Sony Walkman WM-EX372 Bedienungsanleitung

MICROFILM

SERVICE MANUAL

CASSETTE PLAYER

AEP Model

E Model

TC-K6/K7

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MT-WMEX372-114

SPECIFICATIONS

WM-EX372

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.

Ver 1.2 1999.03

With SUPPLEMENT 1

(9-923-319-81)

With SUPPLEMENT 2

(9-923-319-82)

– 2 –

TABLE OF CONTENTS

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

2. DISASSEMBLY ......................................................... 4

3. MECHANICAL ADJUSTMENTS....................... 8

4. ELECTRICAL ADJUSTMENTS......................... 8

5. DIAGRAMS

5-1. Block Diagram ................................................................ 9

5-2. Printed Wiring Board ...................................................... 11

5-3. Schematic Diagram ......................................................... 13

6. EXPLODED VIEWS................................................ 16

7. ELECTRICAL PARTS LIST ............................... 19

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.

– 3 –

SECTION 1

GENERAL This section is extracted from

instruction manual.

– 4 –

Insert the precision screw driver (1.4 mm flat-blade) in to the slit at claw

and release the claw.

Remove the cabinet (rear) ass’y.(Release all claw

in alphabetical order.)

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

SECTION 2

DISASSEMBLY

CABINET (REAR) ASS’Y

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

CABINET (REAR) ASS’Y MECHANISM DECK

(MT-WMEX372-114) BELT

MAGNETIC HEAD

(HP901)

MOTO

(M901)

MEGA BASS UNIT (DOLBY)

MAIN BOARD

CASSETTE HOLDER ASS’Y

SET

screw (B1.7

cassette holder

cabinet (rear) ass’

– 5 –

MAIN BOARD, MECHANISM DECK (MT-WMEX372-114)

BELT, MOTOR (M901), MAGNETIC HEAD (HP901)

main board

head flexible board

(CN301)

Remove the mechanism

deck (MT-WMEX372-114)

to direction of the arrow.

claw

two claws

Remove four solders of

motor lead (M901).

toothed lock (WH) scre

(M1.4)

flexible board (CN302)

belt

motor (M901)

two special head screw

(M1.4)

two screws

magnetic head

(HP901)

– 6 –

CASSETTE HOLDER ASS’Y

NOTE FOR INSTALLATION

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

•SPRING (TORSION)

flexible board

(CN302)

portion

to release

the hinge plate.

spring (torsion)

cassette holder ass’y

Insert a precision screwdriver (1.4 mm flat-blade)

vertically in to portion

to release the hinge plate.

cassette holder ass’y

Attach the spring (torsion) as

shown in the figure.

Insert the spring (torsion) in the

ditch to direction of the arrow

– 7 –

MEGA BASS UNIT (DOLBY)

mega bass unit (dolby)

two knobs (rotary)

flexible board

claw

Remove five claws as

move the mega bass

unit (dolby) to direction

of the arrow

three claws

claw claw

– 8 –

Meter reading

more than 30 g

(more than 0.41 oz)

Torque meter

CQ-403A

CQ-403R

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)

Torque meter

CQ-102C

CQ-102RC

CQ-201B

3-1. MECHANICAL ADJUSTMENTS

Precaution

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

swab:playback head pinch roller

capstan rubber belt

2. Demagnetize the playback head with a head demagnetizer.

3. Do not use a magnetized screwdriver for the adjustments.

4. After the adjustments, apply suitable locking compound to the

parts adjusted.

5. The adjustments should be performed with the rated power

supply voltage (2.5 V) unless otherwise noted.

Torque Measurement

SECTION 3

MECHANICAL ADJUSTMENTS

Tape Pulling Force Measurement

SECTION 4

ELECTRICAL ADJUSTMENTS

Precaution

•Supplied voltage: 2.5 V

•Switch and control position

NORM CrO2/METAL switch: NORM

VOLUME CONTROL: maximum

TONE CONTROL HIGH and LOW: mechanical center

AVLS switch: NORM

MEGA BASS switch: OFF

DOLBY NR switch: OFF

Test tape

0 dB = 0.775 V

Tape Speed Adjustment

Procedure:

Type Signal Used for

WS-48A 3 kHz, 0 dB Tape Speed Adjustment

–

frequency counter

set

jack

Ω

test tape

WS-48A

(3 kHz, 0 dB)

1. Playback WS-48A (tape end part) in the REV mode and adjust

RV601 so that the frequency counter reading becomes 2,980

Hz ± 1%.

2. Playback WS-48A (tape top part) in the FWD mode and check

that the frequency counter reading becomes 2,980 ± 45 Hz.

3. PlaybackWS-48A (tape end part) in the FWD mode and check

that the frequency counter reading recomes 2,980 ± 45 Hz.

4. Playback WS-48A (tape top part) in the REV mode and check

that the frequency counter reading becomes 2,980 ± 45 Hz.

Adjustment Location:

RV601 label (model)

Mode

FWD

Back Tension

REV

Back Tension

FF, REW

Mode

FWD

REV

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