Sony WM-FX244 Service Manual
WM-FX244
SERVICE MANUAL
Ver. 1.0 2004.11
Model Name Using Similar Mechanism WM-FX288
MD Mechanism Type MF-WMFX241-114
SPECIFICATIONS
E Model
• Frequency range
FM: 87.5 - 108 MHz
AM: 530 - 1 710 kHz (North, Central and South America)
531 - 1 602 kHz (Other countries)
• Power requirements
3V DC, batteries R6 (size AA) x 2
• Dimensions (w/h/d)
Approx. 91.4 x 115.5 x 37.8 mm (3 5 ⁄8 x 4 5 ⁄8 x 1 1 ⁄2 inches)
excl. projecting parts and controls
• Mass
Approx. 149 g (5.3 oz) (main unit only)
• Supplied accessories
Stereo headphones or Stereo earphones (1)
Carrying case with belt clip or Carrying pouch (1)
Design and specifications are subject to change without notice.
Battery life* (approximate hours)
Sony alkaline LR6 (SG)** Sony R6P (SR)
Tape playback 25 7.5
Radio reception 40 14
* Measured value by the standard of JEITA (Japan Electronics and
Information Technology Industries Association).
(Using a Sony HF series cassette tape)
** When using Sony LR6(SG) “STAMINA” alkaline dry batteries
(produced in Japan).
Note
• The battery life may be shorter depending on the operating condition,
the surrounding temperature and battery type.
9-879-312-01
2004K02-1
© 2004.11
RADIO CASSETTE PLAYER
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
WM-FX244
TABLE OF CONTENTS
Specifications ............................................................................ 1
1. GENERAL ................................................................... 3
2. DISASSEMBLY
2-1. Disassembly Flow ........................................................... 4
2-2. Cassette Holder Assy, Cabinet (Front) ............................ 4
2-3. Main Board ...................................................................... 4
2-4. Mechanism Deck ............................................................. 5
2-5. Belt, Capstan/Reel Motor (M601), Magnetic Head
(HP601) ........................................................................... 5
2-6. Casette Holder ................................................................. 6
3. ADJUSTMENTS
3-1. Mechanical Adjustments ................................................. 7
3-2. Electrical Adjustments ..................................................... 7
4. DIAGRAMS
4-1. IC Pin Function Description ............................................ 10
4-2. Block Diagrams ............................................................... 11
4-3. Printed Wiring Boards – MAIN Section – ...................... 12
4-4. Schematic Diagram ......................................................... 13
5. EXPLODED VIEWS
5-1. Cabinet Section ................................................................ 15
5-2. Mechanism Section (MF-WMFX241-114) ..................... 16
6. ELECTRICAL PARTS LIST .................................. 17
Flexible Circuit Board Repairing
• Keep the temperature of the soldering iron around 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.
Unleaded solder
Boards requiring use of unleaded solder are printed with the lead
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong viscosity
Unleaded solder is more viscous (sticky, less prone to flow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
• Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
2
LOCATING THE CONTROLS
WM-FX244
SECTION 1
GENERAL
This section is extracted
from instruction manual.
AVLS
NORM • LIMIT
VOLUME*
x STOP
M FF
N PLAY**
m REW
AM
FM
ST • FM MONO
i
MEGA BASS
ENTER
TUNING +/–
OFF
PRESET +/–
HOLD
3
WM-FX244
s
Y
• This set can be disassembled in the order shown below.
2-1. DISASSEMBLY FLOW
SECTION 2
DISASSEMBLY
SET
Note: Follow the disassembly procedure in the numerical order given.
2-2. CASSETTE HOLDER
ASSY
(Page 4)
2-2. CABINET (FRONT)
(Page 4)
2-2. CASSETTE HOLDER ASSY, CABINET (FRONT)
3
Three claws
1
Two claws
2-3. MAIN BOARD
(Page 4)
2-6. CASSETTE HOLDER
(Page 6)
Cassette holder ASSY
2
2-4. MECHANISM DECK
(Page 5)
2-5. BELT, CAPSTAN/REEL
MOTOR (M601),
MAGNETIC HEAD
(PLAYBACK)(HP601)
(Page 5)
4
Two claws
2-3. MAIN BAORD
Main board
3
Two claws
1
Four claws
4
5
1
Cabinet (Front)
Screw
2
Remove solder (five places)
Orange
Black
White
Red
4
Claw
1
Two claw
Cassette holder ASS
Head flexible board
4
2-4. MECHANISM DECK
Y
k
Mechanism deck
1
Two claws
WM-FX244
2
Cassette holder ASS
2-5. BELT, CAPSTAN/REEL MOTOR (M601), MAGNETIC HEAD (PLAYBACK)(HP601)
4
Two screws (M1.4)
6
Screws (M1.4)
5
Capstan/reel motor
(M601)
Mechanism dec
7
magnetic head
(PLAYBACK)
(HP601)
1
Claw
2
Stopper
3
Belt
5
WM-FX244
r
2-6. CASSETTE HOLDER
2
Move the hinge away
from projection
Projection
Cabinet (center)
Hinge
Hinge
Cassette holder
1
Projection
5
Hinge
Hinge
Projection
3
Move the hinge away
from projection
Projection
4
Spring (torsion)
z
CAUTIONS DURING ASSEMBLY
1 Insert the spring (torsion) to the L shape slot as shown in the figure.
2,3 Insert the hinge of the “Cassette holder ”.
4 Close the “Cassette holder” then press it.
Hinge
Spring (torsion)
L shape slot
1
2
Cassette holde
4
Hinge
3
Cabinet (center)
6
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