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Sony WM-EX621 Service Manual
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Sony WM-EX621 Service Manual

Sony wm-ex621 cassette player service manual
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See also: Operating Instructions
SERVICE MANUAL
Ver 1.0 2001. 10
Manufactured under license from Dolby Laboratories
Licensing Corporation.
"DOLBY" and the double-D symbol a are trademarks
of Dolby Laboratories Licensing Corporation.
Sony Corporation
9-873-318-01
2001J1600-1
Personal Audio Company
© 2001.10
Published by Sony Engineering Corporation
WM-EX621
SPECIFICATIONS
Frequency response
Playback: 30 - 18 000 Hz
Output
Headphones (i jack)
Load impedance 8 - 300
Power requirements
1.5 V
Rechargeable battery
One R6 (size AA) battery
Dimensions (w/h/d)
Approx. 77.1
108.0
20.5 mm
Mass
Approx. 158 g
Supplied accessories
• Battery case (1)
• Stereo headphones or earphones with remote control (1)
• Battery charger (1)
• Rechargeable battery (NC-6WM, 1.2 V, 600 mAh, Ni-Cd) (1)
• Carrying pouch (1)
• Rechargeable battery carrying case (1)
Design and specifications are subject to change without notice.
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
CASSETTE PLAYER
AEP Model
UK Model
E Model
Chinese Model
Tourist Model
WM-EX610
MT-WMEX610-162

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Summary of Contents for Sony WM-EX621

  • Page 1 • Rechargeable battery (NC-6WM, 1.2 V, 600 mAh, Ni-Cd) (1) • Carrying pouch (1) • Rechargeable battery carrying case (1) Design and specifications are subject to change without notice. CASSETTE PLAYER Sony Corporation 9-873-318-01 2001J1600-1 Personal Audio Company © 2001.10 Published by Sony Engineering Corporation...

  • Page 2: Table Of Contents

    COMPONENTS IDENTIFIED BY MARK ! OR DOTTED LINE WITH MARK ! 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 PUBLISHED BY SONY.

  • Page 3: Service Note

    WM-EX621 SECTION 1 SERVICE NOTE [Service Mode] The service mode enables to operate the mechanism of WM-EX621 3. FF, REW modes while the MAIN board is opened. Check that the PRE-SET status is set. Rotation of the idler gear (A) (S side) is detected using the photo- Connect square wave or sine wave to TP53 (P.
  • Page 4 WM-EX621 [ Slider (NR) ] [ Tape drive mechanism ] Tape drive mechanism in PLAY mode Gear (FR) (REW:Right side) Idler Gear (A) (S side) Gear (REEL) (S side) Slider (NR) Motor Pulley Cam Gear Gear (Y) F side R side...

  • Page 5: General

    WM-EX621 SECTION 2 This section is extracted from instruction manual. GENERAL UK, Australian, and Other models Hong Kong model Plug in firmly. HOLD VOL* HOLD REW (–) FF (+) Y•REPEAT** SOUND Swing lever MODE Y•x** OPEN There is a tactile dot beside VOL on the main unit to show the direction to turn up the volume.

  • Page 6: Playing A Tape

    FF for 2 seconds or more • For maximum performance we recommend that you the beginning (Skip during stop use a Sony alkaline battery. Reverse function) s BL SKIP Play the same side from REW for 2 seconds or more...

  • Page 7: Disassembly

    WM-EX621 SECTION 3 DISASSEMBLY Note : Follow the disassembly procedure as shown in the flow chart below. Case sub MAIN board Belt (F4) Motor (Capstan/Reel) (M901) assy Lid assy, Ornament, Holder (FS) Lever (N)/(R) Head, magnetic cassette reel assy assy, pinch (HP901) Note : Follow the disassembly procedure in the numerical order given.

  • Page 8: Main Board

    WM-EX621 3-2. MAIN BOARD 3 Remove soldering (four points) from the leaf switch. 2 Remove soldering (six points) 4 Remove soldering (two points) from the head flexible boards. from plunger solenoid. 8 MAIN board S701 6 Two screws Note : Be careful of the claw.

  • Page 9: Motor (Capstan/Reel) (M901)

    WM-EX621 3-4. MOTOR (CAPSTAN/REEL) (M901) 1 Two screws (M1.4) 2 Motor (Capstan/Reel) (M901) 3-5. LID ASSY, CASSETTE 2 Screw (P1.4 2.0) 4 Lid assy,cassette 2 Two screws (M1.4 2.0) 1 Open the cassette lid. 3 Shaft...

  • Page 10: Ornament, Reel

    WM-EX621 3-6. ORNAMENT, REEL 4 Two claws 5 Ornament,reel 3 Boss 1 Two claws 2 Claw 3-7. HOLDER (FS) ASSY 2 Shaft 7 Bracket (cassette) assy 3 Lock Lever (B) 6 Shaft 1 Two screws (M1.4 1.4) 4 Screw (M1.4)

  • Page 11: Lever (N)/(R) Assy, Pinch

    WM-EX621 3-8. LEVER (N)/(R) ASSY, PINCH 1 Claw 2 Remove the pinch lever (R) assembly in the direction of the arrow. 4 Remove the pinch lever (N) assembly in the direction of the arrow. 3 Claw Holder (FS) assy. 3-9. HEAD, MAGNETIC (HP901) 1 Two claws 2 Remove the magnetic head.

  • Page 12: Mechanical Adjustment

    WM-EX621 SECTION 4 SECTION 5 MECHANICAL ADJUSTMENT ELECTRICAL ADJUSTMENT PRECAUTION PRECAUTION Clean the following parts with a denatured-alcohol-moistened Specified voltage: 1.3 V (DC) swab: Switch position (MENU) playback head pinch roller AVLS : OFF rubber belts capstan BL SKIP : OFF Demagnetize the playback head with a head demagnetizer.

  • Page 13: Diagrams

    WM-EX621 SECTION 6 DIAGRAMS SIGNAL PATH 6-1. BLOCK DIAGRAM RIPPLE FILTER BATT B+ : PLAYBACK Q301 AUDIO MASTER AMP IC301 R-ch is omitted due to same as L-ch. RF OUT BASE HP901 J301 RV301 (PLAYBACK) IN-L POWER AMP L-CH OUT-L...

  • Page 14: Schematic Diagrams

    WM-EX621 6-2. NOTE FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. 6-3. IC BLOCK DIAGRAMS Note on Printed Wiring Board: Note on Schematic Diagram: IC301 TA2123AF (EL) • X : parts extracted from the component side. • All capacitors are in F unless otherwise noted. pF: •...

  • Page 15: Schematac Diagram - Main Board

    WM-EX621 6-4. SCHEMATIC DIAGRAM – MAIN BOARD – 1.3 Vp-p 30.5 sec Vp-p 11 sec IC B/D IC B/D S901-1 S901-2 (DETECT) (ATS)

  • Page 16: Printed Wiring Board - Main Board

    WM-EX621 6-5. PRINTED WIRING BOARD – MAIN BOARD – • : Uses unleaded solder. EXCEPT IC703 (P.IN) IC701 IC601 IC301 (GND) IC702 IC704 EXCEPT FR • Semiconductor Location Ref. No. Location Ref. No. Location Ref. No. Location Ref. No. Location...

  • Page 17: Ic Pin Function

    WM-EX621 6-6. IC PIN FUNCTION • MAIN BOARD IC701 ML63512-129TBZ060 (SYSTEM CONTROL) Pin No. Pin Name Description N.C. – Not used FWD SW Detection switch (S701) input terminal “L”: FWD CENTER SW Detection switch (S701) input terminal “L”: CENTER Detection switch (S701) input terminal “L”: REV...
  • Page 18 WM-EX621 Pin No. Pin Name Description AMS IN AMS detection signal input from TA2123AF (IC301) “H”: No music LED AVLS Drive signal output for AVLS display Not used in this machine (empty terminal) LED BLSKIP Drive signal output for BL SKIP display Not used in this machine (empty terminal)

  • Page 19: Exploded Views

    WM-EX621 SECTION 7 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • Color Indication of Appearance Parts Example: When indicating parts by reference number, have some differences from the original one. KNOB, BALANCE (WHITE) . . . (RED) please include the board name.

  • Page 20: Main Board Block

    WM-EX621 7-2. MAIN BOARD BLOCK MT-WMEX610-162 S901 supplied Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-375-114-41 SCREW 3-939-590-05 SCREW (IB LOCK) * 52 A-3021-537-A MAIN PC BOARD ASSY 3-038-054-01 LEVER (B), LOCK (AEP,CH,EE,HK,JEW,KR,UK) 3-389-523-02 SCREW (IB LOCK)

  • Page 21: Machanism Block - 1

    WM-EX621 7-3. MECHANISM BLOCK –1 M901 HP901 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-046-789-01 SPRING (HDA) 3-029-306-11 FLYWHEEL (N), INSERT X-3378-354-1 HOLDER (FS) ASSY 3-220-035-01 BELT (F4) 3-029-275-01 WASHER (STOPPER N) 3-029-282-01 GEAR (Y)

  • Page 22: Machanism Block - 2

    WM-EX621 7-4. MECHANISM BLOCK –2 PM901 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 3-010-274-02 TABLE, REEL 3-029-286-01 GEAR (NR) 3-010-954-01 SPRING (BT), COMPRESSION 3-029-273-01 GEAR (FR) X-3377-584-1 CHASSIS ASSY (F) 3-007-433-01 SHEET (N), REFLECTION 3-010-273-02 GEAR (REEL)

  • Page 23: Electrical Parts List

    WM-EX621 SECTION 8 MAIN ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • CAPACITORS: When indicating parts by reference number, parts list may be different from the parts uF: F please include the board name. specified in the diagrams or the components •...
  • Page 24 WM-EX621 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < JACK > R213 1-216-853-11 METAL CHIP 470K 1/16W R214 1-216-853-11 METAL CHIP 470K 1/16W J301 1-779-867-11 JACK (i) R215 1-216-815-11 METAL CHIP 1/16W R250 1-216-811-11 METAL CHIP 1/16W <...
  • Page 25 WM-EX621 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < SWITCH > ACCESSORIES ************ S701 1-771-475-11 SWITCH, SLIDE (DERECTION) 1-528-580-21 BATTERY CHARGER (BC-7HT) (JEW) S702 1-771-053-11 SWITCH, KEY BOARD (x) 1-528-661-15 BATTERY CHARGER (BC-7DR) (KR)

  • Page 26: Revision History

    WM-EX621 REVISION HISTORY 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...

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