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Sony Sports Walkman WM-FS421, Service Manual

The Sony Sports Walkman WM-FS421 is a high-performance portable audio player designed for active individuals. With its durable and waterproof construction, you can enjoy your favorite tunes while on the move. Need assistance? Download the free Service Manual from manualshive.com for detailed instructions and troubleshooting tips.

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Ref. No.

Part No.

Description

Remarks

Ref. No.

Part No.

Description

Remarks

20

WM-FS421

C712

1-128-110-11 ELECT

470uF

20.00% 4V

C713

1-128-110-11 ELECT

470uF

20.00% 4V

C714

1-162-964-11 CERAMIC CHIP

0.001uF

10%

50V

<

 TRIMMER >

CT1

1-141-422-11 CAP, ADJ 10PF

<

 DIODE >

D1

8-759-072-60 DIODE   SVC347T-TL

D2

8-719-050-97 DIODE   MA357(Q)-(TX).SO

D4

8-719-050-97 DIODE   MA357(Q)-(TX).SO

D403

8-719-158-49 DIODE   MA8120-TX

D404

8-719-404-50 DIODE   MA111-TX

D703

8-719-049-09 DIODE   1SS367-T3SONY

<

 FERRITE BEAD >

FB101

1-500-245-11 FERRITE

0uH

FB201

1-500-245-11 FERRITE

0uH

FB301

1-500-245-11 FERRITE

0uH

<

 IC >

IC1 8-752-073-35 IC   CXA1960Q
IC301 8-759-665-91 IC   LB8115W-NA-TLM
IC701 8-759-457-70 IC   XC62RP1602MR
IC702 8-759-829-35 IC   LC72348W-CFX1726

<

JUMPER>

JC2

1-216-864-11 METAL CHIP

0

5%

1/16W

JC9

1-216-864-11 METAL CHIP

0

5%

1/16W

JC302

1-216-864-11 METAL CHIP

0

5%

1/16W

JC402

1-216-864-11 METAL CHIP

0

5%

1/16W

JC407

1-216-864-11 METAL CHIP

0

5%

1/16W

JC408

1-216-864-11 METAL CHIP

0

5%

1/16W

JC409

1-216-864-11 METAL CHIP

0

5%

1/16W

JC706

1-216-864-11 METAL CHIP

0

5%

1/16W

JC707

1-216-864-11 METAL CHIP

0

5%

1/16W

JC708

1-216-864-11 METAL CHIP

0

5%

1/16W

<

 COIL >

L1

1-412-967-31 INDUCTOR

0.1uH

L2

1-412-967-31 INDUCTOR

0.1uH

L3

1-754-166-11 ANTENNA, FERRITE-ROD(MW)

L4

1-424-763-11 COIL, RF (FM)

L6

1-469-781-11 INDUCTOR

30nH

L7

1-419-540-11 COIL, OSCILLATION (AM)

L402

1-412-033-11 INDUCTOR CHIP 220uH

L702

1-412-995-21 INDUCTOR

22uH

<

 TRANSISTOR >

Q3

8-729-423-52 TRANSISTOR

2SC3931-C-TX

Q200

8-729-402-13 TRANSISTOR

XN1501-TX

Q301

8-729-422-54 TRANSISTOR

XN4215-TX

Q501

8-729-046-89 TRANSISTOR

2SB970-S(TX).S0

Q502

8-729-402-13 TRANSISTOR

XN1501-TX

Q701

8-729-046-89 TRANSISTOR

2SB970-S(TX).S0

<

 RESISTOR >

R1

1-216-821-11 METAL CHIP

1K

5%

1/16W

R3

1-216-825-11 METAL CHIP

2.2K

5%

1/16W

R4

1-216-817-11 METAL CHIP

470

5%

1/16W

R5

1-216-833-11 METAL CHIP

10K

5%

1/16W

R6

1-216-823-11 METAL CHIP

1.5K

5%

1/16W

R7

1-216-833-11 METAL CHIP

10K

5%

1/16W

R8

1-216-833-11 METAL CHIP

10K

5%

1/16W

R10

1-216-833-11 METAL CHIP

10K

5%

1/16W

R11

1-216-833-11 METAL CHIP

10K

5%

1/16W

R12

1-216-803-11 METAL CHIP

33

5%

1/16W

R13

1-216-813-11 METAL CHIP

220

5%

1/16W

R14

1-216-825-11 METAL CHIP

2.2K

5%

1/16W

R15

1-216-845-11 METAL CHIP

100K

5%

1/16W

R17

1-216-833-11 METAL CHIP

10K

5%

1/16W

R18

1-216-845-11 METAL CHIP

100K

5%

1/16W

R19

1-216-833-11 METAL CHIP

10K

5%

1/16W

R20

1-216-821-11 METAL CHIP

1K

5%

1/16W

R101

1-216-835-11 METAL CHIP

15K

5%

1/16W

R102

1-216-835-11 METAL CHIP

15K

5%

1/16W

R103

1-216-855-11 METAL CHIP

680K

5%

1/16W

R104

1-216-819-11 METAL CHIP

680

5%

1/16W

R105

1-216-819-11 METAL CHIP

680

5%

1/16W

R106

1-216-831-11 METAL CHIP

6.8K

5%

1/16W

R107

1-216-864-11 METAL CHIP

0

5%

1/16W

R108

1-216-829-11 METAL CHIP

4.7K

5%

1/16W

R200

1-216-821-11 METAL CHIP

1K

5%

1/16W

R201

1-216-835-11 METAL CHIP

15K

5%

1/16W

R202

1-216-835-11 METAL CHIP

15K

5%

1/16W

R203

1-216-855-11 METAL CHIP

680K

5%

1/16W

R204

1-216-819-11 METAL CHIP

680

5%

1/16W

R205

1-216-819-11 METAL CHIP

680

5%

1/16W

R206

1-216-831-11 METAL CHIP

6.8K

5%

1/16W

R207

1-216-864-11 METAL CHIP

0

5%

1/16W

R208

1-216-829-11 METAL CHIP

4.7K

5%

1/16W

R301

1-216-829-11 METAL CHIP

4.7K

5%

1/16W

R302

1-216-789-11 METAL CHIP

2.2

5%

1/16W

R303

1-216-845-11 METAL CHIP

100K

5%

1/16W

R304

1-216-821-11 METAL CHIP

1K

5%

1/16W

R305

1-216-849-11 METAL CHIP

220K

5%

1/16W

R404

1-216-821-11 METAL CHIP

1K

5%

1/16W

R501

1-216-819-11 METAL CHIP

680

5%

1/16W

R502

1-216-829-11 METAL CHIP

4.7K

5%

1/16W

R503

1-216-833-11 METAL CHIP

10K

5%

1/16W

R504

1-216-847-11 METAL CHIP

150K

5%

1/16W

R601

1-216-833-11 METAL CHIP

10K

5%

1/16W

R602

1-216-835-11 METAL CHIP

15K

5%

1/16W

R603

1-216-821-11 METAL CHIP

1K

5%

1/16W

R604

1-216-845-11 METAL CHIP

100K

5%

1/16W

R605

1-216-821-11 METAL CHIP

1K

5%

1/16W

R606

1-216-821-11 METAL CHIP

1K

5%

1/16W

R607

1-216-837-11 METAL CHIP

22K

5%

1/16W

R701

1-216-845-11 METAL CHIP

100K

5%

1/16W

R702

1-216-829-11 METAL CHIP

4.7K

5%

1/16W

R703

1-216-845-11 METAL CHIP

100K

5%

1/16W

R706

1-216-845-11 METAL CHIP

100K

5%

1/16W

MAIN

Summary of Contents for Sports Walkman WM-FS421

Page 1: ... 5 mm 4 1 4 4 7 8 2 1 8 inches 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 JEITA Tape Radio playback reception Sony alkaline LR6 SG 32 40 Sony R6P SR 9 14 Measured value by the standard of JEITA Japan El...

Page 2: ...n 2 MF WMFS421 114 18 8 ELECTRICAL PPARTS LIST 19 SECTION 1 GENERAL Notes on chip component replacement Never reuse a disconnected chip component Notice that the minus side of a tantalum capacitor may be damaged by heat Flexible Circuit Board Repairing Keep the temperature of soldering iron around 270 C during repairing Do not touch the soldering iron on the same conductor of the circuit board wit...

Page 3: ... 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 4 Joint AVLS Joint VOL Knob Hold Knob Vol O Ring Apply sony grease SGL 601 O Ring Dia 2 5 Dia 4 5 Apply sony grease SGL 601 ...

Page 4: ...tch mates with the corresponding knob each other Set Main Assy Chassis Sub Assy MAIN Board and Mechanism Deck Belt Head Magnetic HP701 6 Remve the main assy in the direction of arrow Be careful not to focibly pull the wire that connects the main board and the headphone board 7 Remove the HEADPHONE borad in the direction of arrow 1 Stop ring E 1 2 5 Two screws B1 7 7 3 Screw tapping 2 Screw tapping...

Page 5: ...2 CHASSIS SUB ASSY 3 3 MAIN BOARD AND MECHANISM DECK MAIN board 1 Two claws Chassis sub assy 2 3 Screw M1 4 Toothed Lock 1 Remove the solder four points 5 Stopper L2 4 MAIN board 2 Remove the solder 6 Mechanism deck ...

Page 6: ...6 WM FS421 3 4 BELT 3 5 HEAD MAGNETIC HP701 Reel Capstan motor Capstan wheel assy SP Capstan wheel assy SP Belt threading Belt Belt 1 Two screws M1 4 2 Head magnetic HP701 ...

Page 7: ...N m More than 2 0 g cm More than 0 027 oz inch More tham 4 9 N m More than 50 g cm More than 0 69 oz inch TAPE SECTION Signal 3 kHz 0 dB Used for Tape speed adjustment Tape WS 48A Test Tape Tape Speed Adjustment Procedure Mode Playback Adjustment Value normal tape speed Adjust the tape speed adjustment RV601 so that the freqency counter reading becomes 3 000Hz Specification Value Frequency differe...

Page 8: ... AM TRACKING ADJUSTMENT Adjust for maximum reading on level meter L3 620 kHz CT1 1 400 kHz Repeat the procedures in each adjustment several times for the maximum level meter indication The frequency coverage and tracking adjustments should be finally done by the trimmer capacitors AM IF ADJUSTMENT Adjust for a maximum reading on level meter RV2 1 000 kHz FM VCO Adjustment Procedure 1 Connect the r...

Page 9: ...N BOARD Component side Conductor side CT1 AM Tracking Adjustment L4 FM Tracking Adjustment L7 AM Frequency Coverage Adjustment L3 AM Tracking Adjustment RV1 FM VCO Adjustment RV2 AM IF Adjustment TP2 FM IN TP1 TP VCO ...

Page 10: ... 1 2 TV 1 8 1 25V 18 17 16 FMBF AMLO AM OSC FM TV OSC 20 30 29 27 28 23 24 25 26 22 21 11 1 2 36 35 34 33 32 31 30 29 28 27 26 25 13 14 15 16 17 18 19 20 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 COM RI VREF POWER OUTC POWER OUT2 VCC POWER MUTE POWER IN1 POWER IN2 MIX OUT1 MIX OUT2 LP 2 R P2 R P1 DET OUT MVREF IN VSP LOW BOOST IN2 LOW BOOST IN1 LOW BOOST SW M GND R VREF PRE MUTE SW FWD REW P...

Page 11: ...EF 34 TAPE SPEED FM VCO RV601 TH601 w VOLUME RV301 i J301 16 PWOUT L 20 PWOUT R 18 PWOUT C 39 UOUT 40 VOUT 41 WOUT M601 CAPSTAN REEL B P F TVIN 24 Q3 BUFFER FM IN 56 14 BAND 13 16 12 COMP LOCAL DX NOR METAL AM IN 57 LPF OUT 61 TU VCC 54 LPF IN 60 E O 59 TUNE 11 15 SD IC702 DTS 26 MEGA BASS 20 BEEP 32 10 ALVS TAPE POWER DRY BATTRY SIZE AA IEC DESIGNATION R6 2PCS 3V S301 RIPPLE FILTER Q501 502 REG D...

Page 12: ...D 7 D404 D 7 D701 F 7 IC1 B 2 IC301 E 3 IC701 D 3 IC702 D 2 Q3 C 3 Q200 A 5 Q301 E 3 Q501 F 2 Q502 E 1 Q701 E 1 Semiconductor Location w Y HP701 0FF ON L3 AM FERRIRE ROD ANTENNA TP2 TP1 TP VCO 1 2 A B C D E F G 3 4 5 6 7 8 9 IC702 IC301 IC701 IC1 Caution Pattern face side Parts on the pattern face side seen from Side A the parts face are indicated Parts face side Parts on the parts face side seen ...

Page 13: ...designation A B Line H adjustment for repair Power voltage is dc 3 V and fed with regulated dc power supply from battery terminal Voltages are dc with respect to ground under no signal detuned conditions no mark PB FM Voltages are taken with a VOM Input impedance 10 MΩ Voltage variations may be noted due to normal produc tion tolerances Signal path F FM f AM E PB Refer to page 10 for IC Block Diag...

Page 14: ...lt POWER CHECK input HOLD Key input GND RADIO ON OFF control MEGA BASS ON OFF control Mute output TAPE input PREAMP control segment output Common output LCD power supply RESET input IF input Positive polarity Input to FM system Input to AM system GND Error output LPF input LPF output GND GND Input to crystal Pin Name XOUT TEST2 PA0 PA3 PB1 PB3 AVLS MOTOR CTL LOCAL DX NOR METAL E CA BAND SD COMP N ...

Page 15: ...o Description Remarks 1 3 224 944 01 BUCKLE 2 3 224 946 01 SHAFT BUCKLE 3 3 224 971 01 PLATE LOCK 4 3 318 203 62 SCREW B1 7X4 TAPPING 5 3 224 941 01 PACKING MD RVS 6 3 224 945 01 SHAFT ROLLER 7 3 012 927 01 RING O 8 3 224 937 01 KNOB VOL 9 3 224 938 01 KNOB HOLD 10 X 3380 327 1 CABINET REAR SUB ASSY 11 3 326 560 11 RING DIA 2 5XDIA 4 5 O 12 3 018 075 01 SPACER 13 3 318 201 51 SCREW B 1 4X4 TAPPING...

Page 16: ... B1 7 TAPPING 54 3 227 301 01 SPRING CASSETTE 55 3 224 933 01 CHASSIS 56 3 227 300 01 BUTTON REW 57 3 227 297 01 BUTTON PLAY 58 3 227 299 01 BUTTON FF 59 3 227 298 01 BUTTON STOP 60 3 224 939 01 STOPPER L2 62 3 015 285 01 SCREW M1 4 TOOTHED LOCK WH 63 A 3021 390 A MAIN BOARD COMPLETE 64 3 221 310 01 LEVER VOL B 65 3 921 878 01 TERMINAL BOARD BATTERY 66 3 224 948 01 TERMINAL BATTERY 67 3 318 201 51...

Page 17: ...ks Ref No Part No Description Remarks 201 3 938 657 01 BELT 202 3 920 997 01 SPRING PINCH R 203 X 3369 748 1 PINCH LEVER R ASSY 204 3 704 197 01 SCREW M1 4 SPECIAL HEAD 205 3 024 223 11 GEAR REEL 2 206 3 704 197 71 SCREW M1 4 207 X 3369 749 1 PINCH LEVER N ASSY HP701 1 500 648 11 HEAD MAGNETIC PLAYBACK M601 1 763 683 11 MOTOR DC REEL CAPSTAN WITH PULLEY ...

Page 18: ...3 921 797 01 WASHER 254 3 021 786 01 LEVER FS D SELECTION 255 3 921 052 11 LEVER A DETECTION 256 3 920 994 11 SPRING D SELECTION 257 X 3376 169 1 CLUTCH ASSY 258 3 929 419 01 LEVER BR DETECTION 262 3 728 091 01 WASHER STOPPER 263 3 923 530 11 SLEEVE M 264 3 921 335 01 WASHER LEVER 265 3 920 990 01 SPRING UD COMPRESSION 267 X 3372 619 1 WHEEL ASSY NP CAPSTAN 269 3 933 324 01 SPRING FR LEVER ...

Page 19: ...IP 0 001uF 10 50V C33 1 162 964 11 CERAMIC CHIP 0 001uF 10 50V C34 1 162 964 11 CERAMIC CHIP 0 001uF 10 50V C35 1 162 927 11 CERAMIC CHIP 100PF 5 50V C39 1 162 964 11 CERAMIC CHIP 0 001uF 10 50V C40 1 162 964 11 CERAMIC CHIP 0 001uF 10 50V C45 1 115 416 11 CERAMIC CHIP 0 001uF 5 00 25V C101 1 162 962 11 CERAMIC CHIP 470PF 10 50V C102 1 162 962 11 CERAMIC CHIP 470PF 10 50V C103 1 162 968 11 CERAMIC...

Page 20: ... 1 216 833 11 METAL CHIP 10K 5 1 16W R8 1 216 833 11 METAL CHIP 10K 5 1 16W R10 1 216 833 11 METAL CHIP 10K 5 1 16W R11 1 216 833 11 METAL CHIP 10K 5 1 16W R12 1 216 803 11 METAL CHIP 33 5 1 16W R13 1 216 813 11 METAL CHIP 220 5 1 16W R14 1 216 825 11 METAL CHIP 2 2K 5 1 16W R15 1 216 845 11 METAL CHIP 100K 5 1 16W R17 1 216 833 11 METAL CHIP 10K 5 1 16W R18 1 216 845 11 METAL CHIP 100K 5 1 16W R1...

Page 21: ...ETAL CHIP 100K 5 1 16W VARIABLE RESISTOR RV1 1 223 258 11 RES CARBON ADJ VAR 4 7K RV2 1 223 278 11 RES CARBON ADJ VAR 100K RV301 1 225 184 11 RES VAR CARBON 10K 10K wVOLUME RV601 1 241 916 11 RES ADJ CARBON 4 7K TAPE SPEED SWITCH S301 1 771 040 21 SWITCH PUSH TAPE POWER S302 1 771 040 21 SWITCH PUSH Y S701 1 771 586 41 SWITCH SLIDE HOLD OFF ON THERMISTOR TH601 1 803 751 21 THERMISTOR POSITIVE VIBR...

Page 22: ...TORY 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 1 0 2001 04 New ...

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