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WM-EX170/EX172

Canadian Model

WM-EX170

AEP Model

E Model

WM-EX170/172

SERVICE MANUAL

CASSETTE PLAYER

MICROFILM

SPECIFICATIONS

Model Name Using Similar Mechanism

NEW

Tape Transport Mechanism Type

MT-WMEX170-114

Manufactured under license from Dolby Laboratories
Licensing Corporation.
“DOLBY” and the double-D symbol 

a

 are trademarks

of Dolby Laboratories Licensing Corporation.

• Power requirements

3V DC batteries R6 (AA) 

×

 2 / External DC 3V power sources

• Dimensions

88.5 

×

 111.5 

×

 37.6 mm

(3 

1

/

2

 

×

 4 

1

/

2

 

×

 1 

1

/

2

 inches) (w / h/ d) incl. projecting parts and controls

• Mass

EX170 : Approx. 125 g (4.5 oz) / Approx. 185 g (6.6 oz) incl.

batteries and a cassette

EX172 : Approx. 130 g (4.6 oz) / Approx. 190g (6.8 oz) incl.
   batteries and a cassette

• Supplied accessories

Stereo headphones or Stereo earphones (1) / Belt clip (1)

Design and specifications are subject to change without notice.

Photo : WM-EX172

Summary of Contents for Walkman WM-EX170

Page 1: ...marks of Dolby Laboratories Licensing Corporation Power requirements 3V DC batteries R6 AA 2 External DC 3V power sources Dimensions 88 5 111 5 37 6 mm 3 1 2 4 1 2 1 1 2 inches w h d incl projecting parts and controls Mass EX170 Approx 125 g 4 5 oz Approx 185 g 6 6 oz incl batteries and a cassette EX172 Approx 130 g 4 6 oz Approx 190g 6 8 oz incl batteries and a cassette Supplied accessories Stere...

Page 2: ...ION 1 GENERAL 1 GENERAL 2 2 DISASSEMBLY 2 1 Cabinet Front Assy 3 2 2 Main Board 4 2 3 Cassette Lid 4 2 4 Mechanism Deck 5 2 5 Belt Motor Reel Capstan 5 3 MECHANICAL ADJUSTMENT 6 4 ELECTRICAL ADJUSTMENT 6 5 DIAGRAMS 5 1 Block Diagram 7 5 2 Printed Wiring Board EX170 Model 9 5 3 Schematic Diagram EX170 Model 11 5 4 Printed Wiring Board EX172 Model 13 5 5 Schematic Diagram EX172 Model 15 5 6 IC Block...

Page 3: ...NET FRONT ASSY 2 Insert the precision screwdriver 1 4 mm flat blade into the slit at claw A and release the claw 3 Remove the cabinet front assy Release all claws B to L in alphabetical order This set can be disassembled in the order shown below 2 1 CABINET FRONT ASSY 2 2 MAIN BOARD 2 3 CASSETTE LID 2 4 MECHANISM DECK 2 5 BELT MOTOR REEL CAPSTAN B L K C D E F G H I J ...

Page 4: ...ASSETTE LID 2 Insert a precision screwdriver 1 4 mm flat blade vertically into portion A to release the hinge plate 3 Portion B to release the hinge plate 1 Head flexible board CN301 5 Two claws 6 MAIN board 3 Remove the four solders 4 Screw M1 4 toothed lock WH 2 Flexible board CN302 ...

Page 5: ...ial head 3 Motor reel capstan 1 Belt 2 4 MECHANISM DECK 2 5 BELT MOTOR REEL CAPSTAN 1 Insert the precision screwdriver 1 4 mm flat blabe in to the slit and release two claws 2 Remove the mechanism deck in the direction of the arrow ...

Page 6: ...V REV Back Tension FF REW Torqu meter CQ 102C CQ 102RC CQ 201B Meter reading 20 30 g cm 0 4 2 0 g cm 20 30 g cm 0 4 2 0 g cm More than 40 g cm PRECAUTION 1 Specified voltage 3 0V 2 Switch position DOLBY NR switch OFF EX172 MODEL AVLS switch NORM CASSETTESECTION Test Tape Tape Speed Adjustmnet Procedure 1 Playback WS 48A Tape center part and adjust RV601 so that the frequency counter reading become...

Page 7: ... 22 3 7 RV601 TAPE SPEED S303 NORM VREF PRE OUT2 L MIX IN 2L MIX OUT L MIX OUT R PWR IN2 L PWR IN1 R HP IN 2L MIX IN 1R HP IN 1R PRE OUT1 R VREF 25 6 RV351 HIGH RV352 LOW S351 MEGA BASS OFF ON 14 VREF VREF S352 DOLBY NR ON OFF S351 MEGA BASS OFF ON VREF M B ON OFF LOW BOOST GAIN COM VCC AVLS PWR OUT 1 R PWR OUT 2 L MEGA BASS UNIT MEGA BASS UNIT EX170 MODEL EX172 MODEL 26 TAPE SELECTOR CrO2 METAL E...

Page 8: ...es seeing The other layers patterns are not indicated Abbreviation CND Canadian EE East European FR French 9E Country of origin is not shown 1 6 MEGA BASS UNIT OFF ON 4 6 2 DC IN 3V BLK ORG RED WHT BLK ORG RED WHT M901 REEL CAPSTAN MOTOR DRY BATTERY SIZE AA IEC DESIGNATION R6 2PCS 3V MAIN BOARD AVLS NORM LIMIT J302 NORM CrO2 METAL BATT RV301 VOLUME S302 POWER L R 4 5 3 2 1 6 PLAY BACK HEAD HP901 1...

Page 9: ...ation U B Line H adjustment for repair Total current is measured with no cassette installed Power voltage is dc V and fed with regulated dc power supply from external power voltage jack Voltages and waveforms are dc with respect to ground under no signal detuned conditions no mark PLAY Voltages are taken with a VOM Input impedance 10 MΩ Voltage variations may be noted due to normal produc tion tol...

Page 10: ... VOLUME L R NORM CrO2 METAL S302 POWER L R 4 5 3 2 1 1 6 1 667 711 11 16 11 1 9 5 MEGA BASS UNIT RV352 LOW RV351 HIGH OFF ON ON OFF 7 6 8 5 4 3 9 1 2 S351 MEGA BASS S352 DOLBY NR PLAY BACK HEAD HP901 5 9 10 19 18 15 27 28 36 30 25 E 6E 9E MODEL EXCEPT E 6E 9E Note on Printed Wiring Board X parts extracted from the component side b Pattern from the side which enables seeing The other layers pattern...

Page 11: ... H adjustment for repair Total current is measured with no cassette installed Power voltage is dc V and fed with regulated dc power supply from external power voltage jack Voltages and waveforms are dc with respect to ground under no signal detuned conditions no mark PLAY Voltages are taken with a VOM Input impedance 10 MΩ Voltage variations may be noted due to normal produc tion tolerances Signal...

Page 12: ...0 11 14 IC331 NJM2185V IC601 LB1979V 20 19 18 17 16 15 14 13 12 11 1 2 3 4 5 6 7 8 9 10 CURRENT DETECT OUTPUT PRE DRIVER MIX WAVEFORM DETECT CURRENT MOTIVE LOGIC SOFT SW REFERENCE VOLTAGE FOR SPEED CONTROL MOTIVE POWER DETECT POWER SUPPLY BIAS REFERENCE VOLTAGE OSCILLATOR CIRCUIT SPEED DETECT FC GND FC RI OUT VSP IN VREF S S COM OSC WB VCC NC U OUT V OUT W OUT P GND VB UB GND ...

Page 13: ...50 51 CABINET FRONT BLACK SILVER EX170 E 9E EX172 E 6E 9E 3 3 019 850 61 CABINET FRONT BLUE EX172 E 9E 3 3 019 850 71 CABINET FRONT GREEN EX172 E 9E 3 3 019 850 81 CABINET FRONT RED EX172 E 9E 4 3 019 939 01 SPRING CASSETTE HOLDER 5 3 019 949 01 SPRING TORSION 6 3 019 847 01 HOLDER CASSETTE BLACK EX170 6 3 019 847 11 HOLDER CASSETTE BLUE EX170 CND AEP EE E 9E 7 9 8 15 16 6 5 4 10 11 12 3 MT WMEX17...

Page 14: ...52 A 3021 041 A MAIN BOARD COMPLETE EX172 FR 52 A 3021 039 A MAIN BOARD COMPLETE EX172 AEP EE 52 A 3021 031 A MAIN BOARD COMPLETE EX170 FR 54 55 56 57 MT WMEX170 114 58 53 52 51 Ref No Part No Description Remarks Ref No Part No Description Remarks 53 3 019 950 01 TERMINAL BATTERY 54 3 019 944 01 BUTTON STOP 55 3 019 943 01 BUTTON REW 56 3 019 941 01 BUTTON PLAY 57 3 019 942 01 BUTTON FF 58 3 018 9...

Page 15: ...703 816 31 SCREW M1 4 SPECIAL HEAD 103 3 019 776 01 GEAR REEL S 104 3 703 816 73 SCREW M1 4 SPECIAL HEAD 105 X 3369 749 1 PINCH LEVER N ASSY Ref No Part No Description Remarks Ref No Part No Description Remarks 106 3 920 996 01 SPRING PINCH N M901 1 763 073 11 MOTOR HP901 1 500 517 11 HEAD MAGNETIC PLAYBACK ...

Page 16: ...NG PLAY CP 154 3 019 773 01 GEAR AS 155 X 3374 598 1 CLUTCH ASSY S 156 3 022 093 01 SPRING FR S 157 3 022 094 01 SPRING STOP S 158 3 019 777 01 LEVER OW S DETECTION 159 3 728 091 01 WASHER STOPPER 160 3 019 778 01 SLEEVE MS 161 3 921 335 01 WASHER LEVER 162 3 920 990 01 SPRING UD COMPRESSION 163 3 019 774 01 GEAR BS 164 X 3369 747 1 WHEEL ASSY SP CAPSTAN 165 3 019 775 01 GEAR DS 166 3 014 709 01 S...

Page 17: ...CERAMIC CHIP 1uF 16V EX172 C132 1 164 505 11 CERAMIC CHIP 2 2uF 16V EX172 C133 1 164 489 11 CERAMIC CHIP 0 22uF 10 16V EX172 C134 1 164 346 11 CERAMIC CHIP 1uF 16V EX172 C201 1 163 005 11 CERAMIC CHIP 470PF 10 50V EX170 C201 1 163 007 11 CERAMIC CHIP 680PF 10 50V EX172 C203 1 163 017 00 CERAMIC CHIP 0 0047uF 5 50V C204 1 126 157 11 ELECT 10uF 20 16V C205 1 164 005 11 CERAMIC CHIP 0 47uF 25V EX170 ...

Page 18: ... 216 296 91 SHORT 0 JR311 1 216 296 91 SHORT 0 JR312 1 216 296 91 SHORT 0 EX170 JR313 1 216 296 91 SHORT 0 JR314 1 216 296 91 SHORT 0 JR315 1 216 296 91 SHORT 0 JR316 1 216 296 91 SHORT 0 EX172 JR317 1 216 296 91 SHORT 0 EX172 JR318 1 216 296 91 SHORT 0 EX172 JR319 1 216 296 91 SHORT 0 EX172 JR320 1 216 296 91 SHORT 0 EX172 JR321 1 216 296 91 SHORT 0 EX172 JR322 1 216 296 91 SHORT 0 EX172 JR323 1 ...

Page 19: ...ETECTION SMALL TYPE POWER S303 1 692 298 11 SWITCH SLIDE TAPE SELECTOR S305 1 692 298 11 SWITCH SLIDE AVLS THERMISTOR TH601 1 810 794 11 THERMISTOR POSITIVE MISCELLANEOUS 11 1 475 439 11 MEGA BASS UNIT SWITCH EX170 11 1 475 441 11 MEGA BASS UNIT DOLBY EX172 HP901 1 500 517 11 HEAD MAGNETIC PLAYBACK M901 1 763 073 11 MOTOR ACCESSORIES PACKING MATERIALS 1 505 521 11 HEADPHONES MDR 023 EXCEPT E 6E 9E...

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