Sony Walkman WM-EX660 Bedienungsanleitung

MICROFILM

SERVICE MANUAL

CASSETTE PLAYER

AEP Model

UK Model

WM-EX660/EX662

E Model

WM-EX662

Model Name Using Similar Mechanism WM-EX650/EX652/EX654

Tape Transport Mechanism Type MT-WMEX550-125

SPECIFICATIONS

WM-EX660/EX662

Dolby noise reduction manufactured under license

from Dolby Laboratories Licensing Corporation.

“DOLBY” and the double-D symbol aare trade-

marks of Dolby Laboratories Licensing Corporation.

– 2 –

TABLE OF CONTENTS

1. SERVICING NOTES............................................... 3

2. GENERAL ................................................................... 5

3. DISASSEMBLY ......................................................... 8

4. MECHANICAL ADJUSTMENTS....................... 13

5. ELECTRICAL ADJUSTMENTS......................... 13

6. DIAGRAMS

6-1. Block Diagram ................................................................ 14

6-2. Printed Wiring Board ...................................................... 16

6-3. Schematic Diagram ......................................................... 19

6-4. IC Pin Function Description ........................................... 25

7. EXPLODED VIEWS................................................ 27

8. ELECTRICAL PARTS LIST ............................... 30

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270 ˚C dur-

ing 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 dam-

aged by heat.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK !OR DOTTED

LINE WITH MARK !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 IN THIS MANUAL OR IN SUPPLEMENTS PUB-

LISHED BY SONY.

– 3 –

SECTION 1

SERVICING NOTES

oscillator

square wave

10 Hz, – 3.5 dB

S702

IC701

S705 (PLAY)

S704 (STOP)

TP23

(GND)

FWD

→

REV

S706 (FF)

S707 (REW)

RV601

connect to

M901 (motor)

battery terminal

PH701

TP35

PHOTO

battery terminal

ATS terminals

(to S901)

connect to

PM901 (plunger)

S701

CASSETTE

HOLDER

–

1. Setting

1) Refer to “3. DISASSEMBLY”, and remove the cabinet and

open the MAIN board.

2) Connect the MAIN board to the M901 (motor) and PM901

(plunger) using jumper wires.

3) Short the ATS terminals.

4) Press and fixed the S701 (CASSETTE HOLDER).

5) Supply 1.5V to the battery terminals ‘and ’using a stabi-

lized power supply.

2. FF, REW Modes

1) Input a square wave to the TP35 (PHOTO IN) and TP23

(GND). (See figure below)

2) Press the S704 (STOP) for selecting STOP mode.

3) Press the S706 (FF) or S707 (REW).

3. PLAY mode

1) Input a square wave to the TP35 (PHOTO IN) and TP23

(GND). (See figure below)

2) Press the S704 (STOP) for selecting STOP mode.

3) Press the S705 (PLAY). (Each time the switch is pressed, the

mode is changed over.)

This set detects the rotation of GEAR (PH) using the PH701 (photo

reflector). The PH701 is mounted on the MAIN board, and there-

fore the GEAR cannot be detected with the MAIN board removed.

As a result, the motor cannot be controlled, causing malfunction.

Further, the S702 (FWD/REV switch) is also mounted on the MAIN

board, and with the board removed, the mechanism position

cannnot be detected and the operation is not changed over.

Therefore, when the voltage check is executed with the MAIN

board removed, follow the procedure provided below.

Note : Do not move the S702 swithc position when removing the MAIN

board.

If it is moved, the set will not be changed over to the selected mode.

In this case, reconnect the MAIN board to the set and retry the

work from the beginning.

— MAIN BOARD (SIDE B) —

– 4 –

Lever (SW) Rotation system

Rotation system during PLAY.

Rotation system during FF. Rotation system during REW.

senter

lever (SW)

side R side F

Pulley (reverse)flywheel (R) ass’y

flywheel (N) ass’y

gear (Y)

gear (TA)

gear (TB) gear (S) motor pulle

gear (REEL)

(S side)

gear (NR)

(REV: right side/

FWD: left side)

gear (REEL)

(T side)

clutch ass’y (M)

gear (TB)

gear (REEL)

(T side)

gear (Y)

gear (NR) motor pulley

pulley (reverse)

clutch ass’y (M)

flywheel (R) ass’y

flywheel (N) ass’y

gear (FR)

(FF: left side)

gear (NR)

gear (Y)

gear (S)

flywheel (N) ass’y flywheel (R) ass’y pulley (reverse)

clutch ass’y (M)

motor pulley

gear (REEL)

(S side)

gear (FR)

(REW: right side)

– 5 –

SECTION 2

GENERAL This section is extracted from

instruction manual.

– 6 –

– 7 –

– 8 –

SECTION 3

DISASSEMBLY

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

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

CASSETTE LID ASS’Y

Remove the cassette lid ass’y to

direction of the arrow

screw (1.4

screw (IB lock)

Open the cassette lid ass’y.

CASSETTE

LID ASS’Y

SET

CASE (N) ASS’Y REEL ORNAMENT MAIN BOARD

NOTE FOR INSTALLATON

BELT

MOTOR (M901)

MAGNETIC HEAD (HP901)

– 9 –

CASE (N) ASS’Y

REEL ORNAMENT

case (N) ass’y

serrat IB locks

two serrat IB locks

two claws

Remove the reel ornament to

direction of the arrow

Push to the direction of the arrow

remove the claw of knob (OPEN).

four claws

– 10 –

MAIN BOARD

NOTE FOR INSTALLATION

•MAIN BOARD

On installation MAIN board adjust

the S702 and lever (SW)

Remove five solders of

motor (M901) and battery terminal

board ass’y.

screw

(IB lock)

main board

flexible boar

(CN301)

serrat IB lock

5

screw

2

screw

3

battery terminal

board ass’y

Remove two solders of

plunger solenoid.

lever (SW)

S702

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