Sams Commodore 1701, Zenith ZVM-135 Technical Service Data

SJJMS_C_Q_M_P_U_~_ER_~_A_C_T._S_T"

________

M_O_DZ_EEL_N~T_

V~_.1_35

PRELIMINARY SERVICE CHECKS

This

data

prov i

des
designed
tions

Check

correct

for

quick isolation

_

all

interconnecting

hookup

before

DISASSEMBLY INSTRUCTIONS

the user

with

a time-sav ing service

and repair of Moni

tor

cables for good connection and

making

service

checks

_

too

malfunc-

l

~ CHASSIS REMOVAL

Remove four screws

:I:~

~>

re

move b

-N

sc

Z...J

Ww

move

NO

two

o

AudiolVideo Sync

~

fro m

Remove fo
botto
Swee p B

Remove

ack

rews fr

om

two

screws holding top brace

screws

AudiolVide

ur

m chassis. Di

oar

fou

holding rear

d and li

r s

TEST EQUIPMENT

Digital Volt/

Oh

High Voltage Probe

RT

Te ste r

C

shatch

Cros

De

gau

Generator

ssing

Item

holding

from set. Lay set

cabinet

bottom

. Li ft cabinet to p from se

jack

Board guides . D

o Sync Boa

screws

sconnec
ft

crews

rd

holding

t all cables from HV/

board

assembly

hol

ding

m Meter

Coil

Part

No

.

Release
Disconnec t all cabl

cabinet

facedown

back, l

ift

and remove

up and

t.

to

chassis. Remove

pane l and

two

screws

isconnect

holding

all cables

and remove board from set.

HV/Hor

izontal Sweep Board

Horizontal

from

cabinet

.

cabinet.

two

CRT REMOVAL

Re-

Follow
on a

soft
degaussing coil Conn
tor

(3S3A and 2A3), speaker Con n

control

to

screws holding cabinet fro

dicator

In
Remove four screws holding CRT

Main Board

to

cabinet

bottom

ground conn

.

TEST EQUIPMENT AND TOOLS

TOOLS

Phillips Screwdriver
Low Voltage Soldering Iron
Desol

PARTS LIST AND DESCRIPTION

Description

Item

two plastic

"Chassi

protec ti

Connecto

Connector

ecto

der

ing Too l

retai ning

es

from Main Board and

s Remova

ve

surface. Disconnect HV anode lead,

ector (3T

rs (3S8, TP7, 2A7 and 2

(Z)

and remove cabi net fr

rs and lift CRT from se

No_

Part

clips

holding Main Board.

lift

l"

proced ure and lay set facedown

8),

de flection yoke Connec -

ect

or

(4P4),

B7)

. Remove four

nt

to

chassis

. Disc

onn

to

chassis. Disconnect

t.

Description

board from

front

ect Powe r

ont

from set.

panel

#FX320 1

CR3224
CR3231
CR

3232/33
CR3234
IC2376

Q3208

R2125

RX

3299A

36

1

103-330
103-315-06
103-31
103-315-06
2

21

63

95-3603

r

t,.

l

ist

ing of any availa

conSlitut.

in any

Howa

rd

W. Sams & Co .. Inc .. as

replacement

om

informati

fr
manu

facture

-113-23

5-06

-17

9-0

1

-09063-02

-0

1

case

0

part.

The

numb.rs

on furn

ished

rs

of 'he

particular

AC

Fuse, 4A @250V

Fast

Act

ing
Diode 330GI
Rectifier
Rectifier

Rectifier
IC,

Trans

Cont

Focus, Part

Diode 315-6C GI SW1701 85-1640-01
Diodes H315F4 53201
Diode 315-6C

GI

ChromaiLuminance

Processor

tp

Ou

(221-179-1)

istor, Hor

izontal PCB, HV/Horizontal Sweep

ut (TZ1029-01) (9-247)

rol, Vertical PCB, Vid

Centering

(550 Ohms) PCB, Start-up

of

Trans- PCB, Width

R3441

SW001 85-1628

63-108

57

85-1559-02

former (TX3204) PCB, Control

Assemb

Howard

4300

ble

r.placement

recommendation,

to

of

to

Howard

type

ly # For SAFETY use onl y equivalent repl

W.

the

these

West

of

quality

W.

replacement

Sams

62nd

Street,

port

herein

warranty

or

and

suitability

ports

have

been

Sams & Co., Inc.,

part listed

does

guaranty

of

compiled

by

not

by contenf

such r

the
.

& Co., Inc.

P_O. Box 7092,

Reproduction

.

in

any

espect

to

the

~ 1985

Howard

.. 300

West

62nd

Printed

in

U.S.

Indianapolis,

or

U

S.,

wifho

monn.

r, Is

of

the information

W.

sams

Str

..

t,

Americo.

prohibited.

&

P.O

use

of

ut

expre"

Co

"

Inc

.

.

So.

7092 , I

85CB14946

Indiana

perminion,

No

contained

ndianapolis

patent

Cont

rol, Horizontal

Cen

ter

ing (100 Ohm
Swi tch, Green/Whi te
Switch,
Sw
PC

RG

B/Co mp.

it

ch, Power

B, AudiolVideo Sync

(9-230)

ai

n (9-22

eo

7)

Output

PCB, M

acement part.

46206 U.S.A.

of

editori

al or

dian

it

aSiumed

a

~206

pictoriol

wit

U.S.A.

h

liability

herei

, In

n.

DATE 1·85

s)

PRELIMINARY SERVICE CHECKS (Continued)

PRELIMINARY SERVICE CHECKS (Continued)

MISCELLANEOUS ADJUSTMENTS

SEE

INTERCONNEC

THE

NUMBER

CHECKS

DEAD MONITOR

(A)

(B)

(C)

(D)

(E)

(F) If the 26.9

(G) If

NO DISPLAY

(A)

(B)

(C) If

TO BE PERFORMED.

Che

ck for

nector

ord

C

If Po
(S3201) and Connec

If
chec
Power

If Power
good,

(03208).

it and
sistor

If

Transistor 03208
colle
for

(9·227).

the
not operate, replace the HV/Horizontal Sweep
Board

Check

be

If there is
video, replace
(IC23

the

Au

120VAC b

3R8. If v

and Conn

wer

Cord is good, check Power Sw

the

120VAC is present at

k AC

Fuse (FX32

Rectifiers

Rectifier

check the Hor

If

Transistor

check

0320

8.

ctor

of

26.9V at

defective

diolVideo

Transistor
the

V is

26.9V is present and

(9

·24

7).

the

RGB/C

no

76)

on th e AudiolVideo Sync Board.

video

displa

TING DIAGRAM,

IN

THE

CIRC

LES

etwe

en

olt

age is missing, check Power

ector 3R8.

tor

(CR3231 th

s (CR3231 thru CR3234) are

for

156V at the

cathode of Diode CR32

missing,

omp Switch (SW1701), it may

or

in wrong

display

the

Chroma/Luminance Processor

y does

Syn c Board (9·

pins 1 and 3 of Con-

3S8.

01)

izontal

03208 is defective, replace

is good, but the

03208

when using only c

Connector

. If Fuse is open,

ru CR3234)

Output

collector

is

missin

replace the Main Board

the Monitor

position

.

not

return, replace

230).

SERVICE CHECKS

WITH

Transistor

of

156V

g,

24.

check

Tran·

at the

check

PLACEMENT

THOSE

itch

3R8,

CD

CHART, AN

IN TH E FOLLOWIN G DATA FOR SERVICE

(D)

(E)

NO COLOR

(A)

(B)

(C) If there

(D)

@ NO FOCUS

still

does

(A) Check

(B)

@ DISPLAY DOES NOT FIT ON CRT

omposite

(A) Check

the

(B) Adjust

D PHOTOS TO

If

there is no
Compos
the

HV/H orizont
missing, repla ce the
(9

·247).

Check

Board.

If there is no
video input, replace
cessor (IC237

If

the

A

udiolVideo

the

Green/White

If only one
put

Boa rd by

tion.

If

the

fo

cus, check

substitution.

Board.

Centering

disp

lay when

ite

Video inputs

al

Sweep Board.

CRT and CRT

color

6)

on

color

does n

Sync Boar d (9·2

is

no

color

Switc

color

is

substitution.

the

Focus

Control

cha

racters on the

the

connectors

Horizontal (R34

controls

MATCH

using either

, ch

eck for 95V at TP3 on

HV/Horizontal

socket

on Video

when

using

onl y

the

Chro

the AudiolVideo

when

missi

.

ma/Luminance Pro-

ot

return, replace

30)

.

using RGB

h (SW001).

ng, check

(RX3299A) by s

displa

Video Output Bo ard by

P1A and

y are

P2

41)

and Vertical (R212

RGB

If

the

voltage

Sweep Board

Output

composite

Sync board.

input,

the

Video Out·

ubs

still

on the W

or

is

the

cheCk

titu

out

ith

of

5)

VIDEO INPUT CUTOF F ADJUSTMENT

Preset the Red (R1708) and
MINIM

UM. Ad
pears. Ad
tained. Readjust
pears.

APC ADJUSTMENT

Connect a color
Ohm Ja

·Up position

Set
movem ent of color. Return Plug A 1

RGB

CUTOFF ADJUSTMENT

Preset the Red (R2505
Cutoff Controls
(RX3499B)
Control
RX3499B

RGB

DRIVE ADJUSTMENT

Conn ect a video generat or to Video

vi

deo generator

Set
Red (R2506), Green (R251
for a white

VERTICAL CENTERING AND HEIGHT ADJUSTMENT

Adjus

t Screen

just

Vertical

ing Con
of CRT
CRT. Readju

SWEEP OSCILLATOR ADJUSTMENT

Ad

just

·

just

just

each

the

ck

until

trol (R21
an

Sweep

bar signal gener

(P7)

. R

otate

. Ad

for

until a dim raster

a gray raster is

until

raster disappear

raster.

Control (RX3499B)

Height Control

25)

d the bottom

st

Control (RX3499B)

Oscill

Blue (R17
Screen (R3499
Cut

off

Control

Screen

Service Plug (A

just APC Contr

),

Green

MIN IMU

for

an all

7)

and Blue (R25

(R3418) and the Ver

so the

top

of

raster is 1/2

ator

Coil (L3402) for a

14)

Cutoff

Controls

B)

until a dim

until

Control

M.

appears. Adjust each

obta

s.

white

of raster is 1/2

a gray raster is ob·

until

raster

just

ato

r to th e Video

1)

90 degrees

ol (R2390)

to

(R2

516

Ad

ined. Readjust Control

Input

raster signal. Adjust

until

until

for

MINIMUM

Normal

position

),

and Blue (R2527)

jus

t Screen Control

75 Ohm Jac k (

28)

Drive

a ras

ter

appears. Ad·

tical

inch

inch

from

raster disappears.

stable

raster ap·

disap

Input

to

Co lor

.

Cuto

P7)

the

Controls

Center·

from top

bottom

picture

95V ADJUSTMENT

for

Connect a DC
Transformer
95V.

·

PURITY ADJUSTMENT

If the CRT appears
to

75

ff

.

of

.

demagnetize the CRT and

sary,

perfo

the

purit

be

adjusted.

Cont

rols
and Blue (R2527) C
Screen Co
Green

Cutoff

scr

green

tr

green s
stripe. Turn Gree n Cuto
the

Red Cutoff

defle

ctio
ed. If necessary, r
red screen. Check the
ing each

CONVERGENCE ADJUSTMENTS

Connect a cross
Jack

(P7

of

the

Four Pole

Horizontal

Blue
Static

Magnet aroun d the neck
Red and
S

tatic Magnet
tal Lines. Rotate the Tabs
around the neck of the CRT to converge the Red/Blue and
Green Vertic

PU

RiTY

MAG:-.iHS

meter

to TP3 (pin G

TX320

4). Adjus

to

rm

center

y adjustment

Set th e Color Level , Bl

to

MINIMUM. Set

utoff

ntrol

until a dim

, Black Lev

een. Move

ipe. Ad

n yoke

Cutoff

) and tu ne in a

Blue

just

Control to
for

ward
eadjust

Control

hatch

Static Magnet

Lines. Rota te

Vertical Lines. Rotate the Tabs of the Six Pole

to

converg e the Red/Blue and Green Horizon·

al

Lines.

t 95V

be magnet ized use a deg aussing

mounting

convergence. Before proceeding

, the Screen

the

Controls

raster appears. Adv an ce the

el

and P

def

lection yoke

the Purity Tabs

ff Contr

produce

until a uniform

the

purity

one at a time.

generato r
crosshatch

of

of

Horizontal Ou

Adjust Control

bracke ts. If neces·

Control

ack

Lev

Red (R2505), Green

to

MINIMUM. Advance

ictu

re Con

tro

back to pr

to

ol to MINIMUM. Advance

a red stripe. Slide

red screen is obtain·

Purity

Tabs to

of all three

to

to

the

of

the Six Pole St

colors

the Video

patte

rn. Rotate
converge the Red and
Tabs

of

the CRT to con verge the

(R3

(RX3499B)

el

and

ls to pro

center

the green

obtain

by advanc·

Input

the Four

atic

tput

409)

with

must

Picture

(R251

duce

oduce

a pure

75

Ohm

the

Tabs

Pole

Magnet

for

coil

6)

the

a
a

@

®

R3499B

@A

SCREEN

95V

TP

POLE

Sf

ATle

MAGNc

T

4

POi

f:

SiATiC

MACN[

r

CRT NECK ASSEMBLY

HV/HORIZONTAL

SWEEP BOARD

II

PRELIMINARY SERVICE CHECKS (Continued)

PRELIMINARY SERVICE CHECKS (Continued)

/

AOOIO{OOT

IN(

~

,\::::>,ffi-+--4

/'"-

-1-

AUDIO/VIDEO

®®

SYNC

@)

SOARD

CHla'toVLl.tlI

®

297

If..

III

LL~

NANCE

PROCESSOR

~

IC2~S

I

,.1

L...LL

I

I

Y

l.IL

/'lAIN

BOARD

2A3

C:;]'

1

HV/HOR

SWEEP
SOARD

I

ZONTA

L

@@

fi-

-

-

2A7

-

-

--..

Q

-

1-

~

0B25

RGS

IN

R344

~

~

[;J C

I

HOAIZCWTAl
CfHTERIN6

01

1 E

@)

58

~

I X

R2125 @

VERTI

CAL

CENTERIN6

-fi

_

~

t:<::\

~

CR3224

3W3

• I

I.

~

IS4V

SOURCE

3V3

.

T3201

'-'

I!f-J

~

:

3S3

.----_+---

fll

J......l

,

TP3

@

FOCUS

~

3R3

~

L---

PIA

---+-----t-t-t--J

WIDTH
BOARD

f"5A\

\::!.Y

SPI

SPEAKER

INTERCONNECTING DIAGRAM

VI

!il'

I!.J

TPS

SHARPNESS

00000

TINT

COlOR9LACK

LEVEL

PICTURE

'~

!I'

=;;"

~

I I

lrh,

~

@=p~

sw

ITCH

~'r

26.9V

@@

SWITCH

AND

VOLUME

MOUNTIN6

0

VOlt.t£

CONTROl

BRACKET

I

-&

~
~

@

t;1

=TES
TIE POINT

353

~U

P2

~

~

INTERCONNECTING

DIAGRAM

III

PRELIMINARY SERVICE CHECKS (Continued)

PRELIMINARY SERVICE CHECKS (Continued)

PIN1

@

IC2376~

0.Y

R2390

APC

AJUS

1

RH08

RtD

CUTOFF

R1714.

I:lLUt

CUTOFF

Al

StHVICE:

PL

UG

3:

o

eN
mm

""'z

N-

<-4

3:~

.....

(,.)

C1'I

AUDIOIVIDEO SYNC BOARD

IV

AUDIOIVIDEO SYNC BOARD

V

<

<

3:

»

z

tD

o

»

:::D

c

L3402

SWEEP

OSCILLATOR

ADJUST

R3441

HORll

CENTERING

A250

REO

DRI

VE

A2517

GREEN

ORIVE~~

R2528-

BLUE

DRIVE

®

VERI

CI::NTERING

A2125

R3233

CR3234

VERT

HEIGHT

A3418

®

95V

ADJUST

A3409

@

CR3231

CR3232

26.9V

@

~

-

,..,

..

A.

2f

r

.xr:~.tiJ-A'L..&.~"e:-,

..

CA3224@

4A

AC

@C

FUSE

"'tJ

JJ

m

I'

-

s:

z

»

JJ

-<

CJ)

m

JJ

<

-

C')

m

C')

:%:

m

C')

CJ)

"

C')

-

o

::s

-

::::J

C

(I)

Q.

-

o

l>

tD

Z

m

":-'

:::D

m

»

:::D

<

m

::E

®
®

~@

~

@

~

®P

f3C\

GREENIWHITE

~

SWITCH

f2i0

V

SWITCH

1 F

®

R2527

BLUE

CUTOFF

P7

VIDEO

OUTPUT

BOARD

082

GB

IN

SW001

SW170

RGB/COMP

MAIN

BOARD

/

@

R2516

GREEN

CUTOFF

. f

1-,'

I

.':

rl

.'

( -.

120VAC

@

~~~1

@

P1A

WIDTH@

-P2

BOARD

Q3208

HORIZONTAL
OUTPUT

VI

HORIZONTAL

SWEEP

BOAR~

~

@

10

f1'"2\

&

@;

"'tJ

JJ

m

I'

s:

Z

»

JJ

-<

CJ)

m

JJ

<

-

C')

m

C')

:%:

m

C')

CJ)

"

C')

-

o

::::J

-

::s

c

(I)

Q.

-

a_

~

...

W~.

5

It)

C'?

":'"

:x::ii!

....

>

-N

Z....l

Ww

NO

0

:ii!

N

•

t--

I-

:E

(J

~

COM UT R ZENITH

_______

P

__

IE

__

PRELIMINARY SERVICE CHECKS

SAFETY PRECAUTIONS

See pages

8,

9.

FA_C

__

Ts_rM

Mode

l ZVM·135

ENCLOSED

______________

SERVICE INFORMATION

See page

~MO_D~EL_Z~VM_'1~35

3:

o

ON

mm

r""Z

N-

5.

<-4

3:::I:

B

lock

Diagram
Convergence
Disassembly Instructio
Gri dTrace Lo

AudiolVideo
HV/H ori
Main
Video Outp

High

Volt age Sh

cellaneo

Mis
Parts
Photos

AudiolVi
C

abinet

Co

ntrol Board.
CRT Neck
HV/

Adjustment.

cation

Guide

Sync

Board

zonta

Board . . .

List

Horizontal Swee p Board

The
constitute

Howard
replacement
from

manufact

l Sweep

........

ut

Board . . . . . . . . . . . 33

utdown . . . . . . . . .

us

Adjustments.

. . . . . . . . . . . .

deo

Sync Board . .

·Rear View . . . . . . . . . . . . .

Assembly

listing

of

any available replacem

in any

cose a recommendation,

W. Sams &

Co., Inc.

port. The

information

urers

furnished

of

the

..

......

. Photos (Continued)

ns . .

Board.

.

. .

...

10,1

. . ....

...•.

Howard

West

4300

ent

, as

to

the

to

of

Howard

type

quality

these

parts hO\lle

W. Sams & Co .. Inc. .

of replacement

numbers

partlCulor

.

.........

20

thru

1,12,37,38,39

.

....

..... 17,18,

W.

Sams

62nd

port

herein

warranty

or

cnd

suitability

been

port

INDEX

Page

....

4

'"

. 7

45

. .

.36

...

18

. 34

..

5

. 7

29

.45
. 19

7

32

Street.

does not

gua

ran

of

compiled

by

listed.

Horizontal Output Board
Main Board
Video

Widt
Placement Chart
Resistance Measurements .
Safety Precautions
Schematics

Notes .......

Power Supp ly ......

Termi nal Guides . .
TV

..
Service I
Servicing in the Field.

Troubl

eshooting.

Troubleshooting

..

Output

h Board

nformation

& CO., Inc.

P.O

. Box 7092.

Reproduction or

ty

by

content, in

such raSpEKf

~

1985

the

"300

Pr

inled in

cny monner

to

the

How

ard

West 62nd

U.S. of

Indianapo

use, without

us.

of

W.

Saml

Street

America.

. ....

.. ..

Board

.........

.....

...

Aid

lis .

express

, is

prohibited.

th.

information

&

Co.

, Inc.

. P.O . Box 7092. I

Pa

ge

........

.

. . .

........

. . . . . . .

. .

. 13,14,15,

. .

... 31

35

.. 16,33

...

30

..

. . 43

.8,9

. . . 5

.3,46

6

. ... 44

.2

,47,48,

49

.

....

5

. . . .

45

.41,42

.....

.. ..

40

Indiana

permissi

No

potent

containe

ndianapo

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SERVICE INFORMATION

HIGH VOLTAGE SHUTDOWN DEFEAT

CAUTION: Care
Voltage
voltage and
(T
T
be
troubl esh
tion
supply.

To
CX3209 and l
shutdown circuit, ch
(OX3202). If
check
dow

"Shutdo

moni tor in shu

NOT

ITEM

OX3202
03204
0 3207

Shu

X3204

), CRT

ransformer

comes excess

oot

trans

defeat

the volt

n Transistors (OX3202,

wn V

E:

Vol tages are measured with monitor in s

sho

tdown Circuit

damage

a set with excessi

form

the shutdow

ift

the shutdo

uld

to

or

other

TX3204.

ive,

do not

er with a

from

the

eck for a shorted Switch Transistor

ages and

olt

age

Chart

tdown.

SHUTDOWN VOLT

E

OV

7.1V

1.5V

be taken in

whi ch may cause

the Ho rizontal

circu

its

Monitor

stepdown

n circu

board.

wn

comp

" fo r

the

defeat

the

ve

high voltage, use an isola-

control

it

unsold

If

this does

circuit

is not

onents

03204

voltages

AGE CHART

B C

0.

76V

6.4V

2.25V

and 03207) . See

defeating

Output Transformer

supp

high vo ltage,

shutdown

er one end

worki

asso

measured

excessive

lied B +

circ

as an AC

not

ng properly,

ciated

hutdown.

0.02V

7.03V

1.51V

the

uit. To

power

of

Diode

defeat

with

with the

Shut-

SCHEMATIC NOTES

High

high

from

if

the

the

HIGH VOLTAGE SHUTDOWN CIRCUIT DESCRIPTION

The high voltage is

horizontal pulse , at pin N
Transformer (TX3204). The pu Ise, r

CR3206, is appl ied

Zener Diode CRX3204 then

it

Transistor
the
begin to
Shutdown
Transistor
base of
Diodes CR3209 and CR3211, and
to
cause the Forward Driver
disable
cuit
TX3204 at pin D thru
TX3204 breaks down, the arc
Transi
start Transistor
circui

(03207). If the

Diode CRX3204 will

conduct

Transisto r

03204

Switch

conduct. When

the horizontal drive and

. The

stor

t.

shutdown

03207

monitored

to a resistor

and apply

03204

conducts

Transistor

Transistor

circ

Resistor

to

go

negative w

03207

conducting,

by

of

to

the

high

vol

tage

conduct,

enough

to

cause: it

a bias

(OX3202)

causes

OX3202

Transistor

shutdown

uit

also

RX3206.

transient

ith

rectifying

the

voltage

base

becomes

Transistor

voltage

voltage

thru

(03206)

monitors

causes

respect to

activating

the

60V

pop

Horizontal Output

ectified

to

Transistor

by

divider

of

the

Shu

excessive,

03207

to

the

conduct.

is

applied

Resistor

conducts,

to

conduct

the

horizontal cir-

Transformer

If

Transformer

the

the

the

shutdown

Diode

network

tdown

base

When
to

RX3204,

OX3202

it

emitter

base

will

the

will

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to

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Circuitry
Circu

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Waveforms

Waveforms

Tim

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Supp ly voltages
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Term inal i
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El

Resis
Value in ( ) used in
Measu

not

used in

it

ry

used in

ist

ound

tie

point

and voltages taken from

otherwise

75 Ohm Input J

e in fLsec. per cm, given w

each waveform.

stment

ju

lt

ages measured

ectr

noted

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taken using a col

instruction

rols

adjusted

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are

olyt

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are V2W

rements

some

some

versions

ack

(P7) unless noted.

in

rectangles

s.

maintai

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with digita

for

norma

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50

vol

ts

or

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are

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some

with sw i

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versions

ground

, unless

or

bar signa l app lied at Video

ith

pop

reading at the end

appear in the alignment/ad-

l meter,

l operation.

not

less,

50

5%

versions

as show n, unless noted.

no

signal.

be found on uni

5%

unl ess noted.

volts

or less, 20%

unless noted .

.

t.

unless

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5

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MISCELLANEOUS ADJUSTMENTS

VID EO INPUT CUTOFF ADJUSTMENT

Preset

the

Red (R1708) and Blue (R1714)
MINIMUM. Adju
pears.

Adjust
tained.
pears .

APC ADJUSTMENT

Connect a color
Ohm
Set-Up
movement

RGB

Preset
Cutoff
(R
Control
RX

RGB DRIVE ADJUSTMENT

Connect
Set vi
Red (R2506), Green (R2517) and
for a white

VERTICAL CENTERING AND HEIGHT ADJUSTMENT

Adjust
just
ing
of
CR

SWEEP OSCILLATOR ADJUSTMENT

Re

Jack

position. Adjust

CUTOFF ADJUSTMENT

the

Controls

X3499B)

until

3499B

a video

deo

Screen

Vertical

Control

CRT and

T.

Readjust

st

Screen (R3499B)

each

Cutoff

adju

st

the Screen

bar

(P7).

Rotate

of

color

. Return Plug A1

Red (R2505), Green (R2516), and Blue (R2527)

for MINIMU M.

until a dim

a gray raster is

until

raster

generator

generator

raster.

Control (RX3499B)

Height
(R2125) so the
the

bottom

Control (RX

Con trol

Control

signal

gen

Service Plug

raster appears . A

disappe

for an all white raster signal.

Cont

erator

APC

Control

obtained

ars.

to Video

Blue

rol (R3418) and the Vertical Center-

top

of

of

raster

3499

B)

Cutoff

Controls

until a dim raster

until

a gray raster is ob-

until

raster

just

to the Video Inp

(A

1)

90 deg rees

(R23

90)

to

Normal

Adjust

Screen Co

djust

. Readju

Input

75

(R2528) Drive Controls

until

a raster appears. A

raster is 1/2

is 1/2 inch fro m bott

until

raster

for

MINIMUM

position.

each C

st

Ohm

Jack

Adjust

inch

disappears

to

from top

Control

for

ap-

disap-

ut

Color

ntrol

utoff

(P7).

the

om

95V ADJUSTMENT

Connect a DC

Transformer

95V.

PURITY ADJUSTMENT

If the CRT appears to be magnetized use a
to demagnetize the CRT and

sary, perform

75

the

purity

be adjusted . Set the

Contro

ls to MINIM UM. Set
and Blue (R2527)
Screen
Green

Cutoff

green screen. Move

stripe

green
stripe.

Turn Green

the Red
deflection
ed. If necessary, readjust the Purity Tabs to
red screen. Check the

ea

ch Cut

ing

CONVERGENCE ADJUSTMENTS

Connect a
Jack

(P7)
of the Four Pole
Blue Horizontal Lines. Rotate the Tabs

d-

Static

Magnet around the neck
Red and Blue Vertical Lines. Rotate
Static Magnet

of

tal Lines. Rotate the Tabs

.

around the neck
Green Vertical Lines.

meter

to TP3 (pin G of

TX3204).

center

adjustment

Control

, Black Level and

. A

Cutoff

yoke forward

off

crosshatch

and tune in a

Adjust

convergence. B

, the Screen

Color

Cutoff

until a dim

deflection

djust

the Purity Tabs to

Cutoff

Control

Control

to converge the Red/Blue

to

until a uniform

purity

one at a

generator

crosshatch

Static Magnet

of

the CRT to c

95V A

Level, Black Level and

the

Controls

raster appears.

Control
produce

of

Hor

izontal

djust

Control

mounting

Picture

of

of

the

brac

efore

Control

Red (R2505), Green (R2516)

to MINIMUM

Controls

yoke

back to

to

MINIMUM. Advance

a red stripe.

red screen is

all three

time

.

to

the

Video

pattern. Rotate

to

converge

the CRT to

the

Tabs

and

Six Pole

onverge

(R3409)

degaussing

kets

. If
proceeding
(RX3499B)

center

colors

of

Green

the Red/Blue and

Picture

. Advance

Advance

to

produce

produce

the

Slide

obtain

by advanc-

Input

75

the

the Red and 0 N

the

Four

converge

of

the Six Pole < -I

Horizon-

Static

Magnet

Output

for

coil

neces

with

must

the

green

the

obtain·

a pure

Ohm

Tabs 0

Pole

the

a
a

-

s::

~

N-

s::

~

Co)

UI

m

Z

Z

Adjust

Sweep

Oscillator

Coil (L3402)

for a stable

4

POLE

STATIC

MAGNET

picture

.

PURITY

MAGNETS

POLE

SlATIC
MAGNF

r

CRT NECK ASSEMBLY

7

SAFETY PRECAUTIONS

PRODUCT SAFETY SERVICING GUIDELINES FOR COLOR TELEVISION RECEIVERS

CAUTION:
tempted
are
checks
the

risk

Afte
check

SUBJECT: FIRE & SHOCK HAZARD

1.

Be sure
way as
shorts. This
which

2.

Never release a repair unless all
as i
othe

3. Soldering
solder
cluding AC cord),
Be

4.

Check
ponents
tion

lead

5.

No
resistor
protruding

6.

All critical components
diagram)
tors, etc. mus
not
ified

After
leakage
metallic
knobs,
the set is safe
shock. DO
ER
5000
manner;
(63
capaci
(water pipe,
parts,
combination
Reverse the AC
ments
sured
to
stitutes a potential shock
immediately.

No

modification

. Service

thoroughly familiar

aod servicing guideli nes. To

of

r the

original

shou

are

nsulators

r hardware have been

cer

tain

the

and replace
length

lead

use

or

re-assembly of the set always

antenna

DURING THIS TEST. Use an AC

ohms

-10401-76), paralleled by a .
tor

one

for

must

0.5

milliamp AC.

work

potentia

ld be made

joints,

or

rated at 1

replacement
make

test

l hazards and injury

SAFETY CHECKS

service problem has been co rrected, a

that

all

to

for

parts

components

avoid

is

especially

transported

, barriers, covers,

must

be i

frayed leads, damaged in sulation (in-

solder

to

remove all l

"across-

physical

if

and

dress

component

metal

surfaces

such

as

t be replaced

unrecommended

at

DC

of

terminals,

to

NOT USE A LINE ISOLATION TRANSFORM-

per volt

Connect

(22-4384) between a

conduit

at a

time

of

1500 ohm

plug

each

exposed

not

exceed .75

of any

should

be

wit

h all

of

the

following

possibility

important

to

and

from

shie

reinsta

nspected

the

evidence

necessary.

.

watt

fuses

components

ground

the

operate

or

a 1500

, etc.) and the exposed

. Measure the AC voltage across the

and repeat AC voltage measure-

Any

to

splashes

oose foreign

-line"

capaCitor and

should

touch

or

more. Lead tension around

must

(shaded on

, fl

ameproof
with

test

cabinet, (the cha nnel

handle

without

more

sensitiv

known

resistor

metallic
volts

value

hazard and

performed

of

are

of

circuit

point

ohm

exceeding

circui

t should be at-

only

after

you

the

following

do

otherwise increases

to

the user .

:

positioned
adjacent

on

the

repair shop.

protective devices such

lds,

stra

lled per origin

discover possible

or

sharp solder

particles.

of

damage

Follow

original layout,

a receiving tube or a

be avoided.

the

resistors, capaci-

exact

Zenith

other

than those spec -

modifications

perform

and on all exposed

and screws)

danger

voltmete

ity, in the f

10

watt

15

mfd

. 150V

good earth gro und

and .15 mfd. capacitor.

part. Voltage mea-

RMS. This corres ponds

must

safety

in such a

compo

nent

those

chass is

in reliefs, and

al

des ign.

co ld

points

other

com-

or

deteriora-

sc hematic

types.

an AC

selector

to

be sure

of el

ectr

r,

having

ollow

resistor

AC

type

metallic

this

limit

con -

be corrected

Do

.

ical

ing

I

~

o A.C. VOLTMETER 0

22-4384

.

15

MFD

TY

A.C.

TO

GOOD EARTH GROUND 1500 ohm 10
SUCH AS WATER PIPE,
COND

UI

T. ETC. ON EACH EXPOSED

.

SUBJECT: IMPLOSION

1. All Zeni

2. Use only recom mended Zenith replaceme

SUBJECT: X-RADIATION

1.

2.

3.

th

picture

pl

osion

protection system , but care should be take n
avoid damage
tube.

Be

sure procedures and in
sonnel cover the
tial source of X-r
tube

. However,
H.V. is at the factory specified leve
H.V. is ex cessive that X-r
fer

to

the

X-ray Precaution Lavel which is located
each television receiver f
proper value is
manua

l.

Operation at higher volt ages may cause a
failure of the pi
under certain
ex

cess of desirable levels.

Only

Zenith

speci fied CRT anode
used. The degau
shield in

II is
curate and
of
reference standa rd, such as the one available at your
di

color

essential that

the

mter

stributo

r.

re

liable high voltage meter. The calibrat ion

sho

63-10401·76

tubes are

during installa

sub

ay

s in

this

al

so given in the app

cture

circumstances

ssin

sets, do not defeat its

uld be checked periodically agains t a

equipped

struct

ject of X-radi

current

tube

does

ad

iation may be generat ed. Re-

or

th e correct high voltage. The

tube

or

g shield

the serviceman has available

I

PE

watl

PLACE THIS PROBE
ON

DC

GROUND AND

METALLIC P

with

ti on.

AVO

ions

atio

n. The only poten-

TV receivers is the picture

not emit

l.

It is on ly when the

high voltage supply and,

, may prod uce radiatio

connectors

also

serves as

AR

T.

an

integr

al im-

id scrat c

to

purpose.

hing

nt

tube

s.

all service per-

X-rays when the

inside

lica

ble service

must be
an X-ray

an

to

the

n in

ac-

Courtesy of the Ma

nufacture

r

8

SAFETY PRECAUTIONS (Continued)

4. When the
there is
tim
be run up and
w

ith a meter

exceed the

rec

tion review
always

that
cu

stomer's

5. When
in a receiver

avoi d being unnecessarily close

the high vo

cha
excessive

6. Col
Line and l

desi gned
causing

mended that the C.R.T.
the n

.V

H

advisable. The C.R.T. 's in

replaced w

cess

ex

7.

Star
special
feature,
defeat
viced, f
capa
(used in

must

(22-7504-01). Please refer

No. 8

questi

high

no possibility

e a color

tly

. We

check

the

tr

oub

ssis longer

or

tra

nsis

ew

type

. m

eter

ive X-radiat io n and

ting

four

ed. However, each time one

or

citor shoul

be replaced

7)

for

ons,

volt age

of

chass

is is serviced,

dow

n while

to

be certai n

spec

ified value and that it is regu

sugg

est

test

high voltage reading be recorded on each

invoice.

leshoot

lt

voltage.

ater

to

withstand

excessive

to

ith

with

the interlock

whatever reason ,

"E

" and "F" model li nes only), th

the detai

or

that

proc

edures so

ed as a

with a prob

tor sets manu

tub

the

you may

sta

ing and

age

com

partmen

tha

n is necessary to lo

),

use new

higher operat

X-radiation. It is

e.

Additi

H.V.

anode

any

other tube

late

produc

lead damper c

ing f

d be examined.

with

an i

ls.

Your

write

circuitry

an X-radi

that

you and you r service organiza-

nd ard

lem

type

shop

on

possib

is

operating

ation

the

brightness

monitoring

the

that
servicing

making

of

t.

fact

ured after

pict

fixture

of

a permane

of

the

these sets

types as

tion " E"

apacito

our

the

mproved recommended

to

Zenith Tech

distributor

to Zenith for

the

high

volt age

vol

tage

test

excessive

to

the p

Do n

cate

ure tubes

ing vo

strongly

be equi

shop C.R.T. fixture is

shou

that

le violation of

line

r was

leads,

of

these

part n

If

it

is

the

proper

proble

m. Every

high

does not

lating

regul

procedure, and

meas

urements

high

icture

tube

ot

operate

the

cause

June

, 1973 (" E"

specif

ltages

pped with

ntly connec

ld never be

may

result

the

color

use

should not

set

umber

22-7233 type

at

capac itor

Top

ics (Issue

will

answer

further

shou

voltage

cor-

ation

voltage

and

the

ically

without

recom-

ted

law.

sets
d.

s is ser-

of

the

type

any

detai

ly

SUBJECT: TIPS ON PROPER INSTALLATION

ld

1.

Never install any receiver in a c losed-in rec ess, cubby-

is

,

of

in

, a

Its
be

ls.

hole or closely

2. Never

3.

4.

5.

6.

7.

8.

9. Caution cus

insta

the path of heated air flow.

Avoid

conditions

install

atio

where stea m leakage is a f

Avoid placement where drap erie s may
venting. The cu
decorati
obstruct

Wall and shel f mounted in stallations
mount

ing kit,

ting i

nstructio

A receiver
original feet (or the equivalent thi
provide adequate air
screws used for fastene rs
wiring . P
tions.

Caution
on a sloping she
receiver is properly secured. m

A receiver
mounti

ng to the cart. Caution
hazards
thresho

which has n
Inc.

for

receiver.

fitting

shelf space.

ll a receiver ove

of

high

hum

ns where dew is a factor, near

ve

ventilation.

customers against

of try

lds

stomer

scarves or

must

foll

ns.

mounted

erform

in

or

use with the

to a shelf

leakage t

lf

or in a t

a roll-

about

ing to roll a cart

deep pile

tomers against

ot

been l

isted

other

ow

flow across

carpets

ir

r,

or

close

to

a heat duct, or in

idi ty

suc

h as;

stea

actor, etc

sho

the

mus

ests

the

cart should be

by U

speci

.

uld also avoid t

coverin

gs which might

usin

factory

or

t not touch any

ilted posi

wit

.

the use

nderwriters Laborato

fic model

approved moun-

platform

cknes

s in spacers)

the

botto

on customized installa-

mounti

ng of a receiver

tion,

the

custo

h small

of

a cart or sta nd

outdoor

obstruct

g a commerc

must

casters

of

pat

m radi

ators

he

use

retain

m.

Bolts

parts

unless the C

stable

in its

mer on

across

tel evi

io

rear

of

ial

its

to
or
or

the

ries,
sion

(')

3:

.....

~

I\)

~

'z

~

3:

~

~

~

-I

::I:

Cour

tesy

of the

Manufacture

r

9

3:

o

eN

mm

r-

z

N-

<-4

3:::I:

.....

Cot)

(11

AUDIOIVIDEO

10

SYNC

BOARD

C

BE

01713

E B C

01707

C B E

Q1745

C B E

01744

AUDIOIVIDEO

SYNC

BOARD

39