CBS 205c schematic

PHOTO

FACT*

Folder

CBS-COLUMBIA

MODELS

2O5C1,

2O5C2

TRADE

NAME
MANUFACTURER
TYPE
TUBES

POWER
TUNING

Alignment
Block
Disassembly
Miscellaneous Adjustments
Parts
Photographs

CBS-Columbia

SET

Forty-five

Diagram

List

Cabinet-Rear
Capacitor Identification
Capacitor Identification (Sweep
Chassis-Top
Chassis-Top

RF

CBS-Columbia, A Div.

Color Television Receiver

SUPPLY

110-120 Volts AC-60 Cycles

RANGE

Channels 2 thru

Instructions

Instructions

and

Tuner

*

Descriptions

View

View

(RF-IF

View

(Sweep

FINE

TUNING

Models

13

(RF-IF

Chassis)

Chassis)

205C1,

of

VHF,

Chassis)

Chassis)

HORIZ.

HOLD

CONTROL

CBS-COLUMBIA

205C2

Columbia

14

.

thru

Broadcasting

83

UHF, Video

....

20, 29

21

thru

CHANNEL
SELECTOR

MODEL

INDEX

6, 7

Photographs

3

27

27

19

31, 32

. 11, 18

28

28

. 10

VERT.
HOLD

CONTROL

-i

HUE

/RANGE

BRIGHTNESS

CONTROL

^CHROMA

CONTROL

CONTRAST

CONTROL

ON-OFF

SWITCH

VOLUME

CONTROL

TONE

CONTROL

205C2

System,

Inc.,

48-50 34th.

RATING

4.9

Amp.

IF

45.75MC,

Resistance Measurements
Service
Schematic (Tuner)
Schematic
Tube Placement Chart
Tube
Waveforms

Sound

(Cont)

Resistor

Identification (RF-IF

Resistor

Identification (RF-IF

Resistor

Identification
Inductor & Alignment Identification
Trans.

Inductor & Alignment Identification

Adjustment

(TV)

2

Placement Chart (Top

9

® 117

IF

41.25MC

(Sweep

4

Location

30

(Bottom

View)

St.,

Long Island City,

Volts

AC

(Intercarrier)

Chassis)
Chassis)

(RF-IF
(Sweep

Charts

View)

8

R1-R151..

R191-R293

Chassis)

19

5

.....13,13

Chassis

Chassis)

......12,

33

........

N.Y.

.14,

17

33

15

0

DO

Y»

o
O

c

03

O

to
O

Ui

rO

O
m
n

K)

"The

listing

of any

quality

and

been

compiled

manufacturers

or

available

suitability

use,

case a recommendation,
as

to the

parts

have

Inc.,

by the

"Reproduction

HOWARD

replacement

warranty

from

information

of the

without

express

part

or

guaranty

of

such

replacement

particular type

permission,

W.

SAMS & CO., INC. • Indianapolis

tent,

herein
by

Howard

furnished

of

does

not

W.

part.

The

to

Howard

replacement

of

editorial

constitute

in any

Sams & Co., Inc.,

numbers

of

these

W.

Sams & Co.,

port listed."

or

pictorial

con-

in any

the

use of the
Sams & Co., Inc.,
ternational
Union

(1910)

DATE

10 -55

manner,

information

Indianapolis

Copyright

by

Howard

5,

is

prohibited.

No

contained

5,

Indiana,

Union.

All

rights

W.Sams & Co., Inc."

Indiana

patent

liability

herein.

Copyright

U. S. of

reserved

under

Printed

is

assumed

1955

America.

Inter-American

with
by

Howard

Copyright

in U. S. of

SET

respect

to

W.

under

In-

Copyright

America

293

FOLDER

2

1ST

SOUND

3)6AU6

IF

PAGE

2

©

-u.

DENOTES

CHASSIS

@

1?OV

.TV

GROUND

©=J:

[&?

,©'

W47

W44 W50

CBS-COLUMBIA

MODELS

2O5C1,

2O5C2

UHF

ANT

VHF

rnr

ANT

BLOCK DIAGRAM

'IDSOZ;

siaaow

viawmco-saD

Item

Tube

VI

6T4

V2

6BZ7

V3

6U8

V4

6CB6

V5

6CB6

V3

6CB6

V7

6CB6

V8

6CL6

V9

6CL6

V10

6AN8

vu

6AN8

6AN8

V12

6AU6

VU
V14

6AU6

V15

6AL5

V16

6AV6

V17

6AQ5

12

AT

V18

V19

V20

V21

V22
V23

V24

V25

V26
V27

V28

V29

V30

V31

V32

V33

V34
V35

V36

V37

V38

V39
V40

V41
V42

V43

V44

V45

7

12AT7

6BL7GT

6AL5

12AU7

6CU6
6CU6

6AU4GT

6AU4GT

3A3
3A3

3A3

6BD4A

6BL7GT

6BL7GT

6BL7GT

6AN8
6CB6

6AL5
6AN8

6BY6

6BY6

6AN8
12BH7

I2BH7

12BH7

6BC7

19VP22

•MEASURED
f

MEASURED

T

MEASURED FROM
.MEASURED
NC-NO CONNECTION.
TP-TIE

POINT.

ALL

MEASUREMENTS

Pin

*f6ira
t3. 6Kn
f

3.

6Kf!

50KS2

50KSJ

27KSJ

.2n

ison

220n
flSKn

J6.

6Kn

750Kn

5.

5n

47Kn

Inf.

ISOKn

470KJJ
T350Kn
tL4Kn

I.

8Meg

27KSJ

TISKn

TP
TP

NC

NC

Inf.

PINS

PINS
T4SZ

lOOKn

IMeg

lOOKn
tllKn

3n

5D

T40Kn

2o<m

140

Jl

tSKSJ

t5.

2Kn

T5.

2Kn

t5.

2Kn

tlMeg

T20KS2

PIN

10

NC

IN

"UHF"

FROM

FROM

RESISTANCE

1

Pin

2

8. 2Kn

130KSJ

200KS3

62f!

62n

62n

ison

.20

8Kn

390Kn

T28Kn

750KS2

on

on

Inf.

820n

330n

2.

2Meg
IMeg

TSMeg

27KSJ

5Meg

.in
on

NC

NC

50Meg

1-8

HAVE

1-8

HAVE

Inf.

t!20Kn

lOKf!

f 3 .

2K!2

lOOMeg^
f!7Kn

.sn

150KJJ

loon

lOOf!

390Kfi

l.SMeg

1.

8Meg

1.

8Meg

t!2Kn

tlMeg

PIN 11

t!20Kn

POSITION.

POSITIVE

SIDE

POSITIVE

SIDE

PIN 3 OF

V25.

TAKEN

IN

.in

Inf.

tiixn

on
.in
on
.in

ti2Kn

tsson

3Kn

600

on
on
on

.

w

.in
.in

on
i.

3Kn
on
on

2. 2Kn

TP
TP

Inf.

Inf.

Inf.

NC

on

25Kn

on
on
.in
.in

i.

5n
on
on

6.

2Kn

450n

4

son

450n

on

t!20Kn

PIN 12

TlMeg

OF C2.
OF

"VHF"

MEASUREMENTS

Pin

3

Pin

A

Pin

5

Kn

INF

INF

Cl.

POSITION

on
on
.in
.in
on
.in
on
.in
.in

.
on
.

.in
.in
on
on
on
.in
on

3.

.

.in
ta.

ts.

NC

NC

50Meg

NC

60Kn

eoKn
eoKn

.in
on
on

.in
.in
.in
on
.in
.in
.in
on

tioicn

PIN 13

tioxn

on

.in

on

t

iixn
TiiKn
tUKn
TUKn

on

on

in

on

.in

in

on

f L 5Kn

?L5Kn

on

on

T2.

1K!J

.in

on

9Meg

tucn

1Q

4.

8Meg

.in

550Kn

2Kn

550Kn

2xn

t45n

t45n

Inf.

RESISTANCE

RESISTANCE

2.5Meg

f27Kn

t27Kn

t27Kn

on

t2.7Kn

lOOMeg

Of!

TlSKn

t8Kn

.in
.in
.in
.in
.in

tionn

PIN 14

t20Kn

UNLESS

OTHERWISE

Pin

8. 2Kn
Inf.

tl.3Kn

t47Kn

tiiKn
tiiKn

1

1.

3Kn

fi.

6Kn

t6Kn
tiiKn

300Kn

t 2. 7Kn

^

i.

5Kn

f

i.

5Kn
on
on

1

1.

5Kn

l-6Kn

NC

soon

on

t

leoKn

NC
NC

NC

NC
Inf.

NC

2. 2Kn

2. 2Kn

2.

2Kn

fi.

5Kn

f2.

7Kn

on

f2.

7Kn
t3.9Kn

f3.

9Kn

tiinn
tiiKn
tiiKn
tiiKn
ti7Kn

TlMeg i T120Kn

Pin

6

*t

6KO

aooKn

on
on
on
on
on
on
on

tsson
Tsoon

t 2. 7Kn

220n

on

44Kn

T

220Kn

470Kn

tlMeg

NC

.in

4.

8Meg

UOKn

on
.in

.in
.in

SOMeg

Inf.

.in
.in
.in

Ti.sKn

t!7K!2

lOOMeg

tiSKn

.ea

.

en

fsson
70on
70on

3.5Kn

TlMeg

!

DESIGNATED.

7

Pin

8

Pin

9

isn
on

Ti2Kn
tsson

2.

4.

.gn

470n

NC

2Meg

5Meg

on
WKn

. 2n
8Kn

22on

t

sson

220n

on
.

in

on

2. 2Kn

on
on
on
on
on

Inf.

NC

TOP

CAi

.95n

TOP CAP

SOMeg

TOP CAP

Inf.

TOP CAP

Inf.

on
on
on

T-16KS2

lOOMeg

IMeg

20on
2oon
20on
Ti2Kn

NC

f70on

sson

40on

on

on

on

tlMeg

SOMeg

PAGE

4

BOTTOM

CRF-IF

CHROMA REF.

s—^

V^X

CHROMA REF-

L4°

®

PHWE^ET

AGC

CLAMPER

QUADRATURE

"l"

SYNCHRONOUS

AFAMP

[6AV6 ) t6AQ5j

VIEW

CHASSIS)

OSC.

|~]

3.58

I

CRYSTAL

L38

OSC.

CONT.

A5§\)

CHROMA

QL37

AMP

CHROMA

BANDPASS

L35 0 (J2S

N_y

COLOR

KILLER

K^y

"Q"

SYNCHRONOUS

DET

''l"

(6AN6)

AUDIO OUTPUT

-r-

TUBE

PLACEMENT CHART

W

vs)

MIXER

RF

UHF

MIXER

UHF

TUNER

MC

/

SYI

AMP

VIDEO

L25 / \T

DET

"Q"

PHASE

AMP

X'

PHASE

,N.

^

^ ^ -"HORfZ

VIDEO

DET

5

1N60

L21

M6 ra

AMP ® ^-^

__

1NV

"~X

0

SYNC

AMP

HORIZ

SOUND

SYNC

TH

VIDEO

DETL|SM|3

SOUND

SEP

IF

X^N

IF 2ND

BLUE

BLUE

GREEN

GREEN

U2BH7)

RED

JfJD

4TH

L3J

ADDER

OUTPUT

ADDER

OUTPUT

OUTPUT

1ST

2ND

LI80 ( C5

\5CB6J

3RD

VIDEO

IF

SOUND

IF

GREEN,

VIDEO

IF

®

LI5

VIDEO

IF

/*

VIDEO

IF

RATIO

BLUE & REE

DC

RESTORER

"X

j

DET

HORIZ

SWEEP

FXUS

RECT

V24 \ V23

6CU6 J \6

HORIZ

OUTPt)T

/=\y

HV

RECT

HORIZ

OUTPIJT

vrv

^

HV

REGULATOR

SET 293

BOTTOM VIEW

(SWEEP

CHASSIS)

RED

CONV OUTPUT

BURST

AMP

KEYING

CONV

CATHODE

FOLLOWER

[6BL7GT

I

CRN

CONV

OUTPUT

CONV.

SAW

TOOTH

GEN.

g.

Mr

CONV

QMTPIJT

FOLDER

2

PAGE

5

The

high

voltage shock

8

(cathode)

of the

AC

line voltage

Allow

proper time

Connect

the

negative

Use

only

enough

Leads

between

Set the

channel selector

Connect

the

synchronized sweep voltage

DUMMY

ANTENNA
Direct

High
grounded tube
floating
tube
chassis.

"
»

"

High
of

6CL6

to

chassis.

High
of

6CB6

to

chassis.

High
of

6CB6

to

chassis.

High
grounded
floating
tube
chassis.

Remove

the AGC

Set the

channel

DUMMY

ANTENNA

High

.

001MFD

Low

"

This

portion

of the

field.

The

UHF

portion

in

the

field.

horizontal

should

for

receiver

lead

sweep

test

equipment

SWEEP

GENERATOR

COUPLING

side

to an un-

over converter

(V3) . Low

side

to pin 2

(V8) . Low

side

to pin 1

(V5).

side

to

(V4).

side

to an un-

tube shield

over converter

(V3) . Low

keying

selector

SIGNAL

GENERATOR

COUPLING

side

to

side

to

"

receiver

of

this receiver

hazard

may be

output

be

maintained

and

of a 4

volt

and

signal generator

and

between

any two

shield

side

to

'•

"

(grid)

side

(grid)

Low

-side

pin 1 (grid)

Low

side

side

to

tube

(V11A)

between

any two

point

<§>

chassis.

has

been properly aligned

ALIGNMENT

eliminated

tubes (V23

chassis

.

has

and

at

117V.

test

equipment

bias

supply

to the IF AGC

output

connections should

channels

from

the

SWEEP

GENERATOR

FREQUENCY
Not

used

"
"

44MC

(10MC

Swp)

"

from

its

socket.

channels.

SIGNAL
GENERATOR
FREQUENCY

4.

SMC

(Unmod)

been properly aligned

INSTRUCTIONS-READ

by

removing

the

V24) . Connect a 200S2,

to

warm-up.

for

usable

to

reduce

sweep generator

MARKER
GENERATOR
FREQUENCY

39.75MC
(Unmod)

47.25MC

41.25MC

41.25MC

41.25MC
(Unmod)

43.4MC

41.25MC
(Unmod)

41.7MC

45.75MC

41.7MC

45.0MC

41.7MC

45.75MC

41.

45.75MC

39.75MC

41.25MC

41.7MC

45.0MC

45.75MC

47.25MC

Remove

CHANNEL

Between

any two

channels

"

at the

horizontal multivibrator

VIDEO

IF

line. Connect

indication

be

shielded

the

possibility

to the

CHANNEL

Between

any two

channels

7MC

SOUND

fuse

(M4)

1

3C

probe

Common

DC

probe

plate)

Common

(

)C

probe

I

(

Common

VHF

TUNER

factory

UHF

TUNER

at the

factory

CAREFULLY

ALIGNMENT

"

IF A

CONNECT

of

and is

BEFORE

10

watt

resistor

the

positive lead

on

scope

and

and

kept

short

of

erroneous indications.

horizontal

input

CONNECT

SCOPE

Use

VTVM.

DC

probe

Common

DC

probe thru

detector

(Fig.

pin 5

(Plate)

(V7).

Common

chassis.

Vert. Amp.
point

<^>

to

chassis.

Vert. Amp.

(plate)

of

thru

detector (Fig.

Low

side

Vert. Amp.

<£>

. Low

chassis.

JGNMENT

(located

on

rear

ADIUST

VTVM ADJUST

to

point

<§> . A15,

to

chassis.

A17

to pin 7 A18

6AL5

(V15).

to

chassis.

to

point

•db

to

point

<^>

.

ALIGNMENT

very

stable.

ALIGNMENT

and is

very

ATTEMPTING ALIGNMENT

tube

(V22).

from

pin 8

of

to

as

possible.

of the

to

point

to

point

"

1) to

of

to

. Low

to pin 5

6CB6

to

chassis.

to
side

apron

Alignment

stable.

chassis.

oscilloscope

ADJUST

Al

<£>

<^>

A2.A3

A4
R25

A5

6CB6

to

R24

A6.A7

side

A8.A9,

AID

AU.A12

(V5),

7)

A13.A14

point

to

of

deflection

Attenuate

A16,

at

VTVM.

Adjust
reading
setting. Replace V11B
(fuse)

of the

Alignment

VTVM.

. A19

Remove

the

V23 and V24 to

in

ground

ofor

horizontal

Attenuate
more than
MINIMUM

Detune

slug

several

turns counter

R25

for

MINIMUM

Adjust

for

Attenuate

more

than
generator
generator
output

of

generator.

reading

as

ator

was

set

Use

only
usable pattern
curve

similar

Adjust

for

Fig.

3.

Adjust

for

Fig.

4.

Adjust

for

Fig.

5.

Check

for

If

necessary,

obtain

correct
positions.
sweep generator

41.25MC

and
necessary,
200S2,

10

V23

and

V24,

of

V23 and V24 to

over

converter tube.

chassis.).

generator

output

Adjust

for

maximum

for

zero reading. A positive

will

be

obtained

set.

portion

if not

recommended

of

this portion

connection

chassis

signal

-2
deflection.

adjustment

MINIMUM

signal

-0.3

set at
for

obtained

for

enough

flat-topped response

flat-topped

flat-topped

response

Repeat

repeat

watt

REMARKS

on

in its

is not

from

ground.

deflection.

REMARKS

generator

volts

at

VTVM. Adjust

»

(A5)

clockwise.

deflection.

deflection.

generator

volts

at

VTVM

43.4MC.

41.25MC.

Do not
Adjust
on

VTVM

43.4MC.
sweep generator

on

scope.

Adjust

to

Fig.

2,

response

response

curve

retouch

A8, A9 and A10 to

response

and

steps

5 and 6.

output

to

39.75MC

trap

steps 1 thru

resistor

from

and

chassis.
chassis.

Remove

for not

more than

deflection.

and

either side

socket. Replace

in the

recommended

output

Then

similar

observe

of the

pin

output

for not

by

turning

Adjust

for not

with

set

change

R24 for

when

output

for

similar

similar

similar

to

marker

Increase

47.25MC,

markers.

4.

Remove

pin 8 of
Reconnect
Replace

bias

supply.

-2

negative

correct

M4

for

signal

signal

exact

gener-

for

response

to

to

to

Fig.

If

pin 8

shield

volts

ALIGNMENT

I

IOOK

rA/vVr—

SCOPE.

_l

<>

OR

"~~IOOO>DO

VTVM " I " MMF

F

IG.2

F

IG.4

6.

FIG.

>

I

FIG

FIG.7

F

1C

PAGE

6

IRE

ATTEMPTING ALIGNMENT

tor

tube

(V22).

>r

from

:

lead

•VM.

as

possible

indications,

t

of the

ECT

PE

)

point
point

iru
Ig.

1) to

)

of

ion

.

to

Low

to pin 5
:B6
ir

(Fig.

chassis.

Remove

pin 8 of V23 and V24 to

to

chassis.

.

oscilloscope

<^>

<^>

6CB6

to

side

(V5),

7)

ADJUST

Al

A2,A3

A4
R25

A5

B24

A6.A7

A8.A9,

A10

All,

A12

A13.A14

ofor

the

ground

connection

chassis

ground.

horizontal deflection.

Attenuate

signal
more
MINIMUM

Detune
several
R25

for

Adjust

Attenuate
more
generator
generator
output
reading
ator

was

Use

only
usable pattern
curve

Adjust

Fig.

3.

Adjust

Fig.

4.

Adjust

Fig.

5.

generator

than

-2

volts

deflection.

slug

adjustment
turns counter
MINIMUM

for

MINIMUM

signal

generator

than

-0.3 volts

set at

43.4MC.

for

41.25MC.

of

generator.

as

obtained

set

for

43.4MC.

enough

sweep

on

similar

to

Fig.

for

flat-topped response

for

flat-topped response similar

for

flat-topped response

from

REMARKS

at

VTVM.

"

(A5)

clockwise.

deflection.

deflection.

at

VTVM

Do not
Adjust
on

VTVM

generator

scope.

Adjust

2.

output

by

output

Then

R24

pin

Adjust

turning

with

set

change

for

when

for

similar

similar

for not

for

Adjust

for not

signal

signal

exact

gener-

output

response

for

to

to

to

ALIGNMENT INSTRUCTIONS

270

MMF

IN64

RECIEVER

F

IG.3

F

IG.5

OR

"±^K)OO>IOOK"

VTVM

^^

F

IG.2

F

IG.4

IOOK

IvIvlF

FIG.

I

Remove

negative
Connect
Turn

the

If a separate

Connect

DUMMY

ANTENNA

15.

.005MFD

Connect a 500MMF
Leave

bias

Use

only

DUMMY

ANTENNA

16

.005MFD

Tune

in a
chroma
Turn

brightness control
color

bars.

DUMMY

ANTENNA

17.

18.

19.

20.

Direct

21

22

fuse

(M4)

(located

lead

of a 30V

the

positive lead

contrast control

marker generator

the

synchronized sweep voltage

High

side

of

6CL6

to

chassis.

connected

enough

High
of

6CL6

to

chassis

local

black

control

and

Use

color
Connect
terminals.

bias

to
(R2)

SWEEP

GENERATOR

COUPLING

to pin 2

(V9) . Low

mica capacitor

as

under

signal

generator

SIGNAL

GENERATOR

COUPLING

side

to pin 2

(V9).

Low

.

and

white

contrast control

for low

SWEEP

GENERATOR

COUPLING

bar

generator.

across

on
supply

chassis.

(grid)

antenna

rear

apron

to pin 2

and the

is

used,

side

between

"Bandpass

frequency

(grid)

side

TV

station.

brightness.

of

deflection

(grid)

chroma

control

couple

it

from

the

SWEEP
GENERATOR
FREQUENCY

SMC
(SMC

Swp)

pin 6

Amplifier

for

usable

SIGNAL
GENERATOR
FREQUENCY

3.58MC
(Unmod)

Adjust

to

their mid-range

Connect

SWEEP
GENERATOR
FREQUENCY

Not

used

"

"

of

6AN8

loosely

sweep

MARKE
GENERA!
FREQUES

2.2MC

2.4MC

4.

4.4MC

4.

(plate)

Alignn

CHANNE

Between

any two

channels

contrast

a col

MARKE
GENERA'

FREQUEh

Not

chas

(R4/

IMC
SMC

of

indi

pot

us

"
"

p

1

ge

to

point

'

side

to

apron

ADJUST

A15,

A16,

A17

A18

A19

Alignment

;table.

Alignment

of

deflection

Attenuate
at

VTVM.

Adjust
reading will
setting. Replace

(fuse)

of the

Check

for

response curve

If

necessary,

obtain

correct response

positions.

Repeat steps

sweep generator

41.25MC

and

necessary,

repeat

20Cm,

10

watt

V23

and

V24,

of

V23 and V24 to

over converter tube.

chassis.).

generator

output

Adjust

for

maximum

for

zero reading. A positive

be

obtained

V11B

if not

portion

in

recommended

is not

in

set.

portion

of

this

retouch

A8,

output

39.75MC
steps 1 thru

resistor

from

and

chassis.
chassis.

Remove

REMARKS

for not

more than

deflection.

on

either side

its

socket. Replace

recommended

similar

A9 and A10 to

and

marker

5 and 6.

to

observe

trap

markers.

4.

pin 8 of
Reconnect
Replace shield

bias supply.

and

negative

of the

in the

to

Fig.

Increase

47.25MC,
If

Remove

pin 8

-2

volts

correct

M4

6.

F

IG.6

IOOK

FIG.7

F

IG.8

23

24

Connect a 100%
selector

DUMMY

ANTENNA

25

Direct

26

27

"

28

Use

color
Connect
terminals.

for

"Q"

Connect
ator

across
minals.

for

"I"

saturated color

to

receive color

Use

color
Connect

terminals

bar

generator.

across

Set

generator

signal.
color

bar

antenna ter-

Set

generator

signal.

bars . Adjust

SWEEP

GENERATOR

COUPLING

bar

generator

across

.

"

antenna

gener-

bar

antenna

generator

contrast,

SWEEP

GENERATOR

FREQUENCY

to

antenna

hue

MARKI
GENERA
FREQUEb

rangi

te:

T

INSTRUCTIONS

F

IG.3

F

IG.5

IG.6

270

MMF

TO

RECIEVER

IN64>

220

r>.

FIG.8

Remove

fuse

lead

the

positive lead

the

contrast control

the

synchronized

High
of
to

bias

connected

only

enough

High
of
to

in a

ocal

control
brightness
bars

.

(M4)

of a 30V

GENERATOR

COUPLING

side
6CL6
chassis.

signal generator

GENERATOR

COUPLING

side

6CL6 (V9).

chassis

black

and

control

GENERATOR

COUPLING

negative
Connect
Turn
If a separate marker generator
Connect

DUMMY

ANTENNA

15.

.005MFD

Connect a 500MMF
Leave
Use

DUMMY

ANTENNA

16

.005MFD

Tune
chroma
Turn
color

DUMMY

ANTENNA

17.

18.

19.

Direct

Use

20.

color
Connect
ter m Inals

21

22

Use

23

24

Connect a 100%
selector

DUMMY

ANTENNA
Direct

25.

color
Connect
terminals.
for

"Q"

Connect
ator

across
minals.
for

"I"

saturated

to

receive color

Use

color

Connect
terminals.

signal.

GENERATOR

26

27

28

(located

on

rear

bias

supply

to

chassis.

(R2)

and the

sweep

SWEEP

to pin 2

(grid)

(V9).

Low

side

mica

capacitor

as

under

"Bandpass

SIGNAL

to pin 2

(grid)

Low

side

.

and

white

contrast control

for low

SWEEP

bar

generator.

across

antenna

.

bar

generator.

across

antenna

Set

generator

signal.

color

bar

gener-

antenna ter-

Set

generator

color

bars.

SWEEP

COUPLING

bar

generator

across

antenna

apron

of

deflection

to pin 2

(grid)

chroma

is

used,

couple

voltage

from

the

SWEEP

GENERATOR

FREQUENCY

SMC
(3MC

Swp)

between

pin 6

Amplifier

frequency

for

SIGNAL
GENERATOR
FREQUENCY

3.58MC
(Unmod)

TV

station.

Adjust

to

their mid-range position.

brightness.

bar

GENERATOR

FREQUENCY
Not

generator

Adjust

GENERATOR
FREQUENCY

Connect a color

SWEEP

used

"

to

contrast,

SWEEP

BANDPASS

Unless

(V34B).

fully

to pin 2 of V9.

generator

CHANNEL

Between

any two

channels

3.58MC

of

V12B

and pin 2

C

I

"ig.7)

C

ommon

COLOR

and

brightness controls

bar

CHANNEL

used

any two

channels

"

Channel
of
bar
ator.

Channel
color
generator

MATRIX

AMPLIFIER

set has a

clockwise.

to

horizontal

TRAP

on

VTVM.

CONNECT

VTVM

probe thru detector

to

point

to

chassis.

AFC

ALIGNMENT

generator

Between

"

color

gener-

of

bar

(Q"

Signal

Channel
of

color

bar

gener-

ator

"I"

signal

ADJUSTMENT

or

tune
and

CHANNEL

Channel
of

color

bar

gener

ator

chassis).

of

6AN8

control

(R4A)

it

loosely

sweep

MARKER
GENERATOR
FREQUENCY

2.2MC

2.4MC

4.

IMC

4.4MC

4.

SMC

(plate)

Alignment". Turn contrast control

usable

Indication

CHANNEL

Between

any

two (

channels

contrast

MARKER

GENERATOR

FREQUENCY

Not

antenna terminals

hue

range trimmer

MARKER

GENERATOR

FREQUENCY

ALIGNMENT

color

input

CONNECT

SCOPE

Vert. Amp.
detector

(Fig.

pin 2

(cathode)

6BY6

(V38).

side

to

chassis.

ALIGNMENT

(grid)

of V9.

<g>

.

for a

across

antenna

CONNECT

SCOPE

Use

VTVM.

DC

probe

to pin 7

(plate)

of

6AL5

Common

to

DC

probe

to

do . Common

chassis.

Vert. Amp.

<p . Low

chassis.

Vert.

Amp.

<J>

. Low

chassis.

in a

station broadcasting

chroma

controls

CONNECT

SCOPE

Vert. Amp.
12

(blue

grid)

picture

tube

Low

side

to

"

Vert.

Amp.

2

(red grid)

ture

tube

(V45) . Low

side

to

chassis.

Vert. Amp.
6

(green

grid)
picture tube.
side

to

chassis.

killer

switch

to

of the

oscilloscope

ADJUST

thru

Low

fully

ADJUST

A24

chassis.

point

of

A20,
A21,

7) to

A22,

of

A23

clockwise.

Adjust

1

Replace

of

V12B

normal picture.

terminals,

set

ADJUST

A25

(V36)

A26

A27

A28,
A29

A30

R26

to

Hue

to

point

Range

side

to

Trimmer

to

point

A27

side

to

on

to

to pin

of
(V45).
chassis.

to pin

pic-

to pin

of

Low

NTSC

their mid-range position.

ADJUST

R4A

R27

open

color

killer

for

horizontal

Adjust
sponse
to

place

high

frequency

and

A22

Remove

M4

for

MINIMUM

M4 in

fuse

and pin 2 of V9.

Then

preset

channel

selector

Adjust
on

VTVM
clockwise until reading
sharply
clockwise until reading
maximum
maximum

Adjust

Adjust

Connect a clip
chassis.
deflection.

V12B.

Connect a clip
chassis.
almost
Color
retouch

Connect a 10MMF
crystal
ance

control
VTVM.
across

Switch
signal
to on
for

zero

Switch
generator.
position.

indication

color

bar

Adjust

maximum

bars.

Adjust

cancellation
26

for

and

red.

Check
cyan

bars.

Check
blue

bars.

matrix
cellation

circuit, connect

deflection.

REMARKS

A20, A21,

A22 and A23 for re-

curve

similar

4.

5MC

in

trap

side

of

affects

bandwidth

from

fuse

holder.

REMARKS

deflection.

holder.

Remove 500MMF

hue

range trimmer,

to

receive

REMARKS

A25

counter

drops

to

-2.5

to -7

volts.

deflection
reading

on

for

maximum

for

MINIMUM

lead

from

Adjust

A28 and

Remove

lead

from

Adjust

A30

In

sync.

Remove

bars

should

fall

A30.

capacitor

(M16).

Adjust

(R26)

for

Remove

10MMF

M16.
off the "I"

channel

generator.

Adjust

"Q"

indication

off "Q"

channel

Switch

Readjust

on

scope.

signal.

the

chroma control

cancellation

the "I"

gain

of

red. Repeat

cancellation

cancellation

If

necessary,

adjustment

is

obtained.

Switch

the
A27 for

Set

REMARKS

of

of

until

position.

best cancellation

the

to

Fig.

8.

notch . A23

response curve.

and

tilt.

Remove

bias

clockwise

until reading

volts.

Then

on

VTVM

Continue

adjusting

passes

and

falls 2 volts

VTVM.

deflection.

deflection.

pin

8 of

A2 9 for

short

from

point

<&>

until

color

short

point

in

sync,

across

the

color

AFC

zero

reading

capacitor

of the

the "Q"

hue

range trimmer

on

scope.

of

color

"I"

channel

zero

channel

(R4A)

of

green

control

for

best

steps

of

green, yellow

green, blue

red, magenta

repeat

best

overall

Adjust

affects

supply

from

adjust

rises

thru

V12B

maximum

pin 8 of

to

bare

are

^p

if not

3.58

on

from

color

channel

signal

to on

"I"

for

and

yellow

25 and

and

and

entire

can-

A20

A21

pin

below

to

bal-

r

v
«

F

C
r

C

o

3

c

n
C

.

K

C
d

f

K
C

u

r

K

PAGE

7

L®2

OSC

(eue.1-

MIXER

RFAMP

PICTURE

19VP22

CHROMA
V45

TUBE

CHROMA

REF.

TOP

(RF-IF

REF

OSC.

VIEW

CHASSIS)

OSC.

CONT.

TUBE

PLACEMENT CHART

A/3'
(6AN8J

AGC

KEYING

HORIZ

SYNC

SEP

4TH

VIDEO

IF 1ST

SOUND

IF

BLUE

BLUE

ADDER GREEN ADDER

'V4^\\)

RED

U2BH7)

OUTPUT GREEN OUTPUT

INDICATES BLANK

PIN OR

LOCATING

ADDER

RED

KEY ON

OUTPUT

TUBE SOCKET

CONV

BLUE

SAW

TOOTH

CONV OUTPUT

HV

REGULATOR

CONV CATHODE FOLLOWER

GEN.

V29
3A3

6BC7)

GREEN,

BLUE

& RED DC

RESTORER

TOP

VIEW

(SWEEP

CHASSIS)

RED

COW

OUTPUT

INDICATES

BLANK

PIN OR

LOCATING

KEY

ON

TUBE SOCKET

0

SYNC

,

VI9*

(I2AT7

PHASE

INV

PAGES

3^,-iw-(6AU4CT)

125V

V

J

SLO

BLO

X

HORIZ

SWEEP

3AG-5A-I25V

SLO

BLO

LV

SUPPLY

!

IM

'

3