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Sony WM-EX668 Service Manual

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SERVICE MANUAL
Ver 1.2 2000. 03
With SUPPLEMENT 1 (9-923-312-81)
Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol a are trademarks of
Dolby Laboratories Licensing Corporation.
Tape Player section and general
Frequency response (a NR switch off)
30 – 18,000Hz
Output
Headphones (2 REMOTE jack)
Load impedance 8 – 300ohms
Power output
4mW + 4mW at DC operation
Power requirements
1.5V DC
Rechargeable battery (NC-6WM), 1.2V, 600mAH, Ni-Cd) One R6
(size AA) battery
Battery life (Aprrox. hours)
Rechargeable NC-6WM
Fully charged
Sony R6P (SR)
Sony alkaline LR6 (WM)
Rechargeable NC-6WM
Sony alkaline LR6 (WM)
Used together
Dimensions
Approx. 108.9 x 80 x 21.3 mm (w/h/d)
Weight
Approx. 150g (Main unit)
Approx. 215g (incl. Headphones with remote control, Recharge-
able battery NC-6WM (S), Type (C-60-HF))
MICROFILM
WM-EX655/EX668
Photo : WM-EX655
SPECIFICATIONS
9
9
36
45
Model Name Using Similar Machanism
Tape Transport Mechanism Type
Supplied Accessories
• Battery charger (1)
• Rechargeable battery (NC-6WM, 1.2V 600mAh, Ni-Cd) (1)
• Battery case (1) (WM-EX655)
• Stereo earphones with remote control (1) (WM-EX655)
• Carrying pouch (1)
• Rechargeable battery carrying case (1)
• Remote control unit (RM-WME654) (1)
• Sony battery R6P (SR) (1) (WM-EX655)
• AC plug adaptor (1) (WM-EX655)
• Clip (1) (WM-EX655)
Design and specifications are subject to change without notice.
CASSETTE PLAYER
AEP Model
UK Model
WM-EX668
Tourist Model
WM-EX655
NEW
MT-WMEX655-125

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Summary of Contents for Sony WM-EX668

  • Page 1 • Rechargeable battery carrying case (1) 4mW + 4mW at DC operation • Remote control unit (RM-WME654) (1) Power requirements • Sony battery R6P (SR) (1) (WM-EX655) 1.5V DC • AC plug adaptor (1) (WM-EX655) Rechargeable battery (NC-6WM), 1.2V, 600mAH, Ni-Cd) One R6 •...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS Specifications ................. 1 1. GENERAL Location and Function of Controls ......... 3 2. SERVICE NOTE ............4 3. DISASSEMBLY 3-1. Case Assy Removal ............6 3-2. Audio Board Removal ............. 6 3-3. Cassette lid Assy Removal ..........7 3-4.

  • Page 3: General

    SECTION 1 GENERAL This section is extracted from instruction manual. LOCATION AND FUNCTION OF CONTROLS Tape player section and general Main unit Headphones with Remote Control WM-EX655 WM-EX668 Left Right Left Right !∞ !º !º !¢ 1 OPEN knob 0 Main unit : VOLUME knob...

  • Page 4: Service Note

    SECTION 2 SERVICE NOTE SERVICE MODE 3. PLAY Mode Mode which enables the mechanism to be operated with the AU- 1) Input a square wave to the TP35 (PHOTO IN). (See Fig-3) DIO board opened. 2) Press the S704 (STOP) for selecting STOP mode. 3) Press the S705 (PLAY).
  • Page 5 LEVER (SW ) Rortation system during PLAY. Gear (NR) Gear (Reel) (REV : Left side/ Gear (Reel) lever (SW) (S side) FWD : Right side) Motor Pully (T side) Gear (S) Gear (TB) Gear (TA) Clutch side F side R Gear (Y) Assy (M) center...

  • Page 6: Disassembly

    SECTION 3 DISASSEMBLY The equipment can be remo ved using the f ollo wing pr ocedure . Mechanism deck Audio board Cassette lid assy Case assy Note : Follow the disassembly procedure in the numerical order given. 3-1. CASE ASSY REMOVAL 1 Screws (IB lock) 1 Screw (IB lock) Case assy...

  • Page 7: Cassette Lid Assy Removal

    SECTION 4 SECTION 5 DIAGRAMS ADJUSTMENTS 4-1. MECHANICAL ADJUSTMENTS 4-2. ELECTRICAL ADJUSTMENTS 3-3. CASSETTE LID ASSY REMOVAL 5-1. EXPLANATION OF IC TERMINALS Pin No. Pin name Description PRECAUTION PRECAUTION MB/GRV CTL MEGA BASS /GROOVE select control output. IC701 MSM6576-90GS-K (SYSTEM CONTROL) 1.

  • Page 9: Schematic Diagram

    WM-EX655/EX668 5-3. SCHEMATIC DIAGRAM Refer to page 19 for IC Block Diagrams. WAVEFORM 250mVp-p 32.768kHz IC701 !∞ XTB VOLT/DIV : 50mV AC TIME/DIV : 10µsec Note: • All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or less are not indicated except for electrolytics and tantalums.

  • Page 10: Exploded Views

    Ref. No. Part No. Description Remark 3-016-085-01 BRACKET (C) 3-007-454-01 SPRING (FR), TORSION 3-009-662-32 COVER (A), MD (WM-EX668) A-3061-556-A AUDIO BOARD, COMPLETE (EX655) X-3372-851-1 FLYWHEEL (R) ASSY 3-007-457-01 SPRING (TEN), TENSION 3-375-114-61 SCREW 3-939-590-19 SCREW (IB LOCK)•••(BLACK) 3-009-662-21 COVER (A), MD (WM-EX655)

  • Page 11: Electrical Parts List

    Ver 1.1 1998.10 SECTION 7 AUDIO ELECTRICAL PARTS LIST NOTE : • Due to standardization, replacements in the • SEMICONDUCTORS The components identified by mark ! parts list may be different from the parts In each case, u : m , for example : or dotted line with mark ! are critical specified in the diagrams or the components uA..
  • Page 12 AUDIO Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark D756 8-719-051-01 LED CL-170HR-CD-T (BL SKIP) R213 1-216-805-11 METAL CHIP 1/16W (FR) < IC > R213 1-216-864-11 METAL CHIP (EXCEPT FR) R301 1-218-891-11 METAL GLAZE 0.50% 1/16W IC301 8-759-440-52 IC TA2103F R302...
  • Page 13 3-918-892-01 CASE, CARRYING 3-920-201-01 CLIP (JEW) 8-953-219-90 HEADPHONE MDR-ED132MP//K SET (WM-EX655) 1-505-441-11 HEADPHONE MDR-WME633 (WM-EX668) The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified. – 25 –...
  • Page 14 WM-EX655/EX668 Sony Corporation 98C027551-1 Printed in Hangary © 1998.3 9-923-312-11 Personal A&V Products Company Published by Quality Engineering Dept. – 26 – (Shibaura)
  • Page 15 WM-EX655/EX668 AEP Model UK Model SERVICE MANUAL WM-EX668 Tourist Model 1998. 10 WM-EX655 SUPPLEMENT - 1 File this Supplement with the Service Manual. Subject : NO INTERCHANGEABILITY OF MOTORS DUE TO CHANGE OF MECHANISM DECK CAUTION WHEN INSTALLING A NEW MOTOR...
  • Page 16 NO INTERCHANGEABILITY OF MOTORS DUE TO CHANGE OF MECHANISM DECK MECHANISM DECK SECTION (Service Manual See page 22) (MT-WMEX655-125) : Changed portion Former Type New Type Ref. No Part No. Description Remark Part No. Description Remark 3-386-694-11 WASHER 3-386-694-21 WASHER X-3372-852-4 FLYWHEEL (N) ASSY X-3372-852-1 FLYWHEEL (N) ASSY 3-007-435-01 GEAR (FR)
  • Page 17 CAUTION WHEN INSTALLING A NEW MOTOR Always give a drop of Diamond Oil NT68 (7-661-018-18) to the hole of the shaft marked with when installing a new motor (X-3376-217-1). CHANGED PARTS LIST EXPLODED VIEWS Before Change After Change Page Ref. No. Part No.
  • Page 18 3-309-729-00 SHEET, LEAF SW • • • (BLUE, ORANGE) : Changed or added portion S901 1-759-213-21 CASE, BATTERY (WM-EX655) 1-759-213-21 CASE, BATTERY 8-953-219-90 HEADPHONE MDR-ED132MP//K SET(WM-EX655) 8-953-219-90 HEADPHONE MDR-ED132MP//K SET 1-505-441-11 HEADPHONE MDR-WME633 (WM-EX668) —————————————— CORRECTION EXPLODED VIEWS INCORRECT CORRECT Page Ref.

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