Zenith A2223Y, A2221Y, A2245E, A2245R, A2250R Disassembly Instructions Manual

PHOTOFACT*

DISASSEMBLY

INSTRUCTIONS

CHASSIS

REMOVAL

1.

Remove 4 push-on type knobs

2.

Remove 6 metal

the

rear

cover.

3.

Remove 4 metal

tuner.

4.

Remove 2 metal screws holding

5.

Remove

6.

Remove 4 chassis

7.

Remove

TRADE

NAME

MANUFACTURER
TYPE

SET
TUBES
POWER

SUPPLY

TUNING

RANGE

the

the

screws

screws

speaker

bolts

chassis.

Television
Seventeen
110-120
Channels 2 thru

Folder

from

from

the

holding

the

the

leads.

from

the

Zenith

Zenith

Radio

Corp.,

Receiver

Volts

AC, 60

the

front.

rear

cover. Remove

tuner. Remove

control bracket.

bottom.

MODELS
A2221J,

Y,

A2251E,

R,

A2221JU,

YU,
A2250MU,
A3001E,

A3000E,

13

RU,

H, R,

R.

6001

Dickens

Cycle RATING

VHF,

14

the

A2223E,
A2282E,

A2223EU,

A2251EU,

A3006E,

A3004,

E, R

Avenue, Chicago

thru

83

UHF, Video

MODEL

A2221YlCh.

H, R, Y,

R,

A2245E,

A2673E, R 17A20

HU, RU, YU,

RU,

A2282EU,

H, R,

17A21Q

185

R,

A2250M,

A2245EU,

A3008E, R 17A20Q

Watts,

IF 45.

RU,

39,

Illinois

1.6

Amp.

75MC, Sound

R,

RU,

A2673EU,

© 117

IF 41.

RU

Volts

17A20)

17A20U

AC

25MC

(Intercarrier)

CHASSIS

TUNER

OSCILLATOR

Touch-up
removing
the
(located
quence
Channel
a
sound.

PICTURE
Remove 4 push-on type knobs

metal
glass

SPECIAL

A.

Observe
where
Back
with

B.
Turn
clockwise approximately
with
fringe
controls

C.
The
location,

The
not
guaranty
and
these parts
to

Howard

H389

adjustment
the

fine

tuning

in a

circle

from

the

13

counter clockwise direction adjusting

constitute
suitability

adjustment

TUBE

screws

out at the top and

ADJUSTMENTS

AGC

the

picture

the

picture

off

from

no

noise

Fringe Lock

the

fringe lock control

hold

controls.

lock counter clockwise until

and

check operation

Focus

focus

may be

see

tube placement chart).

listing

of any

in any

by

Howard

of

have

W.

Sams

ADJUSTMENTS

of the VHF

channel

selector

at the

center

around

highest

SAFETY

holding

and

distorts

this

setting

in the

sound.

If

varied

HOWARD

available replacement part herein does

case a recommendation, warranty

W,

such replacement part.

been compiled

Si

and

of its

the

shaft)

to the

lowest channel

is

located

GLASS

from

knob

escutcheons.

lift

to

remove.

advance

or a

until

fully

1/4

turn.

picture

jitters,

on all

by

means

Sams & Co.,

from

Co.,

Inc.,

SERVICING

oscillator

range.

at 12

CLEANING

the AGC

buzz

the

clockwise,

W.

by the

is

fine

the

picture becomes

Adjust

stable.

channels

of a

Inc.,

information

possible

tuning knobs.

The

should

is

adjustments

be

made

in the

o'clock, proceed

for

best

picture

front. Remove

Tilt

the

control

heard

in the

then

picture

tears,

etc.

Readjust

in the

focus

control.

SAMS & CO., INC.

as to the

The

numbers

furnished

manufacturers

by

Set
in se-

area.

safety

to a

point
sound.
stable

counter

to

lock

adjust

hold

area.

(For

quality

IN THE

D.
The
cated between
sleeve
than

in

and

4

or

of

of

HORIZONTAL
The

control.
chronizes horizontally. (For location,
chart).

SOUND
To

for
see

FUSES

in

the

DATE

FIELD

Width

width

may be

the

in or out of the

necessary

horizontal

eliminate audio
MINIMUM

tube placement

One

fuse

(For

location,

CENTERING
Centering

magnetic

two

is

properly centered.

•

Indianapolis

the

particular
duction
pictorial content,
liability
tion

contained

Indianapolis

3-58

to
OSCILLATOR
oscillator

Adjust

IF

DETECTOR

buzz

is

used

see

is

accomplished mechanically

rings

around

rings

around

type

or

use,

is

assumed

herein. © 1958

5,

varied

by

menas

of a

yoke

and the

yoke

fill

the

for

without

Indiana . Printed

for a

the

screen.

FIELD

coil

is

horizontal hold until

BUZZ

ADJUSTMENT

detector

buzz, adjust

and

maximum sound. (For location,

chart).

horizontal sweep

tube placement chart).

the

neck

the

neck

of the

5,

Indiana

of

replacement part listed. Repro-

express permission,

in any

manner,

with

respect

metallic

picture tube neck.

picture

SLIGHTLY

ADJUSTMENTS

used

as the

the

see

tube placement

the

circuit

by

of the

picture tube. Rotate

tube until

is

prohibited.

to the use of the

Howard

W.

Sams

in

U.S.

sleeve

lo-

Adjust

larger

horizontal hold

picture

syn-

buzz control

protection.

adjusting

the

of

editorial

&Co.,

of

SET

two

picture

No

patent

informa­ America

393

Inc.,

or

FOLDER

4

o

o

m

70

TUNER

VHP
IS-41682
ITOPVIEWI

SCHEMATIC

TUNER PART

\D

ON

PAGE

SWITCH

ON

BI-STABLE

2?

REMOTE

_TRANSFORMER

FOR

CHASSIS

PART

RELAY

CONTROL

PRIMARY]

IS-41941

I7A20Q

5.

21

-i

PQ-1

SOCKET

ON
CONTROLCHASSIS
USED

ON

CHASSIS

REMOTE (ONE

PART
17A21Q

REMOTE WIRING

WAYI

PLUG USED WITH

IS-41940

REMOTE CONTROL

ONLY

CHASSIS

I

MEASURED

6

SEE

VALUE
DC

NOT
ARROWS

WAVEFORMS
SET

PEAK

PAGE

FROM

PIN 7 OF V2.

PARTS

LIST

FOR

OR

COIL

RESISTANCE VALUES

SHOWN

ON

(CONTROL

TO

PRODUCE

SIGNAL

voltmeter;

per

volt.

2. Pin

numbers

bottom

ALTERNATE

APPLICATION

ON

SCHEMATIC DIAGRAM

CONTROLS INDICATE CLOCKWISE

VIEWED FROM SHAFT END)

TAKEN

WITH

50

VOLTS PEAK-TO-

AT

PICTURE

AC

voltage measured

are

counted

of

socket.

2

UNDER

CONTROLS

TUBE.

at

1000

in

clockwise direction

ONE OHM

ohrns

on

ROTATION

3.

Measured

4

Line

5.

All con

Vo

val

taqe
rols

se

stated.

maintained

s

et

for

normal

at 1 17

oper

volts
ation;

pin to

for

no

commor

roltage

signa

negative

read

app

ngs.

ied.

A

PHOTOFACT

STANDARD

Ho»«J

W.

NOTATION

S«ms S Co.,

Inc. 1958

SCHEMATIC

ZENITH MODELS A2221J,
A2250M,

R,

A3OO1E,

MU, R, RU,

H, R,

A2251E,

A3OO4E,

TO

CAP OF

(HORIZ.

OUTPUT)

JU, Y, YU,

EU, R, RU,

R,

A3OO6E,

HV

TRANSFORMER

Vll

TERMINAL

A2223E,

EU, H, HU, R, RU, Y, YU,

A2282E,

H, R,

A3OO8E, R (Ch. 17A2O,

LOCATION

EU, R, RU,

A2673E,

A2245E,

EU, R, RU,

O, U,

EU, R, RU,

A3OOOE,

17A21Q)

PAGE

23

TUBE

PLACEMENT

CHART

OFF-ON

IPUSH-PULU-VOL

> N

0|o^

O u <_

££c

The

following

Refer

to

tube placement

POWER
No

LOSS
No
No
No
Has
Overloaded

SYNC
No
No
No

SWEEP
No
No
Poor
Poor
Narrow picture - V10,
Vert,
Horiz.

TUBE

chart

lists

SUPPLY FAILURE

raster,

no

sound - V14

OF

PICTURE

pic,

no

sound,

pic,

no

sound,

pic,

has

sound,

pic,

no

sound

picture

FAILURE

vert,

sync - V5

horiz.

sync - V5,

vert,

or

horiz.

FAILURE

raster,

has

vertical

deflection

vert,

linearity

horiz.

linearity

off

freq.

- V8

off

freq.

FAILURE CHECK

tubes whose failures

chart

for

location

OR

SOUND

has

raster - VI,

has

snow - V201, V202,

has

raster

- V4, V6, V7

- V5

V9

sync

- V5

sound - Fuse

- V8

or

foldover

or

foldover - V10,

Vll,

- V9,

V10

- V4, V15

(Ml),

V12,

and

V9,

- V8
V14

are

most likely

type

V2,

V3,

V10,

Vll,

of

VI

Vll,

V12

tube.

Mode

CHART

to

produce

(M2),

V12,

V13,

V4

V15

the

indicated

•

symploms.

> M

sa

<•> m X
O

C'

O _ I
00 » C

3- M »

L * -<

-

Cs™

a'*.

m

>

> c

1-

' O »

m

C

SET

393

FOLDER

4

PAGE

3

o

m

JO

PRE-ALIGNMENT
Allow

a 20

minute

VIDEO

IF

ALIGNMENT

Connect

the

The

DUMMY

ANTENNA

470mmf

Direct

SOUND
Connect

until

All,
alignment,

synchronized sweep

sweep

generator output lead should

High
Low

High
tube
mixer-oscillator

(V202).

chassis.

IF

ALIGNMENT

an

adjustable attenuator between

the

signal

A12

and

further reduce

INSTRUCTIONS

warm-up period

SWEEP

GENERATOR

COUPLING

side

to

side

to

side

to

shield

floating

Low

is

below

A13

for

maximum sound

point

^>

chassis.

ungrounded

over

tube

side

to

the

limiting

the

signal until

for the

voltage

GENERATOR

FREQUENCY

.

44MC
(10MC

level

ALIGNMENT

receiver

and

from

the

sweep

be

terminated with

SWEEP

GENERATOR

FREQUENCY

39.

Swp)

41.25MC

45.

39.75MC

41.

47.

41.25MC

42.

45.0MC

45.75MC

the

antenna

of the

and

6BN6

best

quality. Adjust

the

hiss

returns.

test

generator

MARKER

75MC
75MC

25MC
25MC

75MC

and the

(V6)

equipment.

to the

its

characteristic

CHANNEL

Between
any two
channels

receiver

as

evidenced

the

buzz control

INSTRUCTIONS

horizontal input

impedance, usually

Vert.
10K

Low
(across

load).

terminals.

by a

hiss

CONNECT

SCOPE

Amp. thru

to

point

side

to

video

Tune

similar

(Rll)

for

of the

oscilloscope

50

ADJUST

<g>

chassis,

Al,

.

det.

A3, A4,
A5, A6

A7,
A9
Mixer
Plate
Coil

in a

modulated

to

super-regeneration

MINIMUM

buzz.

ohms.

A2

A8,

and

TV

for

horizontal

Set

sweep

peak

to
alternately
with

the 45.
Fig. 1 .
within
if

the

desired
check
their

respective

ends

of the

Connect a clip
chassis.
to

point
adjust
amplitudes

39.

75MC
marker
marker.

Disconnect clip
connect
gain

and
Fig. 3 with
low

side

signal

in the

If the

hiss

deflection.

generator

peak

on

scope.

for

maximum gain

75MC

The

39.

± .

SMC

of the

response

to see

that

coils.

lead

Connect a clip

<E>

. Use

A3

thru

A6 for

as in

marker,

and A5 and A6

lead

to

chassis.

symmetry

markers

of

curve

and

adjust

sound.

disappears

REMARKS

output

Adjust

positioned

75MC

marker

specified

the

cores

windings

from point

high

MINIMUM

Fig.

2. A3

A4

controls

controls

from point

Adjust

of

response

as

and A8

the

attenuator

Adjust

during sound

to

cannot

are

from

lead

scope

for

shown.

affects

A10,

as

from

controls

produce 3 volts

Al and A2

and

symmetry

shown

in

can

fall
frequency.
be

obtained,
entering
opposite

<£>

to

point

<§>

gain

and

marker

41.

25MC

47.

25MC

<£)

and

maximum

similar

to

A7

affects

high

side.

F

MIXER

PLATE
COIL

Nl

IG.I

*S*

FIG.

RF

TUNER-TOP

2

VIEW

FIG.

3

PAGE

4

MIXER
PLATE

CO

IL

IF

OUTPUT

RFAGC

*

MEASURED

A

PHOTOFACT STANDARD

FROM

How,,d

PIN

VC.

3 OF

S.m, & Co.,

V201.

NOTATION

Inc. 1958

CHANNEL SELECTOR SWITCH SHOWN

SCHEMATIC

(DLCtfZl

'aoooEV
'na

'a

'na

'ns

'n 'D

'a

'ni

'ssfrctv

'OZWZl

TUNER

'3E/9tv

'nx

'A

IN

CHANNEL

VHP

TUNER

PAR!

IS-41682

SCHEMATIC

'MD) U '38OOEW

'na

'a

'03

'OH

'scatcw

'H

'03

'na

'a

13

POSITION

'«

'H

'SEECCW

'39OOEW

'na

'a

'ns

'HA

'M

'IfrOOEV

'3isicw

'A

'nr

'a

'na

'rictzw

'H

'31OOCV

'a

'nw

sisaow

"S

'wosctw

PHE-ALIGNMENT

USE

AN

ISOLATION TRANSFORMER

Allow

a 20

minute

VHF

OSCILLATOR ALIGNMENT

Set the

fine

hole

adjustment

RF AND

Connect

the

the
sweep
only

enough

10MC

not

containing adjustable

tuning

just

below

MIXER ALIGNMENT

negative

synchronized sweep

generator

sweep

sweep

unless

GENERATOR

COUPLING

Across

antenna

nals

.

small
oscillator,

VHF

Connect
The
Use
Use
Coils

DUMMY

ANTENNA

Matching

Network

"

-

"

-

INSTRUCTIONS

warm-up

period

to the

center

the

channel

screw

for

lead

of a 2

output lead should

generator

otherwise noted.

SWEEP

cores

termi-

"

"

for the

FOR

of its

13

best

FOR

volt
voltage

output

213MC

207MC

201MC

195MC

18SMC

I83MC

177MC

85MC

79MC

69MC

63

57MC

TUNER

TO

PROTECT

receiver

TUNERS

range

by

oscillator

picture

and

TUNERS

bias

supply

from

the

be

terminated

to

provide a usable

are

adjusted

SWEEP

GENERATOR

FREQUENCY

MC

ALIGNMENT

THE

TEST

and

test

equipment.

#3-41682

AND

S-41683

turning

fine

sound

for

#S-41682

to

point

sweep

with

by

expanding

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.

75 MC

67.25MC

71.

75MC

61.25MC

65.

75MC

55.25MC

59.

75MC

tuning shaft

screw.

each channel

AND

\£> , Positive

generator

its

characteristic

pattern

adjustment

EQUIPMENT.

until

Starting

available.

S-41683

to

to the

horizontal

on

scope.

or

compressing

CHANNEL

13

12

11

10

9

8

7

6

5

4

3

2

INSTRUCTIONS

the

small

index

hole

of the

usually

thru

<§>

.

chassis.

in the

oscilloscope

50

ADJUST

A201

A202

A203

A204

A205

A206

A207

A208,
A209

A210,
A211

A212,
A213

A214,
A215

A216,
A217

with

the

chassis.

impedance,

coil

CONNECT

Vert.

Amp.

10K

to

Low

side

highest channel

input

turns.

SCOPE

point

to

"

"

"

drive

operating

ohms.

cam is

directly

in the

area,

adjust

for

horizontal

deflection.

Adjust

for

maximum

of

response

as

Adjust
of
as
marker
mum

similar

shown.

for

maximum

response

similar

shown. Adjust first

position

gain

and

symmetry.

over

REMARKS

"

to

and

"

"

the

the

appropriate

gain

to

Fig.

gain

Fig,

coil

second

and

and

201

201

for
coil

symmetry

with

markers

symmetry

with

markers

proper

for

maxi-

PAGE

6

F

IG.

201

FIG.202

Rl

Rcvr.

150n

FIG.

203

UHF

ALIGNMENT

Alignment
2

volts
Connect
Use

10MC sweep

DUMMY

ANTENNA

Fig.

203

of the UHF

bias

to the IF AGC

the

synchronized

Across
terminals
ing

network

tuner should

unless

otherwise noted.

SWEEP

GENERATOR

COUPLING

UHF

antenna

thru

match-

(Fig. 203).

TUNER

not be

line

and

adjust

sweep voltage

GENERATOR
FREQUENCY

713MC

473MC

887MC

ALIGNMENT

artemped

unless

the

from

SWEEP

sweep

the

proper

generator

sweep generator

MARKER
GENERATOR
FREQUENCY

711.

25MC

471.

25MC

885.25MC

test

output

to the

CHANNEL

54

14

83

INSTRUCTIONS

equipment

to

is

horizontal

CONNECT

Vert.

Amp.

10K

across

detector

available.

input

SCOPE

load.

provide 3 volts

peak

thru

video

of the

Switch

to

peak

the

on the

oscilloscope

ADJUST

A218,
A219,

A220

A221,

A222,
A223

(cont)

receiver

to the UHF

scope

in the

for

horizontal deflection.

Tuner

rocker
position.
and

adjust
horizontal
channel

54. Do not
oscillator
channels.
place

video

curve

as in
response)
toward

the

A218

is the

and

A220 for maximum amplitude of re-

sponse

similar

Check

for

the

oscillator

adjust

the
mixer

and

the 3 round
adjustment
making

this

the

rocker

mixer

and

maximum
Adjust

A221
Fig. 202. Adjust
mum

gain

202.

position.

following

steps.

REMARKS

arm

should

If

necessary,

the

tuner

when

calibration

If

necessary,
marker
Fig. 202.

will

appear

counter clockwise position

proper

response

is off

oscillator

antenna

screws

to

scale.
adjustment

arm out of its
antenna

response

to

place

and

symmetry

be in a

loosen

so

that

the

channel

adjust

A218

is off

adjust

at 50% on

The
also.

response.

to

Fig. 202.

similar

more

than 3 channels,

travel

travel

adjustments

on top of the UHF

Care

must

so as not to

bearing.

travel

adjustments

on

scope.

marker

A222

and

similar

(oscillator,

Connect

horizontal

the set

arm is

is

unless

A218

to

response

response

Adjust

A219

Fig. 202.

are
tuner)

be

used

move

Set the

for

at 50% as in

for

maxi-

to

Fig.

screw

3

of

rocker

selector
more than

image (weaker
The

to

A223

set at

If

in

>

10

o 2 o

ITEM

V201

C201

C202
C203
C204
C205
C206
C207
C208
C209

C210
C211
C212
C213
C214
C215
C216
C217

No.

ITEM

No.

ITEM

No.

R201

R202
R203
R204
R205
R206
R207

ITEM

L201

L202
L203
L204

L205

TUNER

USE

RF

Amp.

RATING

VOLT

CAP.

12
18

1000
1000

18
12

3.3

8.2

1.8
1000
1000
25
1000

1.0

1.0
5
5
1000
1000

RATING

OHMS

230K
230K

22K

2.

2meg

120K
100

K

1200S2

No

IF

Trap Coil

IF

Trap

Ant.

Trans.

Ant.

Coils

Neut.

USE

Coil

Coil

WATT

22-2679
22-2343
22-2681
22-2428
22-2889
22-2889
22-2671
22-2889
22-2720
22-2714
22-2716
22-2716
22-2889
22-2889

TUBES

ZENITH
PART

22-2679
22-2680
22-2680

ZENITH

PART

20-567

20-567
S-24644
S-23641

20-633

PARTS

(GENERAL

TYPE

6BK7A

Capacity

Capacitors,

No.

All

wattages

No.

ZENITH
PART

No.

NOTES

values

given

and in

AEROVOX

PART

No.

SI 12

SI 12

NPO-SI 3 .
NPO-SI8.2

EF-001
EF-001

N750-SI2.5

EF-001

NPO-SI1.0

EF-001
EF-001

1/2

NOTES

NOTES

Alt.

part
Channel
Wafer

Assy.

LIST

ELECTRIC,

FIXED

in the

mmfd.

CENTRALAB

PART

No.

D6-120

D6-120
TCZ-3R3

:

MFT-1000
MFT-1000
TCN-25
MFT-1000

TCZ-1

MFT-1000
MFT-1000

RESISTORS

watt,

or

less,

COILS

#24645

2-13

AND

DESCRIPTIONS

SYLVANIA)

ITEM

No.

V202

Mixer

-Osc.

CAPACITORS

rating

column

and

REPLACEMENT

No.

otherwise

RATING

OHMS

100K
100K
10K
10K

4700S2
470J2

are in

Ceramic

ERIE

PART

GP-12

GP-12

TCO-3.3
TCO-8.2

TC7-25

TCO-1

for

unless

ITEM

No.

R208
R209

R210
R211

R212
R213

Mica

CORNELL-

DUBILIER

PART
LT6Q12

LT6Q12
C10V33C
C10V82C

C10Q25U

(RF-IF)

ITEM

No.

HF

Coils

L206

Mixer Screen

L207

Coil
Osc.

Coils

L208

Mixer

L209

USE

No.

listed.

WATT

2

2

USE

Plate

mfd.

for

Capacitors.

DATA

MALLORY

PART

No.

UC-5412

UC-5412
ZT-5533

ZENITH

PART

No.

63-317»
63-2398

ZENITH

PART

S-23640

20-632

S-41807
S-41665

Coil

Paper

No.

TYPE

6U8

SPRAGUE
PART

No.

5GA-Q12

5GA-Q12
5TCCB-V33

503C-D1
503C-D1
5TCU-Q25
503C-D1
5TCCB-V1

503C-D1
503C-D1

NOTES

Channel
Wafer

Channel
Wafer

NOTES

NOTES

5%
5%

NPO 5%

N750

N1500

N330

N330

NOTES

Assy.

Assy.

10%

5%
5%

2-13

2-13

10%

m

-<

BB

*"

*

U

m X

o c

-

o _ z

CO » C

SS-"

PAGE

19

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