Sony WMFS-473 Service manual
WM-FS473
SERVICE MANUAL
Ver 1.0 1998. 05
SPECIFICATIONS
Frequency range FM : 87.5 – 108 MHz
AM : 530 – 1710kHz
(US, Canadian model)
531 – 1602kHz (AEP, E model)
Power requirements 3V DC batteries (AA) R6 x2
Dimensions 104.2 x 127.3 x 51.8 mm (4 1/
(w/h/d) incl. projecting parts and controls
Mass Approx. 260g (9.2 oz)
Approx.340g (12 oz) incl. batteries and a cassette
Supplied accessory Stereo headphones or Stereo earphones (1)
US Model
Canadian Model
AEP Model
E Model
Model Name Using Similar Mechanism NEW
T ape Transport Mechanism T ype MF-WMFS473
8
8
x 21/
8
inches)
x 51/
Design and specifications are subject to change without notice.
RADIO CASSETTE PLAYER
MICROFILM
TABLE OF CONTENTS
Specifications ........................................................................... 1
1. GENERAL
Location of parts and controls............................................ 2
2. SERVICE NOTE........................................................... 3
3. DISASSEMBLY
3-1. Cover Removal ........................................................... 4
3-2. Display Board Removal ............................................. 4
3-3. Cassette Lid Assy Removal ........................................ 5
3-4. Chassis section, Headphone Jack Board Removal ..... 5
3-5. Mechanism Deck, Main Board, Belt Removal........... 6
4. ADJUSTMENTS
4-1. Mechanical Adjustments ............................................ 7
4-2. Electrical Adjustments................................................ 7
5. DIAGRAMS
5-1. Explanation of IC Terminals..................................... 10
5-2. Block Diagram...........................................................11
5-3. Printed Wiring Boards (Main Section) ..................... 13
5-4. Schematic Diagram (Main Section) ......................... 15
5-5. Schematic Diagram (Display Section) ..................... 18
5-6. Printed Wiring Boards (Display Section) ................. 21
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.
6. EXPLODED VIEWS
6-1. Cassette Lid Section ................................................. 23
6-2. Main Board Section .................................................. 24
6-3. Mechanism Deck Section (MF-WMFS473) ............ 25
7. ELECTRICAL PARTS LIST................................... 26
SECTION 1
GENERAL
This section is extracted from
instruction manual.
– 2 –
SECTION 2
SERVICE NOTE
WATERPROOFED SECTION
Note : In case the parts in the figure are removed for repair, treat them to protect from water drop following the instructions in the figure
(spread grease, bond etc.)
• Sony grease SGL-601 : 7-651-000-10
A
Paking (cabinet)
Set the A positions to corner.
A
then push down to grove.
Note : Clean the attachement portion
and shaded area with cloth.
Cabinet (rear) assy
Cassette lid assy
Screw
Joint (VOL. B)
– 3 –
O ring
(Apply sony grease SGL-601)
Knob (VOL)
SECTION 3
y
DISASSEMBLY
r
The equipment can be remo ved using the f ollo wing pr ocedure .
Set
Note : Follow the disassembly procedure in the numerical order given.
3-1. COVER REMOVAL
Cover
Diaplay board
Cassette lid assy
Chassis section, Headphone jack board
Mechanism deck, Main board, Belt
3
Claws
3-2. DISPLAY BOARD REMOVAL
Cassette lid assy
4
Cover
1
Backle
2
Arm ass
5
Screws
2
Screws
Display board
3
Cassette lid assy
1
Flexible board
– 4 –
3-3. CASSETTE LID ASSY REMOVAL
2
Screw
3
Cassette lid assy
2
Screw
1
Flexible board
3-4. CHASSIS SECTION, HEADPHONE JACK BOARD REMOVAL
1
Screws (+P 2x12)
Chassis section
Headphone jack board
Cabinet (rear) assy
4
3
Note : When install the c hassis section
1. T urn R V301 full y to arr ow direction.
2. T urn knob (V OL) full y to arr ow direction.
3. Fit RV301 to hole of knob (V OL) and then
install the chassis section.
RV301
Main board
1
3
Cabinet (rear) assy
Knob (VOL)
2
2
Claws
– 5 –
3-5. MECHANISM DECK, MAIN BOARD, BELT REMOVAL
k
3
Claw
6
2
Screws (2x5)
3
Claw
Chassis
3
Claw
8
7
Belt
9
1
Remove
solder
Main board
Red
4
Gray
5
Screw
Mechanism dec
Black
Red
Orange
Black
White
– 6 –
Loading...