Sony Walkman WM-GX221 Service Manual Download Page 3 | Manualshive

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WM-GX221

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.

– MAIN BOARD (SIDE A) —

S704

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Summary of Contents for Walkman WM-GX221

Page 1: ... Ω Power requirements 3 V DC batteries R6 size AA 2 External DC 3V power sources Dimensions w h d Approx 112 0 82 5 38 0 mm 4 1 2 3 1 4 1 1 2 inches excl projecting parts and controls Mass Approx 190 g 6 8oz main unit only Supplied accessories Stereo headphones or earphones 1 Stereo microphone 1 Carrying case 1 Design and specifications are subject to change without notice Battery life Approx hour...

Page 2: ...ering 1 SERVICE NOTE 3 2 GENERAL 4 3 DISASSEMBLY 5 3 1 Panel Cabinet Front Cabinet Front Assy 5 3 2 MAIN Board Mechanism Deck MT WMGX221 175 6 3 3 HE901 HRP901 M601 Belts 7 3 4 SUB Board 7 4 MECHANICAL ADJUSTMENT 8 5 ELECTRICAL ADJUSTMENT 8 6 DIAGRAMS 10 6 1 Block Diagram Tuner Section 11 6 2 Block Diagram Main Section 12 6 3 Printed Wiring Boards 13 6 4 Schematic Diagram MAIN Board 1 2 14 6 5 Sch...

Page 3: ...g 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 MAIN BOARD SIDE A S704 ...

Page 4: ... turn up the volume The button jack has a tactile dot PAUSE z REC FLUNCTION TAPE RADIO NORM CrO2 METAL FM ST MONO DX LOCAL ISS Built in microphone DC IN 3V SPEAKER i i x STOP NPLAY VOL BAND FM AM SOUND BOOST OFF ON TUNING REC BATT indicator Tuning indicator MIC PLUG IN POWER 2x REC TIME NORM DOUBLE AVLS NORM LIMIT mREW REVIEW MFF CUE LOCATION OF CONTROLS ...

Page 5: ...Y two screws B1 7 1 4 1 2 screw B1 7 1 4 1 two screws B1 7 1 4 3 two screws 3 screw 3 screw B1 7 1 4 1 two screws B1 7 9 3 Remove solder two places 6 Remove solder two places 6 cabinet front assy panel cabinet front four claws 4 claw 4 two claws 4 flexible board 5 cabinet center Panel cabinet front Cabinet front assy MAIN board Mechanism deck MT WMGX221 175 HE901 HRP901 M601 Belts SUB board Set ...

Page 6: ...ws 5 joint cover 7 three screws B1 7 9 3 spring torsion 2 cassette holder sub assy Remove solder four places 8 MT WMGX221 175 cabinet center 1 4 Caution of the pointer attachment The pointer is slid even a stopper is brougth near and CV1 is turned with all its might clockwise and is attached ...

Page 7: ...1 7 1 SUB board 2 cabinet front assy panel MIC two screws M1 4 2 M601 capstan reel motor 3 1 7 6 capstan fly assy AR washer 5 washer 6 9 qa 8 washer stopper N two screws HE901 erase head 0screw HRP901 REC PB head Attaching belt CAP and belt pulley belt CAP belt CAP z ...

Page 8: ...rd see page 9 PRECAUTION 1 Clean the following parts with a denatured alcohol moistened swab record playback erase head pinch roller rubber belts capstan 2 Demagnetize the record playback head with a head demagnet izer Do not bring a head demagnetizer close to the erase head 3 Do not use a magnetized screwdriver for the adjustments 4 The adjustments should be performed with the rated power supply ...

Page 9: ...Hz 108 25 MHz EA MODEL no mark OTHER MODELS Repeat the procedures in each adjustment several times AM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L1 620 kHz CT1 1 1 400 kHz MAIN BOARD SIDE B Adjustment Parts Location MAIN BOARD SIDE A FM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L2 86 0 MHz 87 35 MHz CT1 2 109 5 MHz 108 25 MHz EA MODEL no mark OTHER MODELS...

Page 10: ...ns may be noted due to normal production toler ances Waveforms are taken with a oscilloscope Voltage variations may be noted due to normal production toler ances Circled numbers refer to waveforms Signal path F FM f AM E PB d REC N MIC INPUT Abbreviation 5E E model with the indication of the country of origin 9E E model without the indication of the country of origin CH Chinese model CND Canadian ...

Page 11: ... AM OSC L1 AM FERRITE BAR ANTENNA FM RF OUT AM RF IN L2 FM RF FM AM RF AMP FM AM MIX AMP FM AM OSC FM AM IF AMP DET MPX IC1 CT1 2 CV1 2 CV1 TUNING CT1 1 CV1 1 L3 FM OSC CT1 3 CV1 3 L4 AM OSC CT1 4 CV1 4 CT1 3 L3 FM FREQUENCY COVERAGE CT1 4 L4 AM FREQUENCY COVERAGE CT1 1 L1 AM TRACKING CT1 2 L2 FM TRACKING T1 AM IF B P F CP1 ANT A TU L TU R B 11 ST LED AGC TUN LED ST LED DET OUT AF AMP MPX IN QUAD ...

Page 12: ...RV301 VOL SWITCH Q552 PB OUT R REC OUT R 9 3 EQ AMP POWER AMP POWER AMP POWER AMP MODE CONTROL CIRCUIT PB AMP REC AMP 11 12 PW SW REC SW R CH S301 1 4 S301 2 4 REC PB REC PB REC PB REC PB REC PB S301 4 4 REC PB S701 2 2 S701 1 2 REC PB S301 3 4 REC PB NORM LIMIT CrO2 METAL NORM S1 2 2 OFF ON OFF ON SOUND BOOST S303 NORM DOUBLE 2X REC TIME S601 AVLS S304 PAUSE S702 PRE OUT R FWDIN R REVIN R VREF VR...

Page 13: ...10 11 12 13 Semiconductor Location Ref No Location D1 B 4 D401 C 12 D701 C 7 IC1 F 3 IC151 D 8 IC301 C 2 IC501 E 9 Q152 B 7 Q252 B 7 Q301 D 2 Q302 B 3 Q401 A 1 Q402 A 2 Q403 A 1 Q452 E 9 Q453 E 8 Q501 E 1 Ref No Location Q502 E 1 Q551 F 1 Q552 E 1 Q553 E 1 Q601 B 1 Q602 B 2 Q701 D 1 Q702 C 8 Q703 D 1 Q704 C 7 Q705 B 3 Q707 B 7 Q708 B 6 Q710 D 1 Q711 D 2 Q712 E 6 Q713 E 4 Q715 E 1 Q716 B 6 Ver 1 2 ...

Page 14: ...14 14 WM GX221 6 4 SCHEMATIC DIAGRAM MAIN BOARD 1 2 IC B D DOUBLE DOUBLE 3 3k 47 0 022 220p 470p US CND EA 5E Refer to page 10 for Waveforms Refer to page 16 for IC Block Diagram Ver 1 2 ...

Page 15: ... B D IC B D IC B D 10 7MHz 10 7MHz 2200p 2200p 47k 1k 0 1 0 1 US CND 5E EXCEPT US CND 5E US CND EXCEPT US CND EA EXCEPT US CND 5E US CND EA 5E US CND 5E EXCEPT US CND 5E US CND EA 5E US CND 5E EXCEPTUS CND 5E Refer to page 16 for IC Block Diagrams Ver 1 2 ...

Page 16: ...0 21 22 23 24 48 47 46 45 44 43 42 41 40 39 38 37 COM RI VREF POWER OUT COM POWER OUT R VCC POWER MUTE POWER IN L POWER IN R MIX OUT L MIX OUT R LP 2 H PIN R H PIN L DET OUT M VREF IN VSP MIX IN R MIX IN L L B SW M GND R P VREF SYSTEM POWER OUT L POWER GND M VCC DR WOUT MPGND VOUT UOUT FC OUT OSC UB VB WB 3 4 5 6 7 8 9 10 11 12 PRE NF L PRE OUT R PRE NF R FWDIN R REVIN R REVIN L FWDIN L S S PRE GN...

Page 17: ...667 A MAIN BOARD COMPLETE E 9E CH TW 7 A 3021 668 A MAIN BOARD COMPLETE 5E 8 3 234 570 01 BUTTON REW 9 3 234 569 01 BUTTON FF 10 3 234 568 01 BUTTON PLAY 11 3 235 589 01 BUTTON STOP 12 3 235 588 01 BUTTON REC 14 3 237 121 01 CABINET CENTER EA 9E CH TW 14 3 237 121 11 CABINET CENTER US CND 5E 16 X 3381 403 4 HOLDER SUB ASSY CASSETTE EXCEPT 9E 16 X 3381 416 1 HOLDER SUB ASSY CASSETTE 9E 17 3 237 140...

Page 18: ...683 530 11 SUB BOARD 58 1 823 584 11 CABLE FLEXIBLE FLAT 6 CORE 59 3 237 128 01 CUSHION MIC 60 3 239 558 01 SPRING GROUND 61 3 237 125 01 LID BATTERY CASE 62 3 237 129 01 KNOB SP HP 63 3 237 126 01 LENS 64 3 237 151 01 PANEL MIC 65 3 237 127 01 KNOB TAPE SPEED 66 1 542 481 11 MICROPHONE ELECTRET CAP 67 3 034 792 01 SCREW TAPPING B2 0 68 3 318 382 41 SCREW 1 7 TAPPING MIC501 1 542 307 11 MICROPHONE...

Page 19: ...7 3 029 275 01 WASHER STOPPER N 108 3 703 816 73 SCREW M1 4 SPECIAL HEAD 109 3 234 861 01 GUIDE ARO TAPE 110 3 019 776 01 GEAR REEL S 111 3 703 816 24 SCREW M1 4X2 5 SPECIAL HEAD 112 X 3379 882 1 PINCH N ASSY ARM 113 3 703 925 21 SCREW M1 4 M601 1 763 772 11 MOTOR DC CAPSTAN REEL HE901 1 500 232 11 HEAD MAGNETIC ERASE HRP901 1 500 718 11 HEAD MAGNETIC REC PB A Included in Ref No 151 HRP901 HE901 M...

Page 20: ...OMPRESSION 154 3 019 778 01 SLEEVE MS 155 3 728 091 01 WASHER STOPPER 156 3 225 427 01 WASHER LEVER 157 3 225 384 01 GEAR A 159 3 225 395 01 LEVER REW ROTARY 160 X 3380 677 1 LEVER E DETECTION ASSY 161 3 229 064 01 WASHER STOPPER 162 3 225 393 01 LEVER SHUT OFF 164 3 321 813 71 WASHER COTTER POLYETHYLENE 165 X 3379 881 1 CLUTCH ASSY AR 166 3 315 384 31 WASHER STOPPER 169 3 225 388 01 GEAR D 170 3 ...

Page 21: ...MIC CHIP 2PF 0 25PF 50V EA C18 1 162 905 11 CERAMIC CHIP 1PF 0 25PF 50V US CND C18 1 162 908 11 CERAMIC CHIP 3PF 0 25PF 50V EXCEPT US CND EA C21 1 162 964 11 CERAMIC CHIP 0 001uF 10 50V C22 1 115 156 11 CERAMIC CHIP 1uF 10V C23 1 164 156 11 CERAMIC CHIP 0 1uF 25V C24 1 164 227 11 CERAMIC CHIP 0 022uF 10 25V US CND 5E C24 1 162 970 11 CERAMIC CHIP 0 01uF 10 25V EXCEPT US CND 5E C25 1 164 227 11 CER...

Page 22: ...C521 1 162 962 11 CERAMIC CHIP 470PF 10 50V C522 1 164 505 11 CERAMIC CHIP 2 2uF 16V C523 1 162 962 11 CERAMIC CHIP 470PF 10 50V C551 1 162 970 11 CERAMIC CHIP 0 01uF 10 25V C552 1 164 315 11 CERAMIC CHIP 470PF 10 50V C553 1 164 230 11 CERAMIC CHIP 220PF 10 50V C554 1 162 970 11 CERAMIC CHIP 0 01uF 10 25V C555 1 162 966 11 CERAMIC CHIP 0 0022uF 10 50V C556 1 137 934 11 TANTAL CHIP 47uF 20 10V C557...

Page 23: ...L CHIP 0 5 1 16W R109 1 216 864 11 METAL CHIP 0 5 1 16W US CND R109 1 216 797 11 METAL CHIP 10 5 1 16W EXCEPT US CND R110 1 216 821 11 METAL CHIP 1K 5 1 16W R151 1 216 833 11 METAL CHIP 10K 5 1 16W R152 1 216 851 11 METAL CHIP 330K 5 1 16W R153 1 216 845 11 METAL CHIP 100K 5 1 16W US CND EA 5E R153 1 216 854 11 METAL CHIP 560K 5 1 16W E 9E CH TW R154 1 216 833 11 METAL CHIP 10K 5 1 16W R155 1 216 ...

Page 24: ... 100 5 1 16W R612 1 216 809 11 METAL CHIP 100 5 1 16W R703 1 216 864 11 METAL CHIP 0 5 1 16W R711 1 216 833 11 METAL CHIP 10K 5 1 16W R712 1 216 833 11 METAL CHIP 10K 5 1 16W R713 1 216 813 11 METAL CHIP 220 5 1 16W R716 1 216 833 11 METAL CHIP 10K 5 1 16W R717 1 216 864 11 METAL CHIP 0 5 1 16W R718 1 216 833 11 METAL CHIP 10K 5 1 16W R719 1 216 841 11 METAL CHIP 47K 5 1 16W R720 1 216 833 11 META...

Page 25: ...UAL INSTRUCTION ENGLISH ARABIC EA 3 238 369 21 MANUAL INSTRUCTION ENGLISH CHINESE KOREAN E 3 238 369 31 MANUAL INSTRUCTION ENGLISH CHINESE KOREAN 9E 3 238 369 44 MANUAL INSTRUCTION ENGLISH CHINESE US CH TW 3 238 369 51 MANUAL INSTRUCTION ENGLISH SPANISH PORTUGUESE 5E 3 238 369 61 MANUAL INSTRUCTION ENGLISH FRENCH CND 8 954 008 93 RECEIVER EAR MDR E808LP Ver 1 2 ...

Page 26: ...ump 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 11 New 1 1 2002 06 Addition of Taiwan model ENG 02023 1 2 2004 04 Addition of Canadian model ...

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