Manufactured under license from Dolby Laboratories
"DOLBY" and the double-D symbol a are trademarks
of Dolby Laboratories Licensing Corporation.
Model Name Using Similar Mechanism
Tape Transport Mechanism Type
U.S and foreign patents licensed from Dolby
Laboratories Licensing Corporation.
(Dolby NR off)
Playback : 30 18,000 Hz
Headphones (REMOTE 2 jack)
Load impedance 8 300
One rechargeable battery or one R6 (size AA)
× 112.2 × 21.45 mm
× 41/2 × 7/8 inches), incl.
projecting parts and controls
Approx. 180 g (6.4 oz.)
Approx. 245 g (8.7 oz) (incl. rechargeable
battery and cassette)
Battery case (1)
Stereo earphones with remote control (1)
Battery charger (1)
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.
-- 2 --
TABLE OF CONTENTS
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.
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.
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
· 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
1. GENERAL ·········································································· 3
2. SERVICE NOTE ······························································· 5
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
6-1. 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
-- 3 --
This section is extracted
from instruction manual.
-- 4 --
-- 5 --
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
Remove the cabinet referring to section 3 DISASSEMBLY.
Open the AUDIO board.
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.)
Short the service mode land (BP701) and the holder land
(BP702) as shown using soldering.
Connect DC 1.3 V from a regulated power supply to the ` and
' terminals of battery.
Remove soldering from the service mode land (BP701).
2. PRE-SET status
The PLAY, FF and REW mode can be entered only from the PRE-
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.
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
3. FF, REW modes
After confirming the "2. PRE-SET status", press the FF switch
or the REW switch.
4. PLAY mode
Confirm the "2. PRE-SET status".
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 PLAY mode, re-start from step
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.
-- Side A --
-- Side B --