Zenith 19M20 Manual de usuario

PHOTO

PACT*

Fold

ZENITH

CHASSIS

19M20,

U,Z,

19M21,

U,UZ,Z

VOLUME

CONTROL

ON-OFF

SWITCH

ZENITHMODEL

CHANNEL

SELECTOR

SWITCH

M1800R

TRADENAMEZenith

MODELS

M1800E,

M1800R,

R1800EZ,

R1800RZ,

R1812EZ,

R1812RZ

M1800EU,

M1800RU,

R1800EUZ,

R1800RUZ,R1812EUZ,

R1812RUZ.

M1800EZ,M1800RZ

M2228R,M2229E,M2229R,M2230E,M2230R,M2230RZ2,

Ma249E,

M2249R,M2250E,

M2250R,

M2252E,

M2252R,

R2229EZ,

R2229RZ,R2230EZ,R2230RZ,R2249EZ,

R2249RZ,R2250EZ,R2250RZ,R2257EZ,R2257RZ,

R2258EZ,R2258RZ

M2228RU,

M2229EU,M2229RU,M2230EU,M2230RU,

M2249EU,

M2249RU,M2250EU,M2250RU,M2252EU,

M2252RU,

R2229EUZ,R2229RUZ,R2230EUZ,R2230RUZ,

R2249EUZ,

R2249RUZ,R2250EUZ,R2250RUZ,R2257EUZ,

R2257RUZ,

R2258EUZ,R2258RUZ

M228RZ,M2229EZ,

M2229RZV

M2230EZ,M2230RZ,

M2249EZ,M2249RZ,M2250EZ,M2250RZ,M2252EZ,

M2252RZ

M2250RUZ

CHASSIS

19M20

19M2OU

19M20Z

19M21

19M21U

19M21Z

19M21UZ

MANUFACTURER

Zenith

Radio

Corp.

6001

Dickens

Ave.

Chicago

39,

Illinois

TYPE

SET

Television

TUBESNineteen

Receiver

POWERSUPPLY110-120

Volts

AC-60

Cycle

RATING

1.6

Amp.

(a>

117

Volts

TUNING

RANGE

Channels

Drive

Cord

Stringing

thru

VHP,

thru

UHF,Video

IF 45. 75 MC,

Sound

IF 41.25 MC

INDEX

6,7

Photographs

(Cont)

(Intercarrier)

Trans.

Inductor

Alignment

Identification

Horizontal

Sweep

Circuit

Adjustments

Servicing

inthe

Field

Parts

List

and

Descriptions

....

Photographs

Cabinet-Rear

View

Chassis-Top

View

Tuner

Resistor

Identification

thru

Schematic

(Alternate

Tuner)

Schematic

(TV)

Trouble

Shooting

Aids

4,9

Tube

Failure

Check

Chart

........

Tube

Placement

Chart

(Bottom

View)

10,

Tube

Placement

Chart

(TopView)

...

14,19

12,

-o

-i

HOWARD

SAMS

CO.,INC.

•

Indianapolis

Indiana

"The

listing

ofany

available

replacement

part

herein

does

not

constitute

inany

case

recommendation,warranty

guaranty

Howard

Sams

Co.,Inc.,

tothe

quality

and

suitability

such

replacement

part.

The

numbers

these

parts

have

beencompiledfrominformationfurnished

Howard

Sams

Co.,

Inc.,

bythe

manufacturers

ofthe

particulartype

replacementpart

listed."

"Reproduction

use,

without

express

permission,

editorial

pictorial

con-

tent,

any

manner,

prohibited.

patent

liability

assumedwithrespect

the

useofthe

informationcontained

herein.

Howard

Sams

Co.,Inc.,Indianapolis

Indiana,

U.S.of

America.Copyrightunder

In-

ternational

CopyrightUnion.

All

rights

reserved

under

Inter-American

Union

(1910)

Howard

Sams

Co.,Inc."Printed

inU.S.of

America

DATE

12-54

SET

259

EOLDER

THE

COOPERATION

OFTHE

MANUFACTURER

THIS

RECEIVER

MAKES

POSSIBLE

BRING

YOU

THISSERVICE

MEASUBED

FROM

PHOTOFACT

STANDARD

NOTATION

SCHEMATIC

©Howard

Sami

Co.,Inc.

1954

PAGE

r»

(/>

t/t

LLJ

SET259

FOLDER

PAGE

CHASSIS

BOTTOM

VIEW-CA

PAGE

JJ28)

(C32J

(C27

W-CAPACITOR

IDENTIFICATION

PAGE

TUBE

PLACEMENTCHART

1ST

VIDEO

TOP

VIEW

INDICATES

BLANK

PINOR

LOCATING

KEYON

TUBESOCKET

SYNC

TUBE

FAILURECHECKCHART

The

following;

chart

lists

tubeswhosefailures

are

most

likely

produce

the

indicatedsymptoms.

Refer

tubeplacementchart

for

location

and

type

tube.

POWER

SUPPLY

FAILURE

raster,

sound

- V18

LOSS

PICTURE

SOUND

pic,

sound,

has

raster

- V2,V3,V4,V5,V6

pic,

sound,

has

snow

VI,

V2,V3

pic,

has

sound,

has

raster

- V6,V7,V19

Has

pic,

sound

- V8,V9,

V10

Overloadedpicture

-V7

SYNC

FAILURE

vert,

sync

VJ,

Vll

Nohoriz.

sync-Vll,

V13,

V14

vert,

horiz.

sync

- Vll

SWEEP

FAILURE

raster,

has

sound

V14,V15,V16,

VI7,

V19,

Fuse

(Ml)

vertical

deflection

- V7,

V12

Poor

vert,

linearity

foldover

V7,

VT2

Poor

horiz.

linearity

foldover

V14,V15,

VI6

Narrow

picture

V14,V16,

V17,

V18

Vert,

off

freq.

- V7,Vll

Horiz.

off

freq.-Vll,V13,

»>

SET

259

FOLDER

PAGE

ALIGNMENT

INSTRUCTIONS

The

high

voltage

lead

should

securely

taped

and

keptaway

from

the

chassis.

Donot

remove

the

horizontal

oscillator

tube (V14)

disable

the

high

voltage

VIDEO

ALIGNMENT

Connect

the

negative

lead

ofa 2

volt

bias

supply

tothe

ungroundedside

C31.

Connect

the

positive

side

chassis.

Connect

the

synchronized

sweepvoltage

from

the

sweepgenerator

tothe

horizontal

input

ofthe

oscilloscope

for

horizontaldeflection.

DUMMY

ANTENNA

470MMF

SWEEP

GENERATOR

COUPLING

High

side

topin

(grid)

6CB6

(V5).

Low

side

chassis.

High

side

point

<^>

Low

side

chassis

SWEEP

GENERATOR

FREQUENCY

43MC

(10MC

Swp)

MARKER

GENERATOR

FREQUENCY

39.75MC

45.75MC

39.75MC

41.25MC

47.25MC

42.75MC

«.OMC

45.75MC

CHANNEL

Any

non

interfer-

ing

channel

CONNECT

SCOPE

Vert.

Amp.thru

10KSJ

point

<$>

Low

side

chassis

ADJUST

A1.A2

A3.A4,

A6,

A7,

A8,A9

REMARKS

Attenuate

generator

output

for3

volts

peak

scope.

Adjust

for

response

curve

maximumamplitude

and

sym-

metry

similar

Fig.

Remove

bias

battery.

Use

maximum

scopegain

amplify

trapregion

response

curve

asin

Fig.

Adjust

for

MINIMUM

marker

amplitude.

Reconnect

bias

supply.

Attenuate

sweepgenerator

output

maintain

not

morethan

voltspeak

peak

scope.

Alternatelyadjust

thru

obtain

response

similar

Fig.

affects

the

high

side

andA7

affects

the

low

side

ofthe

response

curve.

OSCILLATORALIGNMENT

The

master

oscillator

adjustment,A10,

istobe

madeonly

ifthe

individualchannel

oscillator

adjustment

fails

bring

the

channel

within

the

range

ofthe

fine

tuning

control.

channels

thru

fall

within

the

range

ofthe

fine

tuning

control

but

the

higherchannels

not

slight

adjustment

ofA10maybe

necessary

bring

inthe

higher

channels

Connect

the

negativelead

ofthe

bias

supply

tothe

ungroundedside

C31.Connect

the

positive

lead

chassis.

Adjust

for

-1

volt

C31.

Turn

upthe

scopegain

that

the

soundtrap

notch

inthe

responsecurvebecomes

visible,.

Connect

the

synchronizedsweep

voltage

from

the

sweep

generator

tothe

horizontal

input

ofthe

oscilloscope

for

horizontal

deflection.

The

sweepgenerator

output

leadshould

terminated

with

its

characteristic

impedance,usually

ohms.

Setthe

fine

tuningcontrol

tothe

mid-position

ofits

range.

DUMMY

ANTENNA

Two

120S2

Carbon

Resistors

SWEEP

GENERATOR

COUPLING

Acrossantennater-

minalswith

120S2

each

lead.

SWEEP

GENERATOR

FREQUENCY

57MC

(10MC

Swp

(10MC

Swp

69MC

(10MC

Swp

79MC

(10MC

Swp

85MC

(10MC

Swp

177MC

(10MC

Swp

183MC

(10MC

Swp

189MC

(10MC

Swp

195MC

(10MC

Swp

201MC

(10MC

Swp

207MC

(10MC

Swg

213MC

(10MC

Swp

MARKER

GENERATOR

FREQUENCY

59.75MC

65.75MC

71.75MC

81.75MC

87.75MC

179.75MC

185.

SMC

191.75MC

197.75MC

203.75MC

209.75MC

215.75MC

CHANNEL

CONNECT

SCOPE

Vert.

Amp.thru

lOK.fl

point

<£>

Low

side

chassis

ADJUST

All

A12

A13

A14

A15

A16

A17

A18

A19

A20

A21

A22

REMARKS

Adjust

placesound

marker

trap

notch

asin

Fig.

FIG.

FIG.2

FIG.3

FIG.4

PAGE

ALIGNMENT

INSTRUCTIONS

(cont)

AND

MIXER

ALIGNMENT

Remove

the

bias

supply

from

C31and

connect

jumper

from

the

tuner

AGC

lead

(yellow)

chassis.

Connect

the

synchronizedsweepvoltage

from

the

sweep

generator

tothe

horizontalinput

ofthe

oscilloscope

for

horizontal

deflection.

The

sweepgenerator

output

leadshould

terminatedwith

its

characteristic

impedance,

usually

ohms.

DUMMY

ANTENNA

Two

120S2

Carbon

Resistors

SWEEP

GENERATOR

COUPLING

Across

antennater-

minalswith

120S2

each

lead.

SWEEP

GENERATOR

FREQUENCY

69MC

(10MC

Swp)

201MC

(10MC

Swp)

MARKER

GENERATOR

FREQUENCY

67.25MC

71.75MC

199.25MC

203.75MC

CHANNEL

CONNECT

SCOPE

Vert.

Amp.thru

10KS3

point

Low

side

chassis.

ADJUST

A23,

A24,

A25

A26,

A27,

A28

REMARKS

Adjust

for

response

similar

Fig.

Adjust

A26andA27for

symmetrical

response

similar

Fig.

Adjust

A28

for

properbandwidth.Repeat

steps

and

until

best

overall

symmetrical

response

obtained.Removejumper

from

tuner

AGC

terminal

chassis.

SOUND

ALIGNMENT

Connect

attenuator

{Zenith

part

#3-17203

equivalent)

series

with

the

receiverantenna.

Tune

ina

tonemodulated

signal

and

adjust

the

attenuatoruntil

the

signal

falls

below

the

limiting

level

ofthe

6BN6

limiter

detector,

evidenced

bya

hiss

similar

superregeneration.

Adjust

the

sound take-offtransformer(A29,A30)

the

sound

transformer(A31)

andthe

quadrature

coil

(A32)

for

maximumsound

best

quality.

Adjust

the

buzzcontrol

(R9)

for

minimum

intercarrier

buzz.

IIthe

intercarrier

buzzcannot

eliminatedwith

the

buzz

control

check

the

setting

oftheAGC

delaycontroladjustment.

during

the

sound

alignment

the

signal

rises

above

the

limitinglevel

(hiss

disappears)

increase

the

attenuationuntil

the

hiss

returns.

UHF

TUNER

ALIGNMENT

Alignment

oftheUHF

tunershould

notbe

attempted

unless

proper

test

equipment

available.

Switch

the

receiver

totheUHF

position

Connect

the

negative

lead

ofa 2

volt

bias

supply

tothe

ungrounded

side

C31.Connect

the

positive

lead

chassis.

Adjust

the

sweepgeneratoroutput

provide

volts

peak

scope,

Connect

the

synchronizedsweepvoltage

from

the

sweep

generator

tothe

horizontal

input

ofthe

oscilloscope

for

horizontal

deflection.

The

sweepgenerator

output

leadshould

terminated

with

its

characteristic

impedance,

usually

ohms.

DUMMY

ANTENNA

Fig.

SWEEP

GENERATOR

COUPLING

Across

UHF

antenna

terminalsthru

matching

network(Fig.

8).

SWEEP

GENERATOR

FREQUENCY

713MC

(10MC

Swp)

473MC

887MC

(10MC

Swp)

MARKER

GENERATOR

FREQUENCY

711.25MC

471.25MC

885.25MC

CHANNEL

CONNECT

SCOPE

Vert.Amp.thru

IOKSI

point

<$>

Low

side

chassis.

ADJUST

A33.A34,

A35

A36,

A37

A38

REMARKS

Tunerrocket

arm

should

beinthe

horizontal

position.

necessary,

loosen

set

screw

and

adjust

tuner

shaft

that

rocker

armis

horizontal

when

the

channelindicator

isset

channel

54.Donot

adjust

A33

unless

oscillator

calibration

isoff

than

three

channels.

necessary,

adjust

A33to

place

videomarket

at50%on

response

curve

asin

Fig.

The

image(weaker

re-

sponse)

will

appear

also.

The

response

to-

ward

the

counter

clockwiseposition

ofA33

isthe

correct

response.

Adjust

A34and

A35

for

maximumamplitude

and

symmetry

response

similar

Fig*

Check

for

response

similar

Fig.

7.If

oscillator

isoff

morethan

channels

adjust

the

oscillator

travel

(osc.,

mixer

and

ant,

travel

adjustments

arethe

three

round

thumb

screws

ontopof

tuner)adjustment

scale.

Care

must

used

making

this

adjustment

soasnotto

move

the

rocker

armoutofits

bearing.

Setthe

mixer

and

antenna

travel

adjustments

for

maximum

response

scope.

Adjust

A36to

place

video

marker

at50%as

Fig.

Adjust

A37

andA38for

maximum

amplitude

and

symmetry

response

similar

Fig.

•o

-I

«/>

FIG.5

IG.6

FIG.

\ON

CONTINUOUS

TUNER

FIG.

PAGE

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