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Sony Walkman WM-EX20 Service Manual
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Sony Walkman WM-EX20 Service Manual

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Download this manual See also: Operating Instructions
SERVICE MANUAL
Ver 1.0 1999. 08
Manufactured under license from Dolby Laboratories
Licensing Corporation.
"DOLBY" and the double-D symbol a are trademarks
of Dolby Laboratories Licensing Corporation.
Tape section
Frequency response
(Dolby NR off)
Output
General
Power requirements
Dimensions (w/h/d)
Mass
MICROFILM
SPECIFICATIONS
Playback: 30 – 18,000 Hz
Headphones (REMOTE 2 jack)
Load impedance 8 – 300 Ω
1.5 V
One rechargeable battery or
one R6 (size AA) battery
Approx. 78.7 × 108.6 × 18.7 mm
× 4
×
(3
1
/
3
/
3
/
inches), incl.
8
8
4
projecting parts and controls
Approx. 180 g (6.4 oz)
Approx. 240 g (8.5 oz) (incl.
rechargeable battery and a cassette)
WM-EX20
Australian Model
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
Supplied accessories
Battery case (1)
Stereo earphones with remote control (1)
Battery charger (1)
US, CND model : BC-7DC
AEP, FR model : BC-7DY
E, JE model : BC-7HT
UK model : BC-7S
AUS model : BC-7SG
KR model : BC-9HR
Rechargeable battery (1)
US, CND, AEP, UK, FR, AUS model :
NC-6WM, 1.2V, 600mAh, Ni-Cd
KR, E, JE model:
NH-14WM, 1.2V, 1400mAh, Ni-MH
Rechargeable battery carrying case (1)
Carrying pouch (1)
E, JE, model:
AC plug adaptor (1)
Design and specifications are subject to change without notice
• Abbreviation
CND : Canadian model
FR
: French model
AUS : Australian model
KR
: Korea model
JE
: Tourist model
CASSETTE PLAYER
US Model
Canadian Model
AEP Model
UK Model
E Model
Tourist Model
NEW
MT-WMEX20-162

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Summary of Contents for Sony Walkman WM-EX20

  • Page 1 WM-EX20 SERVICE MANUAL US Model Canadian Model Ver 1.0 1999. 08 AEP Model UK Model E Model Australian Model Tourist Model Manufactured under license from Dolby Laboratories Model Name Using Similar Mechanism Licensing Corporation. Tape Transport Mechanism Type MT-WMEX20-162 “DOLBY” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.

  • Page 2: Table Of Contents

    CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU PUBLISHED BY SONY.

  • Page 3: Service Note

    Rotation of the idler gear (A) (S side) is detected using the photo- can be entered. reflector (PH702) in the WM-EX20. PH702 is located on the MAIN Make sure that the slider (F/R) is in the center position and that board, therefore the rotation of the idler gear (A) (S side) cannot be the F/R switch (S702) is in the center position.
  • Page 4 [ Slider (NR) ] slider (NR) F side flywheel center R side F side [ Rotational system ] 1. Rotational System of PLAY Mode 2. Rotational System of FF Mode idler gear (A) (S side) gear (reel) (T side) gear (reel) (T side) gear (reel) (S side) idler gear (A) (T side) idler gear (A) (T side)

  • Page 5: Disassembly

    SECTION 3 DISASSEMBLY • The equipment can be removed using the following procedure. Ornament (OPEN) "Sub Board", "Switch, Leaf", Lid Assy, Cassette Belt (F1), Motor (M601) Case Block Assy "Main Board" Holder Assy Magnetic Head (HP701) Pinch Lever (N)/(R) Assy Note : Follow the disassembly procedure in the numerical order given.

  • Page 6: Ornament (Open) Block Assy

    3-3. ORNAMENT (OPEN) BLOCK ASSY 1 Release the two claws from the two holes in the direction allow Hole Hole Ornament (open) block assy Claw Claw Mechanism deck block 3-4. “SUB BOARD”, “SWITCH, LEAF”, “MAIN BOARD” 4 Unsolder the 6 places. 7 Screw (M1.4) 1 Screw qs Claw...

  • Page 7: Belt (F Kai), Motor (M601)

    3-5. BELT (F KAI), MOTOR (M601) 1 Belt (F KAI) 2 Two screws (M1.4) 4 Motor (M601) 3 Retainer (F1) motor Belt (F KAI) 3-6. HOLDER ASSY 4 Screw (M1.4) 7 Bracket (casette) assy 5 Lock lever (S) 8 Remove soldering from Head flexible board.

  • Page 8: Pinch Lever (N)/(R) Assy

    3-7. PINCH LEVER (N)/(R) ASSY Claw 2 Remove the pinch lever (N) assy in the direction of the arrow. Claw Note: Be careful of the claw 1 Remove the pinch lever (R) assy in the direction of the arrow. Note: Be careful of the claw 3-8.

  • Page 9: Mechanical Adjustment

    WM-EX20 SECTION 4 SECTION 5 SECTION 6 MECHANICAL ADJUSTMENTS ELECTRICAL ADJUSTMENT DIAGRAMS 6-1. BLOCK DIAGRAM PRECAUTION PRECAUTION Clean the following parts with a denatured-alcohol-moistened • Supplied voltage : 1.3 V HP701 swab : • Switch and control position (PLAYBACK) AUDIO AMP...

  • Page 10: Printed Wiring Board

    WM-EX20 6-2. PRINTED WIRING BOARD AEP,UK,FR MODEL MAIN DRY BATTERY SIZE "AA" S704-1 S704-2 BOARD (IEC DESIGNATION R6) TAPE IN SUB BOARD SUB BOARD 1PCS, 1.5V SWITCH SWITCH (SIDE B) (SIDE A) (SIDE B) J301 REMOTE DC IN 1.5V BATTERY...

  • Page 11: Schematic Diagram (1/2)

    WM-EX20 6-3. SCHEMATIC DIAGRAM MAIN (1/2) SECTION • Refer to page 21, 22 for IC Block Diagrams. • Waveform IC601 456 Q605 135 150 Hz 0.5V/div 150 Hz 0.5V/div 2µsec/div 5µsec/div IC601 0 Q605 80!™ 444 Hz 0.5V/div 150 Hz 0.5V/div...

  • Page 12: Schematic Diagra (2/2)

    WM-EX20 6-4. SCHEMATIC DIAGRAM MAIN (2/2) SECTION • Refer to page 21, 22 for IC Block Diagrams. • Refer to page 23, 24 for IC Pin Function Description. • Waveform IC701 3 100 kHz 1V/div S702 5µsec/div IC702 8 4 MHz 1V/div 0.2µsec/div...

  • Page 13: Ic Block Diagrams

    6-5. IC BLOCK DIAGRAMS IC301 TA2123AF IC601 LB1994M 36 35 32 31 28 27 26 M CENTER – BUFFER COMPARATOR CAMP SW RF IN MT TC PW GND – BEEP BEEP PW OUT R BUFFER AMS OUT PW OUT C P-SIG COMPARATOR D/DT...

  • Page 14: Ic Pin Function Discription

    6-6. IC PIN FUNCTION DESCRIPTION • IC702 MB89135LPFV (SYSTEM CONTROL) Pin No. Pin Name Description Pin No. Pin Name Description AVCC – Power supply terminal. (A/D) P-SIG IN2 Motor P-SIG signal input. Reset signal input. P-SIG IN1 Motor P-SIG signal input. MODE0 Test input terminal.

  • Page 15: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • The mechanical parts with no reference number • Abbreviation have some differences from the original one. in the exploded views are not supplied. CND : Canadian model •...

  • Page 16: Mechanism Deck Block

    7-2. MECHANISM DECK BLOCK PM701 M601 HP701 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks X-3377-589-1 HOLDER (FA) ASSY 3-029-268-11 FLYWHEEL (R), INSERT X-3377-995-1 LEVER (R2) ASSY, PINCH 3-029-883-01 RETAINER (F1), MOTOR X-3377-994-1 LEVER (N2) ASSY, PINCH 3-029-273-01 GEAR(FR) 3-029-275-01 WASHER (STOPPER N) 3-010-273-02 GEAR(REEL)

  • Page 17: Electrical Parts List

    SECTION 8 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • RESISTORS • SEMICONDUCTORS parts list may be different from the parts All resistors are in ohms. In each case, u: µ, for example: specified in the diagrams or the components METAL: metal-film resistor uA...: µA...
  • Page 18 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < IC > R107 1-216-837-11 METAL CHIP 1/16W R108 1-216-789-11 METAL CHIP 1/16W IC301 8-759-579-12 IC TA2123AF(EL) R110 1-216-827-11 METAL CHIP 3.3K 1/16W IC302 8-759-597-24 IC NJM2190V(TE2) R111 1-216-839-11 METAL CHIP 1/16W...
  • Page 19 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R615 1-216-831-11 METAL CHIP 6.8K 1/16W MISCELLANEOUS R616 1-216-845-11 METAL CHIP 100K 1/16W ************* R617 1-216-851-11 METAL CHIP 330K 1/16W S704 1-762-553-11 SWITCH, LEAF (TAPE IN/ATS) R618 1-216-857-11 METAL CHIP 1/16W M601...
  • Page 20 WM-EX20 Sony Corporation 99H1689-1 Personal Audio Company 9-927-157-11 Printed in Japan ©1999.8 — 30 — Published by General Engineering Dept.

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