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WM-FX888
Note on the AC power adaptor
Use only the supplied AC power adaptor. Do not use
any other AC power adaptor.
Polarity of
the plug
TABLE OF CONTENTS
1. SERVICING NOTES
............................................... 3
2. GENERAL ................................................................... 5
3. DISASSEMBLY
3-1. Disassembly Flow ........................................................... 6
3-2. Case Section .................................................................... 6
3-3. MAIN Board ................................................................... 7
3-4. Belt (F2) .......................................................................... 7
3-5. Motor (Capstan/Reel) (M601) ........................................ 8
3-6. Cassette Lid Sub Assy ..................................................... 8
3-7. Reel Ornament Block Assy ............................................. 9
3-8. Holder (F) Assy (/M) ...................................................... 9
3-9. Pinch Lever (RA)/(NA) Assy ......................................... 10
3-10. Magnetic Head (Playback) (HP901) .............................. 10
4. MECHANICAL ADJUSTMENTS ....................... 11
5. ELECTRICAL ADJUSTMENTS ......................... 11
6. DIAGRAMS
6-1. Block Diagram - TUNER Section - ............................. 13
6-2. Block Diagram - MAIN Section - ................................ 14
6-3. Note for Printed Wiring Board
and Schematic Diagrams ................................................ 15
6-4. Printed Wiring Board - MAIN Board (Side A) - ......... 16
6-5. Printed Wiring Board - MAIN Board (Side B) - ......... 17
6-6. Schematic Diagram - MAIN Board (1/2) - .................. 18
6-7. Schematic Diagram - MAIN Board (2/2) - .................. 19
6-8. IC Pin Function Description ........................................... 21
7. EXPLODED VIEWS
7-1. Case Section .................................................................... 23
7-2. Chassis Section ............................................................... 24
7-3. Main Section ................................................................... 25
7-4. Mechanism Deck Section-1 (MF-WMFX671-162) ....... 26
7-5. Mechanism Deck Section-2 (MF-WMFX671-162) ....... 27
7-6. Mechanism Deck Section-3 (MF-WMFX671-162) ....... 28
8. ELECTRICAL PARTS LIST ............................... 29Notes 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 ΛC 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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED
LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS
AND IN THE PARTS LIST ARE CRITICAL TO SAFE
OPERATION. REPLACE THESE COMPONENTS WITH
SONY PARTS WHOSE PART NUMBERS APPEAR AS
SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
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WM-FX888
SECTION 1
SERVICING NOTES
This set detects the rotation of the idler gear (A) (side S) using the
PH1 (photo reflector). The PH1 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 DIRECTION switch (S1) is also mounted on the MAIN
board, and with the board removed, the mechanism position can-
not be detected and the operation is not changed over.
Therefor, 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) and the
plunger (PM901) 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) Short the TAPE DETECT switch (S901-1) terminals and the
ATS switch (S901-2) terminals.
(4) Connect the AF oscillator to the Q15-1 (COLLECTOR) and
the TP23 (GND).
(5) Supply 1.3 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 (NR) and the DIRECTION switch (S1)
are set to the center position. If not, set the preset state as
follow.
(2) Move the DIRECTION switch (S1) to the side, which the
slider (NR) is facing.
(3) The slider (NR) will move when the regulated power supply
switch is set to OFF once and then set to ON. Move the DI-
RECTION switch (S1) 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 Q15-1 (COLLEC-
TOR) and the TP23 (GND).
(3) Press the
[ RADIO OFF] button (S3) to set the STOP mode.
(4) Press the
[+ FF] button (S4) or the [-- REW] button (S5).
4. PLAY mode
(1) Check that the preset state is set.
(2) Input the square wave or sine wave to the Q15-1(COLLEC-
TOR) and the TP23 (GND).
(3) Press the
[ RADIO OFF] button (S3) to set the STOP mode.
(4) Press the
[ REPEAT] button (S9) will move the slider
(NR) once towards the side R and then to the side F. Move
the DIRECTION switch (S1) according to this timing will
set the PLAY mode (side F). Press the
[ REPEAT] button
(S9) another time and move the DIRECTION switch (S1)
according to the movement of the slider (NR) will set the
PLAY (R mode).
Note 1 :If the above fails, perform from preset again.
Note 2 :Use the
[ REPEAT] (S9) , [ RADIO OFF] (S3), [+ FF] (S4),
and
[-- REW] (S5) buttons on the remote controller as much as
possible. If no remote controller, do not touch the buttons with
your hands, but using a stick with a round tip.
Note 3 :When using headphones, the timing for move the DIRECTION
switch (S1) can be determined from the beep sound.
+
-
+ FF
(S4)connect to the plunger
(PM901)
battery
terminal #battery
terminal 3 square wave
(sine wave)
10 Hz, - 3.5 dBAF oscillator TAPE DETECT
(S901-1) - MAIN Board (side B) -
ATS
(S901-2)
- REW
(S5)
TP23
(GND)
S1
DIRECTION
FWDTSTOPtREV Y
REPEAT
(S9)
x
RADIO OFF
(S3)PH1Q15
connect to the
motor (M601)
xx
Y
Y
Yx
