Sony FD-525 Service manual

FD-525

SERVICE MANUAL

US Model

SPECIFICATIONS

TV standard Channel coverage

Radio frequency range

Antenna Picture tube

Input

output

Speaker Power requirements 12 V DC Battery life Power consumption 10.8 W Dimensions

Mass Approx. 2.8 kg (6 lb 3 oz) Supplied accessory AC power adaptor (1)

Design and specifications are subject to change without notice.

Note Use only recommended AC power adaptor. Do not use any other AC power adaptor.

American TV standard VHF channels 2-13 UHF channels 14-69

FM 87.6-l 08 MHz AM 530-l ,710 kHz

VHF/UHF/FM: telescopic antenna

AM: Built-in ferrite

4.5-inch picture measured diagonally

EXT ANT: minijack, 75 ohms

EAR: minijack, impedance 8-300 ohms

Full

range

See page 4 for “Power sources.” Approx. 176.2 x 177x 175.5 mm (w/h/d)

incl. projecting

incl.

(7 x 7 x 7 inches)

batteries

bar antenna

05 cm (02 inches)

pans

and controls

sound suitable for garden and kitchen use.

COMPONENTS IDENTIFIED BY MARK A OR DOTTED LINE WITH MARK A ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN

LISHED BY SONY.

FEATURES

4.5inch black and white 90” deflection picture tube. The voltage synthesizer tuning system allows easy tuning. AM/FM tuner is combined.

Built-in e-inch dia. speaker with powerful output and good Carrying handle for easy carrying.

SAFETY-RELATED COMPONENT WARNING!!

:lN

THIS MANUAL OR IN SUPPLEMENTS PUB-

Polarity of the plug

BLACK AND WHITE

TV-AM/FM TUNER

SONY@

NOTEONTHEANODECAPREMOVAL

Even when the power switch is off, the voltage at the anode cap is still high.

Remove the anode cap as follows.

Discharge the anode pin to the ground.

Pinch and remove the anode pin with a pair of tweezers. At this time, be careful not to scratch the anode button.

Caution on Reinstallation : Confirm that the anode button is inserted into the anode cap securely.

Section

1. GENERAL

Location of Controls.

Power Sources

Watching the TV

Listening to the Radio

External Antenna Connection

.................

......................

....................

................

2. DISASSEMBLY

2-1.

Cabinet (rear) ....................

2-2.

A Board ........................

2-3. Cathode-ray Tube

R Board ........................

2-4. 2-5.

Pointer Setting

................

..................

........

. . . . . . .

.......

TABLEOFCONTENTS

Section

3. ELECTRICAL ADJUSTMENTS

.......

4 4 4 5 5

6 6 6 6 6

3-1. Tuner Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2. TV Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. DIAGRAMS

4.1.

Semiconductor Lead Layouts

4-2.

Block Diagram .............................

4-3.

Printed Wiring Boards

4.4.

Schematic Diagram

5. EXPLODED VIEWS

5-1. Rear Cabinet Section . . . . . . . . . . . . . . . . . . . . . . .

5-2.

Front Cabinet Section

ELECTRICAL PARTS LIST

............... . ..lO

.....................

.........................

. . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . .

. . . .

. . .

. ..19 . . . 20

. ..21

-2-

SAFETY CHECK-OUT

After correcting the original service problem, perform the following safety checks before releasing the set to the customer:

Check the area of your repair for unsoldered or poorly-soldered connections. Check the entire board surface for solder splashes and bridges.

Check the interboard wiring to ensure that no

wires are “pinched” or contact high-wattage

resistors.

Check that all control knobs, shields, covers, ground straps, and mounting hardware have been replaced. Be absolutely certain that you have replaced all the insulators.

Look for unauthorized replacement parts, particularly transistors, that were installed during a previous repair. Point them out to the customer and recommend their replacement.

Look for parts which, though functioning, show

obvious signs of deterioration. Point them out

to the customer and recommend their replacement.

Check the line cord for cracks and abrasion.

Recommend the replacement of any such line cord to the customer.

Check the condition of the monopole antenna

(if any).

Make sure the end is not broken off, and has the plastic cap on it. Point out the danger of

impalement on a broken antenna to the customer,

and recommend the antenna’s

replacement. Check the B+ and HV to see they are at the

values specified. Make sure your instruments are accurate; be suspicious of your HV meter if sets always have low HV.

Check the antenna terminals, metal trim,

“metallized” knobs, screws, and all other exposed metal parts for AC leakage.

Check

leakage as described below.

LEAKAGE TEST

The AC leakage from any exposed metal part to

earth ground and from all exposed metal parts to any

exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers).

Leakage

current can be measured by any one of three

methods.

A commercial leakage tester, such as the

Simpson 229 or RCA

WT-S40A.

Follow the manufacturers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data

Precision 245 digital multimeter is suitable for

this job.

Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC volt-

meter. The “limit” indication is 0.75V, so analog meters must have an accurate

low-

voltage scale. The Simpson 250 and Sanwa

SH-63Trd are examples of a passive VOM that

is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

HOW TO FIND A GOOD EARTH GROUND

A cold-water pipe is guaranteed earth ground; the cover-plate retaining screw on most AC outlet boxes is also at earth ground. If the retaining screw is to be

used as your earth-ground, verify that it is at ground

by measuring the resistance between it and a

cold-

water pipe with an ohmmeter. The reading should be zero ohms. If a cold-water pipe is not accessible, connect a 60-100 watts trouble light (not a neon lamp) between the hot side of the receptacle and the

retaining screw. Try both slots, if necessary, to locate

the hot side of the line, the lamp should light at normal brilliance if the screw is at ground potential.

(See Fig.

To Exposed Metal

Parts on Set

0.15rF

Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

voltmeter

10.75 V)

-3-

Trouble Light

Ohmmeter

Cold-water Pipe

Fig. B. Checking for earth ground.

sueen

Handle

POWER

swkch

CHANNEL +/- buttons VOLUME control TV BAND selector (VHFAIHF)

EAR (earphone) jack RADIO TUNING ~~trcl CH CALL button MODE

eelector

Dial scale

aattery

comparment (bottom)

Usin on House Current II 2d

AC)

Using the supplied AC power adaptor

IEXT

Batteries

Telescopic antenna

BRT (brightness)

CONTR (contrast)

DC IN t2V (external input) jack

ANT (external antenna)

jack

Size D

(R20) x 8

mntrcl

ccntml

power

r---3,6

1 Press the POWER switch 2 Se, the MODE selector to TV.

The

unit starts tunina

Pull cut the antenna fully

Select

the band. VHF or UHF.

Tune in the desired channel.

autOmaticallY. MODE

1 5

CHC2:ALL

button

D :6

. AM

To indicate the current channel

Press the CH CALL button. The line appears et the position of the current channel

110 Listen Using the Earphone

For your safety, do not

controls while drivina.

Note

Be sure to turn off me N after use. especially when listening with earphone. This prevents unnecessary batter/ wear.

(

Picture Adjustment

warch

the N nor operate the

to DC IN 12V

Use only recommended AC power adaptor. Do not use any other AC

power adaptor.

Polarity of the plug

When to replace batteries

When the picture became.5 small, replace all the batteries wim new ones.

Battery life

I I

and

ccrrcslon.

N RAM0

1.5

AM PM

25 25

70 70

Balmtea

Sony SUM-l PW

Sony

alkaline

AM1 (N)

Note

When me unit is not to be used for a long period of time. remove the bettedes to avoid unit damage caused by

ba”ery

1eakaga

CHANNEL

I->

Adiust the antenna length and its direction

Adiust the volume.

V.HOLD control

To turn off the TV

press

me POWER

It the channel changes

If the power is momentarily lost because of a mechanical shock. or if the unit has passed through a tunnel. the channel may change. channel again

switch ad i0id me

If this happens, tune in the desired

with

CHANNEL +I-.

antenna.

Turn the control when the picture rolls vertically

BRT Mntrcl

Turn the control counterclockwise for more brightness end

clcdtwise lcr less brightness.

CONTR ccntrcl The picture mntrast counterclockwise. and is reduced by turning it ClCckWisB.

bewmes

stronger by turning the COntrCl

395

Outdoor antenna

Monitoring the video camera recorder

After connecting as illustrated, turn on the power equipment and tune in the channel 3 or 4.

the

1 6

1 Press the POWER switch. 2 Set the MODE selector to FM or AM.

Pull

ail

the antenna fully

Tune in the desired station

For FM reception. adjust the length and direction of ti?&

Ct”W”M.

For AM reception, rotate the unit.

6 Adjust the volume.

ior

FM reception

MODE

RADIO TUNING

VHF antenna

75ohm maxtal

cable

F-type

COtl”RCtO,

CM)

Antenna cable EAC-110

(no,

Slpplii)

VOLUME

al’

To turn off the radto

Press the POWER switch and told the antenna.

To listen using the earphone

See ‘Watching the TV”.

Note

Se sure to turn oft the radio after listening with earphone. This prevents unnecessary battery wear.

we,

especially when

SECTION 2

DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

2-1. CABINET (REAR)

cabinet (rear)

battery case lid

2-3. CATHODE-RAY TUBE

2-4.

~BvTP3XlO

R BOARD

PTP3XB

C board

CRT retainer spring

2-2. A BOARD

board

2-5. POINTER SETTING

4) Set the pointer bracket.

pointer to the ditch of left edge.

power button

-6.

Turn

fully

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+ 14 hidden pages