Sony WALKMAN WM-FX483 Bedienungsanleitung

WM-FX483/FX485/FX487

US Model

WM-FX487

Canadian Model

WM-FX485/FX487

AEP Model

E Model

WM-FX483/FX485/FX487

SERVICE MANUAL

RADIO CASSETTE PLAYER

MICROFILM

Model Name Using Similar Mechanism WM-EX402/EX404/EX405/EX406

Tape Transport Mechanism Type MF-WMFX483-147

SPECIFICATIONS

Manufactured under license from Dolby

Laboratories Licensing Corporation.

“DOLBY” and the double-D symbol aare

trademarks of Dolby Laboratories Licensing

Corporation.

Design and specifications are subject to change without notice.

Photo : WM-FX485

Ver 1.0 1998.03

— 2 —

TABLE OF CONTENTS

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron aroud 270˚ C during

repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering

or unsoldering.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

1. GENERAL ······································································ 3

2. DISASSEMBLY

2-1. Cabinet (Front) Assy ·························································· 5

2-2. Main Board········································································· 6

2-3. Mechanism Deck ································································ 6

2-4. Cassette Lid SubAssy ························································ 7

2-5. Display Board····································································· 7

3. MECHANICAL ADJUSTMENT······························· 8

4. ELECTRICAL ADJUSTMENT ································ 8

5. DIAGRAMS

IC Block Diagrams··························································· 11

5-1. Block Diagram ································································· 13

5-2. Printed Wiring Board -Main Section- ······························ 15

5-3. Schematic Diagram -Main Section- ································· 17

5-4.

Printed Wiring Board -Display Section-(FX483/FX485

)··19

5-5. Schematic Diagram

-Display Section-(FX483/FX485

) ···· 21

5-6.

Printed Wiring Board -Display Section-(FX487

) ·············· 23

5-7. Schematic Diagram

-Display Section-(FX487

) ················ 25

5-8. IC Pin Function ································································ 27

6. EXPLODED VIEWS

6-1. Cassette Lid Section ························································· 29

6-2. Cabinet Section································································· 31

6-3. Mechanism Deck Section················································· 32

7. ELECTRICAL PARTS LIST ··································· 33

SECTION 1

GENERAL

— 3 —

— 4 —

— 5 —

SECTION 2

DISASSEMBLY

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

2-1. CABINET (REAR) ASSY

•This set can be disassembled in the order shown below.

2-1. CABINET (REAR) ASSY 2-2. MAIN BOARD

2-4. CASSETTE LID SUB ASSY

2-3. MECHANISM DECK

2-5. DISPLAY BOARD

Screw (B 1.7

12), tapping

Open the lid battery case.

Cabinet (rear) assy

Claws

— 6 —

2-2. MAIN BOARD

2-3. MECHANISM DECK

• Use caution when installing the cassette holder assy

Install the cassette holder with the spring (lid up) as shown

below in the drawing so that it fits into the holes on the

cabinet front assy. Once installed, fit the left and right pieces

on.

PC board, flexible

Cabinet (front) assy

HEAD flexible board

Screw (1.7

2.5), tapping

MAIN board

Mechanism deck

Cabinet (front) assy

— 7 —

2-5. DISPLAY BOARD

2-4. CASSETTE LID SUB ASSY

•Press on the left & right clips from the

rear of the Cabinet (front) assy, and

remove the boss.

Cassette lid sub assy

Cabinet (front) assy

Spring (lid up) Cassette lid sub assy

Cabinet (front) ass

Screws

DISPLAY board

Holder

Cassette lid

— 8 —

SECTION 3

MECHANICAL ADJUSTMENT SECTION 4

ELECTRICAL ADJUSTMENT

PRECAUTION

1. Clean the following parts with a denatured-alcahol-moistened

sweb :

Playback head Pinch roller

Rubber belt Capstan

2. Demagnetize the playback head using a demagnetizer.

3. Do not use a magnetized screwdriver for adjustments.

4. After adjusting, apply screw-locking compound onto the

adjusted parts.

5. Unless specified otherwise, use a specified voltage (3.0V) to

perform the adjustments.

Torque Measurement

Mode

FWD

Back Tension

REV

Back Tension

REW

Torque meter

CQ-102C

CQ-102RC

CQ-201B

Meter reading

20 - 42 g · cm

(0.28-0.58 oz · inch)

Less than 2 g · cm

(Less than 0.03 oz · inch)

20 - 42 g · cm

(0.28-0.58 oz · inch)

Less than 2 g · cm

(Less than 0.03 oz · inch)

More than 50 g · cm

(More than 0.69 oz · inch)

PRECAUTION

1. Specified voltage : 3.0V

2. Switch and control position

MENU switch

MENU → TAPE → SET : NORM

MENU → SOUND → SET : No message

MENU → AVLS → SET : No message

MENU → aNR → SET : OFF (FX485/FX487)

VOL control : maximum

CASSETTE SECTION

Test Tape

Tape Speed Adjustmnet

Procedure :

1. Playback WS-48A (Tape center part) and adjust RV601 so that

the frequency counter reading becomes 2,985Hz to 3,015Hz.

2. PlaybackWS-48A (Tape top and end).

Check that frequency counter reading is within 1.5% of the

reading of step1.

Adjustment Point :

Type

WS-48A Signal

3kHz, 0dB Purpose

Tape Speed Adjustment

Test tape

WS-48A

(3kHz, 0dB)

Set

Ω

PHONES jack

–

Frequency counte

RV601

— 9 —

TUNER SECTION

[AM]

Setting :

RADIO ON/BAND switch : ON/AM

AM Tuning Voltage Adjustment

( ) : Except US, Canadian models

AM IF Adjustment, AMTracking Adjustment

• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally

done by the trimmer capacitors.

( ) : Except US, Canadian models

[FM]

Setting :

RADIO ON/BAND switch : ON/FM

FMTuning Voltage Adjustment

FMTracking Adjustment

[ ] : East European model

AMTRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L4 620kHz (621kHz)

CT2 1,400kHz (1,395kHz)

Set

PHONES

–

FM RF signal

generator

75kHz frequency

deviation by 1KHz signal.

Output level : as low as possible.

0.01

Fto IC1 pin

Level meter

(AC : 0.5 – 5V range)

Ω

AM RF signal

generator

30% amplitude modulation

by 400Hz signal.

Output level : as low as possible

Put the lead-wire antenna

close to the set.

Set

jack

Ω

–

Level meter

(AC : 0.5 – 5V range

)

–

digital voltmete

(VT)

(GND)

MAIN board

AMTUNINGVOLTAGE ADJUSTMENT

Adjust for a 1.5 ± 0.03Vde reading on digital voltmeter.

L3 530kHz

(531kHz)

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

1,000 (999) kHz

–

digital voltmete

(VT)

(GND)

MAIN board

FMTUNING VOLTAGE ADJUSTMENT

Adjust for a 10.0 ± 0.03Vde reading on digital voltmeter.

L2 108MHz

FMTRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

L1 87.5MHz

[65.0MHz]

CT1 108MHz

— 10 —

FM TRACKING ADJUSTMENT

CT1 L1

AM TRACKING ADJUSTMENT

L4 (FERRITE BAR ANTENNA)

AM TRACKING ADJUSTMEN

AM TUNING VOLTAGE ADJUSTMENT

FM TUNING VOLTAGE

ADJUSTMENT

AM IF ADJUSTMENT

CT2

[MAIN BOARD] — SIDEA —

[MAIN BOARD] — SIDE B —

J301

C606

C701

C306 1

C34

CT1

CT2

R18R21

S601

CONTROL

RVS

REW

FWD

FX483

MODEL

FX483

MODEL

FX485/

FX487

MODELS

EXCEPT

US,CND,C&SA

FX485/

FX487

MODELS

C36

C105

C205

C37

S701

HOLD

OFF

RV301

VOL

R19

R20

C17

C16

TP(VT)

(VT)

TP(GND)

(GND)

TP(ANT)

(ANT)

FL1

GND VCC

DATAREMO

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