SERVICE MANUAL
RADIO CASSETTE PLAYER
US Model
WM-FX375
Canadian Model
Tourist Model
WM-FX373
AEP Model
E Model
Chinese Model
WM-FX373/FX375
Model Name Using Similar Mechanism
NEW
Tape Transport Mechanism Type
MT-WMEX372-114
· Frequency range
FM: 65.0 107.9 MHz (East European Model)
87.5 108 MHz (Italian, Saudi Arabia Model)
87.6 108 MHz (US, Canadian Model)
87.6 107.9 MHz (Other Model)
AM: 526.5 1,606.5 kHz (Italian, Saudi Arabia Model)
530 1,710 kHz (US, Canadian Model)
531 1,602 kHz (Other Model)
· Power requirements
3V DC batteries R6 (AA)
× 2/External DC 3V power sources
· Dimensions
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
· Mass
Approx. 170 g (6.0 oz)
Approx. 250 g (8.9 oz) incl. batteries and a cassette
· Supplied accessories
Stereo headphones or Stereo earphones (1)/Belt clip (1)
Design and specifications are subject to change without notice.
SPECIFICATIONS
WM-FX373/FX375
Photo: WM-FX373
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
"DOLBY" and the double-D symbol ; are trade-
marks of Dolby Laboratories Licensing Corporation.
9-923-344-12
Sony Corporation
2004C05-1
Personal Audio Company
© 2004.03
Published by Sony Engineering Corporation
Ver 1.2 2004.03
2
SECTION 1
GENERAL
TABLE OF CONTENTS
1.
GENERAL ................................................................... 2
2.
DISASSEMBLY ......................................................... 3
3.
MECHANICAL ADJUSTMENTS ....................... 7
4.
ELECTRICAL ADJUSTMENTS ......................... 7
5.
DIAGRAMS
5-1. Block Diagram ................................................................ 10
5-2. Printed Wiring Board ...................................................... 12
5-3. Schematic Diagram ......................................................... 15
6.
EXPLODED VIEWS ................................................ 21
7.
ELECTRICAL PARTS LIST ............................... 24
This section is extracted from
instruction manual.
SERVICING NOTES
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.
Flexible Circuit Board Repairing
· Keep the temperature of the soldering iron around 270 °C dur-
ing 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.
3
CABINET (REAR) ASS'Y
Note: Follow the disassembly procedure in the numerical order given.
SECTION 2
DISASSEMBLY
· This set can be disassembled in the order shown below.
A
2
Insert the precision screw
driver (1.4 mm flat-blade) in to
the slit at claw A and release
the claw.
3
Remove the cabinet (rear) ass'y
(Release all claw B to K in alphabetical order.)
1
two screws
(B1.7
× 9)
cabinet (rear) ass'y
I
J
K
B
C
D
E
F
G
H
5
two claws
6
main board
2
Flexible board
(CN302)
3
Flexible board
(CN301)
4
toothed lock (WH) screw
(M1.4)
1
Remove four solders
of motor (M901).
MAIN BOARD
CABINET (REAR)
ASS'Y
DIAL POINTER
SETTING
BELT, MOTOR (M901)
MAGNETIC HEAD (HP901)
MAIN BOARD
CASSETTE HOLDER ASS'Y
NOTE FOR INSTALLATION
MEGA BASS
UNIT
MECHANISM DECK
(MT-WMEX372-114)
4
MECHANISM DECK (MT-WMEX372-114)
1
belt
3
motor (M901)
2
two special head
screws (M1.4)
4
two screws (M1.4)
5
magnetic
head (HP901)
BELT, MOTOR (M901), MAGNETIC HEAD (HP901)
2
Remove the mechanism deck
(MT-WMEX372-114) to direction
of the arrow A.
A
1
two claws
5
CASSETTE HOLDER ASS'Y
NOTE FOR INSTALLATION
A
B
3
Cassette holder ass'y
4
spring
(torsion)
2
Portion B to release
the hinge plate.
1
Insert a precision screw driver (1.4 mm flat-blade)
vertically in to portion A to release the hinge plate.
3
Cassette holder ass'y
1
Attach the spring (torsion)
as shown in the figure.
2
Insert the spring (torsion)
in the ditch to direction of
the arrow A.
A
Note: Follow the assembly procedure in the numerical order given.