Sony wm ex 550 service manual

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W_|V|-EX550[EX55_2

SERIIICE MANUAL

am: WFiLHiilivlll

Photo: WM-EX550

AEP Model
E Model

WM-EX550/EX552

Tourist Model

WM-EX552

Tape Section

Frequency response (Dolby NR off)

Playback: 20 - l8.000 Hz
Output

Headphones QREMOTE jack

Load impedance 8 A 300 ohms
Power output

4 mW 4» 4 mw (16 ohms)

General

Power requirements
I .5 V
One R6 (size AA) battery
Dimensions (wlh/d)
Approx. 108.9 x 79.6 x 28.6 mm.
incl. projecting parts and controls
Mass
Approx. I45 g
EXSSZ: Approx. 240 g
(incl. battery, headphones with
remote control and cassette)
EXSSO: Approx. 235 g
(incl. battery, headphones and
cassette)
Supplied accessories
0 Stereo headphones with remote
control (I) (EX552 only)
0 Clip (I) (EX552 only)
0 Stereo headphones (I ) (EX550
only)
. Carrying case (I)
0 AC plug adaptor (I) (EXSSZ,
Tourist model only)
0 Rechargeable battery

NC-AA, 1.2 V. 600 mAh. Ni-Cd
(l) (EXSSZ, Tourist model only)

0 Battery chager ( l ) (EXSSZ,
Tourist model only)

0 Sony battery R6? (SR) (l)
(EXSSZ. Tourist model only)

Design and specifications are subject
to change without notice.

Model Name Using Similar Mechanism NEW

Tape Transport Mechanism Type

MT-WMEX550-125

SPECIFICATIONS

When to replace the battery
Replace the battery with a new one
when the BATT lamp dims

Baneg life (Approx hours)
Sony Sony
alkaline FISP (SR)

_ LRG (8G)

Tape playback 29 8

Note

0 The battery life may shorten

depending on the operation of the
unit.

For maximum performance we
recommend that you use an alkaline
battery.

Notes

0 Do not charge a dry battery.

0 When the battery is replaced the
setted functions will be cancelled.
the unit will relum to the factory
settings.

o When you do not use the Walkman
for a long time, remove the battery
to avoid any damage caused by
battery leakage and subsequent
corroston,

House Current

(so. H!- (9)

Connect the AC power adaptor

AC-ElSHG (not supplied) to the
DC IN 1.5V jack and to the wall

outlet. Do not use any other AC
power adaptor.

Polarity of
the plug

CASSETTE PLAYER
ONY.

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TABLE OF CONTENTS

GENERAL ............................................................ 3
SERVICE NOTE ................................................... 4
DISASSEMBLY... 6
MECHANICAL ADJUSTMENTS ....................... ll
ELECTRICAL ADJUSTMENTS ......................... 11

DIAGRAMS
lC Pin Function Description
Printed Wiring Board
Schematic Diagram i,

EXPLODED VIEWS .

ELECTRICAL PARTS LIST ............................. 26

SERVICING NOTES

Flexlble Circuit Board Repalring

0 Keep the temperature of the soldering iron around 270 ° C dur-
ing repairing.

0 Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).

0 Be careful not to apply force on the conductor when soldering
or unsoldering

Notes on chip component replacement

0 Never reuse a disconnected chip component

I Notice that the minus side of a tantalum capacitor may be dam-
aged by heat,