Motorola vt 73, ts 4j schematic

PHOTOFACT*

CHANNEL

SELECTOR

Fold

er

MOTOROLA MODELS

(Ch.

TS-4J

VT-73,

LATE)

VT-73A

I

VOL

CONT

ON-OFF

TRADE

NAME

MANUFACTURER

TYPE

SET

TUBES

Sixteen

POWER

SUPPIY

TUNING

RANGE-Channels 2 thru

Alignment Block

Diagram

Disassembly

HV

Rectifier

Adjustment

Parts

List

Photographs

Cabinet-Rear

SW

FINE TUNING CONTRAST CONT.

Motorola

Portable

110-120

Instructions

Feedback

and

Description

View

Model

VT-73,

Inc.,

4545

Television

Volts

AC-60

13

Spring

VT-73A

Augusta

Receiver

Cycle

14,15,16

(Chassis

Blvd.,

TS-4J

Chicago

RATING:

Late)

51,

INDEX

6,7

Photographs (continued)

13

Capacitor

10

Chassis-Top

Resistor

10

Trans.,

Identification

Schematic

10

Tube Placement Chart

Voltage

and

Illinois

.95

Amp. @ 117

Volts

Identification

View

Identification

Inductor

and

Alignment

Resistance Measurements

s

5

64

AC

11,18

3

12,17

4,9

2

b

8

HOWARD

"The listing

of any

available case a recommendation, warranty as

to the

quality parts Inc.,

by the

"Reproduction

and

have been compiled

manufacturers

or

suitability

from

of the

use, without

replacement

of information furnished

express

W.

part

or

guaranty

such

replacement

particular type

permission,

SAMS & CO., INC. • Indianapolis

tent,

in any

herein does by

Howard

part.

to

Howard

of

replacement

of

editorial

not

constitute

W.

Sams & Co., Inc.,

The

numbers

W.

Sams & Co.,

part

or

pictorial

in any

of

these

listed."

con-

manner,

the

use of the Sams & Co., Inc., ternational

Copyright Union.

Union

(1910)

by

information

Howard

7,

Indiana

is

prohibited.

No

patent

contained

Indianapolis

7,

Indiana,

All rights

W.

Sams & Co., Inc." Printed

DATE 10/49

liability

herein. Copyright

reserved

SET

is

U. S. of

America. Copyright under

under

NO..

assumed with respect

1949

by

Inter-American Copyright

in U. S. of

71

FOLDER

Howard

America

12

W.

to

In-

•

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.

RECEIVER

—

1000

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"""

MMF

77

THE

COOPERATION

MAKES

(JH)<

IT

>

IK

OF THE

POSSIBLE

MANUFACTURER

TO

BRING

YOU

OF

THIS

SERVICE

V-HIH-H-

® ® I 3

37-^

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i

® " ® ®

. 1 A

(jg)

V-/

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MFD - MFD

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120

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100

MFD ' urn

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5

PAGE

2

I

®6AU6

i

AUDIO OUTPUT

(ra)25L66T_

A

PHOTOFACT

STANDARD

©Howard

NOTATION

W.

Sams & Co., Inc. 1949

SCHEMATIC

3RD

6AS5

v_y

VDEO

I I

6AG5 ) I

v_y

If

3ND

v^x

VIDEO

IF

1ST

6AG5

VIDEO

I

IF

TOP

VIEW

I

ll2AT7J

cony.

BOTTOM

IBAG&

VIDEO

VIEW

6A&5

j

X '

IF

3RD

VIOEC

IF

TUBE PLACEMENT CHART

©

SOUND

«(

"'

v_y

}

PAGE

5

If

set is to be

socket.

It

Is

recommended

Indications

ator capacitor,

DUMMY

ANTENNA

.001MFD

1.

2.

.001MFD

Connect

horizontal deflection.

DUMMY

ANTENNA

1.

.001MFD

2.

.001MFD

DUMMY

ANTENNA

.001MFD

3.

4.

.001MFD

Reconnect

DUMMY

ANTENNA

.OOU1FD

5.

.001MFD

6.

.OOMFD

7.

.001MFD

8.

.001MFD

9.

.001MFD

10.

.001MFD

11.

.001MFD

12.

which

1.

Unsolder

2.

Disconnect

3.

Disconnect

When

using

Use

isolation

and B-.

When

using

in

High

side

(Grid)

Low

side

the

High

side (Grid) Low

side

High

side

(Grid)

Low

side

High

side

(Grid) (V2).

B-.

the RF

High

side

(Grid)

Low

side

GENERATOR

ALIGNMENT

aligned

with

picture tube

the

following

might

result

the low

1

(V6).

1

(V3)

to

L26

1

(VI)

in

resistor

RF

choke

If

available.

without

SOUND

SIGNAL GENERATOR FREQUENCY

4.5M3

(Unmod.)

n

SOUND

sweep

SWEEP GENERATOR FREQUENCY

4.

SMC

(450KC

Sweep)

n

SWEEP GENERATOR FREQUENCY

251*

(10MC

Sweep)

in the

SIGNAL GENERATOR FREQUENCY

81.45MC (Unmod.

or

87.45MC

93.45MC

103.45MC

109.45MC

152.35MC

158.35MC

or

164.35MC

170.35MC

or

176.35MC

182.35MC

or

189

.35MC

one end of

the

yellow lead

one end of

an

oscilloscope, a 1000HMF transformer

an

oscilloscope

series

with

SIGNAL

COUPLING

to

of

6AU6

(V6),

to B-.

"

synchronized

SWEEP

COUPLING

to

of

6AU6

to

B-

.

it

SWEEP

GENERATOR

COUPLING

to

of

6AG5

to

B-.

to pin 2

of

'12AT7

Low

side

choke

SIGNAL

GENERATOR

COUPLING

to

'of

6AG5

to B-.

• » "

n

V

n

removed.

circuits

mis-alignment. connected

side

IF

voltage

changes

R74

connected

to the

L26

to

disable

capacitor

If not

an

isolation

of

the

ALIGNMENT

CHANNEL

Any

IF

ALIGNMENT

from

MARKER

GENERATOR

FREQUENCY

4.5MC

MARKER GENERATOR FREQUENCY

23.5M3

27.

ore

22.

4M3

26.4M3

OSCILLATOR ALIGNMENT

oscillator

MARKER

GENERATOR

FREQUENCY

Not

Used

)

n

» "

II

"

ii

INSTRUCTIONS

It

will

be

necessary

be

made

during alignment

between

pins

local

be

connected

a .

and B-.

SIGNAL

GENERATOR

AD

VTVM

ADJUST

to

Point

thru

to

Point

thru

SIGNAL

generator

Vert. Polnt<S> to

B-.

Vert. Point<§>

to

B-.

MMENT

Vert.

Po

int

<^

side

to-B-.

Vert.

Polnt<E> side

to B-.

6 and 8 of V14 oscillator. 1MFD

capacitor

A1,A2

A3

GENERATOR

to the

CONNECT

SCOPE

Amp.

to

Low

Amp.

to

Low

CONNECT

SCOPE

Amp.

to

Low

n

Set

fine

CONNECT

SCOPE

Amp.

to

Low

" « »

n

"

II

"

horizontal output transformer

the should connect

transformer connect a 10MFD

oscilloscope

USING

AM

CONNECT

JC

Probe

a

Common

IOK2

resistor

to

B-.

X

Probe

a

Common

<

lOKffi

to B-.

USING

FM

the

signal

CHANNEL

Any

n

VII

EO

IF

ALIG

CHANNEL

Any

cathode

circuit.

CHANNEL

2

or 3

4

5 6 7

8

or

9 10

or

11 12

or

13

to

short

of the

(High

across

the

In

capacitor,

AND

VTVM

HIST

Adjust

negative side

AND

OSCILLOSCOPE

horizontal

ADJUST

A1,A2

side

A3

side

ADJUST

A4,A5,

A6

A7,A8

tuning control

ADJUST

A9

A10 All A12 A13 A14-

A15

A16

pins

1 and 14 on the

receiver

voltage

(T3).

vertical

series

for

reading

of the

Disconnect maximum

per

Reconnect

occurs Fig maximum

of

Adjust markers

Adjust

markers

Adjust

Indicated trace wide resonance.

to

prevent erroneous

Oscillator.)

input

with

maximum

zero reading. A positive

correct

Input

Fig

2.

diagonal

to mid

traces

terminals.

low

side

in

parallel

REMARKS

deflection.

will

be

setting.

of the

capacitor

amplitude

1.

C4.

Adjust

at

center

Slightly

amplitude

line.

for

response curve

as

shown

for

response

as

shown

position.

for

zero

by a

that

appears

as

" " "

n

"

n

11

picture tube

of

signal

genera

with

an

.005

obtained

oscilloscope

REMARKS

and

of

pattern

retouch

and

REMARKS

In

Fig 3.

in Fig 4.

REMARKS

beat.

sharply defined

between

coil

is

and

on

for

C4.

Adjust

symmetry

A3 so

marker

as per

A2 for

straightness

with

curve

with

This

is two

tuned

either

for

as

thru

PAGE

6

FIG.

I

FIG.2

3

"

Disconnect W choke

careler

frequency

DUMMY

ANTENNA

High

Direct

ISA

13B

14.

15.

16.

17.

ISA

B

14.

15.

16.

Direct

DUMMY

ANTENNA

Direct

There

are no

follows,

A.

If

B.

If

DUMMY

ANTENNA

Direct

For

channels 7 thru

output

"A"

on

minal

side

High

"A" minal, side

using

channels channels

High

"A" minal side

indicator, a VTVM,

ALIGNMENT INSTRUCTIONS CCONTJ

L26

ana

then

SWEEP

GENERATOR

COUPLING

side

to

lower

antenna

ter-

strip.

Low

to"G".

11

n

CHANNELS 5 AND

SIGNAL

GENERATOR

COUPLING

side

to

on

lower

antenna

ter-

strip.

Low

to

"G".

n

antenna

coil

AM

signal 8, 10 and 9, 11 and 13 are to be set up,

SIGNAL

GENERATOR

COUPLING

side

to

lower

antenna

"G".

n

Low

ter-

strip.

to

13

in

oscillator

the

RF

coils

SWEEP GENERATOR FREQUENCY

57M3

done

Sweep)

63MC

(10M3

Sweep) 69MC

(1OTE

Sweep)

ARE

ALIGNED

6

SIGNAL

GENERATOR

FREQUENCY

77.25MC (400%

3056

Mod.)

81.75MC (400%

3056

Mod.)

83.25MC

(400%

Mod.)

87.75MC

(400% 3054

Mod.)

adjustments generator

12

are to set up,

SIGNAL GENERATOR FREQUENCY

55.25MC

(Unmod.)

59.75MC

(Unmod.)

61.25MC

(Unmod.)

65.75MC

(Unmod.)

67.25M3

(Unmod.)

71.75MC

(

Unmod . )

77.35MC

(Unmod.)

81.75MC

(Unmod.)

83.25MC

(Unmod.)

87.75MC

(Unmod.)

follow

same

connected

GENERATOR FREQUENCY

3056

for

and

procedure

as

OF

ALIGNMENT

cathode

are

MARKER

55.25MC

59.75M3

61.25M3

65.75MC

67.25M3

71.75MC

WITH

CHANNEL

5

6

CHANNEL

circuit.

adjusted

CHANNEL

2

3

AM

SIGNAL

Vert . Amp . to Polnt<g>.

to

channels 7 thru

oscilloscope

adjust

ALTERNATE

2

f

3

4

5

6

as

above,

may be

,

Note

that

the

antenna

coils

are

tunea

«rst

u,

mo

A17 (RF

coll

adj.)

symmetry

A19 (RF

Adj.)

symmetry

amplitude

at

87.75MC.

9.

and RF

for

as an

v^^»

coll

Coil

at

83.25MC

as

coils

maximum

for

as

for

as

to the

4

GENERATOR CONNECT SCOPE

Low

chassis.

as

A25 for

adjust

RF

ALIGNMENT

CONNECT

VTVM

Probe Low

side

w

outlined

used.

sound

CONNECT

SCOPE

Vert.

Amp

Point

<JJ>

to

B-X

rt

INSTEAD

side

13. The RF

above:

maximum

A25 for

to

Point to

in

step

carrier

to

Low

side

ADJUST

A22 A21

A24 A23

colls

response

maximum

ADJUST

A18

AI7

A18 A17

A20 A19

A22 A21

A24 A23

17.

Instead

frequency.

ADJUST

A17, A18

A17,

A18

A19, A20

1

SWEEP

0

Adjust

A22 for

77.25MC

81.75MC.

Adjust

A24 for

and

A23 for

for

these channels

at

response

Alternately at

their

deflection.

of a

REMARKS

Alternately adj.) maximum

per

Alternately adjust adj.) maximum

per

GENERATOR

and A21 for

maximum

195M3

at

189MC

designated frequencies

scope

and A18

amplitude

Fig 5.

and A20

amplitude

Fig 5.

REMARKS

maximum

on

channel

on

REMARKS

align

the

being used

adjust

(Ant.

and

(Ant. Coll

and

amplitude

are

adjusted

10.

channel

antenna

n

I

5

73

o

FIG.4

FIG.

5

PAGE?