Sony WMEX-7 Service manual

WM-EX7

SERVICE MANUAL

Manufactured under license from Dolby Laboratories Licensing Corporation. ÒDOLBYÓ and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.

U.S and foreign patents licensed from Dolby Laboratories Licensing Corporation.

US Model

Canadian Model

AEP Model

UK Model

E Model

Tourist Model

Model Name Using Similar Mechanism WM-EX5

Tape Transport Mechanism Type MT-WMEX7-125

SPECIFICATIONS

Tape section

Frequency response (Dolby NR off) Playback : 30 — 18,000 Hz Output Headphones (REMOTE 2 jack)

General

Power requirements 1.5 V

Dimensions (w/h/d) Approx. 80.2 · 112.2 · 21.45 mm

Mass Approx. 180 g (6.4 oz.)

Load impedance 8 — 300 W

One rechargeable battery or one R6 (size AA) battery

1 ·

4 inches), incl.

projecting parts and controls

Approx. 245 g (8.7 oz) (incl. rechargeable battery and cassette)

Supplied accessories Battery case (1)

Stereo earphones with remote control (1) Battery charger (1) Rechargeable battery NC-6WM, 1.2 V, 600 mAh, Ni-Cd (1) (US, Canadian, and Eupopean model) NH-14WM, 1.2 V, 1,400 mAh, Ni-MH (1) (Korean and other countries model) Rechageable battery carrying case (1) Carrying pouch (1) AC plug adaptor (1) (Except for US, Canadian, European, and Korean model)

Design and specification subject to change without notice.

www.electronicsrepair.net

MICROFILM

CASSETTE PLAYER

TABLE OF CONTENTS

1. GENERAL ·········································································· 3

2. SERVICE NOTE······························································· 5

3. DISASSEMBLY

3-1. CASSETTE LID ASSY·················································· 7 3-2. REEL ORNAMENT (B) SLIDER··································7 3-3. CASE ·············································································· 8 3-4. REEL ORNAMENT (B) ASSY······································ 8 3-5. AUDIO BOARD ·····························································8

4. MECHANICAL ADJUSTMENT ·································· 9

5. ELECTRICAL ADJUSTMENT ····································9

6. DIAGRAMS

6-1. BLOCK DIAGRAM ····················································· 10 6-2. SCHEMATAC DIAGRAM ··········································· 12 6-3. PRINTED WIRING BOARD······································· 15 6-4. IC BLOCK DIAGRAMS··············································19 6-5. IC PIN FUNCTION······················································ 22

7. EXPLODED VIEWS

7-1. CABINET BLOCK·······················································24 7-2. AUDIO BOARD BLOCK············································· 25 7-3. MECHANISM DECK BLOCK (MT-WMEX7-125) ···26

8. ELECTRICAL PARTS LIST······································· 27

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

Flexible Circuit Board Repairing

• Keep the temperature of soldering iron around 270˚C during 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.

SAFETY-RELATED COMPONENT WARNING!!

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.

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ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE ! SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

SECTION 1

GENERAL

This section is extracted from instruction manual.

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— 4 —

SECTION 2

IC601

IC701

BP701

IC301

IC305

IC303

IC302

BP702

IC801

F side

S704

IC304

Center

R side

Lever (SW)

Center

R side

F side

SERVICE NOTE

[Service Mode]

The service mode enables to operate and check the mechanism of WM-EX7 while the AUDIO board is opened.

1. How to enter the service mode

1) Remove the cabinet referring to section 3 DISASSEMBLY. Open the AUDIO board.

2) Connect the motor and plunger solenoid to the AUDIO board using jumper wires. The motor and plunger solenoid can be easily connected when the extension jig (1-769-143-11) (10 cables are bound as a jig.)

3) Short the service mode land (BP701) and the holder land (BP702) as shown using soldering.

4) Connect DC 1.3 V from a regulated po wer supply to the ‘ and ’ terminals of battery.

5) Remove soldering from the service mode land (BP701).

2. PRE-SET status

The PLAY, FF and REW mode can be entered only from the PRESET status.

1) Check that the lever (SW) is in the center position, and the F/R switch (S704) is also I the center position. When these switches are not in the center position, set them to the center (pre-set) position as follows.

2) Find the position in which the lever (SW) is set (either F or R position). Move the F/R switch (S704) into the position in which the lever (SW) is set.

(3) The lever (SW) can be moved by turning OFF the main power

of the regulated power supply once then back ON. Move the F/R switch (S704) to the center position in synchronism with this timing.

[AUDIO board]

— Side A —

— Side B —

3. FF, REW modes

1) After confirming the “2. PRE-SET status”, press the FF switch or the REW switch.

4. PLAY mode

1) Confirm the “2. PRE-SET status”.

2) When the 9( switch of the remote control is pressed, the lever (SW moves once to the R side then moves to the F side. Move the F/W switch (S704) to the R side in synchronism with the motion of the lever (SW). It enables the system to enter into the PLAY (R side) mode.

Note 1: When you fail to enter the PLA Y mode, re-start from ste p

1) PRE-SET status.

Note 2: When you operate 9(, p, FF, REW switch, use these

switches of the remote control unit as much as possible.

[Lever (SW)]

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[Tape drive mechanism]

Tape drive mechanism in PLAY mode

Gear (NR)

Gear (Reel) T side

Gear (TA)

Gear (Y)

Flywheel (N) Assy

(REW:Right side/ FWD:Left side)

Gear (TB)

Gear (S)

Clutch Assy (M)

Flywheel (R) Assy

Tape drive mechanism in REW mode

Gear (FR) (REW:Right side)

Gear (NR)

Gear (S)

Gear (Reel) (S side)

Pulley (Reverse)

Gear (Reel) (S side)

Motor Pulle

Tape drive mechanism in FF mode

Gear (TB)

Gear (Reel) (T side)

Gear (Y)

Flywheel (N) Assy

Gear (FR) (FF:Left side)

Clutch Assy(M)

Flywheel (R) Assy

Motor Pulley

Gear (NR)

Pulley (Reverse)

Gear (Y)

Flywheel (N) Assy

Clutch Assy(M)

Flywheel (R) Assy

Pulley (Reverse)

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+ 14 hidden pages