Watchman FD-30A - High-Voltage Hold Down Circuit Repair

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SERVICE

MANUAL

US

Model

9-963-177-81

Canadian

Model

SUPPLEMENT

No.1

November,

1983

File

this

supplement

with

the

service

manual.

When

repairing

the

following

parts,

make

sure

of

the

operation

of

high

-voltage

hold

down

circuit.

Repairing

portion:

@

Circuit

around

Q803

@

D807,

808,

R812,

813

replacement

®

Circuit

around

0601,

602

Procedure:

1.

Cut

the

pattern

@

of

A

board.

2.

Supply

the

voltage

from

DC

IN

jack

so

that

the

VTVM

reads

7.76

V.

3.

Confirm

that

the

raster

appears

at

that

time.

4.

Supply

the

voltage

from

DC

IN

jack

so

that

the

VTVM

reads

8.77

V.

5.

Confirm

that

the

raster

disappears

at

that

time.

6

Connect

the

pattern

@

and

cut

the

pattern

@.

Then,

repeat

the

steps

2—

5.

7.

After

confirming,

connect

the

pattern

@

.

Note:

When

cutting

pattern

@

,

connect

the

VTVM

on

the

side

of

pattern

©

.

When

cutting

pattern

@

,

connect

the

VTVM

on

the

side

of

pattern

Q.

VTVM

[A

BOARD]

FLAT

B/W

TV-FM

STEREO

/AM

RECEIVER

SON

Y.

English

84D0507-2

Printed

in

Japan

Sony

Corporation

©

1983

B.W

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