

68-7).

Bothslugs

of

eachtransformer

are

accessiblefrom

the

hole

inthetopofthe

trans-

former.

The

alignmentwrench

is

partiallyinserted

to

align

thetop

winding

and

fullyinserted

to

adjust

the

slug

forthe

bottom

winding.

DUMMY

ANTENNA

500MMF

500MHF

SWEEP

GENERATOR

COUPLING

Ugh

side

topin1

(Grid)

of

6AU6

(V13)

.,ow

side

to

chassis.

-ligh

side

topin1

(Grid)

of

6AU6

(Via;

Low

s

ide

to

chassis.

•liEh

side

topin1

(Grid)

of

6AUS

(Vli;

Low

side

to

chassis.

Ilgh

side

toan

ungrounded

tube

shield

placedover

the

mixertube

(V3).

Low

side

to

chassis

.

SWEEP

GENERATOR

FREQUENCY

24MC

(IMC

Sweep)

"

n

MARKER

GENERATOR

FREQUENCY

21.

SMC

"

CHANNEL

Any

•

"

CONNECT

SCOPE

Vert,

&mp.

to

Polnt^N

Low

side

to

chassis.

Vert.

Amp.

to

Point-op

Low

side

to

chassis

.

"

ADJUST

All,

A

12

A13,

A14

A15,

A16

A17

REMARKS

Adjust

AllandA12for

maximum

amplitude

and

symmetry

asper

Fig

5

with

21.

SMC

marker

at

center.

The

peak

to

peakdiscriminatorwidth

is

approximately

450KC.

Adjust

for

maximumamplitude

and

symmetry

asperFig6.

"

3.

7.

10.

FIG.

3

PAGE

6

OSCILLATOR

ALIGNMENT

12.

14.

15.

16.

17.

The

trimmer

X

located

In

the

plate

circuit

of

theRF

Amp.

Is

Tor

compensation

of

Interelectrode

capacity

ofthe

tube

and

capacity

ofthe

circuit

wiring

and

Is

pre-set

atthe

factory.

Donot

adjust

In

field

unless

proper

equipment

Is

available.

It

Is

suggested

that

the

oscillator

circuits

be

checKed

beforeattemptingalignment

to

determine

if

adjustment

Is

actually

necessary.

This

is

done

by

connecting

the

signal

generator

and

VTVM

as

outlined

below

in

step

11.Setthe

signal

generator

tothe

sound

carrier

frequency

ofthe

channel

being

checked

and

turn

the

finetuning

control.

The

VTVM

will

indicate

both

a

positive

and

negativepeak

asthe

fine

tuning

control

passes

throughresonance.

The

properadjustment

is

the

zeropointbetween

thetwo

peaks.

Ifthe

zero

point

cannont

be

obtained,alignment

of

the

oscillator

circuits

should

be

performed

inthe

order

g

iven

starting

with

step

11.The

oscillator

adjustments

are

made

by

depressing

knob

atthe

front

endofthe

tuner

except

forA18andA25

which

are

shown

in

side

view

photograph

of

the

tuner

.

DUMMY

ANTENNA

Two

150S

carbon

res

.

Two

150S

carbon

res.

M

SIGNAL

GENERATOR

COUPLING

Across

Antenna

terminals

with

150S2

resistor

in

each

lead.

tf

SIGNAL

GENERATOR

FREQUENCY

197.75MC

179.75MC

185.75MC

191.75MC

203.75MC

209.75MC

215.75MC

71.25MC

59.75MC

65.75MC

81.75MC

87.75MC

CHANNEL

10

7

8

9

11

12

13

4

2

3

5

6

CONNECT

VTVM

1C

Probe

to

Point

u

Common

to

chas-

fis.

"

ADJUST

A18

A

19

A20

A21

A22

ASS

A24

A25

A26

A27

A28

A29

REMARKS

Pre-set

the

fine

tuning

control

so

that

the

widest

area

ofthe

eccentric

tuning

slugs

points

upward.

Insert

a

pointed

tool

thru

one

ofthe

adjustment

slots

and

turn

A18

(air

trimmer

disc.)

until

zero

point

between

the

positive

and

negativepeaks

is

obtained.

Pre-set

fine

tuning

as

above

and

adjust

A19

thru

A24

for

zeroreading

at

t

heir

respec-

tive

channels.

Pre-set

fine

tuning

control

as

above

and

adjust

slug

A25for

zero

reading.

Pre-set

finetuningcontrol

as

above

and

adjust

A26

thru

A29at

their

respective

channels.

ANTENNA

ALIGNMENT

Remove

the

AGO

tube(V8)

and

connect

-1.5

volt

bias

battery

from

test

Jack

"C"

to

chassis.

The

antennaadjustments

are

accessible

throughhole

In

rear

ofthe

tuner.

DUMMY

ANTENNA

Pwo

1502

carbon

res.

fwo

1502

carbon

res.

SWEEP

GENERATOR

COUPLING

\cross

Antenna

ter-

ninals

with

1502

resistor

in

each

Lead.

n

SWEEP

GENERATOR

FREQUENCY

213HC

(10MC

Sweep

)

207MO

(10MC

Sweep)

201MC

(10MC

Sweep)

195MO

(10MC

Sweep)

189MC

(10MC

Sweep)

183M2

(10MC

Sweep)

177MC

(10MC

Sweep)

85M3

(10MC

Sweep)

79MC

(10MC

Sweeb)

69MC

(IONS

Sween

J

63MC

(10N3

Sweep

)

57M3

(lore

Sweep)

MARKER

GENERATOR

FREQUENCY

211.25MC

315.75MD

205.25tC

209.75M2

!&9.25rK

203.75MC

193.25MC

197.75MC

187.

251*

1&1.75MD

181.25M3

185.75MC

175.25MC

179.751*

83.251*

87.75MC

77.25M3

a\7y>K

67.

25

He

71.751*

65.251*

65.75MC

55.251*

59.75MC

CHANNEL

13

12

11

10

9

8

7

6

5

4

3

2

CONNECT

SCOPE

Vert.Amp.

to

test

Jack

"S".

Low

s ideto

chassis

(If

scope

isnot

calibratec

use

VTVM

and

attenuate

sweep

generator

to

give

1.5to2

volt

reading.

IMPORTANT:

All

otheradjustments

inthe

tuner

are

Pre-Set

att he

ADJUST

A30

A31

A32

A33

A34

A35

A36

A37

A38

A39

A40

A41

REMARKS

Keep

sweep

generator

attenuated

so

scope

pattern

does

not

exceed

3

volts

peak

to

peak.

Adjusttrimmer

for

maximum

amplitude

and

symmetry

asperFig7.

Check

tosee

that

markersappear

at

properpoints

on

the

pattern.

factory

and

should

notbe

adjusted

in

the

field.

4.

SMC

TRAPADJUSTMENT

Adjustment

of

this

trap

is

usually

not

necessary

unless

the

unit

has

been

tamperedwith

ora

component

replaced.

DUMMY

ANTENNA

5000MMF1

SIGNAL

GENERATOR

COUPLING

High

side

to

7

Grid)

of

12AT7

V7).

Low

side

to

chassis.

SIGNAL

GENERATOR

FREQUENCY

4.

SMC

(Set

very

accur-

ately)

CHANNEL

Any

t

CONNECT

RF-VTVM

IF

Probe

to

Plc-

ure

tube

grid

2 of

V28)

.

ommon

to

chassis.

ADJUST

A42

REMARKS

Turn

contrast

control

to

give

1

volt

read-

ingon

RF-VTVM.

Adjust

A42

for

minimum

indication.

to

00

>o

O>

N

PS

M

5

00

X

3

5

£

oo

Kd

-I

>

o

to

M

CO"

FIG.

5

FIG.

6

FIG.

7

PAGE

7

RFAMR

MIXER

ST

SOUND

IF

V

11

I

2ND

SOUND

IFVI2J

LIMITER

VI31

K

B|

DISCRIMINATOR

•

_

i^VWBT

AFAMR

V2VI4

AUDIO

OUTPUT

VIS

0-

ST

VIDEO

IF

V4

k

2ND

VIDEO

IF

V5

•

^

3RD

VIDEO

IF

V6

||

AGC

V26

•

^

V27

•

1ST

AGCAMR

'/2V8

fc

2ND

AGC

AMP,

V2V9H

B-

VIDEO

DET.

1/2

V7

H

1ST

VIDEO

AMR

l^VyH

~

1ST

SYNC.

CUPPER

•

>/2V8

•

SYNC.AMP.

VI6

1

SYNC.

CLIPPER

VI?

fc

SYNC.SEP.

'&V9

•

15.75

KC

J

HOR.

SYNC

DISC.

V20fc

HOR.

ATC

CONTROL

E

-

.^—-,^^^—^^LM

HOR.

OSC.

V22

k

HOR.

DISCH.

V2VI8

I

BLOCK

DIAGRAM

RF

TUNER-LEFT

SIDE

PAGE

10

CHASSIS

BOTTOM

VIEW-RE:

PAGE

18

™(Ril3)(R7i)(R]2)(R73)(R118

RESISTOR

IDENTIFICATION

PAGE

1ST

SOUND

IF2ND

SOUND

IF

LIMITERDISC.

AF

AMP

AUDIO

OUTPUT

VI3N

OO

_O

OS*

x

'

'rST

•J

AUDIO

OUTPUT

OISC.AF

AMP

LIMITER-

2ND

SOUND

IF

1ST

SOUND

IF

HOR.

A/2(J*

HOR.

AFC

CONTROL

DISC"'

^AL7

i^~\V

RECT/V^N

X X

x-—

--->/_

k*Cl)

HOR.OSC.

M'V-

RECT'(lB3GTJ

OAMPER/V24\

L_

~^r

/v2\

-'

(SVAGT)

cp

,„

UBGT)

X^N

V_y

/

^T

WV6GTJVERT

OUTPUT

/

"

-.

AMB^VERT.

osc.

/

v

23

\.

HOR.

OUTPUT

UBG6G

I

\M

\W

n

nn

^

^i

PICTURETUBE

v_yv_yv_y

/yioV_iii

/

1

SYN&SEFX/^SLT)

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x

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CLIPPER

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.

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1ST

AGC

AMP.

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]

-'

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^^r

-'

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'

=©"o o

OL

VIDEO

DET.

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,

IST

VIDEO

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(^^

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3RD

VIDEO

2NDVIDEO

ISTVlDtd

'

^

'

L.

\6AC77

•"

2ND

VIDEO

AMP.

r

i

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ii

I

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:

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M'lXER

RFAMP.

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.

---

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J

TUBEPLACEMENTCHART

VOLTAGE

AND

RESISTANCE

MEASUREMENTS

VOLTAGE

READINGS

RESISTANCE

READINGS

Item

V1

V

2

V

3

V4

V5

V

6

V7

V

8

V9

V

10

V

11

V12

V13

V

14

V15

V16

V17

V

18

V

19

V20

V21

V22

V23

V

24

V25

V26

V27

V2BB

Tub*

6AG5

6A05

6J6

6AU6

6AH6

12AT7

6SL7GT

6AC7

6AU6

6AII6

6AU6

6T8

6V6GT

6AU6

6SH7

6SN7GT

6V6GT

6AL5

6AC7

6K6GT-G

6BG6G

5V4G

1B3GT

5U4G

12KP4

1

-5.8VDC

-1.6VDC

120VDC

-.2VDC

0V

-.SVDC

140VDC

.2VDC

0V

-.7VDC

-.5VDC

0V

-.6VDC

0V

-10VDO

0V

-2.6VDC

0V

OV

0V

2

.7VDC

.8VDO

4-95VDC

0V

-.6VDC

-.2VDC

-.1VDC

0V

-.5VDC

6.3VAC

0V

140VDC

300VDC

0V

-9VDC

0V

ov

6.3VAC

480VDC

tDONOT

0V

*215VDC

340VDC

430VDC

205VDC

3

6.3VAC

OV

2.

3V

DC

2.

SVDC

OV

6.3VAC

4.6VDC

200VDC

OV

330VDC

OV

160VDC

14VDC

OV

4

OV

6.3VAC

-2.2VDC

-.4VDC

OV

225VDC

6

.3

VAC

-.8VDC

-20VDC

330VDC

6.3VAC

-.9VDC

180VDC

6.3VAC

400VDC

5

195VDC

19SVDC

•t-5

-4.2VDC

200VDC

175VDC

200VDC

OV

S.3VAC

185VDC

OV

135VDO

135VDC

55VDC

6.3VAC

OV

55VDC

OV

36VDC

OV

-1.2VDC

OV

-18VDC

1VDC

OV

6

115VDC

5SVDC

5-5VDC

140VDC

135VDC

95VDC

SOVDC

OV

SOVDC

135VDC

S5VDC

OV

135VDC

OV

90VDC

400VDC

1VDC

400VDC

7

.TV

DC

.8VDC

OV

.6VDC

1.4VDC

-.SVDC

-.5VDC

6.3VAC

.8VDC

OV

6.3VAC

OV

6.3VAC

-8.

SVDC

6.3VAC

OV

8

OV

190VDC

-.SVDC

9.

SVDC

100VDC

6.3VAC

atjvuu

42VDC

220VDC

.4VDC

270VDC

480VDC

9

6.3VAC

OV

75VDC

TOPCAP

t

«ASURE

OV

10

390VDC

320VAC

390VAC

11

215VDC

OV

300VDC

1£

«215VDC

320VAC

390VAC

OV

340VDC

430VDC

Measurementstaken

on

channel

4

unlessotherwisestated

T

Donot

measure

§

Taken

with

vacuumtubevoltmeter

*

6.3VAC

measuredbetweenfilamentpins

4-

Measured

on

channel

10

item

V

1

V2

V

3

V

4

V

5

V

6

V

7

V

8

V9

V

10

V1 1

V

12

V13

V14

V

15

V

16

V17

V18

V

19

V20

V21

V22

V23

V24

V25

V26

V27

V28B

Tube

6AG5

6A05

6J6

6A1I6

6AII6

BAHfi

12AT7

124T7

6ST.7fiT

6AH7

6A1IK

fiallfi

6A1I6

BTR

BVfir.T

6AII6

6SH7

6SN7fiT

fiVfiOT

6AI.5

6AC7

6K6QT-Q

6BG6G

SV4G

1BSGT

5U4G

12KP4

Pin1

2.5

Mee.

3.5

Mee.

«6K2

]

.5

Meg.

1.5

Meg.

.22

4K2

*2.8K2

3002

OB

.la

.12

100K2

150KS2

on

1

Mee.

OS

2.8

Mee.

OS.

7.5K2

oa

Inf.

inf.

Inf.

BQKffi

2

4?a

820SJ

*IOKB

on

oa

Offl

4KB

32KSZ

1.3Meg

Offl

oa

Offl

150K2

.2a

oa

02

»*2.2Meg

»»90K2

oa

470KS

oa

Offl

.2ffl

**14Kffl

Inf.

6Kffl

20KS2

»*9K2

3

.22

.2ffl

.28

.22

.Iffl

2.2K2

oa

.22

250K2

*1200a

02

**3Kffi

02

Offl

»*8K2

1502

Inf.

10

»»130S

4

02

oa

02

Offl

.22

600K2

1

Mee.

02

oa

02

.520.0

.22

850K2

220K2

**3K2

.22

1.4MRO-.

*«13KS>

.22

««ieoa

Inf.

202

22ffi

11

120K2

5

»2K2

ISOOffl

*

15002

*6K2

2K2

Offl

.2ffl

*20KB

Offl

*7.5Ka

»7.5Ka

»47Kffl

.22

™Ka

*20KE

02

**580Kffl

4.7

Meff.

1

Mfig.

102

70K2

500K2

Inf.

6K2

12

80K2

6

*24K2

*550K2

47K2

*3K2

»3K2

*36K2

*12Kffl

«18K2

02

*8.5Kffl

»7.5K2

*7.5KG

»47Kffl

Offl

242

•2.8K2

02

Inf.

02

»«26Kffi

22K2

SOOKffl

*t!602

Inf.

202

22S

7

47ffl

8202

oa

822

1502

1

Mee.

1

Mee.

.22

682

6?a

Offl

02

oa

.22

Offl

.2a

470K2

.2a

.2B

Offl

Inf.

inf.

Inf.

8

02

»»9KB

15

MeE.

2202

»15K8

.2ffl

6.5K2

15002

**23KS

152

»*10K2

*«14K2

Inf.

6Kffi

20K2

9

.22

02

*220K2

TOPCAP

»*15Kffl

TOPCAP

**15Kffl

*

Measured

from

pin8 ofV26

*»

Measured

from

pin8 ofV27

1.

DC

Voltagemeasurements

are

at

20,000

ohms

per

volt;

AC

Voltage

measured

at

1,000

ohms.

2.Pin

numbers

are

counted

ina

clockwise

direc-

tion

on

bottom

of

socket.

3.

Measured

values

are

from

socket

pinto

com-

mon

negative

unless

otherwise

stated.

4.

Line

voltagemaintained

at

117

volts

for

volt-

age

readings.

5.

Front

panels

controls

setat

minimum.

6.

Where

readings

may

varyaccording

tothe

setting

ofthe

service

controls,

bothminimum

and

maximumreadings

are

given.

C9618C

'S9618Z

'L9618Z

'O9618S

'SZ618Z

S13QOW

H1IN3Z

TUBES

(SYLVANIA

or

Equivalent)

PARTS

LIST

ITEM

No.

VI

V2

V3

V4

VE

ve

V7

V8

V9

VI

v:

0

1

2

3

V14

VI

V]

VI

5

6

7

V18

V19

V2

0

1

2

V23

V2

4

5

6

7

V28A

B

C

D

RF

Ml

USE

Amp.

xer

Oscillator

Is

2n

3r

t

Vide

1

Vide

1

Vide

o

IF

o

IF

0

IF

Video

Det.-lst

VI

ieo

Am

D

.

1st

AGO

Amp.-

1s

pe

;

Sync

p

2nd

AGC

.Clip-

Ajnp

.

—

Sync

.

Sep.

2n

Is

2n

LI

1

Vide

t

Soun

i

Soun

niter

Disc.-AF

Au

Syi

2n

pe

31o

0

ic.

Am

1

Sync

r

Vert.Osc

Dl

sen.

o

Amp

.

d

IF

d

IF

Amp.

utput

P.

.

Cllp-

.

-Horlz

Vert.

Output

Ho

Co

Ho

riz.

S

-lz.

A

itrol

"lz.

0

ync.

Disc.

FC

sc.

Horlz.

Output

Dar

HV

LV

nper

Rect.

Picture

Tube

PI

;ture

Tube

Picture

Tube

REPLACEMENT

DATA

ZENITH

PART

No.

6AG5

6A

35

6J6

6A

ia

12

as

U6

H6

4T7

AT7

6SL7GT

6A

07

J6

6T8

6V

6A

6S

SGT

J6

H7

M7GT

6V6GT

6A

6K

L5

n

3GT

6BG6G

5V

IB,

5U

SU

1G

SGT

10

1G

12LP4

121

101

5P4

3P4

10FP4

STANDARD

REPLACEMENT

6AG5

6J6

6AU6

6AH6

12AT7

6SL7GT

6AC7

6AU6

6T8

6V6GT

6AU6

6SH7

6SN7GT

6V6GT

6AL5

6AC7

6K6GT

6BG6G

5V4G

1B3GT

5U4G

12LP4

12KP4

10BP4

10FP4

RMA

BASE

TYPE

7BD

7BF

7BK

8BD

8N

7BK

7AC

7BK

8BK

8BD

7AC

6BT

8N

7S

5BT

5L

3C

5T

NOTES

Used

on

28F20

and

28F20Z

Chassis

n

it

Used

or

nn

"

28F21

"

II

il

N

md

28F22

Chassis

n

CAPACITORS

Capacity

values

given

inthe

rating

column

arein

mfd.

for

Electrolytic

and

Paper

Capacitors,

andin

mmfd.

for

Mica

and

Ceramic

Capacitors.

ITEM

No.

Cl

flQ

RATING

CAP.

15

Af\T

200

REPLACEMENT

DATA

ZENITH

PART

No.

22-1826

AEROVOX

PART

No.

AF3G

CORNELL-

DUBILIER

PART

No.

UP2025

urn

TIT

ERIE

PART

No.

SOLAR

PART

No.

SPRAGUE

PART

No.

TVL-70

IDENTIFICATION

CODES

AND

INSTALLATION

NOTES

Filter

ITEM

No.

C41

042

043

044

045

046

C47

C48

049

050

051

052

053

054

055

056

057

C58

059

060

061

062

063

064

C65

066

067

068

069

C70

071

072

C73

C74

C75

C76

C77

078

079

C80

081

082

083

084

085

086

087

CSS

089

090

091

092

RATING

CAP.

.01

.1

.01

.047

.1

.033

.0012

.0047

25

.005

500

3

.0047

.001

.022

.0047

.047

47

.1

250

.022

.01

.005

.01

.047

.1

.0022

150

470

.015

.0047

.047

.0047

.015

.0047

.047

150

.01

680

.001

.047

.1

500

30

.0047

.047

VOLT

400

200

400

600

400

600

500

600

500

600

200

600

500

200

400

200

400

600

200

400

600

500

400

500

1000

600

2000C

600

REPLA

ZENITH

PART

No.

27-1809

22-1777

22-1809

22-1775

22-1841

22-1901

22-1880

22-1847

22-1887

22-1706

22-1703

22-1693

22-1811

22-1886

22-1813

22-1782

22-1844

22-1674

22-1841

22-182

22-1845

22-1779

22-1842

22-1843

22-1844

22-1841

22-1845

22-1137

22-1138

22-1850

22-1847

22-1778

22-1775

22-1849

22-1850

22-1847

22-1844

22-1137

22-1846

22-1833

22-1851

22-1844

22-1841

22-1832

22-1871

22-1782

.

22-1844

AEROVOX

PART

No.

P4S8-0]

P288-1

P488-01

P488-047

P688-1

P688-033

P688-001

P688-0047

1468-000025

1467-005

1468-0005

P488-0047

1468-001

P688-022

P688-0047

P688-047

1468-00005

P688-1

1468-00025

P688-022

P688-01

P688-005

P688-01

P688-047

P688-1

P688-0022

1468-00015

1468-0005

P288-015

P488-0047

P288-047

P488-047

P688-0047

P288-015

P488-0047

P688-047

1468-00015

P488-01

1479-0007

P1088-001

P688-047

P688-1

P683-U047

P688-047

COR

DUB

PAR1

GT4

GT2

GT4

GT6

5W5

1D5

5W5

GT6

1W5

GT6

5W5

GT6

5W5

GT6!

GT6i

GT6J

GT61

GT6!

GT6S

GT6]

GT61

5W5'.

5W5'

GT6I

GT6]

GT2!

GT4i

GT61

GT6!

GT41

GT6S

5W5'

GT4!

2R5'

GTK

GT6i

GT61

GT6]

5R5>

GT61

GT6i

ITEM

No.

Cl

C2

03A

B

C4A

B

C

C5

C6A

B

C

C7A

B

C

08

C9

CIO

Oil

C12

CIS

C14

CIS

C16

C17

CIS

C19

C20

021

C22

C23

024

C25

026

C27

C28

C29A

B

030

031A

B

032

C33A

B

C34A

B

035

036

037

CSS

039

040

RATING

CAP.

15

40

20

100

20

40

20

10

100

10

40

20

500

20

200

.001

200

.001

200

.001

200

1.2

10

47

46

100

52

6

.001E

200

.001E

200

.001E

7.5

.047

.001

470

.001

VOLT

200

400

475

300

475

300

25

450

350

300

200

50

25

3

25

REPLACEMENT

DATA

ZENITH

PART

No.

22-1826

22-1827

22-1828

22-1836

22-1573

22-1837

22-1838

22-1903

22-1904

22-1903

22-1668

22-1888

22-1668

22-1888

22-1668

22-1888

22-1668

22-1765

22-1895

22-1876

22-1947

22-1870

1

22-1869

400

500

105-17

22-1668

105-17

22-1668

105-17

22-1898

22-1775

27-108

22-1888

22-1138

400

122-1839

AEROVOX

PART

No.

AF3G

AF8J

AF4K20G

AFH14K4G8A

AF8J

AF862J4A*

AFH202E8B

PRS25/25

PRS6/500

PRS25/25

1468-0001

1469-00005

1467-0015

1468-0002

1467-0015

1468-0002

1467-0015

P488-047

1468-0001

1468-0005

P688-001

CORNELL-

DUBILIER

PART

No.

UP2025

UP1111

45t

UP9BJ

1016

UP7CJ

1014

UP4045

UP70J

971

UP70J

1054

BR202A

BRH605

BR202A

5W5T1

5R5Q5

1W5D15

5W5T2

1W5D15

5W5T2

1W5D15

GT4S5

1W5D1

5W5T5

GT6D1

ERIE

PART

No.

GP2K-200

GP2L-001

GP2K-200

GP2L-001

GP2K-200

GP2L-001

GP2K-200

NPOK-10

GP1K-50

GP1K-100

GP2L-0015

GP2K-200

GP2L-0015

GP2K-200

GP2L-0015

GP2L-001

GP2K-500

GP2L-001

SOLAR

PART

No.

MO.

5-31

MOS

.5-45

MW.

5-215

MW.

5-215

MO.

5-32

MW.

5-215

MW.5-215

MO.

5-32

m.

5-215

MW.5-215

ST-4-05

MW.5-21

MO.

5-35

ST-4-001

SPRAGUE

PART

No.

TVL-70

TVL-8

TVL-19

TVL-31

TVL-7

TVL-23

TVL-21

TVA-6

UHO-

506

TVA-6

1FM-31

MS-45

1FM-21E

1FM-215

1FM-32

1FM-215

FM-32

1FM-215

FM-215

FM-15

1FM-21

1FM-35

PM-21

IDENTIFICATION

CODES

AND

INSTALLATION

NOTES

Filter

"

-

Filter

A.

"

•

Decoupling

B

S

A

Output

Oath.

Bypass

Filter

-

Filter

•

Hor.Output

Cath.

Byp.

*

Decoupling

•

Low

Pass

Filter

•2ndV.

Amp.Screen

Byf

Vert.

OutputCath.Byp.

Vert.

Cent.Bypass

Hor.

Cent.

Bypass

Bias

Filter

AGC

Filter

FixedPadder

SF

Cath.

Bypass

f{F

ScreenBypass

RF

Fll.

Bypass

RF

Decoupling

W

Bypass

Fixed

Padder

Mixer

Cath.Bypass

lixer

Screen

Bypass

Osc.Coupling

Osc.

Grid

Cap.

nn II

Fixed

Trimmer

*2.5%

Osc.Fll.Bypass

IF

Coupling

Fixed

Trimmer

* 5%

Fixed

Trimmer

" "

1stV.IF

ScreenBypass

1stV.IF

Plate

Dec.

IF

Coupling

AGC

Filter

2nd

V.IF

ScreenBypass

IF

Coupling

3rdV.IF

Cath.Bypass

3rdV.IF

ScreenBypass

RF

Bypass

3rdV.IF

Plate

Dec.

Diode

Filter

*1056

Video

Coupling

Fixed

Trimmer

V.

Det.

&

V.

Amp.

Fll.

Bj

AGC

Filter

*

Omit

bypass

section.

T

parallel

sections

to

obtain

desired

capai

*

Used

only

In

chassis

28F20Z.

ITEM

No.

R1A

B

R2

R3

R4

R5A

B

R6A

B

R7A

B

R8A

B

R9A

B

R10A

B

Rll

RATING

RESIST-

ANCE

l.SMeg.

Shaft

7502

202

1002

2

Meg.

Shaft

25K2

Shaft

50002

Shaft

100K2

Shaft

50KS

Shaft

1

Meg.

50002

3502

to

40002

WATTS

i

4

1

i

t

i

|

i

REPLACEMENT

DA

ZENITH

PART

No.

63-1671

Not

Req.

63-1668

63-1670

63-1669

63-1673

Not

Req.

63-1675

Not

Req.

63-1674

Not

Req.

63-1682

Not

Req.

63-1672

Not

Req.

63-1667

63-1690

IRC

PART

No.

W-750*

W20XlC&Sif

W-100*

Dll-120

KSS-3;

Dll-114

E

t

Dll-128

E

Dll-123

E

t

File

shaft

to

duplicate

original.

ITEM

No.

R12

R13

R14

R15

R16

R17

RIB

R19

R20

R21

R22

R23

R24

R25

PR26

R27

R28

R29

R30

RATING

RESISTANCE

1

Meg.

472

22K2

10002

2.2

Meg.

8202

6SOK2

10002

47002

15002

47K2

102

33002

822

2202

4702

10002

62002

WATTS

A

£

i

I

x

9

X

1

i

I

£

*

4

i

REPLACEMENT

DATA

ZENITH

PART

No.

63-1912

63-1729

63-1841

63-1785

63-1926

63-1782

63-1905

63-1785

63-943

63-1792

63-1855

63-1701

63-1806

63-1740

63-1758

63-1772

63-1786

63-1818

IRC

PART

BTS-1

r

BTS-22K

BTS-100

BTS-820

BTS-100

BTA-470

BTS-150

BTS-47K

BTS-330

BTS-470

BTS-100

PAGE

14

PARTS

LIST

AND

DESCRIPTIONS

ITEM

No.

ZENITH

PART

No.

REPLACEMENT

DATA

AEROVOX

PART

No.

CORNELL-

DUBILIER

PART

No.

ERIE

PART

No.

PART

No.

IDENTIFICATION

CODES

AND

INSTALLATION

NOTES

ITEM

No.

RATING

RESISTANCE!

WATT

3F20

and

28F20Z

Chassis

3F21

and

28F22

Chassis

r

Electrolytic

Capacitors.

1AGUE

iTNo.

L-70

L-31

L-23

A-6

C-

506

A-6

Filter

-32

-215

-32

-215

-21

•35

IDENTIFICATION

CODES

AND

INSTALLATION

NOTES

Output

Cath.

Bypass

Filter

Hor.

Output

Cath.

Byp

Decoupling

Low

Pass

Filter

2ndV.

Amp.

Screen

Byp

Vert.

Output

Catn.

Byp.

Vert.

Cent.

Bypass

Hor.

Cent.

Bypass

Bias

Filter

AGC

Filter

<Mxed

Padder

RF

Cath.

Bypass

RF

Screen

Bypass

RF

FI1.

Bypass

RF1

Decoupling

RF'

Bypass

Fixed

Padder

Mixer

Cath.

Bypass

Mixer

Screen

Bypass

Osc.

Coupling

Osc.

Grid

Cap.

Fixed

Trimmer

*2.5%

Osc.

Fil.

Bypass

IF

Coupling

Ixed

Trimmer

*

5%

Fixed

Trimmer

"

1st

V.IF

Screen

Bypass

1stV.IF

Plate

Dec.

IF

Coupling

AGC

Filter

2ndV.IF

Screen

Bypass

IF

Coupling

3rdV.IF

Cath.

Bypass

3rdV.IF

Screen

Bypass

RF

Bypass

3rdV.IF

Plate

Dec.

Diode

Filter

Video

Coupling

"ixed

Trimmer

V.

Det.

& V.

Amp.

Fll.

BypR26

AGC

Filter

C41

C42

C43

C44

045

046

C47

C48

C49

C50

C51

052

053

054

055

056

057

C58

059

C60

C61

062

063

C64

C65

066

C67

C68

C69

070

C71

072

C73

C74

C75

076

077

C78

C79

C80

C81

082

083

C84

085

C86

C87

C88

C89

C90

091

092

.01

.1

.01

.047

.1

.033

.0012

.0047

25

.005

500

3

.0047

.001

.022

.0047

.047

47

.1

250

.022

.01

.005

.01

.047

.1

.0022

150

470

.015

.0047

.047

.0047

.015

.0047

.047

150

.01

680

.001

.047

.1

500

30

.0047

.047

400

200

400

600

400

600

500

600

500

600

200

600

500

200

400

200

400

600

200

400

600

500

400

500

1000

600

2000(

600

27-1809

22-1777

22-1809

22-1775

22-1841

22-1901

22-1880

22-1847

22-1887

22-1706

22-1703

22-1693

22-1811

22-1886

22-1813

22-1782

22-1844

22-1674

22-1841

22-182

22-1845

22-1779

22-1842

22-1843

22-1844

22-1841

22-1845

22-1137

22-1138

22-1850

22-1847

22-1778

22-1775

22-1849

22-1850

22-1847

22-1844

22-1137

22-1846

22-1833

22-1851

22-1844

22-1841

22-1832

22-1871

22-1782

22-1844

P488-0]

P288-1

P488-01

P488-047

P688-1

P688-033

S8-001

P688-001

J8-0047

1468-000025

1467-005

1468-0005

P488-0047

1468-001

S8-022

P688-0047

P688-047

1468-00005

iS-1

1468-00025

;8-022

18-01

P688-005

'688-005

P688-01

'688-047

'688-1

P688-0022

1468-00015

1468-0005

P288-015

P488-0047

P288-047

P488-047

P688-0047

P288-015

P488-0047

58-047

1468-00015

P488-01

1479-0007

P1088-001

P688-047

J8-1

P688-1

P688-0047

P688-047

GT4S1

GT2P1

GT4S1

GT4S5

GT6P1

GT6S3

GT6D1

GT6D5

5W5Q25

1D5D5

5W5T5

GT6D5

1W5D1

GT6S2

GT6D5

GT6S5

5W5Q5

GT6P1

5W5T25

GT6S2

GT6S1

GT6D5

GT6S1

GT6S5

GT6P1

GT6D2

5W5T15

5W5T5

GT6S15

GT6D5

GT2S5

GT4S5

GT6D5

GT6S15

GT4D5

GT6S5

5W5T15

GT4S1

2R6T7

GT16D1

GT6S5

GT6P1

5R533

GT6D5

GT6S5

GP2-335-01

GP2L-0015

GP2M-005

GP1K-25

GP2M-005

GP2K-500

GP2M-005

GP2L-001

GP2K-50

GP2K-250

GP2-335-01

GP2M-005

GP2-335-01

GP2M-002

GP2K-150

GP2K-500

GP2M-005

GP2K-150

GP2-335-01

ST-4-01

ST-2-1

ST-4-01

ST-4-05

ST-6-1

ST-6-03

ST-6-001

ST-6-005

MO.5-425

MW.5-25

MO.5-35

ST-6-005

MW.5-21

ST-6-02

ST-6-005

ST-6-05

MO.5-45

8T-6-1

MO.5-325

ST-6-02

ST-6-01

ST-6-005

IT-6-005

ST-6-005

ST-6-01

ST-6-05

ST-6-1

ST-6-002

MO.5-315

MO.5-35

ST-6-005

ST-4-05

ST-6-005

ST-6-05

MO.5-315

ST-4-01

MWS.5-37

STM-16-

001

ST-6-05

ST-6-1

MOS.5-43

ST-6-005

ST-6-05

TM-11

TM-1

TM-11

m-is

rn-i

TM-13

TM-21

rM-21

PM-25

•B-425

1FM-25

1FM-35

LFM-21

TM-12

FM-25

TM-15

m-15

1FM-45

TM-1

1FM-325

TM-12

TM-11

TM-25

TM-11

TM-15

TM-1

TM-22

1FM-31E

1FM-35

TM-25

TM-15

TM-25

TM-S5

TM-15

LFM-315

TM-11

MS-37

TR-21

TM-15

TM-1

M3-43

TM-25

TM-15

AGO

Filter

Video

Coupling

Brightness

Cont.

Byp.

Pic.Tube

Cath.

Bypass

1st

S.

Decoupling

2nd

S.

Decoupling

2ndS.

Fll.

Bypass

Llmlter

Grid

Filter

Limlter

Decoupling

De-emphasis

ixed

Trimmer

±5%

Audio

Coupling

AF

Plate

Bypass

Audio

Coupling

Output

Plate

Bypass

Video

Coupling

3ync.

Coupling

Bypass

Sync.

Amp.

Plate

Dec.

Sync.

Coupling

~:ync.

Coupling

Sync.

Coupling

Integrator

Net.

Vert.

Osc.

Grid

Cap.

Vert.

Discharge

Vert.

Coupling

Differentiator

Net.

ior.

Sync.

Coupling

Fixed

Trimmer

Hor.

Sync.

Coupling

AFC

Filter

Hor.

AFC

Screen

Byp.

AFC

Coupling

Phase

Shifter

Hor.

Osc.

Grid

Cap.

Hor.

Osc.

Screen

Bypass

Differentiator

Net.

Hor.

Discharge

t

5%

Hor.

Coupling

Hor.

Output

Screen

Byp.

Damper

Filter

HV

Filter

Fixed

Trimmer

±

1056

Line

Filter

Fixed

Trimmer

4-

*

Omit

bypass

section.

t

Parallel

sections

to

obtain

desired

capacity.

*

Used

only

In

chassis

28F20Z.

CONTROLS

ITEM

No.

R1A

B

R2

R3

R4

R5A

B

R6A

B

R7A

B

R8A

B

R9A

B

R10A

B

Rll

RATING

RESIST-

ANCE

l.SMeg.

Shaft

7502

202

1002

2

Meg.

Shaft

25K2

Shaft

50002

Shaft

100K2

Shaft

50K2

Shaft

1

Meg.

50002

3502

to

40002

WATTS

i

4

1

i

I

1

REPLACEMENT

DATA

ZENITH

PART

No.

63-1671

Not

Req.

63-1668

63-1670

63-1669

63-1673

Not

Req.

63-1675

Not

Req.

63-1674

Not

Req.

63-1682

Not

Req.

63-1672

Not

Req.

63-1667

63-1690

IRC

PART

No.

W-750*

W20X10&S#

W-100#

Dll-120

KSS-Zf

Dll-114

E

t

Dll-128

E

Dll-123

E

ClAROSTAT

PART

No.

58-75Uf

43-1001

AM-83-S

KSS-3*

AM-40-S

KSS-3/

AM-19-S

KSS-Sf

AM-49-S

KSS-3

AM-44-S

KSS-3

INSTALLATION

NOTES

Vert.

Hold

Control

Attach

to

R1A

Per

Instructions

Focus

Control

Vert.

Centering

Control

Tapped

®

102

Horlz.

Centering

Control

Height

Control

Attach

to

R5A

Per

Instructions

Horlz.

Drive

Control

Attach

to

R6A

Per

Instructions

Vert.LinearityControl

Attach

to

R7A

Per

Instructions

Brightness

Control

Attach

to

R8APer

Instructions

Horiz.

Hold

Control

Attach

to

R9A

Per

Instructions

Volume

Control

and

Switch

Contrast

Control

Sensitivity

Control

t

File

shaft

to

duplicate

original.

RESISTORS

ITEM

No.

R12

R13

R14

R15

R16

R17

R18

R19

R20

R21

R22

R23

R24

R25

R27

R28

R29

R30

RATING

RESISTANCE

1

Meg.

472

22K2

10002

2.2

Meg.

8202

680K2

10002

47002

47U02

15002

47K2

102

33002

2202

4702

10002

62002

WATTS

4

|

4

l

4

REPLACEMENT

DATA

ZENITH

PART

No.

63-1912

63-1729

63-1841

63-1785

63-1926

63-1782

63-1905

63-1785

63-943

63-1792

63-1855

63-1701

63-1806

63-1740

63-1758

63-1772

63-1786

63-1818

IRC

PART

No.

BTS-1

Meg.

BTS-22K

BTS-1000

BTS-820

BTS-1000

BTA-4700

BTS-1500

BTS-47K

BTS-3300

BTS-470

BTS-1000

IDENTIFICATION

CODES

All

resistors

are± 1C*

unless

otherwise

stated.

RF

Grid

2056

RF

Cathode

RF

Screen

Decoupling

RF

Decoupling

Mixer

Grid

20%

Mixer

Cathode

Mixer

Screen

Dropping

30$

Mixer

Plate

Parasitic

Suppressor

1st

Video

IF

Grid

1st

Video

IF

Cathode

1st

Video

IF

Screen

Decoupling

20?

1st

Video

IF

Plate

Decoupling

gut.

AGC

Network

~

pn£

2nd

Video

IF

Grid

5%

R31

R32

R33

R34

R35

R36

R37

R38

R39

R40

R41

R42

R43

R44

R45

R46

R47

R48

R49

R50

R51

R52

R53

R54

R55

R56

R57

R58

R59

R60

R61

R62

R63

R64

R65

R66

R67

R68

R69

RYO

R71

R72

R73

R74

R75

R76

R77

RV8

R79

R80

R81

R82

R83

R84

R85

R86

R87

R88

R89

R90

R91

R92

R93

R94

R95

R96

R97

R98

R99

R100

R101

R102

R103

R104

R105

R106

R107

R108

R109

R110

Rill

R112

R113

R114

R115

R116

R117

R118

R119

R120

R121

R122

R123

R124

R125

R126

R127

R128

R129

R130

R131

R132

R133

R134

R135

822

2202

47002

4702

1502

33K2

4702

39K2

27K2

39002

2.2

Meg.

2.2

Meg.

10002

4702

330K2

22002

180K2

1.5

Meg.

68K2

10UK2

100K2

47K2

8202

12K2

33K2

1

Meg.

82002

18K2

39K2

62002

82K2

33K2

120K2

10K2

682

68002

682

100K2

1

Meg.

47K2

150K2

10K2

15

Meg.

22K2

100K2

220K2

330K2

2202

2.2

Meg.

2.2

Meg.

33002

33K2

18K2

.2

Meg.

2.2

Meg.

10K2

1

Meg.

12K2

1

Meg.

3.2

Meg.

10K2

82002

1

Meg.

220K2

82002

4.7

Meg.

.5002

53K2

10K2

J7002

,70K2

70K2

'602

'8002

02

OK2

9K2

7K2

OK2

500B

2K2

OK2

K2

8K2

OK2

20K2

60K2

2002

502

70KS2

502

OK2

5K2

.72

0002

70K2

202

02

Note

1.

Some

models

use2 5:

ASCRIPTIONS

01

5

1

i

)

•01

;

j

•01

>

)

5

3

D

-01

SOLAR

PART

No.

ST-4-01

ST-2-1

ST-4-01

ST-4-05

ST-6-1

ST-6-03

ST-6-001

ST-6-005

MO.

5-425

MW.5-25

MO.

5-35

ST-6-005

MW.5-21

ST-6-02

ST-6-005

ST-S-05

ST-6-05

MO.

5-45

ST-6-1

MO.

5-325

ST-6-02

ST-6-01

ST-6-005

ST-6-01

ST-6-05

ST-6-1

ST-6-002

MO.

5-315

KO.5-35

ST-6-005

ST-4-05

ST-6-005

ST-6-05

MO.

5-315

ST-4-01

MWS.5-37

STM-16-

001

ST-6-05

ST-6-1

MOS

.5-43

ST-6-005

ST-6-05

SPRAGUE

PART

No.

TM-11

ffl-1

rM-ii

TM-15

FM-1

TM-13

TM-21

TM-25

M3-425

1FM-25

1FM-35

TM-25

LFM-21

TM-12

[TM-25

rn-is

ra-15

LFM-45

PM-1

1FM-325

TM-12

TM-11

TM-25

TM-11

TM-15

TM-1

TM-22

1FM-31E

1FM-35

TM-25

TM-15

TM-25

TM-15

LFM-315

TM-11

M3-37

TR-21

TM-15

TM-1

M3-43

TM-25

TM-15

IDENTIFICATION

CODES

AND

INSTALLATION

NOTES

AGC

Filter

n

it

n

ii

Video

Coupling

BrightnessCont.

Byp.

Pic.

Tube

Oath.

Bypass

1stS.

Decoupling

2nd

S.

Decoupling

2nd

S.

Fll.

Bypass

Llmlter

Grid

Filter

jimiter

Decoupling

3e

-emphasis

Fixed

Trimmer

±5%

Audio

Coupling

AF

Plate

Bypass

Audio

Coupling

Output

Plate

Bypass

Video

Coupling

Sync.

Coupling

RF

Bypass

Sync.

Amp.

Plate

Dec.

Sync.

Coupling

Sync.

Coupling

Sync.Coupling

integrator

Net.

n

ii

n

ii

Vert.

Osc.

Grid

Cap.

Vert.

Discharge

Vert.Coupling

"

Differentiator

Net.

Hor.

Sync.

Coupling

Fixed

Trimmer

Hor.

Sync.

Coupling

AFC

Filter

{or.

AFC

ScreenByp.

AFC

Coupling

Phase

Shifter

Hor.

Osc.

Grid

Cap.

-lor.

Osc.

ScreenBypass

Differentiator

Net.

"

Hor.

Discharge

± 5%

Hor.

Coupling

rlor.

OutputScreenByp.

Damper

Filter

ii

n

HV

Filter

Fixed

Trimmer

±

10%

Line

Filter

Fixed

Trimmer

4-

INSTALLATION

NOTES

ert.

HoldControl

ttach

to

R1A

Per

Instructions

ocus

Control

ert.CenteringControlTapped

C

orlz.

CenteringControl

eight

Control

ttach

toR5APer

Instructions

orlz.DriveControl

ttach

toR6APer

Instructions

ert.

Linearity

Control

ttach

toR7APer

Instructions

Tightness

Control

ttach

toR8APer

Instructions

oriz.

Hold

Control

ttach

toR9APer

Instructions

olume

Control

and

Switch

Dntrast

Control

ensltivity

Control

*

102

IDENTIFICATION

CODES

islstors

aret

10%

unless

otherwise

stated.

:d

20%

;hode

-een

Decoupling

;oupling

Grid

20%

Cathode

Screen

Dropping

30%

Plate

'late

Irld

.tic

Suppressor

,deo

IF

Grid

.deo

IF

Cathode

,deo

IF

Screen

Decoupling

2C%

,deo

IF

Plate

Decoupling

2o%

itwork

20%

deoIF

Grid

5%

ITEM

No.

R31

R32

R33

R34

R35

R36

R37

R38

R39

R40

R41

R42

R43

R44

R45

R46

R47

R48

R49

R50

R51

R52

R53

R54

R55

R56

R57

R58

R59

R60

R61

R62

R63

R64

R65

R66

R67

R68

R69

R70

R71

R72

R73

R74

R75

R76

R77

R78

R79

R80

R81

R82

R83

R84

R85

R86

R87

R88

R89

R90

R91

R92

R93

R94

R95

R96

R97

R98

R99

R100

R101

R102

R103

R104

R105

R106

R107

R108

R109

R110

Rill

BUS

R113

R114

RUB

R116

R117

R118

R119

R120

R121

R122

R123

R124

R125

R126

R127

R128

R129

R130

R131

R132

R133

R134

R135

RATING

RESISTANCE

1

WATTS

822

2202

47002

4702

1502

33K2

4702

39K2

27KB

3900B

2.2

Meg.

2.2

Meg.

10002

4702

330KB

22002

180K2

1.5

Meg.

68KB

100K2

100KB

47KB

8202

12K2

33KB

1

Meg.

82002

18KB

39K2

62002

82K2

33K2

120K2

10KS2

68B

68002

6800B

682

100KB

1

Meg.

47K2

150K2

10K2

15

Meg.

22K2

100K2

220K2

330KB

2202

2.2

Meg.

2.2

Meg.

33002

33KB

18K2

2.2

Meg.

2.2

Meg.

10KB

10K2

1

Meg.

12K2

1

Meg.

2.2

Meg.

10K2

82002

1

Meg.

220K2

82002

4.7

Meg.

15002

33K2

10KB

27002

470K2

5602

68002

102

20K2

39K2

27KB

30K2

25002

22K2

10K2

5K2

16KB

30K2

220K2

560K2

82002

1502

470K2

1502

10K2

5K2

4.72

OOOB

470K2

6202

102

4

•£

^

4

l

4

•^

£

4

2

^

£

\

•£

2

Z

4

^

jj

1

4

i

I

4

1

4

£

•£

•i-

J

£

4

1

4

2

£

X

£

I

4

2

4

2

5

4

1

3

4

3

4

i

^

2

20

1

10

1

10

5

REPLACEMENT

DATA

ZENITH

PART

No.

63-1740

63-1758

63-1816

63-1772

63-1751

63-1848

63-1772

63-1852

63-1845

63-1809

63-1926

63-1786

63-1890

63-1919

63-1870

63-1856

63-1781

63-1831

63-1849

63-1918

63-1824

63-1827

63-1852

63-1579

63-1866

63-1849

63-1873

63-1684

63-1737

63-1571

63-1737

63-1870

63-1912

63-1194

63-1876

63-1828

63-1961

63-1842

63-1869

63-1883

63-1890

63-1227

63-1926

63-1807

63-1849

63-1827

63-1926

63-1827

63-1912

63-1831

63-1912

63-1926

63-1827

63-1824

63-1912

63-1884

63-1824

63-1940

63-1967

63-1848

63-1827

63-1169

63-1896

63-1775

63-1701

63-1566

63-1852

63-1845

63-947

63-1532

63-1842

63-1071

63-1533

63-1824

63-1751

63-1898

63-1578

63-1198

63-1679

63-1581

3-2011

63-1898

63-1685

63-1996

IRC

PART

No.

BTS-4700-5%

BTS-470

BTS-33K

BTS-470

BTS-39K

BTS-27K

BTS-3900-5%

BTS-2.2

Meg

BTS-2.2

Meg

BTS-1000

BTA-470

BTA-330K

BTS-2200-5%

BTS-180K

BTS-1.

5

Meg

BTS-68K

BTS-100K

BTS-47K

BTS-820K-5%

BTS-12K

BTS-33K

BTS-1

Meg.

BTS-8200

BTS-18K

BTS-39K

BTS-82K

BTS-33K

BTS-120K

AB-10K

BT-2-6800

BTS-100K

BTS-1

Meg.

BTA-47K

BTA-150K-5%

BTA=150K-5%

BTS-10K

BTS-15

Meg.

BTS-22K

BTS-100K

BTS-220K

BTS-330K

BW-1-220

BTS-2.2

Meg.

BTB-2.2

Meg.

BTS-3300

BTS-33K

BTS-18K

BTS-2.2Meg.

BTS-2.2

Meg.

BTS-10K

BTS-1

Meg.

BTS-12K

BTS-1

Meg.

BTS-2.2

Meg.

BTS-10K

BTS-8200

BTS-1

Meg-5%

BTS-220K

BTS-8200

BTS-4.7

Meg.

BTA-1500

BTS-33K

BTS-10K

BT-2-2700

BTS-470K

BTS-560

BTS-6800

BTS-39K

BTS-27K

BT-2-27K

AB-2500

BTS-22K

BTA-10K

AB-5000

BTS-18K

BT-2-27K

BTS-220K

BTS-560K-5%

BTS-8200

BTS-470K

W-2-150

T-2-10K

DG-15K

W-l-4.7

B-3000

AB-600

AB-10

IDENTIFICATION

CODES

ALL

RESISTOR

ARE1 10%

UNLESS

OTHERWISE

STAGED

2nd

Video

IF

Cathode

2nd

Vlaeo

IF

ScreenDecoupling

20%

2nd

Video

IF

Plate

5%

2nd

Video

IF

PlateDecoupling

go%

3rd

Video

IF

Cathode

20%

3rd

Video

IF

ScreenDropping

3rd

Video

IF

Plate

Decoupling

20%

PeakingCollShunt

AGC

Allp

.

Grid

Video

Det.

Load

R<Z

Bias

VoltageDivider

" '

1st

Video

Amp.

Grid

1st

Video

Amp.

Plate

Decoupling

AGC

Network

20%

1st

AGC

Amp.

Cathode

5%

Voltage

Divider

2ndAGC

Amp.

Plate

II

IIn n

AGC

Filter

20%

"

20%

""

20%

Video

Amp.

Plate

5%

Voltage

Divider

"

" 20%

2nd

Video

Amp.

Grid

20%

2nd

Video

Amp.

Screen

Voltage

Divider

PeakingCoilShunt

2nd

Video

Amp.

Plate

5%

Voltage

Divider

PictureTubeCathode

20%

Voltage

Divider

Bleeder

1st

Sound

IF

Cathode

20%

1st

Sound

IF

Decoupling

2nd

Sound

IF

Decoupling

2nd

Sound

IF

Cathode

20%

Limiter

Grid

20%

Isolation

20%

Limiter

Decoupling

Disc.

Load

5%

""

5%

De-emphasis

AF

Grid

ToneCompensation

20%

De-emphasis

AF

Plate

Output

Grid

OutputCathode

VoltageDivider

20%

Sync.

Clipper

Grid

20%

Sync.

ClipperPlate

Sync.ClipperPlate

20%

VoltageDivider

3ync.

Amp.

Grid

Voltage

Divider

Sync.

Amp.

Plate

Sync.

Amp.

PlateDecoupling

2nd

Sync.

Clipper

Grid

20%

2nd

Sync.

Clipper

Plate

Sync.

Sep.

Grid

20%

VoltageDivider

Sync.

Sep.

Plate

nn n

IntegratorNetwork

n

it

Vert.

Osc.

Grid

5%

Vert.

Osc.

Plate

Vert.Peaking

Vert.Output

Grid

20%

Vert.OutputCathode

BiasNetwork

Filter

See

Note

1

Horiz.

Disc.

Load

n

n n

AFC

Filter

20%

Horlz.

AFC

Grid

Differentiator

Net.

Horiz.

AFC

Cathode

Horlz.

AFC

Plate

5%

lorlz.

AFC

Screen

Dropping

VoltageDivider

bleeder

Filter

[oriz.

Osc.

Grid

20%

[oriz.

Osc.

Screen

Dropping

[orlz.

Osc.

Plate

Jlffereniator

ileeder

iorlz.

Discharge

Grid

Horlz.

Discharge

Plate

556

:oriz.

Peaking

'arasltlc

Suppressor

20%

orlz.

OutputGrid

oriz.

Output

Cathode

orlz.

OutputScreenDropping

DamperFilter

HV

Rect.Filament

liter

HV

Filter

i"ocus

CollShunt

BiasNetwork

Note

1.

Somemodels

use2

51002

resistors

in

parallel

in

this

application.

to

00

3

.

,

O

N

oo

I

KJ

P

K

to

00

to

oo

>

PAGE

15

PARTS

LIST

AND

DESCRIPTIONS

(Continued)

TRANSFORMER

(POWER)

ITEM

No.

T1A

RATING

PRI.

117VAC

®

2.35A

SEC.

1

790VCT

®

.170

ADC

650VCT

®

.210

ADC

SEC.

2

5VAC

®3A

sec.

3

5VAO

®3A

REPLACEMENT

DATA

ZENITH

PART

No.

95-1115*

STANCOR

PART

No.

CHICAGO

PART

No.

TP-390

MERIT

PART

No.

Used

In

chassis

28F20,28F21

TRANSFORMER

(POWER)

ITEM

No.

TIB

RATING

PRI.

117VAC

2.35A

SEC.

1

810VCT

g>

.170

ADC

660VCT

®

.195

ADC

SEC.

2

5VAC

®3A

SEC.

3

5VAC

@3A

REPLACEMENT

DATA

PART

No.

95-1124$

STANCOR

PART

No.

CHICAGO

PART

No.

TP-390

MERIT

PART

No.

Used

In

chassis

28F22

TRANSFORMER

(POWER)

ITEM

No.

T2

RATING

PRI.

117VAC

©

.76A

SEC.

1

5VAC

®2A

SEC.

4

6.4VAC

®

4.1A

SEC.

2

6.4VAC

g)

.6A

SEC.

3

6.4VAC

@5A

REPLACEMENT

DATA

ZENITH

PART

No.

95-1116

STANCOR

PART

No.

CHICAGO

PART

No.

MERIT

PART

No.

TRANSFORMER(SWEEPCIRCUITS)

ITEM

No.

T3

T4

T5

T6

T7A

B

T8

RATING

DC

RESISTANCE

PRI.

672

CT

572

4552

Tap

@

802

5902

142

602

5702

SEC.

582Tap

t>

152

2002

72Tap

a)

.52

SEC.

2

02

14S

REPLACEMENT

DATA

ZENITH

PART

No.

S-15041

95-1113

S-15015

95-1112

95-1110

95-1111

STANCOR

PART

No.

A-8121

A-8115

0

DY-1

FC-10

CHICAGO

PART

No.

TBO-1

TVO-1

0

MERIT

PART

No.

A-4000

A-3035

0

NOTES

Horlz.

Osc.-AFO

Trans.

Vert.

Block

Osc.

Trans

Hor.

Output

Trans.

Vert.

Output

Trans.

Hor.

Deflection

Yoke

Vert.

Deflection

Yoke

Focus

Coll

Drill

new

mounting

holes.

TRANSFORMER

(AUDIO

OUTPUT)

ITEM

No.

T9

RATING

IMPEDANCE

PRI.

51002

SEC.

3.52

DC

RES.

PRI.

5702

SEC.

.62

REPLACEMENT

DATA

ZENITH

PART

No.

95-1108

STANCOR

PART

No.

A-3849

CHICAGO

PART

No.

RO-9

MERIT

PART

No.

A-2902

INSTALLATION

NOTES

SPEAKER

ITEM

No.

SP1A

B

SP2A

B

RATINGS

FIELD

PM

CONE

niA.

9

3/8"

5"

V.C.

IMP.

3.52

V.C.

DIA.

3/4"

9/16"

REPLACEMENT

DATA

ZENITH

PART

No.

49-649

*

49-654

f

JENSEN

PART

No.

ST-120

MOD.P10-ST

ST-107

MOD.P5-V

QUAM

PART

No.

10A31

52A21

INSTALLATION

NOTES

T

Replace

output

transformer

to

match

6-82

voice

coil.

*

Used

In

models

28T960,28T961

28T962,

28T963

if

Used

In

model

28T925

FILTER

CHOKE

ITEM

No.

LI

L2

RATINGS

TOTAL

DIRECT

CURRENT

.170A

.210A

D.

C.

RESISTANCE

1352

INDUCTANCE

(0

CURRENT

1000^1

5

Henry

5

Henry

REPLACEMENT

DATA

ZENITH

PART

No.

95-1109

STANCOR

PART

No.

C-2325

THORDARSON

PART

No.

MERIT

PART

No.

C-2971

INSTALLATION

NOTES

PAGE

16

Zenith 28T925 User manual

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