Sencore CG159 Service Manual

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CG

159

DETUXE

COTOR

GENERATOR

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]VIANLJAL

SAFETY

PRECAUTIONS

When testing
expected
ment.
working

1.

An
the

2.

When
power,

ment or
caucionand standonaninsulatedfloor

3. Dischargefiltercapacitorsbefore connecting test leads
acitors

4. Be sure
can
potentials.

Remove the test

5.
reduce

Do not work

6.
another

shock

against

electronic

high voltages

The

technician

on

isolation

chassis tied to one side of the

be

observe the

and

transformer should always be used

making test

if thiscannotbedone,

metal

can store
your

extremely dangerous and can

possibility

the

alone

person

can

be the

ttre equipment, or

equipment, there is

present

can be

should become

following

lead connections to high voltage

objects.

equipment

leads immediately

close by in case of

Place

charge

a

is in

of shock.

when working

cause of a more serious

be sure to

one

that

good

coming

at unusual

familiar

precautions.

power

AC

hand

to reduce the

could

order. Broken or

expose

after

hazardous

on

accident.

in contact

always

locations in

avoid

you pocket

in

dangerous to the technician.

be

thetesthasbeen

dangerpresent. Un-

a

with the device

on equipment

line.

points,

contact

the

Remember,

accident,

with higher voltages.

with other
as

possibility

frayed

technician

circuits.

defective

that he is

remove

safety

a

of shock.

to them.

test leads

to dangerous

completed to

Always

evenaminor

such as

equip-

having

the

equip-

pre-

Cap-

have

falling

TABLE

OF

CONTENTS

PAGE

SAFETY
DESCRIP|ION
SPECIFICATIONS

PRECAUTIONS

OPERATION

Controls
Operating

APPLICATION

Setting up
Checking
Checking
Color TV
Demodulator

Determining
The

MAINTENANCE.

Disassemblyinstructions
Timer Controls
Timer
Making
Circuit
Trouble
Schematic

on the Color

Color

the

and trouble- shooting wirh

and

Adjusting

the

Static

rrouble-

Phasing

With

With

Color

Color King

Adjusunent Procedure

Internal
Description

Chart.

and

King

King

Purity.
Dynamic

and

shooting

Check

Scope.

Vector scope

Sync capabilities.

produces

.

Adjusunents

Parts

List

aoaa

the Color King

Convergence

; .

standard Color

.
.

(separate

Bars

sheet)

.

i

aa

. . .

.

o .

.

.

2

4
4
5

D

7
8

8
9
10
11
15
15
16
16
16

T7

.

L7

18

18
L9
2L
23

ILLUSTRATIONS AND CHARTS

Fig. I
Fig.
Fig. 3
Fig. 4
Fig.
Fig. 6
Fig.
Fig.
Fig.

Fig.
Fig. 11
Fig. 12 - PC

-

Rear View of Color

-

2

Crosshatch

-

Two-stage

-

RCA Bandpass

-

Waveform

5

-

High

-

7

Scope displays

-

8

Ideal

-

Standard color

9

circuits

-

10

Standard color

-

RF Trimmer location.

Board

at

level demodulator

vector display on Vectorscope

layout

pattern.

Zenirh

Bandpass

amplifier

plate

of burst amplifier.

at Red, Green

bar scope

pattern

bar

tube bases.

amplifier.

used in Color TV

Blue CRT control

and

waveform found

in chroma

grids.

PAGE

9
9
L2
13
13
T4
L4
15

15
T7
20
20

King in

new

The
ending search
Sencore
was obtainable
The
controlled
daily

engineers

Perma l-ock

new

temperature

use in all

OPERATING

FOR

COLOR

KING III

DESCRIPTION

color bar

for

better

have

with simplicity

kinds of

generators,

products for

devised

circuits along

control

weather and

INSTRUCTIONS

COLOR

CG159 is

the

electronic

the

Color

CG159

GENERATOR

circuits

exclusive

King III the

extremes.

result

the
maintenance

of an

ever before

than

thermostatically

generator for

industry.

THE SENCORE

DELUXE

the

even more stable

inmindforgreaterdependabilityinoperation.

with

make the

temperature

never

panel

The Dot size
channel

6.
Here are

Ten Standard

stalcontro1ledkeyedbars(with30degreephase

change between
magizines,

Adjustable
gence,

is adjustable
Crosshatch

@entson

Vertical

convergence.

Single

ffil

Single

is adjustable

selection

the seven

Size

are

and

Line

Pattern: Single

Dot

switch

Color

each ) as

offers

White

creaffiyE-all

from the

Pattern: The basic

Horizontal

Crosshatch

standard

Bars:

a

from

covers

patterns

The type andphase

explained in almost

complete

New stabilized

Dots:

front of the unit.

the

Bars:

P-attern:

lines that

dot

front

the

entire low VHF band,

the

provided

gamut

new Sencore

convergencepattern.

TVreceiver

An added

Fasterconvergence is

for fast DC convergence at

of

can

colors

be

of the

by the

thathas

for every color

dots, a

counting

feature to

moved anywhere

SPECIFICATIO N S

RF

Output:

Front

panel

switching

of

any

low band

Color

Color

nowbecome

service

all

must

circuits.

Also

help speed

channel

King and

channel2

for

used

possible with

center

2 - 6-

to

Kinggenerator.

the stand-

l iterature

circuit

static

The dot size

for

overscan

dynamic

up

on the

of screen.

the RF

channel

and

test.

conver-

single

screen.

Modulation:

Vertical

Bars,

Any one

Horizontal

of seven

Bars, Single

patterns:

Crosshatch,

Color

Bars,

Single

Dots,

Dot.

Crosshatch,

9.yrt"t

T@s,

C.-pt*ent:

-

189 KHz

I

I

-

4.5 MFlz

!.00S/ofortimersand

for

sound carrier.

-

3563.795

1

KtIz

Semiconductor
2 - 1M695,

Power:

Size:

Net Weight: 9

L ' 12 Volt

-

105

I0-L/4 x

f

pounds

Complement:

zener diode

25

VAC l}/ffi

4

9-L/2x

inches

-

2N517 2,

14

Hertz,

I - 8 volt

and

30 watts

-

2N4248,

4

I

zener

-

2N52
diode.

OPERATION

THE COTOR KING

CONTROTS

The Color King has three maincontrols. The TVCHANNEL

PATTERN

the
subcontrols, the
HORIZ

justrnent

near
The TEMP CONTROL light is a heating element

a
Pattern

;Elffimposite

willnotjumporfalloutof
The

CTR controls

and the

the bottom of

thermostat

Switch: The

following

ON

switch and the

4.

MHz

5

for

the single line

timer

adjustrnents are alsoavailableas secondarycontrols

panel.

the

for

cold weather

Pattern

sync is

patterns

fed

sync,

are available on the Color King.

COLOR

sound

operation.

syitch

to the modulator

when

OUTPUT control. There

carrier

and

selects one of the

switching

switch

and the VERT CTR and

patterns.

dot

automatically controlled

seven

time3,

at all

from

one

pattern

27

selector

The dot

patterns

that

so

5-

,

the

to

are

1N34A,

switch,

three

size ad-

with

avail-

patterns

another.

Dots: There

l.

T6,r

nC convergence.

have white dots

s€une spot
small

plus

the

2.

Single
DC

convergence

Crosshatch:

3.

Ifies

dynamic

width)

LL7

are

in the center

on the CRT). Static

magnets,

blue

Dot:

visible

are

convergence

and

spaced

lateral

A single dot with

possible

In the crosshatch

on

for

linearity

size dots

small

A color TV

L20

at

positioning

-

only one dot

the CRT scieen.

adjustrnents, over scan

adjustrnents.

that

are adjustab'le in size,

set, that is

of the screen

orDCconvergenceiscontrolledbythree

degrees
magnet.

adjustable

position,

position

to

Thecrosshatchpatternisusedfor

properlyconveiged,

(all

three

around

9

the neck of the CRT,

isprovidedforeasiest

look

at.

vertical

and

adjusunents

guns

13

primarily

will

hitting the

horizontal

(height

and

4.
is
vents confusion. Also used
adjust

Single

provided

Crosshatch:

for easiest

purity.

A single

dynamic

crosshatch,

convergence

for

centering

each line

possible

purity

position

-

one

magnets when

ring

adjustable,

pre-

line

5. Vertical Bars: 9 vertical

m@marilyusedwhenadjustingthedynamicverticalconver-

gence.
Horizontal

6.

ffibarposition.Theseareprimarilyusedforthehoriz.

ontal dynamic

7. Ten Color Bars:

@inthecolorcircuitsoftheTVreceiver.Thecolor

output is
displayed on a
front

Color Output

signal that is

sync abilities
most receivers, the
will

lose

pole

effect)

is used to
TV Channel

@1insertion.Inusetheswitchshouldbesettoanyun-

used channel in an
Vertical

cl.ossfiffi-Fattern to the left
right.

controlled with a separate

panel.

Control:

fed

of the receiver. A setting

color sync. This

within

force

Selector:

Line: Theverticallinecontrolmovesthe

13horizontalbarsare

Bars:

convergence.

10

normal

Thecolor oulput control

modulator.

to the

control

each

defective

a

The

area.

bars are

color bars are

set are shown on the

can beturnedtoalmost0

is indicated

color bar.

set to sync while

TV channel

right

or

visible

control. The colors which

It is

by diagonal bands of

The

selector

or moves

in the vertical bar

visible on

generated

primarily

of

200 percent

for

pattern

changes the amount of

used to check the color

percent

100

percent

trouble-shooting.

wi/l

vertical line in the single

the single

position.

TV

the

color

setting

select any

screen,

alignment

will

indicating strip on

normal. Wittt

is

before the set

(barber

color
of

control

the

low

dot

to the

leftbr

when

and

be

color

band

Horizontal

@hpatternupordownormoVesthesingledotupordown.

Power

ffieffi?Klng is completely

patterns

Sound

sound'
primarily

analyze and trouble-shoot the

Line:

Switch: The

to completely

Carrier: The
ca;m-er

to

The horizontaltine

into the RF signal

insure

power

stabilize

sound

proper

switch

solid

on the

carrier

tuning

audio

controlmoves

is used

state, it will

switch is

from

to

screen

the Color King.
of the TV
circuits.

horizontal line

the

rurn the unit ON. Even

take about

of the TV

used to insert

set, but can

3

receiver.

the

This signal

seconds

4.5

megaheru

also be

in the

though

for

ls

used

used

rfie

to

TEMP
element
indicator
come
lowandwill

CONTROL:

in the

next

on whenthetemperatureinside

shutoff

Color

to

the

The

Sjng

OFF-ON

when

TEMP

is

on.

fhe

internal

CONTROL

It

should

switch.

the

temperaturels

The

unit

indicator

not

be confused

TEMP

CONTROL

is

approximately

tells when

approximately

the heating

with

indicaror

85o

the

p

po*"i

or be-

1l0o

will

F.

If theColorKingisbroughtinside
temperatures
the

internal
When first
very

rapidly

The

timers

range

so

cause

the Color

OPERATING

To

use

the Color
antenna lead
to

the

sarne channel

switch
Sharp well-defined

for
quality

discuss
steps,
terminals,

Fin-e.funing:.
oscillator.
bone
until
MegaherE
for
andwhitepatterns
(
slightly

Contrast

contrast

convergence
patternandthebackgroundlevel.

to near

the
desirable
zero.

to

trouble-

and sharpness

the

pattern)

ttre herringbone

the TV

dot

brightness

to

ma:<imum.

sizeof

the

TEMP

temperature

turned

it is

on the

once

the

are factory

almost

King

THE

King

to

the

antenna

the

desired

patterns

shooting.

b4efiy

and B.tghtnett

and brightness

how

Color

King

and

the TV

the

Tu.n

f'djust

oscillator

and

favor

thedot

to elimihate

the

is

seen

the

control

also.
v_ers,us
the

adjustrnents

on

ison

dot

On
the

CONTROL

reaches
Limers

temperature

adjusted

impossible

timers

COTOR

simply

terminals

you

have

pattern.

are necessary

Since

of

the

these

TV

and ttre

set

tuned

Color

King

TVfinetuning

in

the color

just

effect

can

now

should

Occasionally,

background)

frequency.

Controlr:

controls

it is desirable

dots,

screen.

the

Y

and

iq{icator

100u

may

starts

towards

to find

to

become

KING

turn

the

the

Color

the

seftings

pafterns

controls

outputcable

to

to color

bars.

disappears,

be

turned

be left

Because

'

on

can

Inthis

the

increase

When

signat.

used

after

F,

usually

not

be

to

rise.

the high

a temperature

unstable.

power

on

the TV

King

for
of the

produced

should

isconnected

the

s€une

bars

control

however,

can

any of

be

until

Backoff

off.

at rhis

be

the Color

the

set

to

to have

case,

of contrast

viewing

Simply

or

achievEO

being

will

stabilized,

switch

convergence

and turnon

.This

the contrast

color
turn

subjected

come

on

after

end

of

condition

to

ON

receiver.

tuned

to.

TV

Controls

by

the

Color King,

be ser.

channel

a9?-O' KHz

the TVfine

is

at a minimum.

is

the

serting

a

patterns,

your

a

highei

Kinghas

liking.

high

may

bars,

the

for

ny detuning

contrast

to very

and

sray

on unril

several minutes.

will

but

ttre

and connect

Tunb

Turn

adjustrnents

In

all thJfoilowing

to

the TV

as the Color

the 4.

best

all of

dot

the

should

tend

it is

contrast

s tabilize

temperature

that would

the TV

pattern

the

will

affect

we

antenni

King.

5 Megahertz

beat

ft6rring-

tuningconff;l

The 4.5

tuningpoint

the

black

conrastrange

ttre

been

designed

seming"oTthe

Howeier,

berween

be

urned

to increase

sometimes

control

low

the
set

and

rhe

will

fV

for
gtre

to

TV sets

Vertical

GffifroidTsnotadjustedproperly,

part

number

Horizontal

ffiesatthetopofthepicture.Thiswilloccurifthehorizontal

hold
adjusting
this

Hold: All

of the

of retrace

Hold:

control is

the

effect.

picture

horizontal

color

Adjust

lines,

On some setstheremaybe

properly

not

the

consistent

adjusted.

hold control.

have vertical

retrace

vertical

hold control,

good

with

These can virtually be

A high contrast

retrace

lines can be

vertical

a slight

"fanning"

setting

hold.

APPTICATION

blanking.

seen

for the

or

eliminated by

may also

If the

in the

minimum

"bending"

upper

cause

AND

SETTING
WITH

Sbrring
addition
followed

twocatagories,

into

that

and
catagory

COLOR
The setup

following

the

Checkandset

1.
adjustedwithagoodhighimpedencemeter
meter

2. Check and adjust
pattern

3. Check and
bars
for

4. Check the
the best

UP

COLOR

THE

up and

to a

TV SETUP

this.

trouble-

good generator,

so that

which requires

has a

time

different

convergence

or

procedure

greatest

for

your

of

pdjust

the output

and

static

pattern

the

thatwhichrequires

generator for

TROUBLE-SHOOTING

KING

shooting

will not

trouble-shooting

procedure

should be

high voltage if

accuracy.

the

the

control reduced

convergence

to

use.

color

however, an

wasted. The color

be

the color

of

height

purity

TV is

setup only,

follow

to

TV is usually

followed

necessary.

linearity.

and

check.

this

necessary.

if

magnets.

easy with the

established

usually

eliminate

to

eliminate

to

such as a Sencore

You can

The Coloi

"0"

to

or the blank raster

Here the single

set

usually

done on

done

high voltage

The

procedure

wasted

Color

can be

done

bench.

the

wasted

the

in

the

use

rcing set to

dot

King. In

should

broken

the

in

dme.

home

time:

should be

Field

crosshatch

is ideal

centered

be

down

home

Each

and

Effect

color

is

5.

Adjust

screen.

the dynamic

convergence

controls

for

remaining

the

parts

of

the

If
purity

have
TV

Let's
on

may
dotsinsteadofjusttheirowncolor).
patterns

sentable,

switch
first
can see

high

the

voltage

is adjusted

to be repeated

receiver.

seehow

it's side

go

(electron

off

or

from

andyoumaynot

to color

impression

the importance

is not

set

properly

after convergence,

this

even

the

works

as all of

tilted up

beams

Color King

these will

with

the

as

from

(dots,

be

able to detect

bars, the colors will

would

be to

start

of checking for

the entire

following

little

as

gunwill

each

Under

crosshatch,

be strange

analyzing

proper

to

begin with

convergence

affect the convergence

example.

30

degrees,

hit

all three

thiscondition,

etc. ) will look

anything

wrong. However,

or completely

the color

purity

CHECKING AND ADJUSTING PURITY

or

the linearity

procedure

or the

will

of the color

If a color

the

the black

circuits. Thus,

purity
colors

gone,

set is

tilted

of the CRT

phosper

of

white

and

quite

pre-

you

if

your

and

you

and convergence first.

Theadjustrnentof.purityisimportant,
receivers.
canbeused.
position.
it to the

COLOR

the
position.

receiver.

the
the screen
the single cross hatch

purity
rings

and

TGREEN

GRIO

If the receiver has

Some receivers do not have

You

can use

the

Color

antenna terminals

OUTPUT

You will
for

adjusting the

now have

There

control

are some cases

puritymagnets

pattern

yoke

Follow
for

best

2 RED

7

€REEN 6RID

14

ELUE

GNID

2 REO

the manufacturersprocedurefor

results.

GRID

RECTANGULAR

GRIO

rings.

and setting it

fully

clean

a

for

STAt{DARO

t5|tP?2

especiallyin

a set

up switch with

this

King

to obtain

switch or do not have

a blank raster

to the Color

counter

blank

where

clockwise
raster for

you

and the

fire

this adjustrnent for

GRIO

GRIO

the new

purity

a

Bar

to the

setting of

wish

to

ball.

precise

setting of the

rectangular

position,

connecting

by

position.

BLANK

the

know

the center of

you

Here

setting of the

color

this

purity

a

Rotate

RASTER

purity

may

use

purity

of

Fig. I - Reor View

of

Color tube

boses Fig.

-

2

Crosshotch

pottern