Sony Walkman WM-EX402 Bedienungsanleitung

– 1 –

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MF-WMFX483-147

SERVICE MANUAL

AEP Model

E Model

WM-EX402/EX404/EX405/EX406

CASSETTE PLAYER

MICROFILM

Photo : WM-EX404

Tape section

Frequency response (Dolby NR off)

Playback: 40 - 14,000 Hz

Output Headphones 2jack

Load impedance 8 - 300 ohms

General

Power requirements 3 V

Two R6 (size AA) batteries

(negative ground)

Dimensions (w/h/d) Approx. 115.5 ×83.5 ×32.5 mm

(4 5/8 ×3 3/8 ×1 5/16 inches) incl.

projecting parts and controls

Mass Approx. 135 g (4.8 oz) / Approx.

215 g (7.6 oz) incl. batteries and

a cassette

Supplied accessories Stereo headphones or Stereo

earphones with remote

control (1) (EX406 only)

Stereo headphones or Stereo

earphones (1) (EX402/EX404/

EX405 only)

Belt clip (1)

Design and specifications are subject to change without

notice.

SPECIFICATIONS

Flexible Circuit Board Repairing

•Keep the temperature of the soldering iron around 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 dam-

aged by heat.

DolbynoisereductionmanufacturedunderlicensefromDolbyLabo-

ratories Licensing Corporation.

“DOLBY” and the double-D symbol aare trademarks of Dolby

Laboratories Licensing Corporation.

– 2 –

TABLE OF CONTENTS

1. GENERAL

Getting Started ........................................................................ 4

Operating the Walkman .......................................................... 4

Additional Information ........................................................... 4

2. DISASSEMBLY

2-1. Cabinet (Rear) Assy ............................................................ 5

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

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

2-4. Cassette Lid Sub Assy ......................................................... 7

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

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

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

5. DIAGRAMS

5-1. Printed Wiring Boards ......................................................... 9

5-2. Schematic Diagram ........................................................... 11

6. EXPLODED VIEWS

6-1. Cassette Lid Section .......................................................... 16

6-2. Cabinet Section ................................................................. 17

6-3. Mechanism Deck Section.................................................. 18

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

– 3 –

SECTION 1

GENERAL This section extracted from

instruction manual.

– 4 –

– 5 –

SECTION 2

DISASSEMBLY

•The equipment can be removed using the following procedure.

Set /Cabinet (rear) assy Main board /Mechanism deck

Cassette lid sub assy /Display board

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

2-1. CABINET (REAR) ASSY

screw B 1.7x12

Open the lid battery case.

claws

cabinet (rear) assy

– 6 –

2-2. MAIN BOARD

2-3. MACHANISM DECK

serrat IB lock

flexible (MEGA BASS) board

flexible board (HEAD)

MAIN board

cabinet (front) assy

mechanism dec

cabinet (front) assy

– 7 –

spring (lid up)

cassette lid sub assy

cabinet (front) assy

2-4. CASSETTE LID SUB ASSY

2-5. DISPLAY BOARD

screws

DISPLAY board

cassette lid

•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.

•Press on the left & right clips from the rear of the

cabinet (front) assy. and remove the boss.

– 8 –

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

Mode Torque Meter Meter Reading

20 – 42 g • cm

FWD CQ-102C (0.28 – 0.58 oz • inch)

FWD less than 2 g • cm

back tension (less than 0.03 oz • inch)

20 – 42 g • cm

REV CQ-102RC (0.28 – 0.58 oz • inch)

REV less than 2 g • cm

back tension (less than 0.03 oz • inch)

more than 50 g • cm

FF, REW CQ-201B (more than 0.69 oz • inch)

SECTION 4

ELECTRICAL ADJUSTMENTS

SECTION 3

MECHANICAL ADJUSTMENTS

PRECAUTION

•Supplied voltage : 2.5 V

•Switches and control position

TAPE switch : NORM

GROOVE/MEGA BASS/

NORMAL switch : NORMAL (EX402/EX404)

SOUND switch : NORMAL (EX405/EX406)

VOL control : maximum

AVLS switch : NORM

DOLBY NR switch : OFF (Except EX402)

Test Tape

Type Signal Used for

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

Tape Speed Adjustment

Procedure :

1. Playback WS-48A (tape center part) in the REV state and

adjust RV601 so that the frequency counter reading becomes

3,000 Hz.

2. Playback WS-48A (tape center part) in the FWD state.

Check that frequency counter reading is within ±1.5% of the

reading of step 1.

Adjustment Location :

test tape

WS-48A

(3 kHz, 0 dB)

set

Ω

jack

frequency counte

RV601

– 14 –

• IC Block Diagrams

IC301 LA4585M-TLM IC302 NJM2185AV-TE2

IC601 MM1370XVBE

28 18

29 17

8 9

25 24 23 222627 21 20

R.F

REF

LOW

BOOST

SYS.

CONT

DET

MIX.2

MIX.1

6 74 5321

PWR.C

PWR.1 PWR.2

MIX IN (R)

HP IN (R)

LP1

L.B.GAIN

M.B.ON/OFF

LP2

DET1

FWD/REV

PWR IN (R)

MIX OUT (R)

MIX OUT (L)

RIPPLE

REF

FWD (L)

FWD (R)

REV (R)

REV (L)

NF (L)

NF (R)

MIX IN (L)

HP IN (L)

SW OUT (L)

SW OUT (R)

PRE OUT (L)

PRE OUT (R)

PRE GND

PRE MUTE

POWER MUTE

PWR OUT (R)

VCC

COM

PWR GND

PWR OUT (L)

AVLS

DET2

PWR IN (L)

PRE2 PRE1

14 13 12 11 10 9 8

4321 5 6 7

WEIGHT

G2 G1 V/I

BIAS

CIRCUIT

Bch BLOCK (same Ach)

VCC

ON/OFF

VEXT

INR

OUTR

DCR

DETR

GND

IREF

VREF

INL

UTL

DCL

DETL

SUM

Ach BLOCK

20 19 18 17 16 15 14 13 12

7 8 1096541 2 3

OUTPUT

BIAS

CIRCUIT

CURRENT

CONTROL VELOCITY

CONTROL

START-UP •

OSCILLATION

CIRCUIT

START-UP

CONTROL

CIRCUIT

ERROR AMP

PHASE SELECT

CIRCUIT

PRE DRIVER

START-UP

LOGIC

FORWARD/REVERSE

SELECT SWITCH

GND-2

OUT

VSP

IN+

VREF

STAR

COM

OSC

VCC

P-GND

GND-1

– 15 –

IC701 TMP47C243LM-FV81CS

4321

ACUMRATOR L REGISTER PROGRAM

COUNTER

PROGRAM

MEMORY (ROM)

DATA

CONVERSION

TABLE

COMMAND

DECODER

H REGISTER

RAM ADDRESS BUFFER DATA MEMORY (RAM)

STACK

TC1 TC2 DC

SPW

INTERRUPTION

PERMISSION

HOLD OPERATION MODE

CONTROL CIRCUIT

SYSTEM CONTROL CIRCUIT

TIMING GENERATOR

CLOCK GENERATOR

INTERRUPTION CONTROL CIRCUIT

INTERRUPTION

PERMISSION

MASTER F/F

INTERVAL

TIMER 12BIT

TIMER/

COUNTER

(2 CHANNEL)

8BIT

SERIAL

INTERFACE

WATCH DOG

TIMER ZERO

CROSS

FLAG

C Z ALUS

8BIT

A/D

CONVERTER

PULSE

OUTPUT

CIRCUIT

5 6 11

16 15

171819

20212223

242526

2728

12 13 147

8 9 10

VDD

HOLD

BEEP

PHOTO CTL

PHOTO IN

FWD/REV

REV SW

REW SW

FF SW

FWD SW

AMP CTL

VSS

MOTOR CTL

MOTOR BRK

MOTOR DIR

SPEED CTL

OPEN DET

BATT DET

KEY IN

A/D REF

MUTE

RESET

XIN

XOUT

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