Sony Walkman WM-FX488 Service Manual
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Sony Walkman WM-FX488 Service Manual

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SERVICE MANUAL
Ver 1.1 2003.01
Sony Corporation
9-874-239-02
Personal Audio Company
2003A0200-1
Published by Sony Engineering Corporation
© 2003.01
WM-FX488
Model Name Using Similar Mechanism
MD Mechanism Type

SPECIFICATIONS

• Frequency range
FM: 87.5 - 108 MHz
AM: 531 - 1602 kHz (9kHz step)
AM: 530 - 1710 kHz (10kHz step)
• Power requirement s
1.5V DC, battery AA (R6) x 1
• Dimensions (w / h/ d)
× 4
Appr ox. 83.6 x 112.0 x 28.3 mm (3
3
⁄
8
excl. projecting parts and controls
• M ass
Appr ox. 138 g (4.9 oz) (main unit only)
• Supplied accessories
Stereo headphones or Stereo earphones (1)
Carrying case with belt clip(1)
Design and specifications are subject to change without notice.
Bat t ery lif e* (approximat e hours)
Sony alkaline LR6 (SG)** Sony R6P (SR)
Tape playback
35
Radio reception
40
* Measured value by the standar d of JEITA (Japan Electr onics
and Information Technology Industries Association). (Using
a Sony HF series cassette tape)
**When using a Sony LR6(SG) "ST AMINA" alkaline dry
battery (produced in Japan).
Not e
• The battery life may be shorter depending on the operating
condition, the surrounding temperature and battery type.
Chinese Model
NEW
MF-WMFX488-114
× 1
1
⁄
1
⁄
inches)
2
8
9
14
RADIO CASSETTE PLAYER
E Model

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Summary of Contents for Sony Walkman WM-FX488

  • Page 1: Specifications

    * Measured value by the standar d of JEITA (Japan Electr onics and Information Technology Industries Association). (Using a Sony HF series cassette tape) **When using a Sony LR6(SG) “ST AMINA” alkaline dry battery (produced in Japan). Not e • The battery life may be shorter depending on the operating condition, the surrounding temperature and battery type.

  • Page 2: Table Of Contents

    WM-FX488 TABLE OF CONTENTS Flexible Circuit Board Repairing Specifications ................1 • Keep the temperature of the soldering iron around 270°C during 1. GENERAL repairing............... 2 • Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

  • Page 3: Disassembly

    WM-FX488 SECTION 2 DISASSEMBLY The equipment can be removed using the following procedure. Mechanism deck Belt, Capstan/reel motor (M601) Cabinet (center) Main board Magnetic head (playback) (HP601) Cabinet (front) Holder, Cassette Note : Follow the disassembly procedure in the numerical order given.

  • Page 4: Mechanism Deck

    WM-FX488 2-3. MECHANISM DECK Mechanism deck 1 Claws Cabinet (center) 2-4. BELT,CAPSTAN/REEL MOTOR (M601), MAGNETIC HEAD (PLAYBACK) (HP601) 2 Two screws (M1.4) 4 Two screws (M1.4) 3 Capstan/reel motor Mechanism deck (M601) • How to apply the belt Capstan/reel motor...

  • Page 5: Holder, Cassette

    WM-FX488 2-5. “HOLDER, CASSETTE’’ 2 Move the hinge away from projection Projection Hinge 3 Move the hinge away from projection Hinge Projection 4 Spring (torsion) Hinge Hinge Holder, Cassete CAUTIONS DURING ASSEMBLY Insert the spring (torsion) to the slot as shown in the figure.

  • Page 6: Adjustments

    WM-FX488 SECTION 3 ADJUSTMENTS 3-1. MECHANICAL ADJUSTMENTS 3-2. ELECTRICAL ADJUSTMENTS PRECAUTION PRECAUTION 1. Clean the following parts with a denatured-alcohol-moistened • Supplied voltage : 1.3V. swab : • Switch and control position (MENU display) playback head pinch roller MEGA BASS : OFF...
  • Page 7 WM-FX488 Ver 1.1 2003.01 • Repeat the procedures in each adjustment several times, and the TUNER SECTION 0 dB = 1µV frequency coverage and tracking adjustments should be finally AM Section done by the trimmer capacitors. BAND : AM ) : 10kHz step...
  • Page 8 WM-FX488 Adjustment Location : [MAIN BOARD] (SIDE A) CT1 : AM Tracking Adjustment TP30 : FM Sgnal input L2 : FM Tracking Adjustment L5 : AM Frequency Coverage Adjustment L4 : AM Tracking Adjustment...

  • Page 9: Diagrams

    WM-FX488 SECTION 4 Ver 1.1 2003.01 DIAGRAMS 4-1. EXPLANATION OF IC TERMINALS Note on Schematic Diagram Waveforms • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or IC701 TC9329FA-CFX1740 (SYSTEM CONTROL) less are not indicated except for electrolytics and tantalums.

  • Page 10: Block Diagram

    WM-FX488 Ver 1.1 2003.01 4-2. BLOCK DIAGRAMS E, CH FM/AM FRONT END (FM DISC) IF DET, FM MPX QUAD IC701 (1/2) LOUT (FM IF) RF IN IF IN SYSTEM LCD701 CONTROL ROUT R-CH LIQUID FMRFOUT COM1 CRYSTAL DISPLAY TRACKING LPF1...

  • Page 11: Printed Wiring Boards

    WM-FX488 Ver 1.1 2003.01 4-3. PRINTED WIRING BOARDS Refer to page 9 for Notes. MAIN BOARD (SIDE B) MAIN BOARD (SIDE A) HEAD FLEXIBLE HP601 BOARD PLAYBACK HEAD Semiconductor Location Ref. No. Location D401 D402 D701 G-10 IC301 IC601 IC701...

  • Page 12: Schematic Diagram - Main Section (1/3)

    WM-FX488 Ver 1.1 2003.01 4-4. SCHEMATIC DIAGRAM – MAIN SECTION (1/3) – Refer to page 9 for Notes.

  • Page 13: Schematic Diagram - Main Section (2/3)

    WM-FX488 Ver 1.1 2003.01 4-5. SCHEMATIC DIAGRAM – MAIN SECTION (2/3) – Refer to page 9 for Notes.

  • Page 14: Schematic Diagram - Main Section (3/3)

    WM-FX488 Ver 1.1 2003.01 4-6. SCHEMATIC DIAGRAM – MAIN SECTION (3/3) – Refer to page 9 for Notes.

  • Page 15: Ic Block Diagrams

    WM-FX488 4-7. IC BLOCK DIAGRAMS IC1 TA2154FN (EL) BUFF FM/AM/TV PW SW 1/8 OR BUFF 1/16 IF BUFF LEVEL BUFF TV RF FM IF AM IF FM/TV FM MPX FM RF IC301 TA2160FN (EL) RF & REF PW C AGC DET...
  • Page 16 WM-FX488 IC601 MM1279XVBE MOTIVE CONTROL DRIVER CIRCUIT MOTIVE SOFT MOTIVE LOGIC SWITCH /OSC INVERTER BIAS VREF SPEED CURRENT REFERENCE CONTROL CONTROL VOLTAGE START OUTPUT BIAS...

  • Page 17: Exploded Views

    WM-FX488 SECTION 5 Ver 1.1 2003.01 EXPLODED VIEWS NOTE : • The mechanical parts with no reference number in the • -XX, -X mean standardized parts, so they exploded views are not supplied. may have some difference from the original •...

  • Page 18: Mechanism Deck Section

    WM-FX488 5-2. MECHANISM DECK SECTION (MF-WMFX488-114) supplied supplied not supplied supplied supplied supplied supplied M601 HP601 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-920-990-21 SPRING (UD), COMPRESSION X-3378-976-1 LEVER (NL) ASSY, PINCH 3-921-335-03 WASHER, LEVER X-3381-147-1 WHEEL ASSY, CAPSTAN 3-704-197-71 SCREW (M1.4)

  • Page 19: Electrical Parts List

    WM-FX488 Ver 1.1 2003.01 SECTION 6 MAIN ELECTRICAL PARTS LIST NOTE : • Due to standardization, replacements in the • Items marked “ * ”are not stocked since they When indicating parts by reference num- parts list may be different from the parts are seldom required for routine service.
  • Page 20 WM-FX488 Ver 1.1 2003.01 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C704 1-162-919-11 CERAMIC CHIP 22PF < COIL > C705 1-135-259-11 TANTAL. CHIP 10uF 6.3V C706 1-125-837-91 CERAMIC CHIP 6.3V 1-412-967-31 INDUCTOR 0.1uH C707 1-107-826-11 CERAMIC CHIP 0.1uF...
  • Page 21 WM-FX488 Ver 1.1 2003.01 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R113 1-216-829-11 METAL CHIP 4.7K 1/10W R714 1-216-833-11 METAL CHIP 1/10W R715 1-216-821-11 METAL CHIP 1/10W R114 1-216-821-11 METAL CHIP 1/10W R716 1-216-825-11 METAL CHIP 2.2K...

  • Page 22: Revision History

    WM-FX488 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision 2002.10...

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