WM-FX171/FX173/FX177
SERVICE MANUAL
RADIO CASSETTE PLAYER
SPECIFICATIONS
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MF-WMFX171-114
US Model
WM-FX171
Canadian Model
WM-FX173/FX177
AEP Model
E Model
Chinese Model
WM-FX171/FX173
Tourist Model
WM-FX171
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-923-333-12
2003K16-1
© 2003.11
Ver 1.3 2003. 11
· Frequency range
FM : 87.6 - 107.9 MHz
AM : 531 - 1,602 kHz
·Power requirements
3V DC batteries R6 (AA)
× 2 / External DC 3V power sources
· Dimensions
FX173 : 88.5
× 118.6 × 38.2 mm
(3 1/2
× 4 3/4 × 1 9/16 inches) (w / h / d) incl. projecting parts and controls
FX171/FX177 : 88.5
× 118.6 × 37.6 mm
(3 1/2
× 4 3/4 × 1 1/2 inches) (w / h / d) incl. projecting parts and controls
· Mass
FX173 : Approx. 165 g (5.9 oz) / Approx. 245g (8.7 oz) incl. batteries
and a cassette
FX171/FX177 : Approx. 160 g (5.7 oz) / Approx. 240 g (8.5 oz) incl.
batteries and a cassette
· Supplied accessories
Stereo headphone or Stereo earphones (1) / Belt clip (1)
Design and specifications are subject to change without notice.
Photo : WM-FX173
-- 2 --
TABLE OF CONTENTS
Flexible Circuit Board Repairing
·
Keep the temperature of the soldering iron aroud 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.
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.
SECTION 1
GENERAL
1.
GENERAL ······································································ 2
2.
DISASSEMBLY
2-1.
Cabinet (Front) Assy ·························································· 3
2-2.
Main Board ········································································· 4
2-3.
Cassette Lid ········································································ 4
2-4.
Mechanism Deck ································································ 5
2-5.
Belt, Motor (Reel/Capstan) ················································ 5
3.
MECHANICAL ADJUSTMENT ······························ 6
4.
ELECTRICAL ADJUSTMENT ································ 6
5.
DIAGRAMS
5-1.
Block Diagram ··································································· 8
5-2.
Schematic Diagram (FX171/FX177 Models) ·················· 10
5-3.
Printed Wiring Board (FX171/FX177 Models) ················ 13
5-4.
Printed Wiring Board (FX173 Model) ····························· 17
5-5.
Schematic Diagram (FX173 Model) ································ 21
5-6.
IC Block Diagrams ··························································· 24
6.
EXPLODED VIEWS
6-1.
Cabinet Section ································································· 25
6-2.
Main Board Section ·························································· 27
6-3.
Mechanism Section-1 ······················································· 28
6-4.
Mechanism Section-2 ······················································· 29
7.
ELECTRICAL PARTS LIST ··································· 30
This section is extracted
from instruction manual.
· LOCATION OF CONTROL
-- 3 --
SECTION 2
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
B
C
D
E
F
G
H
I
J
K
L
A
Cassette lid
Cabinet (front) assy
1 Two screws
[screw (B 1.7
× 9), tapping]
2-1.
CABINET (FRONT) ASSY
2 Insert the precision screwdriver
(1.4 mm flat-blade) into the slit
at claw A and release the claw.
3 Remove the cabinet (front) assy.
(Release all claws B to L in
alphabetical order.)
· This set can be disassembled in the order shown below.
2-1. CABINET (FRONT) ASSY
2-2. MAIN BOARD
2-3. CASSETTE LID
2-4. MECHANISM DECK
2-5. BELT, MOTOR (REEL/CAPSTAN)
-- 4 --
5 Spring (torsion)
B
A
1 Open the cassette lid.
4 Cassette lid.
2-2.
MAIN BOARD
2-3.
CASSETTE LID
2 Insert a precision screwdriver
(1.4 mm flat-blade) vertically
into portion A to release the
hinge plate.
3 Portion B to release the
hinge plate.
3 Remove the four solders.
4 Screw (M 1.4), toothed lock (WH)
2 Flexible board (CN302)
6 MAIN board
5 Two claws
1 Head flexible board (CN301)
-- 5 --
1 Insert the precision screwdriver
(1.4 mm flat-blabe) in to the slit
and release two claws.
2 Remove the mechanism deck
in the direction of the arrow,
2 Two screws [screw (M 1.4), special head]
3 Motor (reel/capstan)
1 Belt
2-4.
MECHANISM DECK
2-5.
BELT, MOTOR (REEL/CAPSTAN)