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MICROFILM

SERVICE MANUAL

CASSETTE PLAYER

AEP Model

E Model

TC-K6/K7

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type MT-WMEX372-114

SPECIFICATIONS

WM-EX372

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

a

 are trade-

marks of Dolby Laboratories Licensing Corporation.

Ver 1.2  1999. 03
With SUPPLEMENT 1
(9-923-319-81)
With SUPPLEMENT 2
(9-923-319-82)

Summary of Contents for Walkman WM-EX372

Page 1: ...rt Mechanism Type MT WMEX372 114 SPECIFICATIONS WM EX372 Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation DOLBY and the double D symbol a are trade marks of Dolby Laboratories Licensing Corporation Ver 1 2 1999 03 With SUPPLEMENT 1 9 923 319 81 With SUPPLEMENT 2 9 923 319 82 ...

Page 2: ...T 19 Flexible Circuit Board Repairing Keep the temperature of the soldering iron around 270 C dur ing repairing Do not touch the soldering iron on the same conductor of the circuit board within 3 times Be careful not to apply force on the conductor when soldering or unsoldering Notes on chip component replacement Never reuse a disconnected chip component Notice that the minus side of a tantalum ca...

Page 3: ... 3 SECTION 1 GENERAL This section is extracted from instruction manual ...

Page 4: ...llow the disassembly procedure in the numerical order given SECTION 2 DISASSEMBLY CABINET REAR ASS Y This set can be disassembled in the order shown below CABINET REAR ASS Y MECHANISM DECK MT WMEX372 114 BELT MAGNETIC HEAD HP901 MOTOR M901 MEGA BASS UNIT DOLBY MAIN BOARD CASSETTE HOLDER ASS Y SET 1 screw B1 7 9 1 screw B1 7 9 K L M N B C D E F G H I J cassette holder cabinet rear ass y A ...

Page 5: ...ead flexible board CN301 8 Remove the mechanism deck MT WMEX372 114 to direction of the arrow 7 claw 7 claw 5 two claws 1 Remove four solders of motor lead M901 4 toothed lock WH screw M1 4 2 flexible board CN302 1 belt 3 motor M901 2 two special head screws M1 4 4 two screws 5 magnetic head HP901 ...

Page 6: ...board CN302 3 portion B to release the hinge plate 5 spring torsion 4 cassette holder ass y 2 Insert a precision screwdriver 1 4 mm flat blade vertically in to portion A to release the hinge plate 3 cassette holder ass y 1 Attach the spring torsion as shown in the figure 2 Insert the spring torsion in the ditch to direction of the arrow A A ...

Page 7: ... 7 MEGA BASS UNIT DOLBY 4 mega bass unit dolby 1 two knobs rotary 5 flexible board 2 claw 3 Remove five claws as move the mega bass unit dolby to direction of the arrow A three claws claw claw A ...

Page 8: ...Pulling Force Measurement SECTION 4 ELECTRICAL ADJUSTMENTS Precaution Supplied voltage 2 5 V Switch and control position NORM CrO2 METAL switch NORM VOLUME CONTROL maximum TONE CONTROL HIGH and LOW mechanical center AVLS switch NORM MEGA BASS switch OFF DOLBY NR switch OFF Test tape 0 dB 0 775 V Tape Speed Adjustment Procedure Type Signal Used for WS 48A 3 kHz 0 dB Tape Speed Adjustment frequency ...

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Page 11: ...led Power voltage is dc 3 V and fed with regulated dc power supply from external power voltage jack Voltages and waveforms are dc with respect to ground in playback mode no mark PB FWD PB REV Voltages are taken with aVOM Input impedance 10 MΩ Voltage variations may be noted due to normal produc tion tolerances Waveforms are taken with a oscilloscope Voltage variations may be noted due to normal pr...

Page 12: ...y have some difference from the original one Color Indication of Appearance Parts Example KNOB BALANCE WHITE RED Parts Color Cabinet s Color Ref No Part No Description Remark Ref No Part No Description Remark 1 CASSETTE HOLDER SECTION IC Block Diagrams IC331 NJM2185AV TE2 IC601 LB1979V TLM 1 1 475 441 11 MEGA BASS UNIT DOLBY 2 3 019 937 01 ACTUATOR B 3 3 019 938 01 ACTUATOR C 4 3 007 012 01 SPRING...

Page 13: ...4 3 019 862 01 TERMINAL BATTERY 55 3 019 859 01 BUTTON STOP p 56 3 019 860 01 BUTTON FF 0 57 3 019 858 01 BUTTON PLAY 58 3 019 861 01 BUTTON REW 59 3 932 037 01 SPRING CASSETTE 60 3 019 851 01 CABINET FRONT 61 3 022 581 01 PLATE LIGHT GUIDE 62 3 019 864 01 CABINET REAR 63 3 019 856 11 LID BATTERY CASE 64 3 318 203 92 SCREW B1 7X9 TAPPING 65 3 016 420 01 STOPPER L 66 3 022 580 01 SHEET INSULATING 6...

Page 14: ...99 01 GEAR A 117 3 921 050 01 GEAR B 118 3 920 990 01 SPRING UD COMPRESSION 119 3 921 335 01 WASHER LEVER 120 3 923 530 01 SLEEVE M 121 3 728 091 01 WASHER STOPPER 122 3 921 052 01 LEVER A DETECTION 123 3 920 994 11 SPRING D SELECTION 124 3 929 419 01 LEVER BR DETECTION 125 3 938 628 01 SPRING PLAY CP 126 3 703 816 31 SCREW M1 4 SPECIAL HEAD 127 3 921 023 01 LEVER M SELECTION 128 X 3369 748 1 PINC...

Page 15: ...16V C232 1 164 505 11 CERAMIC CHIP 2 2uF 16V C233 1 164 489 11 CERAMIC CHIP 0 22uF 10 16V C234 1 164 346 11 CERAMIC CHIP 1uF 16V C301 1 163 009 11 CERAMIC CHIP 0 001uF 10 50V C302 1 163 038 00 CERAMIC CHIP 0 1uF 25V C303 1 126 153 11 ELECT 22uF 20 6 3V C304 1 164 222 11 CERAMIC CHIP 0 22uF 25V C305 1 126 176 11 ELECT 220uF 20 10V C306 1 164 346 11 CERAMIC CHIP 1uF 16V C307 1 163 038 00 CERAMIC CHI...

Page 16: ... 10W R210 1 216 049 11 RES CHIP 1K 5 1 10W R211 1 216 025 00 RES CHIP 100 5 1 10W R301 1 216 049 11 RES CHIP 1K 5 1 10W R305 1 216 081 00 METAL CHIP 22K 5 1 10W R306 1 216 057 00 METAL CHIP 2 2K 5 1 10W R309 1 216 113 00 METAL CHIP 470K 5 1 10W R324 1 216 298 00 METAL CHIP 2 2 5 1 10W R331 1 216 001 00 METAL CHIP 10 5 1 10W R332 1 216 081 00 METAL CHIP 22K 5 1 10W R333 1 216 688 11 METAL CHIP 36K ...

Page 17: ...nt 1 Refer to WM EX372 original service manual 9 923 319 11 for other information ACCESSORIES PACKING MATERIAL Page E model Chinese model Ref No Part No Description Remark 3 862 076 71 MANUAL INSTRUCTION ENGLISH CHINESE Chinese Ref No Part No Description Remark 3 862 076 61 MANUAL INSTRUCTION ENGLISH CHINESE KOREAN E 20 Sony Corporation Personal A V Products Company 98E05045 1D Printed in Japan 19...

Page 18: ...ent 2 Refer to WM EX372 original service manual 9 923 319 for other information ACCESSORIES PACKING MATERIAL Page E model Tourist model Ref No Part No Description Remark 3 864 071 11 MANUAL INSTRUCTION ENGLISH CHINESE KOREAN RUSSIAN Tourist Ref No Part No Description Remark 3 862 076 61 MANUAL INSTRUCTION ENGLISH CHINESE KOREAN E 20 Sony Corporation Personal A V Products Company 98J05031 1D Printe...

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