Magnavox U26-O1AA, U26-O3AA, U26-O2AA, U26-O4AA, V26-O1AA Disassembly Instructions Manual

PHOTOFACT*

Fold

er

MAGNAVOX

-O4AA,

V26-O1AA,

AMP-142CC,

CHASSIS

U26-O1AA, -O2AA, -O3AA,

-O2AA, -O3AA, -O4AA,

AMP-169AA,

CR-745BB

(26

Series)

DISASSEMBLY

CHASSIS

REMOVAL

1.

Remove 2 knob

on

type

control

2.

Remove

the

rear

cover.

3.

Remove i plugs from

4.

Remove 2 tuner

5.

Remove Phono input plug

6.

Remove 2 wood

7.

Remove 8 chassis

8.

Remove

9.

Remove 1 wood

10.

Use the

and

remove

the

control

11.

Remove

12.

Remove 1 wood

13.

Remove 4 wood

14.

Remove

TRADE

NAME

MANUFACTURER TYPE

SET

TUBES

Twenty

POWER

SUPPLY

TUNING

RANGE Channels 2 thru

FOR

SERVICE INFORMATION

9. FOR

SERVICE INFORMATION

escutcheons

knobs.

10

wood

screws

control

plugs.

screws

holding

bolts

the

chassis.

screw

holding

special

spanner

2 hex

nuts from

unit

and

tuner

assembly.

speaker

leads.

screw

holding

screws

the

amplifier

Magnavox CHASSIS

Television

chassis.

Magnavox

110-120

INSTRUCTIONS

from

the

front

and 10

push-

holding

the

rear

cover.

Remove

unit.

and

Amplifier

from

the

wrench included with

the

front

holding

Co.,

Receiver

Volts

ON

plugs.

the top

chassis

braces.

bottom.

antenna

terminal

control

Remove

the

speaker

the

amplifier

U26-01AA, U26-02AA, U26-03AA,

2131

Bueter

AC,

60

Cycle

13

VHF,

CHASSIS AMP-142CC REFER ON

CHASSIS AMP-169AA & CR-745BB REFER

board.

the

cabinet

shafts holding

the

assembly.

terminal

board.

chassis.

V26-01AA

U26-04AA, V26-02AA, V26-04AA, AMP-169AA, V28-03AA, AMP-142CC, CR-745BB

Road,

RATING

14

thru

83

SERVICING

Fort

Wayne

UHF, Video

TO

IN THE

4,

Ind.

215

Watts, 2 Amp.

IF 45.

SIMILAR

75MC, Sound

UNIT

IN

PHOTOFACT

TO

FOLDERS

FIELD

® 117

IF 41.

Control

Volta

AC (TV

25MC

(Intercarrier)

SET 311 -

8 & 9 OF

Unit

700660

only)

FOLDER

THIS SET.

r>

-

r>

< X

IS!

zi

£8?

m

> O *>§ w i >

O

>

=.

>

i

Ul

^

I

O

TUNER

OSCILLATOR ADJUSTMENTS

Touch-up

adjustment

removing

the

Fine

Tuning

are

accessible,

rotated.

Adjust PICTURE Remove 6 wood

the FOCUS The

the

not guaranty and these to

H519

TUBE SAFETY GLASS

safety

glass

focus

may be

Focus

Adjustment

The

listing

constitute

by

Howard

suitability

parts

Howard

have been compiled

W.

of the VHF

Channel

Selector

at the

one at a

for

best

screws

out at the top and

varied

board.

HOWARD

of any

available replacement part herein

in any

case a recommendation, warranty

W.

of

such replacement

Sams & Co.,

and

center

of its

time,

as the

picture

from

the top

in

steps

Sams & Co.,

from

Inc.,

HORIZONTAL

Oscillator

and

CLEANING

lift

by the

is

Fine Tuning knobs.

range.

metal

W.

part.

possible

The

Channel

sound.

trim

up to

remove.

position

SAMS & CO., INC. • Indianapolis

Inc.,

as to the

The

information

manufacturers

adjustments

Selector

strip.

Tilt

of a

plug

does

quality

numbers

furnished

by

Set

is

or

of of

In

For

adjustment

to

remove Horizontal Horizontal horizontally.

FUSES

One

fuse

(For

location, CENTERING Centering

two

magnetic Rotate picture

the

particular type duction pictorial content, liability tion

contained

Indianapolis

DATE

6-58

OSCILLATOR FIELD ADJUSTMENTS

of the

the

Hold Frequency

Is

used

is

accomplished mechanically

the two

is

properly

or

use,

is

assumed

5,

Horizontal

rear

cover

at the

center

slug

(For

location,

for

Horizontal

see

tube

placement

rings

around

rings

around

centered.

5,

of

replacement part

without

express

in any

with

Indiana . Printed

and

supply

of

(Bl)

until

see

Sweep

the

neck

the

neck

Indiana

permission,

manner,

respect

Oscillator, its tube

chart.)

is

to the use of the

power

to

range

and

the

picture

placement

circuit

by

of the

picture

of the

tube until

listed.

prohibited.

W.

Sams & Co.,

in

U.S.

it is

necessary

set.

Set the

adjust

synchronizes chart.)

protection.

adjusting

tube.

Repro-

of

editorial

No

informa-

of

America

SET

the

or

patent

Inc.,

404

FOLDER

3

ADDITIONAL

SCHEMATIC

PAGE

VHP

TUNER

*700662-1&

UHF-VHF

TUNER

UHF

TUNER

1700530-3

DC

COIL

NOT

SHOWN

ARROWS

(CONTROL

WAVEFORMS SET

TO

PEAK

SIGNAL

,

nr

vol

per Pin

2

bot

SCHEMATICS

*700663-1

RESISTANCE

ON

CONTROLS

VIEWED

TAKEN

PRODUCE

AT

voltage meter;

volt.

numbe

torn

of

socket.

VALUES

SCHEMATIC

INDICATE

FROM

WITH

CONTROLS

50

VOLTS

PICTURE

TUBE.

measurements taken AC

voltage

measured

UNDER

DIAGRAM

.CLOCKWISE

SHAFT

PEAK-TO-

with

vacuum

at

1000

ONE OHM

END)

tube

ohms

ROTATION

-asured

va

3

M

unless otherwise stated.

4.

Li

ie

Voltage

5.

A

controls

set

A

PHOTOFACT STANDARD

ues

ore

maintained

for

normal

How.,J

from

socket

at

W.

S.m, I Co.,

pinto common

117

volts

operat.on

NOTATION

for

no

I.e.

voltage

signal

1958

negative

readings.

applied.

SCHEMATIC

PAGE

2

USED

IN I 22K

CHASSIS A 1W

26-01AA

-X

1

T^v

240V

\L

PLUC

&

SOCKET

AGC

CLAMPER

®6AT6

12

VOLTAGE

®

6DG6GT

DIVIDER

MAGNAVOX

CHASSIS

-O4AA, V26-O1AA, -O2AA, -O3AA, -O4AA,

AMP-142CC,

U26-O1AA,

AMP-169AA,

-O2AA,

CR-745BB

(26

Series)

PAGE

-O3AA,

19

TUBE

PLACEMENT

CHART

AC

RECPT

ri/-

OFF-

VZOZ 6CG8~

MIXER

OSC

HORIZ HOLD VERT HOLD

\o/

AUDIO

INPUT

' V ^

LOUDNESS

ON

ITVI

TREBLE

OFF-ON

(PUSH

BRIGHTNESS

\L

PANEL

f^

BASS OFF-ON

PHONO

VZ01

RFAMP

PULL)

AC

RECPT

1AMPI

±]

J

V14 \ V15

"1

6CD6GA I ^

HORIZ

OUTPUT DAMPER

TOP

VIEW

1STVIDEOIFAMP

6AU4GTA

2ND

VaTAGE

VIDEO

DIVIDER

/T\

>—s*

IF AMP 3RD

60G6GT

I

HORIZ-AFC^ ^ (J

VIDEO

IF AMP

) ( O )

>

S ' O

7gz

n

- O

n

< X

in u '

01 > '

w

C O

The

following

POWER

SUPPLY FAILURE

No

raster,

SWEEP FAILURE No

raster,

No

vertical

Poor

vert,

Poor

horiz.

Narrow

picture

Vert,

off

Horiz.

off

chart

no

sound

has

sound

deflection

linearity

freq.

Vll

freq.

lists

V13,

V13

tubes

whose

V17

Fuse

(M2),

VII,

or

foldover

or

foldover V13,

V14,

V15,

V12

failures

Rectifier Vll, V17

TUBE FAILURE CHECK

are

most

likely

to

produce indicated

(Ml),

VIS.W,

V15,

V16.V18

V12 V14,

V15

symptoms. LOSS

OF

No

pic,

no

No

pic,

no

No

pic,

has

Has

pic,

no

Overloaded

SYNC

FAILURE

No

vert,

sync

No

horiz.

No

vert,

or

CHART

Refer

to

PICTURE

OH

sound,

has

sound,

has

sound,

has

sound

V6,

picture

V5

V10

sync

V10,

horiz.

sync

tube placement

SOUND

raster

VI,

snow

V201,

raster

V4,

VI,

V9

Ml

V10

V2,

V202,

V18,

chart

V3,

V9

for

Diode

VI,

location

(M3),

V9

and

type

V4, V9

9

>

n

i

to. O

»'-

y

Wl

>

of

tube.

O

s

70

SET

404

FOLDER

3

PAGE

3

ALIGNMENT

INSTRUCTIONS

PRE-ALIGNMENT The

high

voltage lead should

Allow

a 20

minute warm-up period

VIDEO

IF

ALIGNMENT

Connect

the the

the Sweep only

enough

10MC

sweep unless

Mixer

High of to

Place a thin metal Mixer and the Generator strip. sis.

IF

the

Contrast control

in a

strong

the

terminals

the

Fine

A9,

the

SMC

TRAP

in a TV

the

horizontal

negative lead negative synchronized

Generator

6BZ6 chassis.

tube

high

ALIGNMENT

signal strength

AID

Fine

Connect Connect The Use Use Detune

DUMMY

ANTENNA

.

OOlmfd

Direct

SOUND Turn

Tune Reduce antenna Tune Adjust Readjust

4. Tune

until

INSTRUCTIONS

lead

output

Sweep

Generator

otherwise

Plate

coil

SWEEP

GENERATOR

COUPLING

side

to

pin 1 (grid)

(VI).

Low

"

insulated

strip

between

-Osc.

tube

shield.

side

of

to the

Low

side

TV

signal

so

that

Tuning

thru

and All for

Tuning

ALIGNMENT

station

and

scanning

be

securely taped

for the

of a

1. 5 volt volt

Was

voltage

lead should

output

noted.

GENERATOR

FREQUENCY

43.

side

the

chas-

clockwise

disconnecting

the

Volume

the

Fine

lines

are

Was

SWEEP

SMC

with a tone signal

sound.

distortion.

Tuning

smooth

of a 3 sweep

by

turning core

(V202),

Connect

Sweep

metal

to

fully

(preferably

by

with

undistorted MINIMUM

during adjustments

turn

and

kept

receiver

supply

from

be

terminated

to

provide a usable pattern

fully

"

and A8

the

control

away

and

test

to

point

<A> . Positive

to

point

the

counter clockwise.

Set the

of A9,

<3|> . Positive

sweep

generator

with

MARKER

GENERATOR

FREQUENCY

47.

25MC

42.

25MC

45.0MC

45.

75MC

47.25MC

41. 25 MC

41.25MC

42.

25MC

45. OMC

45.

75MC

fully

counter clockwise.

or

antenna

or

connecting

set

fully

clockwise

Fine

A10

and All to

slowly clockwise until

and

continuous.

from

the

chassis.

equipment.

to

chassis.

to

chassis.

to the

its

music).

Tuning

horizontal input

characteristic

CHANNEL

Any interfering channel

•

impedance, usually

on

scope.

non-

Vert. Amp. 10K Low (Across Video Det. load).

Adjust

A8

an

adjustable

the

sound

to the

verge

keep

it at the

4.

BMC

beat interference becomes visible

CONNECT

SCOPE

to

point

side

to

just

past

attenuator

is at a low

of

distortion.

verge

of the

thru

<@>

.

chassis.

"

the

of

distortion.

oscilloscope

point

between

level.

for

50

ADJUST

Al, A2

A3,

A5

A6

A7& Mixer Plate CoU

of

ohms.

horizontal deflection.

Adjust

to

points

are

slug farthest counterclockwise.

A4,

Adjust

for response as

shown.

Adjust

to

points

are

slug farthest counterclockwise.

Adjust

for response shown. mum

gain

Adjust

A7 for

Due

to

interaction

repeat adjustment. Recheck

maximum

sound

the

antenna

in the

place marker

found

to do

maximum gain

similar

place marker

found

to do

maximum

similar

Adjust

Mixer

with

45.

maximum gain

and

MINIMUM

leads

and the

picture.

REMARKS

in

this,

to

Fig. 1 with

in

this,

gain

to

Fig. 1 with

Plate

75MC

it may be

receiver

Adjust

trap

notch.

use the one

and

symmetry

trap

notch.

use one

and

symmetry

coll

marker

and

necessary

step

distortion.

A12

If two

markers

If two

with

markers for

maxi-

at

50%.

proper

3.

to

with

of

of as

tilt.

PAGE

4

TUNER

ALIGNMENT

INSTRUCTIONS LOCATED

F

IG

ON

PAGE6.

A

PHOTOFACT

VALUE

OR

STANDARD

Howard

W.

APPLICATION

S.ms

S,

NOTATION

Co.,

Inc. 1958

SCHEMATIC

MIXER

Y2ffl>6CG8

MIXER

PLATE

COIL

VHF

TUNER

#700662-1, UHF-VHF

TUNER

#700663-1

MIXER

PLATE

COIL

RF

TUNER

TOP

VIEW

SET 404

FOLDER

3

PAGE

5

PRE-ALIGNMENT

The

high

Allow

a 20

VHP

OSCILLATOR

Connect

the

Connect

variable Connect The

Sweep

Use

only enough Sweep

Use

10MC sweep

Set

the

Fine

DUMMY

ANTENNA

Two

UOS1

Carbon

Resistors

VHF

RF AND

This

portion

UHF

TUNER

_

.

This

protion

INSTRUCTIONS

voltage lead

the

lead.

should

minute

warm-up

ALIGNMENT

negative

lead

bias

to IF AGC

synchronized sweep voltage

Generator

output

Generator

unless

Tuning

Across nals

otherwise noted.

to the

SWEEP

GENERATOR

COUPLING

antenna

with

12012

in

MIXER

ALIGNMENT

of the

receiver

_^________

of the

receiver

TUNER

be

securely

period

for the

of a 1, 5

volt

bias

line.

Adjust

lead should

output

center

of its

GENERATOR FREQUENCY

termi-

213

each

(10MC 207MC (10MC 201MC (10MC

195MC

(10MC 189MC (10MC

183MC

(10MC

177MC

(10MC 85MC (10MC 79MC (10MC

69MC

(10MC

63MC

(10MC

57MC

(10MC

has

been properly aligned

has

been

properly

range.

ALIGNMENT

taped

and

kept

receiver

supply

from

be

terminated with

to

provide a usable

SWEEP

MC

Swp)

;iwp)

Swp)

away

and

test

to

point

bias

to

obtain response curve

the

sweep generator

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.

75MC

67.25MC

71.75MC

61. 2

SMC

65.

75MC

55.25MC

59.

75MC

at the

aligned

at the

from

the

chassis.

equipment.

^> . Positive

to the

its

characteristic

pattern

on

CHANNEL

13

u u

10

9

8

7

6

5

4

3

2

factory

and is

—

factory

and is

INSTRUCTIONS

to

chassis.

which

horizontal

impedance, usually

scope.

Vert. Amp. thru 47K

across

Detector load.

very

stable.

very

stable.

shows

input

CONNECT

SCOPE

Video

Alignment

no

indication

of the

of

overloading.

oscilloscope

50

ohms.

ADJUST

(U01

A204

A203

A204

A205

A206

A207

A208

A209

A210

A211

A212

of

this

of

this

for

horizontal deflection.

Adjust

to

place sound marker

notch

as in

Fig. 201.

fall

at

50%.

portion should

portion

should

not be

REMARKS

Video

required

in

trap

marker should

in the

field.

in the

field.

FIG.201

RF

TUNER-BOTTOM

VIEW

PAGE

6

Magnavox U26-O1AA, U26-O3AA, U26-O2AA, U26-O4AA, V26-O1AA Disassembly Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual