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Sony WM-EX422 Service Manual
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Sony WM-EX422 Service Manual

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See also: Operating Instructions
SERVICE MANUAL
Ver 1.1 2003.12
• Frequency response
Playback: 30 - 18 000 Hz
• Output
Headphones (i) jack Load impedance 8 - 300 Ω
• Power requirements
1.5V DC, battery R6 (AA) x 1
• Dimensions (w/h/d)
Approx. 111.2 x 81.1 x 29.5 mm (4
projecting parts and controls
• Mass
Approx. 124 g (4.4 oz) (main unit only)
• Supplied accessories
Stereo headphones or earphones (1)
Hand strap (1) (European model only)
Carrying pouch (1) (Asian model only)
Design and specifications are subject to change without notice.
Sony Corporation
9-877-095-02
2003L02-1
Personal Audio Company
© 2003.12
Published by Sony Engineering Corporation
WM-EX422
Model Name Using Similar Mechanism
MD Mechanism Type

SPECIFICATIONS

1
1
3
⁄
x 3
⁄
x1
⁄
in.), excl.
2
4
16
Battery life* (approximate hours)
Sony alkaline LR6 (SG)**
Tape playback
35
* Measured value by the standard of JEITA (Japan Electronics and
Information Technology Industries Association).
(Using a Sony HF series cassette tape)
**When using a Sony LR6(SG) "STAMINA" alkaline dry battery
(produced in Japan).
Note
• The battery life may be shorter depending on the operating condition, the
surrounding temperature and battery type.
CASSETTE PLAYER
E Model
NEW
MF-WMFX495-147
Sony R6P (SR)
9

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  • Page 1: Specifications

    Approx. 111.2 x 81.1 x 29.5 mm (4 ⁄ ⁄ ⁄ in.), excl. **When using a Sony LR6(SG) “STAMINA” alkaline dry battery projecting parts and controls (produced in Japan). • Mass Approx. 124 g (4.4 oz) (main unit only) Note •...

  • Page 2: Table Of Contents

    WM-EX422 TABLE OF CONTENTS Flexible Circuit Board Repairing Specifications ................1 • Keep the temperature of the soldering iron around 270°C during 1. SERVICING NOTE repairing............3 • Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

  • Page 3: Servicing Note

    WM-EX422 SECTION 1 SERVICING NOTES 3. FF, REW modes This set detects the rotation of the idler gear (A) (side S) using the photo reflector (PH751). The PH751 is mounted on the MAIN 1) Check that the preset state is set.

  • Page 4: General

    WM-EX422 SECTION 2 GENERAL This section is extracted from instruction manual. To attach the hand strap* OPEN HOLD AVLS VOL** MEGA BASS BATT Y•DIRECTION*** Supplied with the European model only. ** There is a tactile dot beside VOL to show the direction to turn up the volume.

  • Page 5: Disassembly

    WM-EX422 SECTION 3 DISASSEMBLY The equipment can be removed using the following procedure. Cabinet center MAIN board Mechanism deck Cabinet (front) sub assy Cassette holder sub assy Note : Follow the disassembly procedure in the numerical order given. 3-1. CABINET (FRONT) SUB ASSY 2 Screw (B 1.7 ×...

  • Page 6: Main Board

    WM-EX422 3-2. MAIN BOARD 3 Screw (1.7 × 2.5), tapping 2 Unsolder leads from motor (four places) 6 MAIN board Cabinet (center) assy 1 Unsolder HEAD flexible board 4 Claws 3-3. MECHANISM DECK 3 Mechanism deck Cabinet (center) assy 1 Claws...

  • Page 7: Cassette Holder Sub Assy

    WM-EX422 3-4. CASSETTE HOLDER SUB ASSY • Use caution when installing the cassette holder assy Install the cassette holder sub assy with the spring (lid up) as shown below in the drawing so that it fits into the holes on the cabinet center. Once installed, fit the left and right pieces on.

  • Page 8: Adjustments

    WM-EX422 SECTION 4 ADJUSTMENTS 4-1. MECHANICAL ADJUSTMENTS 4-2. ELECTRICAL ADJUSTMENTS PRECAUTION PRECAUTION 1. Clean the following parts with a denatured-alcohol-moistened • Supplied voltage : 1.5V. swab : • Switch and control position playback head pinch roller MEGA BASS : NORMAL...

  • Page 9: Diagrams

    WM-EX422 SECTION 5 DIAGRAMS 5-1. BLOCK DIAGRAMS +2.5V IC701 (1/2) S703 SYSTEM +2.5V CONTROL DIRECTION S705 D701 PH751 (BATT) 9 PHOTO CTRL S704 BATT_CTL2 BATT_CTL3 S702 GATE IN-PHOTO Q751 KEY_IN VBAT S601 (MD CONT) S701 S302 S303 HOLD B AVLS...

  • Page 10: Printed Wiring Boards

    WM-EX422 5-2. PRINTED WIRING BOARDS See page 12 for Notes. Semiconductor MAIN BOARD (SIDE B) MAIN BOARD (SIDE A) Location Ref. No. Location D701 D702 N VOL D711 D713 IC301 IC601 IC701 IC702 IC703 IC704 PH751 Q101 Q102 Q201 Q202...

  • Page 11: Schematic Diagram

    WM-EX422 5-3. SCHEMATIC DIAGRAM See page 12 for Notes.

  • Page 12: Ic Block Diagrams

    WM-EX422 Waveforms 5-4. IC BLOCK DIAGRAMS 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. IC301 TA2160FN (EL) • All resistors are in Ω and W or less unless otherwise speci- fied.

  • Page 13: Exploded Views

    WM-EX422 SECTION 6 Ver 1.1 EXPLODED VIEWS NOTE : • -XX, -X mean standardized parts, so they • Items marked “ * ”are not stocked since they are seldom • Hardware (# mark) list and accessories and may have some difference from the original required for routine service.

  • Page 14: Mechanism Deck Section

    WM-EX422 6-2. MECHANISM DECK SECTION (MF-WMFX495-147) not supplied not supplied HP601 M601 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark X-3375-020-2 PINCH LEVER (N-F) ASSY 3-021-974-04 SPRING (HEAD BASE) X-3372-619-3 WHEEL ASSY (NP), CAPSTAN 3-704-197-01 SCREW (M1.4), SPECIAL HEAD...

  • Page 15: Electrical Parts List

    WM-EX422 SECTION 7 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 16 WM-EX422 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark Q302 8-729-230-72 TRANSISTOR 2SA1362YG R706 1-218-895-11 METAL CHIP 100K 0.5% 1/10W Q303 8-729-903-10 TRANSISTOR FMW1 R707 1-218-871-11 METAL CHIP 0.5% 1/10W Q305 8-729-425-94 TRANSISTOR XP1116-TXE R708...
  • Page 17 WM-EX422 Ref. No. Part No. Description Remark MISCELLANEOUS ************* HP601 1-500-648-11 HEAD, MAGNETIC (PLAYBACK) M601 1-763-798-11 MOTOR, DC (CAPSTAN/REEL) ****************************************************** ACCESSORIES *********** 3-220-749-01 CASE, CARRYING 3-253-260-41 MANUAL, INSTRUCTION (ENGLISH, TRADITIONAL CHINESE) 8-954-008-93 RECEIVER,EAR MDR-E808LP...
  • Page 18 WM-EX422 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 2003.02...

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