Sony WM-PA1 Service Manual
WM-PA1
SERVICE MANUAL
SPECIFICATIONS
Radio Section
FM :87.6 – 108MHz
AM :530 – 1,710kHz
E Model
Model Name Using Similar Machanism WM-FX123
T ape Transport Mechanism T ype MF-WMFX103-48CY
Power Requirements
3V DC Batteries AA (R6) x 2
External DC 3V power sources
Battery Life
(approximate hours when using the batteries specified below)
Battery Playback Radio
Sony Alkaline LR6 (SG) 16 hours 48 hours
Sony R6P (SR) 4.5 hours 16 hours
Dimensions
94.2x 119.0 x 36.0 mm
Mass
260g incl. batteries and tape
Supplied Accessories
• Stereo headphones (1)
• Belt clip (1)
Design and specifications are subject to change without notice.
MICROFILM
RADIO CASSETTE PLAYER
TABLE OF CONTENTS
mark
mark
CF2
X2
Specifications ........................................................................... 1
1. GENERAL
Location and Function of Controls .................................... 2
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.
2. DISASSEMBLY
2-1. Cabinet (Rear) Removal ............................................. 3
2-2. Cabinet (Front) Removal ............................................ 3
2-3. Main Board, Mechanism Deck Removal ................... 4
2-4. Cassette Holder Sub Assy Removal ........................... 4
2-5. Switch board Removal ............................................... 5
2-6. Dial Pointer Setting .................................................... 5
3. ADJUSTMENTS
3-1. Mechanical Adjustment .............................................. 6
3-2. Electrical Adjustment ................................................. 6
4. DIAGRAMS
4-1. Block Diagram............................................................ 8
4-2. Printed Wiring Boards .............................................. 10
4-3. Schematic Diagram................................................... 15
5. EXPLODED VIEWS
5-1. Cabinet and Board Section ....................................... 19
5-2. Mechanism Deck Section ......................................... 20
6. ELECTRICAL P ARTS LIST ................................21
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.
• HOW TO CHANGED THE CERAMIC FILTERS
This model is used two ceramic filters of CF2 and X2.
Y ou must used same type of color marked ceramic filters in order
to meet same specifications.
Therefore, the ceramic filter must changed two pieces together
since it's supply two pieces in one package as a spare parts
Mark Center Frequency
red 10.70MHz
blue 10.67MHz
orange 10.73MHz
black 10.64MHz
white 10.76MHz
LOCATION AND FUNCTION OF CONTROLS
••
NORM LIMIT
AVLS
SPEAKER
SWITCH
SPEAKER
DC IN 3V
SECTION 1
GENERAL
VOLUME
2
TUNING
p
0 )
••
NORM CrO
METAL
DX LOCAL
FM AM TAPE
(RADIO OFF)
2
/
PLAY
– 2 –
SECTION 2
DISASSEMBLY
r
The equipment can be removed using the following procedure.
Set
Cabinet (Rear)
Cabinet (Front)
Note : Follow the disassembly procedure in the numerical order given.
2-1. CABINET (REAR) REMOVAL
1
Main board, Mechanism deck
4
Cassette holder sub assy Switch board
Cassette holder sub assy
2
2
3
3
2-2. CABINET (FRONT) REMOVAL
7
7
7
4
7
7
Cabinet (Rear)
6
6
6
5
8
1
Flexible board
2
Cabinet (Front)
– 3 –
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