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WM-FS420/FS420RS
SERVICE MANUAL
Ver 1.2 2001. 03
Sony Corporation
9-927-679-12
2001C1600-1
Audio Entertainment Group
© 2001.3
General Engineering Dept.
SPECIFICATIONS
Radio Frequency
FM : 87.5 – 108 MHz
AM : 530 – 1,710 kHz
(North, Central and South America)
531 – 1,602 kHz (Other countries)
3 V DC Batteries R6 (AA) × 2
Power Requirements
Approx. 108.4 × 125.7 × 47.2 mm
Dimensions (w/h/d)
× 5 × 1
3
(4
/
8
projecting parts and controls
Mass
Approx. 280 g (9.9 oz)/Approx. 355 g (12.6 oz)
(incl. batteries and a cassette)
Supplied Accessories
• Stereo headphones or earphones (1)
• Belt clip (1)
• Battery charger (1) (FS420RS only)
• Rechargeable battery
NC-WMAA, 1.2 V, 700 mAh, Ni-Cd (2) (FS420RS only)
• Rechargeable battery carrying case (1) (FS420RS only)
Design and specifications are subject to change without notice.
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
7
/
inches) incl.
8
RADIO CASSETTE PLAYER
US Model
Canadian Model
WM-FS420/FS420RS
AEP Model
E Model
WM-FS420
NEW
MF-WMFS420-114
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Table of Contents
Related Manuals for Sony WALKMAN WM-FS420RS
Summary of Contents for Sony WALKMAN WM-FS420RS
- Page 1 • Rechargeable battery NC-WMAA, 1.2 V, 700 mAh, Ni-Cd (2) (FS420RS only) • Rechargeable battery carrying case (1) (FS420RS only) Design and specifications are subject to change without notice. RADIO CASSETTE PLAYER Sony Corporation 9-927-679-12 2001C1600-1 Audio Entertainment Group © 2001.3...
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Page 2: Table Of Contents
TABLE OF CONTENTS 1. GENERAL 7. MEXPLODED VIEWS ·········································································· 2 7-1. Cabinet Assy Section ··················································· 18 2. SERVICE NOTE 7-2. Main Board Section ····················································· 19 ······························································· 3 7-3. Mechanism Deck Section-1 (MF-WMFS420-114) ·················································· 20 3. DISASSEMBLY 7-4. Mechanism Deck Section-2 3-1. -
Page 3: Service Note
Note : In case the parts in the figure are removed for repair, treat them to protect from water drop following the instructions in the figure (spread grease, bond etc.) • Sony grease SGL-601 : 7-651-000-10 Tapping screw (B)(1.4 × 4) Tapping screw (B)(1.4 ×... -
Page 4: Disassembly
SECTION 3 DISASSEMBLY Note : Disassemble the unit in the order as shown below. Chassis Sub Assy Main Board and Mechanism Deck Main Assembly Belt Head, Magnetic (HP901) Note : Follow the disassembly procedure in the numerical order given. 3-1. MAIN ASSEMBLY 5 Two screws (+B1.7 ×... -
Page 5: Chassis Sub Assy
3-2. CHASSIS SUB ASSY Main board 2 Knob (DX-Local) 1 Two claws 3 Chassis sub assy 3-3. MAIN BOARD AND MECHANISM DECK 4 Main board 3 Screw (M1.4 ) Toothed Lock 2 Remove the solder 1 Remove the solder (fouf points) 5 Stopper (MD) 6 Mechanism deck —... -
Page 6: Belt
3-4. BELT Belt Belt threading Capstan wheel assy(SP) Reel/Capstan motor Capstan wheel assy(SP) Belt 3-5. HEAD, MAGNETIC (HP901) 1 Two screws (M1.4) 2 Head, magnetic (HP901) — 6 —... -
Page 7: Mechanical Adjustment
SECTION 4 SECTION 5 MECHANICAL ADJUSTMENT ELECTRICAL ADJUSTMENT PRECAUTION 0 dB = 0.775 V TAPE SECTION Clean the following parts with a denatured-alcohol-moistened swab: playback head pinch roller Test Tape rubber belts capstan Tape Signal Used for Do not use a magnetized screwdriver for the adjustments. WS-48A 3 kHz, 0 dB Tape speed adjustment... - Page 8 • Repeat the procedures in each adjustment several times for the 0 dB = 1 µV TUNER SECTION maximum level meter indication. • Switch Location • The frequency coverage and tracking adjustments should be finally done by the trimmer capacitors. VOLUME : MAX MEGA BASS : OFF...
- Page 9 [MAIN BOARD] — Component side — FM Tracking Adjustment AM Tracking Adjustment AM Frequency Coverage Adjustment FM Frequency AM IF Coverage Adjustment Adjustment — Conductor side — TP22 FM IN TP30 — 9 —...
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Page 10: Diagrams
SECTION 6 DIAGRAMS 6-1. IC BLOCK DIAGRAMS TA2111F-(EL) MPX IN AM RF IN FM RF OUT RF VCC FM OSC AM OSC DET OUT LPF2 LPF1 L-OUT R-OUT DECODE BUFF DIVIDE MUTE ST/MO FM/AM LEVEL FM RF IN RF GND MIX OUT TUN LED ST LED... -
Page 11: Block Diagram
WM-FS420/FS420RS 6-2. BLOCK DIAGRAM TUNER +B FM/AM RF,IF AMP DET,MPX PRE POWER AMP 10.7MHz LOCAL IC301 RV301 QUAD STEREO MONO VOLUME J301 B.P.F FM RF IN DET OUT MPX IN L OUT MIX IN(L) MIX OUT(L) P OUT(L) NORMAL METAL H.PIN(L) P IN(L) Q101... -
Page 12: Schematic Diagram
WM-FS420/FS420RS • Refer to page 10 for IC Block Diagrams. 6-3. SCHEMATIC DIAGRAM • Refer to page 17 for IC Pin Function. (2.9) (2.8) (2.8) (2.1) 2.1Vp-p 13.3µsec 500mV/div µ sec/div *3: C40 68P: FS420RS 100P: FS420 +1.5V REG. *2: R107, R207 220: FS420RS 150: FS420 Note on Schematic Diagram:... -
Page 13: Printed Wiring Board
WM-FS420/FS420RS 6-4. PRINTED WIRING BOARD • Semiconductor Location Ref. No. Location D301 D701 D705 D706 IC301 IC701 IC702 Q101 Q102 Q201 Q202 Q301 Q302 Q303 Q304 Q501 Q502 Q503 S303 S301 TP30 TP22 Note on Printed Wiring Board: • X : parts extracted from the component side. •... -
Page 14: Ic Pin Function Description
SECTION 7 Ver 1.1 2000. 04 EXPLODED VIEWS NOTE: 6-5. IC PIN FUNCTION DESCRIPTION • -XX, -X mean standardized parts, so they may • The mechanical parts with no reference number • MAIN BOARD IC701 (DTC) LC72348W-9906 have some differences from the original one. in the exploded views are not supplied. -
Page 15: Main Board Section
7-2. MAIN BOARD SECTION MF-WMFS420-114 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-934-020-41 LID,BATTERY CASE 3-042-892-01 STOPPER (MD) 3-028-087-01 SPRING, TORSION 3-015-285-01 SCREW (M1.4),TOOTHED LOCK 3-318-203-82 SCREW (B1.7X7), TAPPING A-3021-315-A MAIN BOARD, COMPLETE (US,CND,MX) 3-934-005-01 KNOB(DX-LOCAL) A-3021-317-A MAIN BOARD, COMPLETE (AEP) X-3378-377-1 CHASSIS ASSY (US,CND,MX) A-3021-318-A MAIN BOARD, COMPLETE (E) -
Page 16: Mechanism Deck Section-1
7-3. MECHANISM DECK SECTION-1 (MF-WMFS420-114) HP901 M601 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-938-657-01 BELT 3-704-197-71 SCREW (M1.4) 3-920-997-01 SPRING (PINCH R) X-3369-749-1 PINCH LEVER (N) ASSY X-3369-748-1 PINCH LEVER (R) ASSY 3-920-996-01 SPRING (PINCH N) 3-703-816-31 SCREW (M1.4), SPECIAL HEAD HP901 1-500-648-11 HEAD, MAGNETIC (PLAYBACK) -
Page 17: (Mf-Wmfs420-114)
Ver 1.2 2001. 03 7-4. MECHANISM DECK SECTION-2 (MF-WMFS420-114) Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-921-797-01 WASHER 3-022-094-01 SPRING (STOP-S) 3-938-628-01 SPRING (PLAY-CP) 3-728-091-01 WASHER, STOPPER 3-019-773-01 GEAR (AS) 3-019-778-01 SLEEVE (MS) 3-021-786-01 LEVER (FS), D SELECTION 3-921-335-03 WASHER, LEVER 3-028-792-01 LEVER (BS), DETECTION 3-920-990-02 SPRING (UD), COMPRESSION... -
Page 18: Electrical Pparts 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 19 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C604 1-165-176-11 CERAMIC CHIP 0.047uF 10.00% 16V < JUMPER > C605 1-165-176-11 CERAMIC CHIP 0.047uF 10.00% 16V C606 1-117-863-11 CERAMIC CHIP 0.47uF 10.00% 6.3V 1-216-296-91 SHORT C607 1-135-187-21 TANTAL.
- Page 20 MAIN HEADPHONE Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 1-216-837-11 METAL CHIP 1/16W R716 1-216-833-11 RES-CHIP 1/16W 1-216-845-11 METAL CHIP 100K 1/16W R717 1-216-829-11 METAL CHIP 4.7K 1/16W 1-216-815-11 METAL CHIP 1/16W R718 1-216-845-11 METAL CHIP 100K 1/16W 1-216-109-00 METAL CHIP...
- Page 21 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks MISCELLANEOUS ************** HARDWARE LIST ************** ************** HP901 1-500-648-11 HEAD, MAGNETIC (PLAYBACK) M601 1-763-073-11 MOTOR (REEL/CAPSTAN)(WITH PULLEY) 7-624-101-04 STOP RING 1.2 (E TYPE) 7-626-311-81 SPRING-PIN 1.6X18 ************************************************************** 7-627-850-67 SCREW,PRECISION +P 1.4X4 ACCESSORIES &...
- Page 22 WM-FS420/FS420RS 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 2001.03 Correct the Exploded views section.