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Sony WALKMAN WM-SR10 Service Manual
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Sony WALKMAN WM-SR10 Service Manual

Radio cassette-corder
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SERVICE MANUAL
Ver 1.1 2003. 05
Frequency range
FM: 87.5 - 108 MHz (Saudi Arabia)
87.6 - 107.9 MHz (Other countries)
AM: 526.5 - 1 606.5 kHz (Saudi Arabia)
531 - 1 602 kHz (Other countries)
Frequency response
Input
Microphone (MIC) jack
Output
Headphones (i) jack, Load impedance 8 - 300 Ω
Speaker
Approx. 5 cm (2 in.) dia.
Power requirement
Dimensions
Approx. 112.0 × 82.5 × 37.5 mm (4
(w/h/d), excl. projecting parts and controls
Mass Approx. 187 g (6.6 oz) (main unit only)
Supplied accessory
Stereo headphones or Stereo earphones (1)
Design and specifications are subject to change without
notice.
Sony Corporation
9-874-215-02
2003E16-1
Personal Audio Company
© 2003.05
Published by Sony Engineering Corporation
Model Name Using Similar Mechanism
Tape Transport Mechanism Type

SPECIFICATIONS

Playback: 40 - 15 000 Hz
Recording: 100 - 8 000 Hz
3V DC
Batteries R6 (AA) x 2
External DC 3 V power sources
1
1
1
⁄
× 3
⁄
× 1
⁄
inches)
2
4
2
WM-SR10
Battery life* (approximate hours)
Sony alkaline LR6(SG)
(using headphones/earphones)
Tape playback
24
Radio reception
48
Mic recording
20
Radio recording
12
(using the speaker)
Tape playback
15
Radio reception
26
Radio recording
11.5
* Measured value by the standard of JEITA (Japan Electronics and
Information Technology Industries Association).
(Using a Sony HF series cassette tape)
** When using LR6 (SG) Sony "STAMINA" alkaline dry batteries
(produced in Japan).
Note
The battery life may be shorter depending on the operating
condition, the surrounding temperature and battery type.
RADIO CASSETTE-CORDER
E Model
WM-GX221
MT-WMGX221-175
**
Sony R6P(SR)
7
15
4.5
3
4.5
6
3

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Summary of Contents for Sony WALKMAN WM-SR10

  • Page 1: Specifications

    Supplied accessory Information Technology Industries Association). Stereo headphones or Stereo earphones (1) (Using a Sony HF series cassette tape) ** When using LR6 (SG) Sony “STAMINA” alkaline dry batteries Design and specifications are subject to change without (produced in Japan). notice.

  • Page 2: Table Of Contents

    WM-SR10 TABLE OF CONTENTS 1. SERVICE NOTE Notes on chip component replacement ............... 3 • Never reuse a disconnected chip component. • Notice that the minus side of a tantalum capacitor may be 2. GENERAL ................4 damaged by heat. 3.

  • Page 3: Service Note

    WM-SR10 SECTION 1 SERVICE NOTE In this set, record/play mode is detected using the switch S704 (TAPE POWER). S704 is mounted on the MAIN board. If MAIN board is removed, it becomes impossible to detect record/play mode. Where MAIN board is removed, when you measure operation and voltage of each part of the mechanism deck, please turn on S704.

  • Page 4: General

    WM-SR10 SECTION 2 GENERAL This section is extracted from instruction manual. • LOCATION OF CONTROLS PAUSE (RADIO OFF) TAPE/ AM/FM MFF/CUE mREW/REVIEW BATT indicator NPLAY** zREC VOL* xSTOP TUNING SPEAKER/ i FM ST/MONO DC IN 3 V Built-in microphone SOUND BOOST MIC (PLUG IN POWER)** AVLS Battery compartment...

  • Page 5: Disassembly

    WM-SR10 SECTION 3 DISASSEMBLY Note : Disassemble the unit in the order as shown below. MECHANISM DECK FRONT CABINET ASSY MAIN BOARD (MT-WMGX221-175) BELT (CAP), M601, CASSETTE HOLDER SUB ASSY HRP901, HE901 Note : Follow the disassembly procedure in the numerical order given. 3-1.

  • Page 6: Main Board

    WM-SR10 3-2. MAIN Board 2 plate connector (L) 8 joint cover 1 screw (TP B1.7 × 4) 7 MAIN board 3 Remove soldering 4 Remove soldering from the four points. from the four points. 6 two screws (TP B1.7 × 4) 5 screw (M1.4 ×...

  • Page 7: Belt (Cap), M601, Hrp901, He901

    WM-SR10 3-4. Belt (CAP), M601, HRP901, HE901 screw two screws HRP901 (REC/PB head) Attaching belt (CAP). HE901 (erase head) washer M601 (stopper N) (capstan/reel washer motor) belt (CAP) 5 washer 6 capstan fly assy (AR) two screws (M1.4) belt (CAP) 3-5.

  • Page 8: Mechanical Adjustment

    WM-SR10 SECTION 4 SECTION 5 MECHANICAL ADJUSTMENT ELECTRICAL ADJUSTMENT PRECAUTION PRECAUTION Clean the following parts with a denatured-alcohol-moistened Specified voltage: 2.5 V (DC) swab: Switch and control position record/playback/erase head pinch roller : MAX rubber belts capstan SPEAKER : OFF Demagnetize the record/playback head with a head demagnet- AVLS : NORM...
  • Page 9 WM-SR10 • Repeat the procedures in each adjustment several times. TUNER SECTION 0dB=1µV AM FREQUENCY COVERAGE ADJUSTMENT [AM] Adjust for a maximum reading on level meter. BAND : AM 505 kHz (516.5 kHz) CT1-4 1,680 kHz (1,631.5 kHz) AM RF signal generator ( ) : EA MODEL Put the lead-wire...

  • Page 10: Diagrams

    WM-SR10 SECTION 6 DIAGRAMS Note on Schematic Diagram: Note on Printed Wiring Board: • All capacitors are in µF unless otherwise noted. p: pF. • Y : parts extracted from the conductor side. 50 WV or less are not indicated except for electrolytics and •...

  • Page 11: Block Diagram - Tuner Section

    WM-SR10 6-1. Block Diagram – Tuner Section – • SIGNAL PATH : FM : AM 10.7MHz FM/AM RF AMP, FM/AM MIX AMP, FM/AM OSC, FM/AM IF AMP, DET, MPX FM-RF TU L, TU R 10.7MHz L OUT IF IN RF AMP FM/AM B.P.F.

  • Page 12: Block Diagram - Main Section

    WM-SR10 6-2. Block Diagram – Main Section – TU L, TU R TU L TU R IC501 (1/2) IC501 (2/2) Q714 REC/PB AMP MIC AMP, ALC MUTING J501 (PLUG IN POWER) IN (L) OUT (L) IN (L) OUT (L) IC151 PB AMP POWER AMP OUT (L)

  • Page 13: Printed Wiring Boards

    WM-SR10 6-3. Printed Wiring Boards • : Uses unleaded solder. –1 –2 S703 BATT TAPE (RADIO OFF) /REEL MOTOR IC301 SP251 (SPEAKER) (ERASE) • Semiconductor Location Ref. No. Location Ref. No. Location IC501 TUNING Q403 Q501 Q502 Q551 D234 Q553 D301 Q701 D302...

  • Page 14: Schematic Diagram - Main Board (1/2)

    WM-SR10 6-4. Schematic Diagram – MAIN Board (1/2) – • Refer to page 16 for IC Block Diagram. Q501 UN5114-TX 1000p Q502 XP1214 MONO STEREO C503 1000p 10V (B) 1000p C519 4700p C251 C153 R501 R515 AM RF 4V EC 2.2k R514 C520...

  • Page 15: Schematic Diagram - Main Board (2/2)

    WM-SR10 6-5. Schematic Diagram – MAIN Board (2/2) – • Refer to page 10 for Waveforms. • Refer to page 16 for IC Block Diagrams. C203 470p MIX-IN MIX-IN C103 470p TAPE-SW R610 S704 S301(1/4) S301(2/4) Q703 Q403 MAIN XP1215 2SB1679 R609 R115...

  • Page 16: Ic Block Diagrams

    WM-SR10 6-6. IC Block Diagrams IC1 TA2111FN (EL) IC151 LM4871MM SHUTDOWN BIAS DECODE AV=-1 DIVIDE MUTE BYPASS FM OSC LEVEL ST/MO AM OSC AM DET FM DET FM/AM FM MIX VDD/2 AM MIX TUNE IC301 LB8115W-NA-TLM IC501 TA8155FN (ER) 48 47 46 45 44 43 FREQ VCC (REC) PRE DRIVER...

  • Page 17: Exploded Views

    WM-SR10 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. 9E : E model without the indication of the •...

  • Page 18: Cabinet (Front) Section

    WM-SR10 Ver 1.1 2003.05 7-2. Cabinet (Front) Section MIC501 supplied SP251 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-244-961-01 RING (SPEAKER) 1-824-629-21 CABLE, FLEXIBLE FLAT 6P 3-244-970-01 GRILLE (SPEAKER) 3-248-626-01 SCREW, TAPPING (B2.0) 3-244-963-01 WINDOW (DIAL) (EXCEPT EA) 1-823-820-11 WIRE (SPEAKER) 3-244-963-11 WINDOW (DIAL) (EA) 3-237-125-01 LID, BATTERY CASE...

  • Page 19: Mechanism Deck Section-1 (Mt-Wmgx221-175)

    WM-SR10 7-3. Mechanism Deck Section - 1 (MT-WMGX221-175) A (Included in Ref. No.151) supplied HE901 HRP901 supplied M601 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-704-197-01 SCREW (M1.4), SPECIAL HEAD 3-234-861-01 GUIDE (ARO), TAPE 3-234-857-01 BELT (CAP) 3-703-816-23 SCREW (M1.4X2.5), SPECIAL HEAD X-3379-877-1 FLY ASSY (AR), CAPSTAN X-3379-882-1 PINCH (N) ASSY, ARM...

  • Page 20: Mechanism Deck Section-2 (Mt-Wmgx221-175)

    WM-SR10 7-4. Mechanism Deck Section - 2 (MT-WMGX221-175) (Including Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks X-3381-206-1 CHASSIS ASSY (ARO) 3-229-064-01 WASHER, STOPPER 3-225-385-01 GEAR (B) 3-225-393-01 LEVER (SHUT/OFF) 3-229-063-01 SPRING (UD) (R), COMPRESSION 3-321-813-71 WASHER, COTTER POLYETHYLENE 3-019-778-01 SLEEVE (MS) X-3379-881-1 CLUTCH ASSY (AR) 3-728-091-01 WASHER, STOPPER...

  • Page 21: Electrical Parts List

    WM-SR10 SECTION 8 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • RESISTORS When indicating parts by reference number, parts list may be different from the parts All resistors are in ohms. please include the board name. specified in the diagrams or the components METAL: metal-film resistor •...
  • Page 22 WM-SR10 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C319 1-113-690-11 ELECT CHIP 220uF 20.00% 4V < CONNECTOR > C400 1-107-826-11 CERAMIC CHIP 0.1uF 10.00% 16V C401 1-162-964-11 CERAMIC CHIP 0.001uF CN701 1-691-344-11 CONNECTOR, FFC/FPC (ZIF) 6P C402 1-104-852-11 TANTAL.
  • Page 23 WM-SR10 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 1-460-066-22 COIL (FM OSC)(EA) R103 1-216-837-11 METAL CHIP 1/10W 1-428-874-21 COIL (AM OSC)(EXCEPT EA) R104 1-216-833-11 METAL CHIP 1/10W 1-428-875-21 COIL (AM OSC)(EA) R105 1-216-857-11 METAL CHIP 1/10W <...
  • Page 24 WM-SR10 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R506 1-216-841-11 METAL CHIP 1/10W < SWITCH > R507 1-216-857-11 METAL CHIP 1/10W R508 1-216-825-11 METAL CHIP 2.2K 1/10W 1-771-350-31 SWITCH, SLIDE (FM ST/MONO) R509 1-216-825-11 METAL CHIP 2.2K 1/10W S301...
  • Page 25 WM-SR10 MEMO...
  • Page 26 WM-SR10 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.

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