Emerson 614 Manuel utilisateur

'Emerson

Radio

SERVICE

MANUAL

MODELS

614-637-644-647

MODEL

614

-•

MODEL

644

MODEL

637

MODEL

647

Television

Receivers

EMERSON

RADIO

AND

PHONOGRAPH

CORPORATION

111

EIGHTH

AVENUE

NEW

YORK

11r

N.Y,

Emerson

Radio

Par.

TABLE

CONTENTS

SECTION

1—GENERAL

DESCRIPTION

Page

Facilities

Specifications

SECTION

2—INSTALLATION

LIST

TABLES

Table

DESCRIPTION

Page

TubeComplements

ReceiverCharacteristics

III

AdjustmentsControlSettings

GeneratorFrequencies_.._

Audio

I-F

Alignment

Video

I-F

Alignment

VII

TunerAlignment

.-.17

VIII

DeflectionWaveformTestPoints

•>

SECTION

3—

OPERATION

SECTION

4 —

CIRCUIT

DESCRIPTION

General

...

Tuner

Video

Section

_ _ ..

Deflection

Section

— , _ _

Power

Supplies

Intercarrier

Sound

—

Deflection

Yoke

and

Focus

Coil

Assembly

SECTION

5—

MAINTENANCE

AND

ALIGNMENT

ChassisRemoval

.„

KinescopeReplacement

Mechanical

Deflection

Adjustments

...

..«___,

Electrical

Deflection Adjustments

...

Alignment

Test

Equipment

Alignment

...

. .

Voltage

and

ResistanceAnalysis

;

Deflection

CircuitWaveforms

Production

Changes

Secondary

Area

Reception

Cabinet

Parts

List

Chassis

Parts

List

Fig.

1-1

1-2

1-3

3-1

3-2

3-3

3-4

3-5

3-6

3-7

3-8

3-9

4-1

4-2

5-1

5-2

5-3

5-4

5-5

5-6

5-7

5-8

5-9

5-10

5-11

5-12

5-13

LIST

ILLUSTRATIONS

DESCRIPTION

Page

FrontView

Chassis

120098B

TubeLocationDiagram

Video,

Audio,

and

OscillatorFrequencies

FrontPanelControls

Test

Pattern,Correctly

Adjusted

TestPattern,

Tuning

Misadjusted

Test

Pattern,ExcessiveContrast

TestPattern,ExcessiveBrightness

TestPattern,VerticalHoldMisadjusted

TestPattern,Horizontal

Hold

Misadjusted

TestPattern,FocusMisadjusted

TestPattern,WeakSignal

Block

Diagram—Chassis

12O110B,120113B

Schematic

Diagram

Tuner

DeflectionYoke

and

FocusCoilAdjustments

CombinedMechanical

and

ElectricalCentering

FocusCoilAdjustments,MechanicalCentering

SchematicDiagramChassis120110B12,13

Rear

DeflectionAdjustments

GeneratorMatchingNetwork

ScopeDetectorNetwork

— 14

Location

AlignmentPoints

TunerAlignmentPoints

SideView

Tuner

Voltage

and

ResistanceDiagram

Sweep

CircuitWaveforms

High

Voltage

PowerSupply,Chassis120113B

BottomView

Chassis

Emerson

Radio

Section

GENERAL

DESCRIPTION

FACILITIES—Emerson

Models

614,637,644,

and647are

wide-bandvideoreceivers,providing

di-

reci-view

high-definition

pictures

ontenor

twelve-inch

electro-magneticdeflectionkinescopes.

All

models

in-

corporateseveraldesignfeaturesincludingintercarrier

sound,

AFCinthe

horizontalsync circuits,automatic

gain

control,

series-typetransformerpowersupply,

and

internalantennas.

Models

614and637

employChassis

120110B;

Models

644and647use

Chassis

120113B.

Bothchassis

are

basically

alike;

the

latter

modified

accommo-

date

the

largerkinescope,type

12LP4

12QP4.

Model

614is

housed

ina

plasticcabinet,

and

Model

637is

contained

ina

wooden

cabinet;

both

are

table

model

receiversusing

type

10BP4

picturetube.

Model

644is

housed

ina

tablemodel

cabinet;

Model

647

uses

consolette-type

cabinet.

SPECIFICATIONS—

TUBE

COMPLEMENTS:

(Table

1).

NOT!1":

The

tube

complements

bothchassis

are

alike,except

forthe

kinescope.Chassis

120113B

usestype

12LP4

kinescope;

somechassis

maybe

equipped

with

type

12QP4.

SYMBOL

V10

Vll

V12

V13

V14

V15

V16

V17

V18

V19

V25

V27

V28

V29

TRP

TYPE

6AG5

6AU6

6AL5

6AU6

12AU7

6AU6

6T8

6V6GT

6SN7GT

6AL5

6SN7GT

12AU7

6K6GT

6BG6G

1B3GT

6W4GT

)

10BP4*

112LP4#

6J6

6AG5

FUNCTION

First

video

i-f

amplifier

Secondvideo

i-f

amplifier

Third

video

i-f

amplifier

Video

detector

andAGC

First

video

amplifier

Secondvideo

amplifier;

second

sync

amplifier

Sound

i-f

amplifier

Sound

limiter

Sound

disc,

and

audioamp.

Audio

output

Hor.phase

invert.;

horizontal

control(d.c.amp.)

Hor.phasedet.

(sync

disc.)

Hor.oscillator

and

discharge

Vert,

oscillator

and

discharge

Sync

sep.

and

d.c.restorer;

first

sync,

amplifier

Vertical

output

Horizontal

output

High-voltage

rectifier

Horizontaldamper

Kinescope

Oscillator

and

converter

R-f

amplifier

5U4G

Low-

voltage

rectifier

Chassis

120110B

Chassis

120113B

WOBBLE

PLATE

LEVER

LOW

VOLTAGE

POWER

SUPPLY

PICTURE

CENTERING

LEVER

(FOCUS

COII

DEFLECTION

YOKE

C-2l,C-39,C-4l,C-74

HIGH

VOLTAGE

POWER

SUPPLY

ON-OFF

VOLUME

AND

CONTRAST

AUDIO

I-

SECTION

C-36.C-49

C-75

VERTICAL

HOLD

BRIGHTNESS

AND

HORIZONTAL

HOLD

VIDEO

I-F

SECTION

TURRET

TUNER

SELECTOR

AND

FINE

TUNING

Figude

1-1—Front

View

Chassis

120110B

Emerson

Radio

LOCATIONS

Figure

1-2

Tube

Location

Diagram

RECEIVER

CHARACTERISES:

(TableII).

ITEM

Voltage

Rating

Power

Consumption

Current

Drain

(At

117

volts

a.c.)

Frequency

Range

.Intermediate

Frequencies

Input

Impedance

Channel

Selection

Chassis

Models

Audio

Output

DESCRIPTION

105-125

volts,

cycles

a.c.

All

models

—

190

watts

All'

models

— 1.7

amps.

54-88

MC.;

174-216

MC.

Video

—

25.75

MC.

Audio

— 4.5MC.

300

ohms,

balanced

Twelve

position,

rotary

turret

Models

614,

637—

Chassis

1201

10B

Models

644,

647—

Chassis

120113B

2.5

watts

9S53ZO

OSCILLATOR

FREQUENCY

CHANNEL

LIMITS

CHANNEL

AUDIO

CARRIER

VIDEO

CARRIER

CH.2

CH.3 CH.4

CHS

CH.6

103

109

59.75

Jr.

71.

Is!6

81.75

87.7

LOW

BAND

55.25

67.25

77.25

8325

OSCILLATOR

FREQUENCY

CHANNEL

LIMITS

CHANNEL

AUDIO

CARRIER

VIDEO

CARRIER

174

179.

180

CH.7CH.8

201

207

CH.9

213

CH.IO

CH.M

CH.I2

CKI3

219

225

231

237

2O4

210

216

'°

185.

197.7

203.75

20!

.75

215

HIGH

BAND

175.25

18125

187.25

193.25

199.25

205.25

211.25

Figure

1-3—Video,

Audio,

and

Oscillator Frequencies

Section

INSTALLATION

PREPARATION

FOR

INSTALLATION

—

All

models

are

shippedcomplete,with

the

kinescope

place

andall

adjustmentsproperlyset.Present

models

are

equippedwithinternalantennas

andme-

chanicaldeflectioncentering.

Initial

production

mod-

elsdonot

include

the

built-in

antenna

and

make

use

combinedelectrical

and

mechanicalcentering.

ANTENNA

INSTALLATION—Chassis

12011013

and

120113B

are

designed

operate

withhighsensi-

tivity

and

willprovideexcellentreception

many

areaswith

the

internalantenna.

performance

ina

particularlocality

unsatisfactorydisconnect

the

internal

antenna

and

install

portable

oran

outdoor

antenna,

depending

receptionconditions.

PORTABLE

ANTENNA:

Sincesurrounding

buildings

and

otherobjects

can

block

out

televi-

sionsignals,

indoorantennashould

tried

different

locationsbeforedeciding

ona

perma-

nentposition.Uncoil

the.

transmissionline

from

the

antennabase

and

connect

tothe

terminals

the

rear

the

chassis.

Tune

the

antenna,

after

turning

onthe

receiver

and

adjusting

the

con-

trols,

rotating

and

varying

the

length

ofthe

telescopic

arms

for

bestreception.Botharms

should

adjusted

tothe

sameangularposition

and

extended

tothe

samelength.

PERMANENT

ANTENNA:

For

outdoor

, an-

tenna

installations,

usea

dipole

oran

array

with

combination

elements.

EmersonTele-Ray

antenna

recommended,

for

bestresults.

300-

ohm

transmission

line

required

for

connection

the

receiver.

Emerson

Radio

RECEIVER

INSTALLATION

—

Locate

the re-

ceiver

where

minimum

brightlight

falls

directly

onthe

screen,althoughcompletedarkness

isnot

recom-

mended.

Provideadequateventilation

keeping

the

back

ofthe

receiveraway

from

the

wall.

Donotob-

struct

the

ventilatingslots

atthe

rear

ofthe

cabinet.

All

models

are

providedwith

protectiveenclos-

urefortheendof.the

kinescope.

The

enclosure

fastened

tothe

rear

ofthe

chassis.Careshould

beex-

ercised

duringinstallation

soasnotto

strike

orjar

the

enclosure.

After

completion

antenna

and

powerconnec-

tions,

operate

the

receiver

outlined

SectionIII.

receiver

fails

operate,

orif

operation

unsat-

isfactory,

proceed

with

the

following

checks

andad-

justments.

CAUTJON

Only

experienced

personnel

shouldattempt

make

theseadjustments,

highvoltage

often

kilovolts

present

atthe

kinescope.

MECHANICAL

ADJUSTMENTS:

Forall

models,

remove

the

chassisback

and

check

all

tubes

makecertainthey

arefirmly

seated

their

sockets.Remove

the

kinescopeenclosure

and

check

the

seating

ofthe

base plug.Inspect

the

high-voltageanodeconnector.

The

deflection

yoke

and

focus

coil

havebeen prop-

erly

positioned

atthe

factory.

The

kinescopeshould

seatedbackagainst

the

edges

ofthe

deflection

yoke

assembly.Inspect

the

assembly

make

certain

that

all

adjustmentwingnuts

are

tight.

Theion

trap

should

positionedapproximately

over

thetwo

internal

flags

near

the

base

ofthe

kinescope.

ELECTRICAL

ADJUSTMENTS:

adapter

line

cord

required

operate

the

receiver

for

the

following

preliminaryadjustments.

Turn

the

OFF-VOLUME

control

quarter-

turnclockwise

turn

onthe

receiver.

Setthe

BRIGHTNESS

control

half-turn

clockwise

and

turn

the

CONTRAST

control

countei-

clockwise.

Allow

the

tubes

warm

up.

Setthe

SELECTOR

control

toan

activechan-

nel

and

adjust

the

TUNING

control

for

best

picture

quality.

test

pattern

preferable

for

theseadjustments.

Adjust

theion

trapmagnet

movingslowly

forward

backwardwhilerotating

slightly

around

the

neck

-the

kinescope

obtain

maximumpicturebrightness.Reduce

the

BRIGHTNESS

controlsettinguntil

the

pat-

tern

at7

approximatelynormalbrilliancy.

Ad-

just

the

'FOCUS

control,

atthe

rear

the

chassis,

for

maximum

sharpness

rasterlines.

Then

readjust

theion

trap

for

maximumbril-

liancy.

Adjustment

ofthe

deflectionyokeassembly

required

ifthe

raster

isnot

horizontal.Loosen

the.

center

wingnut

and

rotate

the

assembly

slightly

correctthiscondition.

Centering

ofthe

raster

inthe

mask

con-

trolled

bothelectrical

and

mechanical

ad-

justments,

orby

mechanicaladjustmentsalone.

thisadjustment

required,refer

Section

Vfor

operation

ofthe

chassiscontrols

andpo-

sitioning

ofthe

focus

coil.

6)All

electricaladjustments

atthe

rear

ofthe

chassishavebeen

setatthe

factory.

Ifthe

set-

tingshavebeendisturbed

orifthe

kinescope

requires

replacement,theymust

carefully

readjusted

accordancewith

the

procedure

outlined

Section

OPERATION

OPERATING

CONTROLS—The

operation

and

function

ofthe

front-panel

controls

identical

forall

models.

Sevencontrols

are

provided,

shown

infig-

ure

3-1.

TUNING—Tuning

the

receiver

initially

requires

operation

ofthe

variouscontrols

indicated.

STATION

SELECTION:

Turn

the

OFF-VOLUME

controlclockwise

approximately

quarter-turn.

This

turns

the

receiver

onand

sets

the

soundvolume

toa

reasonablelevel.

2)Set

the'SELECTOR

control

that

the

desired

channel

number

indicated

onthe

edge

ofthe

control.

Thiscontrol

maybe

rotated

either

direction.

Allowapproximately

seconds

for

warmup.

(This

time

necessary

allow

the

tubes

attain

the

propertemperature

for

operation.)

4)Ifthe

desiredstation

is-broadcasting,

music

speech

will

heard.Adjust

the

TUNING

control

for

best

picture

quality.Readjust

the

VOLUME

desiredsound

level.

Rotate

the

CONTRAST

control

toits

extreme

counter-clockwise

position.

CONTRAST

CONTROL:

ADJUSTS

PICTURE

CONTRAST,

LIGHT

DARK.

•OFF-VOLUME

CONTROL:

TURNS

RECEIVER

ONAND

ADJUSTS

SOUND

VOLUME.

BRIGHTNESS

CONTROL:—

ADJUSTS

PICTURE

AVERAGE

BRIGHTNESS.

HORIZONTAL

HOLD

CONTROL

STOPS

HORIZONTAL

MOTION

PICTURE.

VERTICAL

HOLD

CONTROL.

STOPS

VERTICALMOTION

PICTURE

INDICATOR

CONTROL;

SELECTS

STATIONS.

FINE

TUNINGCONTROL

ADUSTS

RECEIVER

FOR

BEST

PICTURE

Figure

3-1—front

Panel

Controls

Emerson

Radio

Figure

3-2—Test

Pattern

Correctly

Adjusted

Figure

3-4—Test

Pattern

Excessive

Contrast

,r'

.,'

'-f

.«.

•

Figure

3-3—Test

Pattern

Tuning Misadjusted

Figure

3-5—Test

Pattern

Excessive

Brightness

Figure

3-6—Test

Pattern

Vertical

Hold Misadjusted

Figure

3-7—Test

Pattern

Horizontal

Hold Misadjusted

Figure

3-8—Test

Pattern

Focus

Misadjusted

Figure

3-9—Test

Pattern

Weak

Signal

Emerson

Radio

Rotate

the

BRIGHTNESS

control

tothe

max-

imum

counter-clockwiseposition

and

then

ad-

just

slowlyclockwiseuntillight

just

visible

the

screen.Rotate

reversedirection

un-

til

lightjustvanishes.

Adjust

the

CONTRAST

control

until

pic-

ture

appears

onthe

screen

and

desiredcon-

trast

attained.

further

reduction

inthe

BRIGHTNESS

controlsetting

may

improve

the

apparentcontrast

ofthe

picture.

8)Ifthe

picturemoves

vertically

horizontally,

make

the

adjustmentindicated

steps

and/

or10.

9).Adjust

the

VERTICAL

HOLD

controluntil

the

picture

stops

moving

upor

down.

Proper

operatingsetting

thiscontrol

isinthe

cen-

terofthe

range

over

which

the

pictureremains

stationary.

10)

Adjust

the

HORIZONTAL

HOLD

control

until

picture

stops

moving

from

side

side.

11)

Readjust

the

CONTRAST

control

until

the

desiredpicture

intensity

obtained.

Itmay

necessary

readjust

the

BRIGHTNESS

control

slightly

atthe

sametime

for

optimum

brilliance.

12)

After

the

receiver

has

beenoperating

for

some

time,

itmaybe

necessary

readjust

the

TUN-

ING

control

slightly

for

best

picture

quality.

1).

CHANGING

STATION

DURING

OPERA-

TION

Setthe

SELECTOR

control

tothe

proper

channel

number.

Readjust

the

TUNING

control

necessary

obtain

best

picturequality.

Readjust

the

CONTRAST

controlslowly

un-

til

the

desiredpicturequality

obtained.

Readjust

VOLUME

suitable

level.

Readjust

BRIGHTNESS

control

for

desired

brilliancy.

CHECKING

OPERATION:

Theuseof

auto-

maticfrequencycontrol

the

sync

circuits

the

receiver

makes

readjustments

ofthe

VER-

TICAL

HOLD

and

HORIZONTAL

HOLD

controls

infrequent

provided

the

controlset-

tings

for

proper

operation

arenot

disturbed.

Figures

3-2

through

3-9

indicatecorrect

and

incorrectadjustment

ofthe

variouscontrols.

Proper

operation

maybe

obtained

operation

the

associatedcontrol.

Section

CIRCUITDESCRIPTION

GENERAI^-Chassis

120110B

and

120113B

are

basically

alike;

the

latter

modified

accommodate

12-inchkinescope

and

containssomechanges

inthe

high-voltagepowersupplycircuits.Bothchassiscon-

taintwenty-threetubesincluding

the

kinescope

and

low-voltage

rectifiers.

The

chassis

usethe

intercarrier

method

soundreception,with

the4.5

me.

audio

i-f

produced

heterodyning

the

video

and

audio

carriers

atthe

output

ofthe

video

detector.

The

various

stages

the

receivers

are

indicated

inthe

blockdiagram,

fig-

ure

4-1.

I05-I25V

60~A

;

R-F

6AC

V-I5B

1ST

SYNC

AMP

I2AU7

V-2

L.V.

RECT.

5U4G

V-2

CONVE

V-2

ATOR

V-

AUDIO

I-F

AMP

64U6

I2575MC

'I2I.25MC.

V-l

VIO

I-F

AMP

6AG5

V-6B

2ND

SYNC.

AMP.

I2AU7

B1-

B-

V-2

2ND

VIO

I-F

AMP

SAGS

V-3

3RD

VID.

I-F

AMP

SAUS

V-l

HOR

PH.

INV.

SSMTOT

V-14

VERT

OSC.

6SN7GT

•—

V-

VID.

DET.

AND

AGC

SALS

V-IZ

HOR.PH.

DET.

6AL5

V-IS

VERT.

AMP

6K6GT

V-8

AUDIO

I-F

LIMITER

6AU6

V-5

VIDEO

AMP

6AU6

V-9

DISC.

AND

AUOIO

AMP

•Ti

V-6A

VIDEO

AMP.

I2AU7

V-MB

HOR

CONT

6SN7GT

V-13

HOR.OSC.

6SN7

V-17

HOR

AMP.

68G60

V-IO

AUDIO

OUTPUT

SV60T

V-I5A

SYNC.

SEP.

RES.

AU7

-IB

H.V.

RECT.

IB3GT

V-19

HOR.

DAMP

6W4GT

-tf

°4

V-25

IZLP*-

Figure

4-1—Block

Diagram,

Chassis

120110B,

120113B

Emerson

Radio

TUNER

— The

r-f.unitconstitutes

separate

sub-chassis

ofthe

receiver.

This

sub-chassis

con-

tains

the

r-f

amplifier,converter,

and

oscillator

stages.

The

channelswitch,

fine

tuningcontrol,

tuned

circuits,

andfirst

video

i-f

transformer

are

alsocontained

thischassis.Tuning

and

track-

ing

adjustments

forall

twelvechannelscurrently

useare

provided.

The

tunerserves

select

and

amplify

the

desiredvideo

and

audio

frequen-

cies

and

convertthem

tothe

carrier

i-f

frequencies

25.75

me.

for

video

and

21.25

me.

for

audio.

separation

these

two

intermediatefrequen-

cies

mads,

andthe

completesignal

isfedtothe

first

video

i-f

stage.

The

tuneruses

rotaryturretcarryingindivid-

ual

coils

for

each

tunedcircuit,

for

eachchannel

setting.

type

6AG5

(V28)serves

asther-f

amplifier

anda

type

6J6

(V27)

asthe

converter

and

oscillator.

Ther-f

amplifier

isa

wideband,

tuned

stagewhoseoutput

inductivelycoupled

the

converter

(V27).

The

oscillator

(V27B)

operates

ina

Colpittstypecircuit.Individual

slugsprovide

for

alignment

ofthe

oscillator

onthe

various

channels.

variable-dielectric

type

condenser

used

forfine

tuning

ofthe

oscillator.

The

output

ofthe

converter

conected

double-

tuned

firsti-f

transformer

(Tl).

The

center-tappedprimary

(LI)

ofther-f

coil

designed

match

balanced

300-ohm

line.

The

secondary

(L2)

tuned

bythe

inputcapacity

V28in

serieswith

the

parallelcombination

trimmer

A14anda 5

mmf.

condenser.

The

output

V28is

coupled

V27A

byL3,

which

tuned

trimmer

A15

and

'the

outputcapacity

ofthe

tube.

A 10K

resistorloads

provide

the

requiredbandpass.

The

inputcapacity

V27A

and

trimmer

A16

tune

the

converter

coil

(L4).

The

oscillatorcoil

(L5)

wound

onthe

sameformwith

L3and

L4,for

inductivecoupling.

The

initialoscillator

frequency

isfixedby

permeabilitytuning

ofL5

and

the

preset

.5-3mmf.trimmer.

The

frequency

varied

means

ofthe

TUNING

control(3-5

mmf.

trimmer)whichconsists

ofa

spiral-shaped

dielectric

discrotatingbetween

fixed

stator

plates.

950098

270

ALL

RES.

OHMS,

CAP.

MMF,

UNLESS

OTHERWISE

SPECIFIED

6.3AC

Figure

4-2

Schematic Diagram

Tuner

VIDEO

SECTION—The

video

sectionconsists

the

following

sections:

video

i-f;

video

detector

and

automatic

gain

control;

video

amplifier

and

d.c.

re-

storer.

VIDEO

I-F:Both

the

25.75

me.

videocarrier

and

21.25

me.

audio

carrier

are

amplified

three

wide-band

i-f

stages.

The

four

tuned

cicruits

are

peaked

.different

frequencies,forming

stagger-

tuned

system

relatively

flat

overallresponse

produce

the

requiredbandpass.

Self-resonant,

slug-tuned

coils

are

used

inthe

i-f

transformers.

Two

stagger-tuned

i-f

trans-

formers

(T2,

T3)

the

overcouplscl

firsti-f

(Tl).

providedwith

21.25

me.

trap

Emerson

Radio

attenuate

the

audioi-f.

overcoupled

i-f

(T4)

completes

the

amplifier

stages

and

feeds

the

video

detector(V4).

The

audio

level

maintained

just

below

the

point

intertcrence

with

the

videoi-t.However,

the

audio

i-t

not

completelyrejected,

asthe

audio

signal

recovered

(ac

the

output

otthe

video

de-

tector)

heterodyningwith

the

videoi-f.

The

4.5

me.

beat

between

video

and

audio

inter-

mediate

frequencies

obtained

from

the

shunt-

tunedcircuitconsisting

ofL2andC79andisfed

tothefirst

audio

i-f

amplifier(V7).

VIDEO

DETECTOR

AND

A.G.C.

:The

video

detector(V4A)

rectifies

the

negativeportion

the

videoi-f.

The

resultantsignal

coupled

throughpeakingcoil

tothe

grid

ofthefirst

videoamplifier(V5).

V5B

acts

asthe

automatic

gain

control

and

develops

delayed

negative

A.G.C.

voltagewhich

used

bias

thefirsttwo

video

i-f

stages

andther-f

amplifier.

VIDEO

AMPLIFIER:

The

video

amplifier

con-

sists

oftwo

stages

(V5and

V6A).

The

second

stage

series-peaked

andis

coupled

tothe

grid

the

kinescope(V25)

andthe

sync

separator

and

d.c.

restorer

(VISA).

The

outputsignal

varied

bythe

CONTRAST

control(R19)

which

varies

the

bias

ofVS,to

control

the

signal

input

V6A.

D.C.

RESTORER

AND

SYNC

CLIPPER:

The

output

ofthe

videodetectorcontainsbotha.c.

and

d.c.components

ofthe

videosignal,

well

asthe

blanking

and

syncpulses.Since

the

video

amplifiers

will

not

pass

the

d.c.component

ofthe

videosignal,

the

backgroundlevel

ofthe

picture

will

vary.

The

d.c.restorer

(VISA)

develops

bias

voltageacross

R24

whichvarieswith

the

averagevideosignallevel.

This

biasvoltage

fed

tothe

grid

ofthe

kinescope,thusmaintaining

the

properbrightnesslevel.

The

videosyncpulse

output

VISA,

developed

across

R28,

coupled

through

C22

tothefirst

sync

amplifier

(V15B).

DEFLECTION

SECTION—The

sync

and

sweep

stagesproduce

and

control

the

deflection

ofthe

elec-

tronbeam

inthe

kinescope.

The

horizontalsweepcir-

cuitsincorporate

horizontal

phasedetector(sync

discriminator)

maintainautomaticsyncwith

the

horizontal

pulses

ofthe

videosignal.

SYNC

AMPLIFIER

AND

INVERTER:

The

sync

pulseoutput

VISA

amplified

bytwo

triode

stages

(VISE

and

V6B)

andfedtothe

horizontal

phaseinverter

(V11A).

The

integrat-

ing

network

ofthe

vertical

deflection

circuit

coupled

tothe

output

VI1

which

provides

push-pull'

output

for

I'le

horizontal

syncdiscrimi-

nator

(VI2).

HORIZONTAL

SWEEP:

The

horizontal

de-

flection

circuits

contain

automaticfrequency

stabilizing

arrangement

which

improvesstability

and

ease

operation.

The

phaseinverter

(V11A)

feeds

the

horizontalsyncpulses

tothe

horizontal

phasedetector

(V12).

Atthe

sametime,

V12

receives

voltages

fed

back

from

the

horizontal

out

put

(V17)through

CSS.

Any

phase

shift

between

the

horizontalsyncpulses

andthe

horizontal

os-

cillator

signal

will

cause

the

inputvoltageapplied

toone

diodesection

ofV12to

differ

from

that

the

other

and

result

ina

d.c.biasvoltage

onthe

grid

ofthe

horizontalcontroltune

(Vll-b).

This

bias

voltage

will

proportional

tothe

phasedis-

placementbetween

the

incomingsyncpulses

and

the

horizontaloscillatorvoltage

andofa

polarity

determined

bythe

lead

orlagofthe

oscillatorfre-

quency.

The

plateresistance

VHP)

part

the

biasnetwork

ofthe

gridcircuit

ofthe

horizon-

tal

oscillator

(Vlo).

The

output

ofthe

phase

de-

tector(V12)

will

ihus

synchronize

the

oscillator

tothe

horizontalpulses

ofthe

videosignal.

The

horizontalblockingoscillator(V13)operates

ata

frequencydetermined

C57,R75,R76,

and

the

plateresistance

VIIB.

The

horizontal

sync

pulsescause

V13to

lock

inatthe

sync

frequency

when

the

HORIZONTAL

HOLD

control

\R75)

properly

adjusted.

The

sweep

voltage

output

V13is

developed

across

R79andistedtothe

horizontaloutputtube

(VI7).

The

signallevel

tothe

horizontaloutputtube

adjusted

bythe

HORIZONTAL

DRIVE

control,R80.

V19

supplies

the

requireddrivingpower

forthe

horizontal

deflection

coils(L9).

'ihe

output

V17is

coupled

the

horizontal

deflection

coils

throughoutputtransformer

T9.A

portion

ofthe

output

transformersecondary

shunted

bythe

HORIZONTAL

SIZE

control

L6.By

varying

the

inductance

ofL6,the

horizontalsweepcurrent

maybe

controlled.

The

horizontaldampertube

(V19)

acts

damp

out

oscillationswhichoccuroverpart

ofthe

hori-

zontalscanningcycle.

The

HORIZONTAL

LIN-

EARITY

control(L7)helpsprovide

linear

trace.

V19isa

type

6W4to

eliminate

the

need

for

separatedamper

filament

winding,

VERTICAL

SWEEP:

Verticaloscillator

V14

free-running

and

operates

ata

frequencydeterm-

ined

C71,R95,

andthe

VERTICAL

HOLD

control

(R94),

inthe

absence

ofa

verticalsync

pulse.

The

integratedsixty-cyclesyncpulse

de-

rived

from

the

videosignalreaches

the

grid

V14

just

before

wouldnormallytrip.

This

sync

pulse

great

enough

drive

the

tube

conduc-

tion

and

cause

itto

lock-in

atthe

sync

frequency.

The

syncpulsethusmaintains

control

ofthe

verti-

cal

oscillatorsweepfrequencywhen

R94is

cor-

rectlyadjusted.

The

output

ofV14isfed

the

vertical

output

stage

(V16)

throughC72.

The

output

ofV14is

controlled

bythe

VERTICAL

SIZE

control

(R96).

R100varies

the

operatingpoint

ofV16

varying

the

bias,acting

asthe

VERTICAL

LINEARITY

control

The

sweep

voltage

ofV16

coupled

tothe

vertical

deflection

coils(L8)

means

ofthe

verticaloutputtransformer

(Til).

POWER

SUPPLIES

— Two

powersupplies

are

used

supply

the

requiredvoltages.

Thelow

voltage

supply

uses

transformer

and

full-wave

rectifier.

The

high

voltagesupply

forthe

kinescope

isofthefly-back

lype

andis

energized

bythe

horizontaloutputtube.

HIGH

VOLTAGE

SUPPLY:

The

highvoltage

powersupplymakes

useofthe

energysupplied

the

horizontaloutputtransformer

VI7.

When

the

platecurrent

VI7

iscutoffatthe

instant

Emerson

Radio

retrace

horizontalscanning,

thefield

built

inthe

primarycollapses

and

induces

high-

voltage. Thisvoltage

applied

tothe

high-voltage

rectifier

(V18).

From

8.5to10

kilovolts

pro-

duced

bythe

powersupply.

The

rectified

voltage

filteredbyC63and

R89,

and

applied

tothe

secondanode

ofthe

kinescope.Chassis

120113B

differs

from

Chassis

1201

that

C63is

return-

edto

B—,

instead

ofthe

plate

VI9.

LOW

VOLTAGE

SUPPLY:

The

low-voltage

supplyuses

full-wave

rectifier

(V29)

and

trans-

former

(T12).

seriesarrangement

used

supply

platevoltage,

reduce currentrequire-

ments.

Asa

result,

separate

filament

windings

are

used

keep

the

heater-cathodepotentials

within

ratings,

andthe

electrolytic

filter

conden-

sers

arenot

grounded

tothe

chassis.

The

center-

tapof

T12

isnot

grounded

butis

negative

(B—)

with

respect

ground.

The

cathodes

ofthe

sweep

circuit

and

video

amplifier

tubes

are

negative

ground(about-205volts)

andthe

heaters

are

conected

tothe

ungrounded

filament

winding

(Y).

INTERCARRIER

SOUND—The

audiocircuits

are

conventional.

The4.5

me.

heterodynebetween

the

video

and

audio,

i-f

carriers

taken

from

the

shunt-

tuned

circuit

(L2,

C79)

atthe

output

ofthe

video

de-

tector

(V4).

The4.5

me.

signal

amplified

bythe

audio

i-f

amplifier

(V7),whoseoutput

coupled

the

limiter(V8).

feeds

the

discriminator(V9A)

;

the

output

ofthe

discriminator

amplified

V93,

andthe

audiooutput(V10).

DEFLECTION

YOKE

AND

FOCUS

COIL

ASSEMBLY:

The

deflection

yoke

and

focus

coil

form

completeassembly.

The

yokecontains

the

vertical

and

horizontal

deflection

coils

(L8and

L9).

The

focus

coil(L10)combines

permanent

magnet

with

the

electromagnet

(PMand

EM).

The

yoke

and

focus

coil

are

independently

ad-

justable.

Verticalcentering

accomplished

mechani-

cal

adjustment

of the

focus

coil;

horizontalcenter-

ing

doneelectrically

bythe

HOR.

CENTER-

ING

control

(R103).

Laterproduction

Chas-

sis

120110B

and

120113B

makes

useofa

pivoted

mounting

forthe

EM-PM

focus

coil,together

with

"wobble

plate"

provide

for

mechanical

adjustment

horizontal

and

verticalcentering.

The

"wobble

plate"

consists

ofa

ring

perme-

able

material

(steel)

surrounding

the

neck

ofthe

kinescope,adjacent

tothe

EM-PM

focus

coil.

The

plate

maybe

moved

ina

plane

right-angles

tothe

axis

ofthe

kinescope,bothvertically

and

horizontally,

means

ofa

slotted section

and

lever.

addition,

the

focuscoil

maybe

tilted

both

directions

means

ofa

secondleverwhich

adjustable

from

the

rear

ofthe

cabinet,without

removing

the

back.

This

enablesprecisemechani-

cal

control

centering.

Section

MAINTENANCE

AND

ALIGNMENT

GENERAL—All

adjustmentsmust

madeonly

qualified

service

technicians.

Unsatisfactory

oper-

ationshould

analyzed

and

circuitscheckedsyste-

matically

locate

and

correctsources

trouble.

WARNING

Highvoltages

excess

8000

volts

are

present

the

chassis,duringoperation.

Exercise

care

servicing

the

receiver,whenenergized.

Donot

remove,handle,

replace

the

kinescopeunless

gloves

and

goggles

are

worn.

CHASSIS

REMOVAL—To

remove

the

chassis,

the

outlinedprocedure.

a.Pryoffall

controlknobs.

Remove

thesix

screwswhich

fasten

the

back

place.

Remove

the

speakerplug.

Remove

the

four

chassisbolts

and

carefullyslide

the

chassis

from

the

cabinet.Wheninverting

the

chassis,place

supportingblockunder

the

power

transformer.

KINESCOPE

REPLACEMENT

—

CAUTION

Before

removing

the

kinescope,discharge

the

tube

cdnnecting

insulated

test

prod

tothe

chassis

and

tothe

high-voltageanode.

Wear

gloves

and

gogglesbeforehandling

the

tube.

remove

the

tube,proceed

follows:

Disconnect

the

high-voltagelead

atthetopofthe

kinescope

and

discharge

the

tube.

Remove

the

enclosurewhichprotects

the

base

the

kinescope.

Remove

the

tubesocket

and

slide

offtheion

trap.

Loosen

the

hold-down

strap

atthe

front

ofthe

tube

and

carefully

withdraw

the

kinescopefor-

ward

from

the

deflection

yoke

and

focus

coil

as-

sembly.

install

a new

kinescope,

the

abovepro-

cedure

reverse.Makecertain

that

the

tube

seated

against

the

edges

ofthe

deflectionyoke

assembly,with

the

high-voltageanodeconnection

atthe

top.

replacing

theion

trap,

position

the

unit

that

the

arrow

points

towards

the

front

the

chassis.

NOTE

Whenever

the

kinescope

removed

replaced,

the

maskshould

carefully

cleanedwith

soft,

lintlesscloth.

Donotuse

carbontetrachloride

any

cleansercontainingabrasivematerial.

The

face

ofthe

kinescopeshouldalso

wipedclean,

before

replacing

the

chassis

inthe

cabinet.

MECHANICAL

DEFLECTION

ADJUST-

MENTS

— See

figure5-1.Replacement

of the

kine-

scope

orofanyof

the

components

ofthe

deflection

systemwillrequirereadjustment

of the

deflectionyoke

assembly,

focus

coil,

andion

trap.

NOTE

Before

making

any

deflection

adjustments,make

certainthat

the

enclosure

isin

place,covering

the

base

ofthe

kinescope,

andisfirmly

fastened.

The

adjustments

tothe

focus

coil

canbe

made

throughopeningsprovided

inthe

enclosure.

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