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Sony Walkman WM-EX921, Service Manual

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Sony Walkman WM-EX921 Service Manual Download Page 4

4

WM-EX921

Slider (NRA)

Rotation system

Rotation system during PLAY.

Rotation system during FF.

Rotation system during REW.

slider (NRA)

side F side R

center

insert flywheel (N)

insert flywheel (R)

reverse pulley

clutch assy (F)

gear (Y)

cam gear

gear (REEL) (side T)

motor pulley

idler gear (A) (side T)

gear (FR)
 (FF: left side)

insert flywheel (N)

insert flywheel (R)

reverse pulley

clutch assy (F)

idler gear (B)

gear (Y)

cam gear

gear (REEL) (side T)

gear (REEL) (side S)

motor pulley

idler gear (A) (side T)

idler gear (A) (side S)

gear (NR)
 (FWD : left side/

REV : right side)

insert flywheel (N)

insert flywheel (R)

reverse pulley

clutch assy (F)

gear (Y)

cam gear

gear (REEL) 
(side S)

motor pulley

idler gear (A) 
(side S)

gear (FR)
(REW: right side)

Summary of Contents for Walkman WM-EX921

Page 1: ...x hours in playback JEITA Rechargeable NH 14WM A 45 fully charged Measured value by the standard of JEITA Japan Electronics and Information Technology Industries Association Using a Sony HF series cassette tape Note The battery life may be shorter depending on the operating condition and the surrounding temperature Ver 1 0 2001 10 9 873 307 01 Sony Corporation 2001J0500 1 Personal Audio Company C ...

Page 2: ... board within 3 times Be careful not to apply force on the conductor when soldering or unsoldering SAFETY RELATED COMPONENT WARNING COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB LISHED BY SONY No...

Page 3: ...et state as follow 2 Move the DIRECTION switch S702 to the side which the slider NRA is facing 3 The slider NRA will move when the regulated power supply switch is set to OFF once and then set to ON Move the DI RECTION switch S702 according to this timing and set to the center position 3 FF REW modes 1 Check that the preset state is set 2 Input the square wave or sine wave to the TP31 PH S and the...

Page 4: ... REEL side T motor pulley idler gear A side T gear FR FF left side insert flywheel N insert flywheel R reverse pulley clutch assy F idler gear B gear Y cam gear gear REEL side T gear REEL side S motor pulley idler gear A side T idler gear A side S gear NR FWD left side REV right side insert flywheel N insert flywheel R reverse pulley clutch assy F gear Y cam gear gear REEL side S motor pulley idle...

Page 5: ...epeat single track function On the remote control Press Y x twice during playback REP lights up On the main unit Press the jog lever twice during playback To stop a single repeat Press Y x or the jog lever once Fast forward rewind while listening to the sound CUE REVIEW On the remote control Press and hold FF REW during playback and release it at the point you want On the main unit Move and hold t...

Page 6: ... Pinch Set 3 2 Case Section 3 3 Main Board 3 8 Holder FA Assy 3 10 Head Magnetic Playback HP901 3 4 Belt F0 3 5 Motor DC Capstan Reel M601 3 7 Ornament Open Block Assy 3 6 Lid Assy Cassette 4 Close terminal board assy 5 two screws M1 4 6 screw M1 4 2 claw 1 Open lid battery case 3 lid battery case 7 case section 5 two screws M1 4 knob VOL S301 cassette assy lid Note On installation lid assy casset...

Page 7: ...Remove seven solders of motor DC M601 1 Remove two solders of solenoid plunger 1 Remove four solders of switch leaf S704 slider S702 Note On installation MAIN board adjust the S702 and slider 2 terminal board battery 1 Remove solder of terminal board battery 3 belt F0 pulley motor pulley reverse flywheel R insert belt F0 flywheel N insert ...

Page 8: ...8 WM EX921 3 5 MOTOR DC CAPSTAN REEL M601 3 6 LID ASSY CASSETTE 2 motor DC capstan reel M601 1 two screws M1 4 4 lid assy cassette 2 two screws M1 4 2 screw M1 4 3 boss 1 Open lid assy cassette ...

Page 9: ... 8 HOLDER FA ASSY 2 claw 4 two claws 5 ornament open block assy 3 boss 1 1 7 bracket cassette 910 assy 2 boss 6 boss 3 lever B M lock 5 lever S M lock 1 two screws M1 4 4 screws M1 4 8 Remove six solders of head flexible board 9 holder FA assy ...

Page 10: ...SY PINCH 3 10 HEAD MAGNETIC PLAYBACK HP901 1 claw 3 claw 2 Remove lever R2 assy pinch in the direction of the arrow 4 Remove lever N2 assy pinch in the direction of the arrow holder FA assy 4 head magnetic playback HP901 1 spring HDA 3 two bosses 2 ...

Page 11: ... 2 0 g cm Back Tension 0 004 0 01 oz inch more than 3 43 mN m FF REW CQ 201B more than 35 g cm more than 0 5 oz inch SECTION 4 MECHANICAL ADJUSTMENTS SECTION 5 ELECTRICAL ADJUSTMENTS Precaution 1 Specified voltage 1 3 V DC 2 Switch position VOL AVLS switch Center NOR 3 Remote control setting HOLD switch OFF VOL knob MAX DOLBY NR OFF SOUND mode Normal 0 dB 0 775 V Test tape Type Signal Used for WS ...

Page 12: ...12 WM EX921 MEMO ...

Page 13: ...UDIO MASTER AMP IC301 2 2 RF OUT BASE VCC J301 6 16 28 29 X701 32 768kHz PLUNGER DRIVE Q701 PM701 PLUNGER PM CTL DC DC CONVERTER IC701 BATT B RESET SIGNAL GENERATOR IC704 35 15 11 DDC B DDC B ROTATION DETECT SENSOR S REEL PH701 19 CAPSTAN REEL MOTOR SERVO IC601 DECODER SOFT CLIP 13 32 31 35 36 1 28 29 30 P SIG ENCODER COMPARATOR PULSE t BUFFER COMPARATOR 14 15 17 CAPSTAN REEL MOTOR START SWITCH Q6...

Page 14: ... Ω and 1 4 W or less unless otherwise specified indicates tolerance C panel designation A B Line H adjustment for repair Power voltage is dc 1 3V and fed with regulated dc power supply from battery terminal Voltages and waveforms are dc with respect to ground in playback mode no mark PLAYBACK DOLBY NR ON Voltages are taken with aVOM Input impedance 10 MΩ Voltage variations may be noted due to norm...

Page 15: ...RE NF B 11 AMS IN 12 IN B R 4 IN B F 2 IN A F 1 21 20 19 18 17 GND 16 AMS DET 15 AMS MIX 14 AMS SW 13 22 23 24 38 C AMP SW 37 PW SW 42 MT SW 41 F R SW 44 BST SW 43 M N SW 46 PRE GND 47 VREF IN 48 PRE SW 45 AMS OUT 40 BEEP 39 26 27 28 29 30 31 32 33 34 DET 36 AGC IN 35 EQ B 25 RIPPLE FILTER AGC DET BEEP VREF SWITCH COMPARATOR MTL DRV IC303 NJM2185AV TE2 IC601 LB1994M TLM DECODER CTRL BLOCK POWER D ...

Page 16: ...LEVER REW PUSH bB x FF HEADPHONE WITH REMOTE CONTROL X701 1 1 3 4 6 6 4 3 12 13 1 25 36 24 48 37 4 3 1 2 1 3 5 4 1 9 19 27 28 36 10 18 MAIN BOARD COMPONENT SIDE 6 3 PRINTED WIRING BOARD MAIN Board Component Side Uses unleaded solder Semiconductor Location Ref No Location D701 F 3 D702 B 6 IC301 B 2 IC303 E 3 IC601 D 7 IC701 B 6 IC704 E 4 IC705 D 4 PH701 D 6 Q305 B 2 Q309 C 2 Q311 E 2 Q315 D 3 Q316...

Page 17: ...0mAh CHASSIS S704 1 2 TAPE DETECT S704 2 2 ATS 1 682 489 11 11 1 2 3 4 5 6 7 A B C D E F CHARGING STAND DC IN 4 5V TP10 GND TP31 PH S 1 1 2 2 5 3 5 3 1 S704 1 5 3 2 MAIN BOARD CONDUCTOR SIDE EXCEPT FR FR FR 6 4 PRINTED WIRING BOARD MAIN Board Conductor Side Uses unleaded solder Semiconductor Location Ref No Location Q302 C 5 Q304 D 6 Q306 B 7 Q312 F 7 Q314 F 7 Q317 E 7 ...

Page 18: ...EMATIC DIAGRAM MAIN Board 1 2 See page 14 for Waveforms See page 15 for IC Block Diagrams The components identified by mark 0 or dotted line with mark 0 are critical for safety Replace only with part number specified Page 19 ...

Page 19: ...19 19 6 6 SCHEMATIC DIAGRAM MAIN Board 2 2 See page 15 for IC Block Diagrams The components identified by mark 0 or dotted line with mark 0 are critical for safety Replace only with part number specified Page 18 ...

Page 20: ... motor rotation detect circuit L rotation detect circuit on 20 DOLBY CTL O Power on off control signal output to the Dolby NR circuit L Dolby NR on 21 VDD1 Power supply terminal 2 5V for external interface 22 VSS Ground terminal 23 VDD Power supply terminal 1 5V 24 VDDH Power supply terminal 2 5V for back up boost 25 26 CB1 CB2 Connected to capacitor for the boost power supply 27 VDDL Power supply...

Page 21: ...el FR French model JE Tourist model KR Korean model main board section case section 4 3 4 4 4 5 2 7 6 1 Ref No Part No Description Remark Ref No Part No Description Remark 1 3 233 770 01 LID BATTERY CASE SILVER 1 3 233 770 11 LID BATTERY CASE BLUE 1 3 233 770 21 LID BATTERY CASE RED 2 3 029 220 11 SPRING TENSION 3 X 3380 991 1 LID ASSY CASSETTE SILVER EXCEPT KR 3 X 3380 992 1 LID ASSY CASSETTE BLU...

Page 22: ... SHUTTER A 55 3 233 768 01 SPRING SHUTTER 56 3 233 764 01 BASE SHUTTER 57 3 233 761 01 CASE SILVER 57 3 233 761 11 CASE BLUE 57 3 233 761 21 CASE RED 58 3 704 197 32 SCREW M1 4X3 0 59 3 233 773 01 KNOB VOL SILVER 59 3 233 773 11 KNOB VOL BLUE 59 3 233 773 21 KNOB VOL RED 60 3 233 769 01 ORNAMENT CASE 61 3 235 965 01 CASE WINDOW not supplied 51 52 53 52 57 58 58 59 60 54 55 56 61 ...

Page 23: ...SY M 109 3 225 996 02 SCREW M1 4 EG PRECISION PAN 110 3 236 616 01 COVER MD JE 110 3 236 616 11 COVER MD AEP EE FR 110 3 236 616 21 COVER MD CH KR 111 3 365 630 41 SCREW M1 4 112 X 3379 431 1 BRACKET CASSETTE 910 ASSY 113 3 038 054 01 LEVER B M LOCK 114 3 704 197 01 SCREW M1 4 SPECIAL HEAD 115 3 029 213 01 TERMINAL BOARD BATTERY 116 3 345 648 71 SCREW M1 4 TOOTHED LOCK 117 X 3377 726 2 TERMINAL BO...

Page 24: ... WASHER 155 3 029 282 12 GEAR Y 156 3 029 285 02 GEAR CAM 157 3 029 284 13 LEVER TRIGGER 158 3 010 273 02 GEAR REEL 159 3 029 281 01 GEAR IDLER B 160 3 040 897 04 SPRING TGA TORSION 161 3 029 273 01 GEAR FR 162 3 007 433 12 SHEET N REFLECTION 163 3 029 283 02 GEAR IDLER A 164 3 029 286 01 GEAR NR PM701 1 454 674 32 SOLENOID PLUNGER PM701 154 153 160 162 162 151 151 152 152 155 156 157 159 158 158 ...

Page 25: ... 01 WASHER 205 3 386 694 01 WASHER 206 3 029 306 21 FLYWHEEL N INSERT 207 3 221 357 01 BELT F0 208 3 007 428 01 WASHER R 209 3 029 268 21 FLYWHEEL R INSERT 210 3 029 765 01 SCREW M1 4 TOOTHED LOCK 211 3 029 883 01 RETAINER F1 MOTOR 212 X 3377 584 5 CHASSIS ASSY FA 213 3 029 288 01 PULLEY REVERSE M601 1 763 559 12 MOTOR DC CAPSTAN REEL WITH PULLEY 206 M601 205 208 209 210 211 202 212 213 201 204 20...

Page 26: ...cription Remark Ref No Part No Description Remark 251 X 3377 589 1 HOLDER FA ASSY 252 3 033 757 01 SHEET H 253 X 3377 994 2 LEVER N2 ASSY PINCH 254 3 046 789 01 SPRING HDA 255 X 3377 995 2 LEVER R2 ASSY PINCH HP901 1 500 639 22 HEAD MAGNETIC PLAYBACK HP901 253 251 254 255 252 ...

Page 27: ...dized parts so they may have some difference from the original one RESISTORS All resistors are in ohms METAL Metal film resistor METAL OXIDE Metal oxide film resistor F nonflammable Items marked are not stocked since they are seldom required for routine service Some delay should be anticipated when order ing these items SEMICONDUCTORS In each case u µ for example uA µA uPA µPA uPB µPB uPC µPC uPD ...

Page 28: ...218 973 11 RES CHIP 47K 5 1 16W R117 1 208 675 11 METAL CHIP 470 0 5 1 16W R150 1 218 941 11 RES CHIP 100 5 1 16W FR R201 1 218 967 11 RES CHIP 15K 5 1 16W R202 1 218 943 11 RES CHIP 150 5 1 16W R203 1 218 977 11 RES CHIP 100K 5 1 16W R204 1 218 963 11 RES CHIP 6 8K 5 1 16W R205 1 218 963 11 RES CHIP 6 8K 5 1 16W R207 1 218 953 11 RES CHIP 1K 5 1 16W R208 1 218 969 11 RES CHIP 22K 5 1 16W R209 1 2...

Page 29: ...11 METAL CHIP 470K 0 5 1 16W R735 1 208 943 11 METAL CHIP 220K 0 5 1 16W R736 1 208 935 11 METAL CHIP 100K 0 5 1 16W R737 1 208 935 11 METAL CHIP 100K 0 5 1 16W VARIABLE RESISTOR RV601 1 223 325 21 RES ADJ METAL GLAZE 100K SWITCH S301 1 692 605 11 SWITCH SLIDE VOL AVLS S702 1 771 475 21 SWITCH SLIDE DIRECTION S703 1 771 816 21 SWITCH LEVER SLIDE JOG LEVER VIBRATOR X701 1 767 386 21 VIBRATOR CRYSTA...

Page 30: ...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 10 New ...

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