GE Photofact Folder 21C115 Montageanleitung

PHOTO

FACT*

Fold

GENERALELECTRIC

MODELS

21C115,

21T14

(Ch.

21TF)

VOLUME

CONTROL

ON-OFF

FINE

TUNING

CONTRAST

CONTROL

VERT.

HOLD

CONTROLBRIGHTNESS

CONTROL

CHANNEL

SELECTOR

GENERAL

ELECTRIC

MODEL

21X14

TRADE

NAME

GeneralElectric

Models

21C115,

21T14(Ch.

21TF)

MANUFACTURER

GeneralElectric

Co.,

Electronics

Dept.,

ElectronicsPark,Syracuse,

N.Y.

TYPE

SET

Television

Receiver

TUBES

Twenty-one

POWERSUPPLY

110-120Volts

AC-60

cycle

RATING

1.92

Amp.

(a)117

Volts

TUNINGRANGE—

Channels

thru

13,

Video

IF45.

75MC,

Sound

IF45.

75MC,

Sound

IF41.

25MC

(Intercarrier)

INDEX

Alignment

Instructions

6,7

Photographs

(Cont)

DisassemblyInstructions

..,.-.

Trans.,

Inductor

Alignment

Identification

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

Horizontal

Sweep

Circuit

Adjustments

ResistanceMeasurements

Parts

List

and

Descriptions

14,

15,

Servicing

inthe

Field

PhotographsSchematic

Cabinet-Rear

View

Terminal

LocationChart

Capacitor

Identification

4,9

Trouble

Shooting

Aids

, 12,17

Chassis-Top

View

Tube

Failure

Check

Chart

......

. ,

Tuner

Tube

PlacementChart

(Bottom

View)

Resistor

Identification

19,20

TubePlacementChart(Top

View)

™

ft m

-I—

—

HOWARD

SAMS

CO.,INC.

•

Indianapolis

Indiana

"Thelisting

ofany

available

replacementpartherein

does

not

constitute

inany

case

recommendation,warranty

guaranty

Howard

Sams

Co.,

Inc.,

tothe

quality

and

suitability

such

replacement

part.

The

numbers

these

partshavebeen

compiled

frominformationfurnished

Howard

Sams

Co.,

Inc.,

bythe

manufacturers

ofthe

particulartype

replacement

part

listed."

"Reproduction

use,without

express

permission,

editorial

pictorial con-

tent,

inany

manner,

prohibited.

patent

liability

assumedwithrespect

the

useofthe

informationcontained

herein.

Howard

Sams

Co.,Inc.,

Indianapolis

Indiana,

U.S.of

America.

under

In-

ternational

CopyrightUnion.

All

rights

reserved

underInter-AmericanCopyright

Union

11910)

Howard

Sams

Co.,

fnc."

Printed

inU.S.of

America

DATE

2-54

SET

229

FOLDER

AMP

»W

-f

DOTTED

WWTS

ARC

NOT

USED

INALL

MODELS.

WVCN

DOTTED

FARTS

ARE

USED

POINTS

MARKED

X ARE

BROKEN.

WAVE

FORMS

TAKEN

WITH

CONTROLS

StTTO

PRODUCE

VOLT3

PEAK

SIGNAL.

PICTURE

TUBE

PHOTOFACT

STANDARD

NOTATION

SCHEMATIC

©Howord

Soms

Co.,Inc.

1954

PAGE

GENERAL

ELECTRIC

MODELS

21C115,

21T14

(Ch.

21TF)

For

tube

location

see

Tube

Placementchartpage

CHASSIS

TOP

VIEW

SET229

FOLDER

PAGE

CHASSIS

BOTTOM

VIEW-CAPACI

PAGE

_•

(C25)

(C26J

(C22J

CC48J

CC47J

(C46)

(C4]

:APACITORIDENTIFICATION

I•

PAGE

TUBE

PLACEMENT

CHART

RATIO

DEIIFAMP

LI7LI6

®®

(in.

VERTOUTPUT

TOP

VIEW

933

TUBE

FAILURE

CHECK

CHART

The

following

chart

lists

tubeswhosefailures

are

most

likely

produce

the

indicatedsymptoms.

Refer

tubeplacement

chart

for

location

and

type

tube.

POWERSUPPLY

FAILURE

raster,

sound

V19,

V20,

Fuse

(Ml)

LOSS

PICTURE

SOUND

pic,

sound,

has

raster

- V2,V3,V4,V5

pic,

sound,

has

snow

VI,

V2,V3

pic,

has

sound,

has

raster

- V6,V21

Has

pic,

sound

- V7,V8,V9,

V10

Overloaded

picture

SYNC

FAILURE

vert,

sync

V12,

V13,

V14

horiz.

sync

V12,

V15

vert,

horiz.

sync

V12

SWEEPFAILURE

raster,

has

sound

V15,

V16,V17,

V18,

V21

vertical

deflection

V13,

V14

Poor

vert,

linearity

foldover

-V13,

V14

Poor

horiz.

linearity

foldover

V15,

V16,

V17

Narrowpicture

V15,

V16,

V17,

V18,

V19,

V20

Vert,

off

freq.

V12,

V13,

V14

Horiz.

off

freq.

V12,

V15

SET

229

FOLDER

PAGE

ALIGNMENT

INSTRUCTIONS

ALIGNMENT

INSTRUCTIONS-READ

CAREFULLY

BEFORE

ATTEMPTINGALIGNMENT

The

high

voltageshock

hazard

maybe

eliminated

removing

the

horizontal

multivibratortube

from

its

socket.

Allow

minute

warm-upperiod

for

receiver

and

test

equipment.

TRAP

ALIGNMENT

Turn

the

fine

tuning

control

andthe

contrast

control

fully

clockwise.

Turn

the

volume

control

andthe

area

control

fully

counter

clockwise.

DUMMY

ANTENNA

Direct

SWEEP

GENERATOR

COUPLING

High

side

point

<&>

Low

side

chassis.

High

side

point

<Q>

Low

side

chassis.

SWEEP

GENERATOR

FREQUENCY

Not

used

MARKER

GENERATOR

FREQUENCY

47.25MC

(400-UMod)

41.25MC

SMC

(400%Mod)

CHANNEL

CONNECT

SCOPE

Vert.

Amp.

point

Low

side

chassis.

Vert.

Amp.thru

de-

tector

(Fig.l)

point

Low

side

chassis.

ADJUST

REMARKS

Remove

VllandV16

from

their

sockets.

Adjust

for

MINIMUM

400%

indication

scope.

necessary,

set

scope

gain

maximum.

Adjust

for

MINIMUM

4001

indication

scope.

VIDEO

ALIGNMENT

Connect

the

negativelead

ofa 4.5

volt

bias

supply

pointo^

Connect

positive

lead

chassis.

Turn

contrast

control

fully

counterclockwise.

Remove

the

converter

tube

from

its

socket

and

replace

with

6J6

which

haspin1

removed.Thiswilldisable

the

local

oscillator

and

reduce

the

possibility

erroneousindications.

Connect

the

synchronizedsweepvoltage

from

the

sweepgenerator

tothe

horizontal

input

ofthe

oscilloscope

for

horizontaldeflection.

DUMMY

ANTENNA

Direct

SWEEP

GENERATOR

COUPLING

High

side

toanun-

grounded

tube

shield

floating

over

dummy

converter

tube.

Low

side

chassis.

SWEEP

GENERATOR

FREQUENCY

44MC

(10MC

Swp)

MARKER

GENERATOR

FREQUENCY

44.15MC

45.25MC

42.9MC

41.25MC

42.

SMC

45.0MC

45.75MC

47.25MC

CHANNE1

CONNECT

SCOPE

Vert.

Amp.thru

10KT2

resistor

point

<.iS

Low

side

chassis.

ADJUST

A4,

REMARKS

Calibrate

scope

that

.75

volt

produces

inch

vertical

deflection.

Peak

thru

for

maxitnumum

response

marker

frequency.

Adjust

thru

A8for

response

similar

Fig.

necessary,

retouch

A4,

and

A6to

shape

peakregion

curve.

SOUND

ALIGNMENT

USING

SIGNAL

GENERATOR

AND

VTVM

Connect

two

matched

100KB

(±1%)

resistors

series

from

polnt<f\to

chassis.

The

junction

these

two

resistors

alignment

polnt<&>as

shown

onthe

schematic.

DUMMY

ANTENNA

.01MFD

SIGNAL

GENERATOR

COUPLING

High

side

topin1

(grid)

6CB6

(V7)

. Low

side

chassis

SIGNAL

GENERATOR

FREQUENCY

SMC

(Unmod)

CHANNEL

Any

non-

interfer-

ing

channel

CONNECTADJUST

VTVM

ADJUST

probe

point<y>

A9,

A10,

Common

chassis.

All

probe

point

A12

Common

point

•

REMARKS

Adjust

for

maximumdeflection.

Adjust

for

zero

reading.

positive

and

negative

read-

ing

will

obtained

either

side

ofthe

correct

setting.

SOUND

A1IGNMENTUSING

SIGNALGENERATOR

AND

OSCILLOSCOPE

Use

frequencymodulated

signal

with

60^

modulated

and

450KC

sweep.

Use

120^

sawtooth

voltage

scope

for

horizontal

deflection.

DUMMY

ANTENNA

01MFD

SWEEP

GENERATOR

COUPLING

High

side

to pin 1

(grid)

6CB6

(V7)

Low

side

chassis.

SWEEP

GENERATOR

FREQUENCY

SMC

(450KC

Swp)

MARKER

GENERATOR

FREQUENCY

SMC

CHANNEL

Any

non-

interfer-

ing

channel

CONNECT

SCOPE

Vert.

Amp.thru

10K«

point

Low

side

chassis.

Vert.

Amp.thru

10KJJ

point

Low

side

chassis.

ADJUST

A9.A10

All

A12

REMARKS

Disconnect

stabilizer

capacitor

C4.

Adjust

for

curve

maximumamplitude

and

symmetry

asin

Fig.

Reconnect

stabilizer

capacitor

C4.

Adjust

that

SMC

occurs

center

cross-

over

lines

asin

Fig.

SLIGHTLYretouch

Allfor

maximumamplitude

and

stralghtness

crossover

lines

SOUND

ALIGNMENT

USING

SIGNAL

AND

VTVM

Replace

Vll

and

V16.

Remove

dummy

oscillator

tube

and

replaceoriginal

6J6

inits

socket

Turn

thesetonand

tune

ina TV

station.

Connect

the

VTVM

and

adjust

A9,

A10,

All

andA12

steps

6 and7

under

"Sound

alignmentusing

signal

generator

and

VTVM".

PERM1SSABLE

VARIATION

N-rHfr-

FIG.I

IG.2

FIG3

PAGE

ALIGNMENT

INSTRUCTIONS

(cont)

OSCILLATOR

ADJUSTMENT

Leavebiasconnected

under

Video

alignment

Connect

the

synchronizedsweepvoltage

Irom

the

sweep

generator

tothe

horizontal

input

ofthe

oscilloscope

lor

horizontal

deflection.

The

sweepgenerator

output

lead should

terminated

with

its

characteristic

impedance,usually

ohms.

Set the

fine

tuning

control

to the

mid-position

its

range.

DUMMY

ANTENNA

Two

1200

Carbon

Resistors

SWEEP

GENERATOR

COUPLING

Across

antenna ter-

minals

with

12013

each

lead.

SWEEP

GENERATOR

FREQUENCY

213MC

(10MC

Swp)

207MC

(10MC

Swp)

201MC

(10MC

Swp)

195MC

flOMC

Swp)

189MC

OOMC

Swp)

183MC

(10MC

SWD)

177MC

(10MC

Swp)

85MC

(10MC

Swp)

79MC

(10MC

Swp)

69MC

ilOMC

Swp)

63MC

(lOMCSwp)

57MC

(10MC

Swp)

MARKER

GENERATOR

FREQUENCY

211.25MC

215.75MC

205.25MC

209.75MC

199.25MC

203.75MC

193.25MC

197.75MC

187.25MC

191.75MC

181.25MC

185.75MC

175.25MC

179.75MC

83.25MC

87.75MC

77.25MC

81.

SMC

67.25MC

71.75MC

61.25MC

65.75MC

55.25MC

59.75MC

CHANNEL

CONNECT

SCOPE

Vert.

Amp.

thru

10KS2

resistor

point

Low

side

chassis.

ADJUST

A13

REMARKS

Adjust

place

soundmarker

inthe

trap

notch

asin

Fig.

RFAND

MIXER

ALIGNMENT

The

RFand

mixerportion

this

receiver

has

beenproperlyaligned

atthe

factory

andis

very

stable.

Alignment

this

portionshould

not

attempted

inthe

field.

•«

i—

FIG.4

IG.5

PAGE

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