Table of Contents
Advertisement
SERVICE MANUAL
Ver 1.0 2001. 04
Sony Corporation
9-873-121-11
2001D1600-1
Personal Audio Company
© 2001.4
Shinagawa Tec Service Manual Production Group
WM-FS421
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
SPECIFICATIONS
• Frequency range
FM: 87.5 - 108 MHz
AM: 530 - 1 710 kHz (North, Central and South America)
531 - 1 602 kHz (Other countries)
• Power requirements
3 V DC batteries R6 (size AA) × 2
• Dimensions (w/h/d)
Approx. 107.3 × 123.3 × 51.5 mm (4
1
⁄
4
excluding projecting parts and controls
• Mass
Approx. 282 g (10.0 oz) (main unit only)
• Supplied accessories
Stereo headphones or earphones (1)
Belt clip (1)
Design and specifications are subject to change without notice.
Battery life (approximate hours)
Tape
playback
Sony alkaline LR6 (SG)**
32
Sony R6P (SR)
9
* Measured value by the standard of JEITA (Japan Electronics
and Information Technology Industries Association). (Using
a Sony HF series cassette tape)
**When using Sony LR6 (SG) "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.
× 4
× 2
7
⁄
1
⁄
inches),
8
8
(JEITA*)
Radio
reception
40
14
RADIO CASSETTE PLAYER
E Model
NEW
MF-WMFS421-114
Advertisement
Table of Contents
Related Manuals for Sony WM-FS421
Summary of Contents for Sony WM-FS421
- Page 1 * Measured value by the standard of JEITA (Japan Electronics and Information Technology Industries Association). (Using a Sony HF series cassette tape) **When using Sony LR6 (SG) “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.
-
Page 2: Table Of Contents
WM-FS421 TABLE OF CONTENTS 1. GENERAL 7. MEXPLODED VIEWS ·········································································· 2 7-1. Cabinet Assy Section ··················································· 15 2. SERVICE NOTE 7-2. MAIN Board Section ·················································· 16 ······························································· 3 7-3. Mechanism Deck Section-1 (MF-WMFS421-114) ·················································· 17 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
WM-FS421 SECTION 3 DISASSEMBLY Note : Disassemble the unit in the order as shown below. Chassis Sub Assy MAIN Board and Mechanism Deck Belt Main Assy Head, Magnetic (HP701) Note : Follow the disassembly procedure in the numerical order given. -
Page 5: Chassis Sub Assy
WM-FS421 3-2. CHASSIS SUB ASSY MAIN board 1 Two claws 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 (four points) 5 Stopper (L2) -
Page 6: Belt
WM-FS421 3-4. BELT Belt Belt threading Capstan wheel assy(SP) Reel/Capstan motor Capstan wheel assy(SP) Belt 3-5. HEAD, MAGNETIC (HP701) 1 Two screws (M1.4) 2 Head, magnetic (HP701) -
Page 7: Mechanical Adjustment
WM-FS421 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. - Page 8 WM-FS421 FM VCO Adjustment 0 dB = 1 µV TUNER SECTION Procedure: • Switch Location VOLUME : MAX [MAIN BOARD] (SIDE B) MEGA BASS : OFF AVLS : NORMAL BAND: AM AM RF signal generator Put the lead-wire antenna close to the set.
- Page 9 WM-FS421 [MAIN BOARD] — Component side — AM Frequency AM Tracking Adjustment Coverage Adjustment AM Tracking Adjustment FM Tracking Adjustment RV1: FM VCO Adjustment RV2: AM IF Adjustment — Conductor side — FM IN TP(VCO)
-
Page 10: Diagrams
WM-FS421 SECTION 6 DIAGRAMS 6-1. IC BLOCK DIAGRAMS CXA1960Q 22 21 MPRM AM RF FM RF TVRO TV RF REGV V12M OL DET 1.25V FM/TV OSC MUTE FM LMT FTLO MUTE 150kHz FM DET FM/TV AAGC FMBF 1.25V AM/FM: 1/2... -
Page 11: Block Diagram
WM-FS421 6-2. BLOCK DIAGRAM FM/AM RF,IF AMP IC301 DET,MPX PRE POWER AMP RV301 w VOLUME B.P.F TVIN J301 LOUT MIXIN(L) MIXOUT(L) PWOUT(L) B.P.F FMIN Q301(1/2) H.PIN(L) Q200(1/2) PWIN(L) PRENF(L) PWOUT(R) AF IF PWOUT(C) IFCT ROUT MIXIN(R) MIXOUT(R) H.PIN(R) PWIN(R) Q301(2/2) -
Page 12: Printed Wiring Board
WM-FS421 6-3. PRINTED WIRING BOARD • Semiconductor Location Ref. No. Location D403 FERRIRE.ROD D404 ANTENNA D701 IC301 IC701 IC702 Q200 Q301 Q501 Q502 Q701 TP(VCO) 0FF - ON > HP701 Note on Printed Wiring Board: • X : parts extracted from the component side. -
Page 13: Schematic Diagram
WM-FS421 6-4. SCHEMATIC DIAGRAM • Refer to page 10 for IC Block Diagrams. • Refer to page 17 for IC Pin Function. AM IF IC B/D FM VCO IC B/D Note on Schematic Diagram: • All capacitors are in µF unless otherwise noted. pF: µµF •... -
Page 14: Ic Pin Function Description
WM-FS421 6-5. IC PIN FUNCTION DESCRIPTION • MAIN BOARD IC702 (DTC) LC72348W-9906 Pin No. Pin Name Description XOUT Crystal output TEST2 — PA0-PA3 Key input PB1-PB3 Key output AVLS AVLS output MOTOR CTL MOTOR control LOCAL/DX/NOR/METAL NOMAL/METAL(DX/LOCAL) select output E/CA... -
Page 15: Cabinet Assy Section
WM-FS421 SECTION 7 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • The mechanical parts with no reference number have some differences from the original one. in the exploded views are not supplied. • Items marked “*” are not stocked since they •... -
Page 16: Main Board Section
WM-FS421 7-2. MAIN BOARD SECTION MF-WMFS421-114 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-227-295-01 LID, BATTERY CASE 3-224-939-01 STOPPER (L2) 3-231-465-01 SPRING, TORSION 3-015-285-01 SCREW (M1.4),TOOTHED LOCK (WH) 3-318-203-32 SCREW (B1.7), TAPPING * 63 A-3021-390-A MAIN BOARD, COMPLETE... -
Page 17: Mechanism Deck Section-1
WM-FS421 7-3. MECHANISM DECK SECTION-1 (MF-WMFS421-114) HP701 M601 supplied @ @ @ supplied @ @ @ 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... -
Page 18: Mechanism Deck Section-2
WM-FS421 7-4. MECHANISM DECK SECTION-2 (MF-WMFS421-114) not supplied Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-921-797-01 WASHER 3-728-091-01 WASHER, STOPPER 3-021-786-01 LEVER (FS), D SELECTION 3-923-530-11 SLEEVE (M) 3-921-052-11 LEVER (A), DETECTION 3-921-335-01 WASHER, LEVER... -
Page 19: Electrical Parts List
WM-FS421 SECTION 8 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • CAPACITORS: • SEMICONDUCTORS parts list may be different from the parts uF: µF In each case, u: µ, for example: specified in the diagrams or the components •... - Page 20 WM-FS421 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C712 1-128-110-11 ELECT 470uF 20.00% 4V < RESISTOR > C713 1-128-110-11 ELECT 470uF 20.00% 4V C714 1-162-964-11 CERAMIC CHIP 0.001uF 1-216-821-11 METAL CHIP 1/16W 1-216-825-11 METAL CHIP 2.2K...
- Page 21 WM-FS421 MAIN HEADPHONE Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R707 1-216-845-11 METAL CHIP 100K 1/16W 1-681-169-11 HEADPHONE BOARD R708 1-216-849-11 METAL CHIP 220K 1/16W ***************** R709 1-216-809-11 METAL CHIP 1/16W R710 1-216-833-11 METAL CHIP...
-
Page 22: Revision History
WM-FS421 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...