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WM-FX651/FX653/FX655
AEP Model
WM-FX651/FX653/FX655
E Model
WM-FX653/FX655
Australian Model
Tourist Model
WM-FX655
Canadian Model
WN-FX653
SERVICE MANUAL
RADIO CASSETTE PLAYER
Sony Corporation
Personal Audio Company
Published by Sony Engineering Corporation
9-923-157-12
2002A1600-1
© 2002.1
Ver 1.1 2002. 01
Photo : WM-FX651


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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.
Specification ················································································· 1
1. GENERAL ·········································································· 3
2. SERVICE NOTE ······························································· 3
3. DISASSEMBLY
3-1. Case Assy Removal ······················································· 4
3-2. Tuner Board Removal ··················································· 4
3-3. Audio Board Removal ··················································· 5
3-4. Cassette Lid Assy Removal ··········································· 5
3-5. Mechanism Deck Removal ··········································· 6
4. MECHANICAL ADJUSTMENT ·································· 7
5. ELECTRICAL ADJUSTMENT ···································· 7
6. EXPLANATION OF IC TERMINALS ························· 9
7. DIAGRAMS
7-1. Printed Wiring Boards (Tuner Section) ······················· 11
7-2. Schematic Diagram (Tuner Section) ··························· 15
7-3. Schematic Diagram (Audio Section) ··························· 18
7-4. Printed Wiring Board (Audio Section) ························ 21
8. EXPLODED VIEWS
8-1. Cabinet Section ··························································· 27
8-2. Audio, Tuner Board Section ········································ 28
8-3. Mechanism Section (MT-WMEX550-125) ················· 29
9. ELECTRICAL PARTS LIST ······································· 30


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SECTION 1
GENERAL
· LOCATION OF CONTROL
SECTION 2
SERVICE NOTE
· Regarding the method of adjustment and voltage check, perform sections 3-1 and 3-2 of the DISASSEMBLY, and attach the JIG to the
AUDIO board as shown below.
Screw
(M1.4
× 5.0)
Screw (M1.4
× 5.0)
TUNER board
Screw (M1.7
× 4.0)
Screw
(M1.4
× 5.0)
JIG
AUDIO board
1
2
4
5
6
3
9
!
0
8
!"
!`
7
1
OPEN knob
4
TUNING + button
6
ENTER button
7
/REPEAT button
8 p
/RADIO OFF button
9
MENU button
0
SET button
!
BAND button
!`
VOLUME knob
!"
HOLD knob
Display window
2 REMOTE jack
5
TUNING ­ button
2
PRESET + /AMS FF button
3
PRESET ­ /AMS REW button


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SECTION 3
DISASSEMBLY
Note : Follow the disassembly procedure in the numerical order given.
3-1.
CASE ASSY REMOVAL
3-2.
TUNER BOARD REMOVAL
5
Case assy
3
Screw
(M1.4
× 2.2)
1
Screw
(M1.4
× 2.2)
2
Screw
(M1.4
× 2.2)
4
1
Scew (M1.7
× 6)
4
TUNER board
3
Scew
(M1.4
× 4.5)
6
GUIDE (TU )
5
2
Scew (M1.7
× 3)


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3-3.
AUDIO BOARD REMOVAL
3-4.
CASSETTE LID ASSY REMOVAL
7
AUDIO board
2
Remove solder
3
Remove solder
1
Screw (M1.7
× 3)
4
Flexible board
5
6
2
Screw (M1.4
× 2)
5
Cassette lid assy
3
Screw (M1.4
× 2)
1
OPEN button
4