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WM-FX495
SERVICE MANUAL
SPECIFICATIONS
US Model
AEP Model
Model Name Using Similar Mechanism
NEW
MD Mechanism Type
MF-WMFX495-147
9-877-098-03
2005L02-1
© 2005.12
Sony Corporation
Personal Audio Division
Published by Sony Engineering Corporation
RADIO CASSETTE PLAYER
Ver. 1.2 2005.12
· Frequency range
FM : 87.5 - 108 MHz
AM: 530 - 1 710 kHz (North, America)
531 - 1 602 kHz (Other countries)
· Output
Headphones (i) jack Load impedance 8 - 300
· Power requirements
1.5V DC, battery R6 (size AA) x 1
· Dimensions (w/h/d)
Approx. 81.1 x 111.2 x 29.3 mm (31/4 x 41/2 x13/16 in.), excl.
projecting parts and controls
· Mass
Approx. 137 g (4.9 oz) (main unit only)
· Supplied accessories
Stereo headphones or earphones with remote control (1)
Carrying case or Carrying pouch or Hand strap (1)
Design and specifications are subject to change without notice.
Battery life* (approximate hours)
Sony alkaline
Sony R6P
LR6 (SG)**
(SR)
Tape playback
35
9
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 a Sony LR6(SG) "STAMINA" alkaline dry
battery (produced in Japan).
Note
· The battery life may be shorter depending on the operating condition, the
surrounding temperature and battery type.


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2
WM-FX495
Specifications ........................................................................... 1
1. SERVICING NOTE ...................................................... 3
2. GENERAL ...................................................................... 4
3. DISASSEMBLY
3-1. Cabinet (Front)Sub Assy ............................................ 5
3-2. Main Board ................................................................. 6
3-3. Mechanism Deck ........................................................ 6
3-4. Cassette Holder Sub Assy ........................................... 7
4. ADJUSTMENTS
4-1. Mechanical Adjustments ............................................ 8
4-2. Electrical Adjustments ................................................ 8
5. DIAGRAMS
5-1. Block Diagram ........................................................... 11
5-2. Printed Wiring Boards .............................................. 12
5-3. Schematic Diagram ­Main Section (1/2)­ ............... 13
5-4. Schematic Diagram ­Main Section (2/2)­ ............... 14
5-5. IC Block Diagrams ................................................... 15
6. EXPLODED VIEWS
6-1. Cabinet Section ......................................................... 17
6-2. Mechanism Deck Section
(MF-WMFX495-147) ....................... 18
7. ELECTRICAL PARTS LIST ................................... 19
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 dam-
aged by heat.
TABLE OF CONTENTS


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3
WM-FX495
SECTION 1
SERVICING NOTES
This set detects the rotation of the idler gear (A) (side S) using the
photo reflector (PH751). The PH751 is mounted on the MAIN
board, therefore the idler gear (A) (side S) cannot be detected with
the MAIN board removed. As a result, the motor (M601) cannot
be controlled, causing malfunction.
Further, the MD CONT switch (S601) is also mounted on the
MAIN board, and with the board removed, the mechanism posi-
tion cannot be detected and the operation is not changed over.
Therefore, when the voltage check is executed with the MAIN
board removed, follow the procedure provided below.
1. Setting
1) Refer to "3. DISASSEMBLY", and remove the MAIN board.
2) Connect the MAIN board to the motor (M601) using jumper
wires. These can be connected easily with the use of the
extension tool (Part No. 1-769-143-11) (ten in one set).
3) Connect the AF oscillator to the TP752 and the BT401 (BATT­
).
4) Supply 1.5 V to the battery terminals using the regulated power
supply.
2. Preset state
To set the PLAY, FF, REW modes, the preset state must be set.
1) Check that the slider (NRA) and the MD CONT switch (S601)
are set to the center position. If not, set the preset state as fol-
low.
2) Move the MD CONT switch (S601) to the side, which the
slider (NRA) is facing.
3) The slider (NRA) will move when the regulated power supply
switch is set to OFF once and then set to ON. Move the MD
CONT switch (S601) according to this timing and set to the
center position.
3. FF, REW modes
1) Check that the preset state is set.
2) Input the square wave or sine wave to the TP752 and the BT401
(BATT­).
3) Press the [FF] button or [REW] button .
4. PLAY mode
1) Check that the preset state is set.
2) Input the square wave to the TP752 and the BT401 (BATT­).
3) Press the Y button will move the slider (NRA) once towards
the side REV and then to the side FWD. Move the MD CONT
switch (S601) according to this timing will set the PLAY mode
(side FWD). Press the Y button another time for a second
and move the MD CONT switch (S601) according to the move-
ment of the slider (NRA) will set the PLAY mode (side REV).
Note 1:
If the above fails, perform from preset again.
Note 2:
When using headphones, the timing for move the MD
CONT
switch (S601) can be determined from the beep
sound.
S601
(MD CONT)
BT401
FF
FWD
t
RVS
REW
t
t
PH751
TP752
(PHOTO)
connect to themotor (M601)
battery
terminal 3
battery terminal #
+
­
AF oscillator
1k
square wave
2 Hz, 2 VdB
2Vp-p
­ MAIN Board (Component Side) ­
­ MAIN Board (Conductor Side) ­


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4
WM-FX495
SECTION 2
GENERAL
This section is extracted from
instruction manual.
LOCATING THE CONTROLS
­Tape mode­
MENU
OPEN
SET
Plug in firmly.
VOL*
Y ·DIRECTION**
x·RADIO OFF
REW·PRESET/
TUNING ­
HOLD
*
There is a tactiledot beside VOL on the main unitto showthe directionto turnup the volume.
**
The button has a tactile dot.
i
FF·PRESET/
TUNING+
FM
AM
­Radio mode­


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5
WM-FX495
SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1. CABINET (FRONT) SUB ASSY
z
The equipment can be removed using the following procedure.
MAIN board
Cassette holder sub ASSY
Mechanism deck
Set
Cabinet (front) sub ASSY
8
Cabinet (front) sub ASSY
6
Claws
5
Claws
7
1
2
Screw (B 1.7 × 9), tapping
4
Claws
3
Screw (B 1.7 × 9), tapping
Cabinet center