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MICROFILM
SERVICE MANUAL
US Model
Canadian Model
AEP Model
E Model
Chinese Model
WM-FX477/FX479
RADIO CASSETTE PLAYER
Photo: WM-FX477
Radio section
Frequency range
FM: 65 ­ 74/87.5 ­ 108 MHz (East
European)
87.5 ­ 108 MHz (Except East European)
AM: 530 ­ 1,710 kHz (US, Canadian)
531 ­ 1,602 kHz (Except US, Canadian)
Tape section
Frequency response
(Dolby NR off)
Playback: 30 ­ 14,000 Hz
Output
Headphones/earphones (
2 jack)
Load impedance 8 ­ 300 ohms
General
Power requirements
3 V DC batteries R6 (AA)
× 2/
External DC 3 V power sources
Dimensions (w/h/d)
Approx. 115.8
× 85 × 33.4 mm
(4 5/8
× 3 3/8 × 1 3/8 inches) incl.
projecting parts and controls
Mass
Approx. 175 g (6.2 oz.)/Approx.
255 g (9.0 oz.) incl.batteries and a
cassette
Supplied accessories
Stereo headphones or Stereo
earphones (1)
Carrying case (1)
Design and specifications are subject to change without
notice.
SPECIFICATIONS
Model Name Using Similar Mechanism
WM-FX483
Tape Transport Mechanism Type
MF-WMFX483-147
Notes on Chip Component Replacement
· Never reuse a disconnected chip component.
· Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.
Dolby noise reduction manufactured under license from Dolby Labo-
ratories Licensing Corporation.
"DOLBY" and the double-D symbol
a are trademarks of Dolby
Laboratories Licensing Corporation.
Ver 1.0 1999. 02


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TABLE OF CONTENTS
1. GENERAL ........................................................................... 3
2. DISASSEMBLY
2-1. Cabinet (Front) Assy ........................................................... 5
2-2. Display Board ..................................................................... 6
2-3. Holder (Sub) Assy, Cassette ................................................ 6
2-4. Main Board ......................................................................... 7
2-5. Mechanism Deck ................................................................. 7
2-6. Belt and Motor .................................................................... 8
3. MECHANICAL ADJUSTMENTS ................................. 9
4. ELECTRICAL ADJUSTMENTS
Tape Section ............................................................................ 9
Tuner Section ......................................................................... 10
5. DIAGRAMS
5-1. IC Pin Description ............................................................. 12
5-2. Block Diagram .................................................................. 14
5-3. Schematic Diagram ­Main Section­ ................................. 16
5-4. Printed Wiring Board ­Main Section­ .............................. 19
5-5. Printed Wiring Board ­Display Section­ .......................... 21
5-6. Schematic Diagram ­Display Section­ ............................. 23
6. EXPLODED VIEWS
6-1. Cabinet Section ................................................................. 26
6-2. Tape Mechanism Deck Section ......................................... 28
7. ELECTRICAL PARTS LIST ......................................... 29


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SECTION 1
GENERAL
This section is extracted
from instruction manual.


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B
C
D
E
F
G
H
I
J
K
S701
cabinet (front) assy
A
cabinet (front) assy
2 screw (1.7x2.5), tapping
1 screw (1.7x2.5), tapping
holder (sub) assy, cassette
Cabinet (front) assy
Set
Main board
Holder (sub) assy, cassette
Belt and Motor
Mechanism deck
Display board
SECTION 2
DISASSEMBLY
2-1. CABINET (FRONT) ASSY
Note : When installing, fit the knobs and switches.
3 Insert the precision screwdriver
(1.4 mm flat-blade) into the slit
at claw A and release the claw.
4 Remove the cabinet (front) assy.
(Release all claws B to K in
alphabetical order.)
· The equipment can be removed using the following procedure.
Note : Follow the disassembly procedure in the numerical order given.
Note : When removing the cabinet, put cloth
on the end of a screwdriver or use a
polyacetal driver to avoid damage to
the cabinet.