Sony WM-EX190 - Walkman Cassette Player Bedienungsanleitung

WM-EX190/EX192

US Model

Canadian Model

WM-EX190

AEP Model

E Model

Chinese Model

WM-EX190/192

SERVICE MANUAL

CASSETTE PLAYER

MICROFILM

SPECIFICATIONS

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MT-WMEX192-114

•Power requirements

3V DC batteries R6 (AA) ×2

•Dimensions

82 ×111.5 ×34.5 mm

(w / h/ d) incl. projecting parts and controls

•Mass

Approx. 115 g / Approx. 190 g incl.

batteries and a cassette

•Supplied accessories

Stereo headphones or Stereo earphones (1) / Belt clip (1)

Design and specifications are subject to change without notice.

Photo :WM-EX192

Ver 1.0 2000.01

— 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.

SECTION 1

GENERAL

1. GENERAL ······································································ 2

2. DISASSEMBLY

2-1. Cabinet (REAR) ································································· 3

2-2. Main Board········································································· 4

2-3. Lid, Cassette ······································································· 4

2-4. Mechanism Deck ································································ 5

2-5. “BELT” “MOTOR” “PINCH LEVER” “HEAD,

MAGNETIC” ····································································· 5

3. MECHANICAL ADJUSTMENT ······························ 6

4. ELECTRICAL ADJUSTMENT ································ 6

5. DIAGRAMS

5-1. Block Diagram ··································································· 7

5-2. Printed Wiring Board·························································· 9

5-3. Schematic Diagram ·························································· 11

5-4. IC Block Diagram ···························································· 13

6. EXPLODEDVIEWS

6-1. Cabinet Section································································· 14

6-2. Main Board Section·························································· 15

6-3. Mechanism Section-1 ······················································· 16

6-4. Mechanism Section-2 ······················································· 17

7. ELECTRICAL PARTS LIST ··································· 18

This section is extracted

from instruction manual.

— 3 —

SECTION 2

DISASSEMBLY

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

2-1. CABINET (REAR)

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

Cabinet (rear)Set Main board

Lid assy, cassette

Mechanism deck Belt

Motor

Pinch lever (N) assy

Head, magnetic

Two screws (B1.7

)

Open the lid, cassette

Cabinet (rear)

(There 16 claws of

are caught.)

— 4 —

2-2. MAIN BOARD

2-3. LID ASSY, CASSETTE

Remove the solders.

Screw (M1.4

)

Claw

MAIN board

(There is a claw.)



Spring (torsion)

Lid assy, cassette

Open the lid, cassette

Release the catc

Release

the catch

— 5 —

2-4. MECHANISM DECK

2-5. BELT, MOTOR, PINCH LEVER (N) ASSY,“HEAD, MAGNETIC”

Remove the mechanism dec

in the direction of the arrow.

(There two claws.)

Two claws

Two screws (M1.4)

Motor (reel/capstan)

Head,magnetic (playback)

Pnch lever (N) assy

Belt

Motor (reel/capstan)

Wheel assy (sp), capstan

Belt threading

Belt

— 6 —

SECTION 3

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. The adjustments should be performed with the rated power

supply voltage (3.0 V) unless otherwise noted.

Torque Measurement

SECTION 4

ELECTRICAL ADJUSTMENT

PRECAUTION

• Supplied voltage : 3.0V

• Switch position

AVLS switch : NORM

MEGA BASS switch : OFF/NORM

Test tape

Tape Speed Adjustment

Procedure :

1. PlaybackWS-48A (tape centerpart) in the REV state andadjust

RV601 so that the frequency counter reading becomes

3,000 Hz.

Specification Value :

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

Check thatfrequencycounterreading is within 1.5% ofreading

of step 1.

Adjustment Location :

Digital frequency counter

2,985 to 3,015 Hz

Type

WS-48A Signal

3 kHz, 0 dB Used for

tape speed adjustment

Mode Torque Meter Meter Reading

20 – 30 g • cm

FWD CQ-102C (0.28 – 0.42 oz • inch)

FWD less than 2 g • cm

back tension (less than 0.03 oz • inch)

more than 40 g • cm

FF, REW CQ-201B (more than 0.56 oz • inch)

test tape

WS-48A

(3 kHz, 0 dB)

set

jack (J301)

Ω

frequency counter

RV601:

Tape speed adjustment

[MAIN BOARD]

WM-EX190/EX192

SECTION 5

DIAGRAMS

5-1. BLOCK DIAGRAM

— 7 — — 8 —

MVREF

L10 5 30

28 24 22

RV301

VOLUME

R12 7 29

27 25 23 20

LOW

BOOST

V REF

322613

MEGA BASS

GROOVE NORM

MEGA BASS OFF

(EX192)

(EX190)

S503

S305-1

S305-2

NORM LIMIT

18V REF

FWD/REV

OSC

B+

HP901

PLAYBACK HEAD

IN+

TH601

RV601

TAPE

SPEED

OPERATION

DET

CURRENT

DET

PULSE

DET

OPERATION

LOGIC

PRE

DRIVE

2 44 45 46

M901

REEL/CAPSTAN

MOTOR

J301

POWER MUTE

19VCC

3S/S

Q301

10K/47K

TAPE

POWER

S301

BATTERY

DRY

3.0V

D150

(POWER) +B+

AVLS

• Signal path.

E: PB

WM-EX190/EX192

— 9 — — 10 —

5-2. PRINTEDWIRING BOARD

Note on Printed Wiring Board:

•X: parts extracted from the component side.

•b: Pattern from the side which enables seeing.

C344

TP14

RV601

R610

R611

R608

JR18

TP3

JR37

JR35

JR29

JR7

JR28

JR12

JR10

JR14

JR11

JR32

JR26

JR24JR25

JR22

C319

C327

C338

C341

C324

C101

C332

C336

C334

C109

C209

R324

TP4

TP13

TP12

JR27

JR36

JR31

JR30

JR33 JR34

JR17

EX192

MODEL

EX190

MODEL

JR16

JR19

JR20

JR3

JR23

JR1

JR21

R207

R107

JR8

JR4

JR2

R209

R109

JR9

JR15

Q301

D150

C337

IC301

C605

C606

R606

TP1

TP9

TP15

TP10 TP11

TP2

TH601

C335

R327

D302

C342

C321

C333

C325

C105

C205

R103

R205

C203

C107

C108

C208

R203

R204

R150 R206

R106

R105

R609 C608

C603

C602

C601

R601

JR13

JR38

JR5

JR6

C201

C604

R605

C103

R104

R108

R208

R110

R210

C207

TP5

TP7

TP8

TP6

13 24

3748

HP901

PLAYBACK HEAD

M901

REEL/CAPSTAN

MOTOR

DRY BATTERY

SIZE "AA"

(IEC DESIGNATION R6)

2PCS, 3V COM

J301

MAIN BOARD

C204

C104

S305

AVLS

RV301

VOLUME

NORM

LIMIT

(POWER)

S301

(TAPE POWER)

S303

OFF : EX190MEGA BASS

NORM : EX192MEGA BASSGROOVE

(11)

REF

GND

1-675-493

C609

C343

R325

EX192 MODEL

345678910

Ref. No. Location

D150 F-3

D302 B-2

IC301 D-4

Q301 E-4

• Semiconductor

Location

WM-EX190/EX192

5-3. SCHEMATIC DIAGRAM

— 11 — — 12 —

Note on Schematic Diagram:

• All capacitors are in µF unless otherwise noted. pF: µµF

50 WV or less are not indicated except for electrolytics

and tantalums.

• All resistors are in Ωand 1/4W or less unless otherwise

specified.

• % : indicates tolerance.

•C: panel designation.

•U: B+ Line.

•H: adjustment for repair.

• Total current is measured with no cassette installed.

• Power voltage is dc V and fed with regulated dc power

supply from external power voltage jack.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

no mark : STOP

( ) :PLAY

• Voltages aretakenwithaVOM(Input impedance 10 MΩ).

Voltage variations may be noted due to normal produc-

tion tolerances.

• Signal path.

E: PB

• Abbreviation

CND : Canadian model

FR : French model

EA : Saudi Arabia model

• Refer to page 13 for IC Block Diagram.

EX190 : E/

EX192 : AEP, E, EA

2.2M

C609

1000p

C343

1000p

R106, R206

150 : EX192: FR

100 : EXCEPT EX192: FR

R104, R204

680 : EX192: FR

470 : EXCEPT EX192: FR

WM-EX190/EX192

NOTE:

• -XX, -X mean standardized parts, so they may

have some differences from the original one.

• Items marked “*” are not stocked since they

are seldom required for routine service. Some

delayshouldbeanticipatedwhenorderingthese

items.

SECTION 6

EXPLODEDVIEWS

• The mechanical parts with no reference number

in the exploded viewsare not supplied.

• Abbreviation

CND : Canadian model

FR : French model

EA : SaudiArabia model

• Color Indication of Appearance Parts

Example:

KNOB, BALANCE (WHITE) . . . (RED)

↑ ↑

Parts of Color Cabinet’s Color

IC301 LB8115W-TLM

5-4. IC BLOCK DIAGRAM

— 13 — — 14 —

236

13 14 15 16 17 18 19 20 21 22 23 24

48 47 46 45 44 43 42 41 40 39 38 37

COM

VREF

POWER OUTC

POWER OUT2

VCC

POWER MUTE

POWER IN1

POWER IN2

MIX OUT1

MIX OUT2

LP.2

R. P2

R.P1

DET OUT

MVREF

IN+

VSP

LOW BOOST IN2

LOW BOOST IN1

LOW BOOST SW

M-GND

R.VREF

PRE MUTE SW

(FWD/REW)

POWER OUT1

POWER GND

MVCC

WOUT

MP-GND

VOUT

UOUT

OUT

OSC

PRE NF1

PRE OUT2

PRE NF2

PRE FWD IN2

PRE REV IN2

PRE REV IN1

PRE FWD IN1

S/S

PRE GND

PRE OUT1

BIAS

R.F

REF SYS

CONT

DET

VREF

SPEED

LOW

BOOST

PRE DRIVER

OPERATION LOGIC

OSC

PLUSE DET

REF

VOLTAGE

REF VOLTAGE

FOR SPEED CONTROL

CURRENT

DET

OPERATION

DET

FWD/

REV

FREQ

CARC.

–

mechanism

not supplied

6-1. CABINET SECTION

Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks

1 X-3378-625-1 LID ASSY, CASSETTE (GRAY)(EX190)

1 X-3378-626-1 LID ASSY, CASSETTE (BLUE)(EX190)

1 X-3378-627-1 LID ASSY, CASSETTE (GREEN)(EX190)

1 3-040-914-01 LID,CASSETTE (GOLD)(EX192)

1 3-040-914-11 LID,CASSETTE (BLACK)(EX192)

1 3-040-914-21 LID,CASSETTE (BLUE)(EX192)

2 3-019-949-01 SPRING (TORSION)

3 3-041-234-01 SPRING (CASSETTE)

4 3-040-908-01 CABINET (FRONT)(EX190)

4 3-040-908-11 CABINET (FRONT)(EX192)

5 3-040-911-01 KNOB(MEGA BASS) (EX190)

5 3-040-915-01 KNOB(GROOVE) (EX192)

6 3-040-909-01 CABINET (REAR)

7 3-040-910-01 LID,BATTERY CASE

8 3-022-346-01 LENS

9 3-318-203-92 SCREW(B1.7X9), TAPPING

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