Sony wm f 103 service manual

Page 1

SERVICE MANUAL

SEEifilélifiiih

Dolby noise reduction manufactured under license from
Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol DC] are trademarks of
Dolby Laboratories Licensing Corporation.

US Model
Canadian Model

WM-F 100 m

AEP Model
E Model

WM-F 103

SPEC'F'CAT'ONS Model Name Using Similar Mechanism WM-F200ll/F203

Cassette player section

Tape track
14ka 2 channel stereo

Fast winding time
Approx. 3 min. 20 sec. with Sony 0sz
cassette

Frequency response (DOLBY NR of!)
40-15.000Hz

Radio sectlon
Frequency range
FM: 37.6-1OBMHZ
AM: 530-1.605kHz
Antennas
FM: Headphone cord antenna
AM: Built-in territe bar antenna

General
Power output
4mW+4mW at DC operation (at 10% harmonic
distortion)
Power requirements
1.5V DC
Size AA (H6) battery
Rechargeable battery
DC lN 145V jack accepts:
Sony Ac-D1M AC power adaptor (optional)
for use with 120 V AC, 60 Hz
Sony ESP-10 battery case (optional)
for use on two size AA (R6) batteries
Sony DOC-7O car battery cord (optional)
lor use with 12 V car battery
Dimensions
not incl. projecting parts and controls
Approx. 693 x 110.8 x 215 mm (wlhld)
(2 3/4 x4 3/8 x 7/8 inches)
with rechargeable battery case attached
Approx. 69.6 x1194 x 21.5 mm (wlhld)
(2 3/4 x 4 3/4 x 7IB inches)
with battery case attached

Tape Transport Mechanism Type MF-WMF102-01

Accessories supplied
Rechargeable battery (1) Battery charger (1)
Stereo headphones (open-air type, 1)
Rechargeable battery case (attached to the Unit. 1)
Battery case (1) Carrying case (1)

Optional Accessory

AC power adaptor AC-DtM

Car battery cord DOC-7O

Battery case EBP-1O

Flechargeeable battery NC-SWM, NC-GWM

Note: Use only the recommended AC power
adaptor or car battery cord manufactured by

Sony. Polarity ot the plugs 01 other manulac-
turers may be difterent. M

Polarity of the Sony plug

FEATURES

0 Auto-reverse function changes the tape
playback direction without turning the
cassette over

. Built-in FM/AM tuner.

0 Dolby NFl' system reduces tape hiss
noise during playback.

o TAPE selector for optimum playback with
standard tapes as well as high-perform-
ance metal tapes.

FM/AM STEREfl CASSETTE PLAYER

Approx. 200 g (7.1 oz) incl. rechargeable bat»
tery case and rechargeable battery (or battery
and battery case) not incl. other accessories

SONY.»

Page 2

WM-F1OOIlI/F103

SERVICING NOTE

TABLE OF CONTENTS

Section Title Page

. . ti .......................... 1

Flexible Circuit Board Repairing 2:33: ons ....................... 1
Servicing Nate .......................... 2

Keep the temperature of the soldering iron around

270°C during repairing. SECTION 1. DISASSEMBLY ............... 3-5
I Do not touch the soldering iron on the same can-

ductor of the circuit board (within 3 times).

0 Be careful not to apply force on the conductor SECTION 3_ ELECTRICAL ADJUSTMENTS ..... 7-8
when soldering or unsoldering.

SECTION 2. MECHANICAL ADJUSTMENTS ..... 6-7

SECTION 4. DIAGRAMS

Notes on chip component replacement 4-1. Semiconductor Lead Layouts ........... 9
4-2. hunted Wiring Boards (radio section) ...... 10

. N d' d h' t 4-3. Schematic Diagram (radio section) . t . t 11 - 12
ever reuse a 1sconnecte c ip componen . 44 Printed Wiring Boards (audio section) . - 13_14

0 Notice that the minus side of a tantalum capacttor 4.5, Wiring Diagram ............... 15-16
may be damaged by heat. 4-6. Schematic Diagram (audio section) . . . . 17 -18
SECTION 5. EXPLODED VIEWS .......... 19-21

SECTION 6. ELECTRICAL PARTS LIST ..... 22-25

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SERVICING NOTE

This set detects rotation of reel table by PH701 Therefore, the auto off circuit and tape end detec-
(Ihoto interrupter). tion will misoperate.

It cannot be detected when the audio board is re- Operation check can be done by the method
moved, because PH701 is mounted on the audio shown below even when the audio board is removed
board.

-Audio board (side B)-

SOUA RE WA VE
OSCIL LA TOR

(D

g.

20H:
0dBlV}(1 V}

O For PLAY, press the b button and turn only the O For FF and REW, press » or « button and turn
POWER switch 0N. both POWER switch and FF/REW switch ON.

-Audio board (side A)-