WM-FS420/FS420RS
SERVICE MANUAL
US Model
Canadian Model
Ver 1.0 2000. 02
WM-FS420/FS420RS
AEP Model
E Model
WM-FS420
Model Name Using Similar Mechanism |
NEW |
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Tape Transport Mechanism Type |
MF-WMFS420-114 |
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SPECIFICATIONS
Radio Frequency |
FM : 87.5 – 108 MHz |
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AM : 530 – 1,710 kHz |
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(North, Central and South America) |
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531 – 1,602 kHz (Other countries) |
Power Requirements |
3 V DC Batteries R6 (AA) × 2 |
Dimensions (w/h/d) |
Approx. 108.4 × 125.7 × 47.2 mm |
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(4 3/8 × 5 × 1 7/8 inches) incl. |
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projecting parts and controls |
Mass |
Approx. 280 g (9.9 oz)/Approx. 355 g (12.6 oz) |
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(incl. batteries and a cassette) |
Supplied Accessories |
• Stereo headphones or earphones (1) |
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• Belt clip (1) |
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• Battery charger (1) (FS420RS only) |
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• Rechargeable battery |
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NC-WMAA, 1.2 V, 700 mAh, Ni-Cd (2) (FS420RS only) |
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• Rechargeable battery carrying case (1) (FS420RS only) |
Design and specifications are subject to change without notice.
RADIO CASSETTE PLAYER
TABLE OF CONTENTS
1. GENERAL ·······························································7. MEXPLODED VIEWS
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7-1. Cabinet Assy Section ························ |
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7-2. |
Main Board Section |
2. SERVICE NOTE ···························································· |
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7-3. |
Mechanism Deck Section-1 |
3. DISASSEMBLY |
(MF-WMFS420-114) ························ |
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7-4. |
Mechanism Deck Section-2 |
3-1. Main Assembly ··························································· |
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3-2. |
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(MF-WMFS420-114) ························ |
Chassis Sub Assy ·························································· |
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3-3. |
Main Board and Mechanism Deck ································ 5 |
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3-4. |
8. ELECTRICAL PPARTS LIST |
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Belt ································································ |
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3-5. |
Head, Magnetic (HP901) ··············································· 6 |
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4.MECHANICAL ADJUSTMENT ·································· 7
5.ELECTRICAL ADJUSTMENT ···································· 7
6.DIAGRAMS
6-1. IC Block Diagrams ······················································ 10
6-2. Block Diagram ···························································
6-3. Schematic Diagram ····················································· 13
6-4. Printed Wiring Board ··················································· 15
6-5. IC Pin Function Description ········································ 17
SECTION 1
GENERAL
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.
Flexible Circuit Board Repairing
•Keep the temperature of 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.
This section is extracted from instruction manual.
— 2 —
SECTION 2
SERVICE NOTE
WATER PROOF 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
Tapping screw (B)(1.4 × 4)
Joint (AVLS) Tapping screw (B)(1.4 × 4)
Joint (VOL)
Ring (Dia. 2.5 × Dia. 4.5). O (Apply sony grease: SGL-601)
Knob (Hold)
Ring. O
(Apply sony grease: SGL-601)
Knob (Vol)
— 3 —
SECTION 3
DISASSEMBLY
Note : Disassemble the unit in the order as shown below.
Set |
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Main Assembly |
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Chassis Sub Assy |
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Main Board and Mechanism Deck |
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Belt |
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Head, Magnetic (HP901) |
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Note : Follow the disassembly procedure in the numerical order given.
3-1. MAIN ASSEMBLY
6 Remve the main assembly in the direction |
5 Two screws (+B1.7 × 7) |
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of arrow. |
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(Be careful not to focibly pull the wire that connects |
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the main board and the headphone board.) |
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7 Remove the headphone |
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borad in the direction of arrow. |
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4 Cassette sub assembly, holder
3 Screw, tapping
2 Screw, tapping
1 Stop ring (E 1.2)
CAUTION WHEN ASSEMBLING THE MAIN ASSEMBLY
• Assemble the main assembly in a way that each switch mates with the corresponding knob each other.
POWER switch (S303) |
DIR switch (S301) |
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DX/LOCAL switch (S304)
Volume (RV301)
— 4 —
3-2. CHASSIS SUB ASSY
Main board
2 Knob (DX-Local)
1 Two claws
3 Chassis sub assy
3-3. MAIN BOARD AND MECHANISM DECK
4 Main board
3 Screw (M1.4 ) Toothed Lock
2 Remove the solder
1 Remove the solder (fouf points)
5 Stopper (MD)
6 Mechanism deck
— 5 —
3-4. BELT
Belt
Belt threading
Capstan wheel assy(SP) Reel/Capstan motor
Belt |
Capstan wheel assy(SP) |
3-5. HEAD, MAGNETIC (HP901)
1 Two screws (M1.4)
2 Head, magnetic (HP901)
— 6 —
SECTION 4
MECHANICAL ADJUSTMENT
PRECAUTION
1.Clean the following parts with a denatured-alcohol-moistened swab:
playback head |
pinch roller |
rubber belts |
capstan |
2.Do not use a magnetized screwdriver for the adjustments.
Torque Measurement
Mode |
Torque Meter |
Meter Reading |
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FWD |
CQ-102C |
20 to 42 g•cm |
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(0.27 to 0.58 oz•inch) |
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FWD |
CQ-102C |
More than 2.0 g•cm |
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Back Tension |
(More than 0.027 oz•inch) |
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FF, REW |
CQ-201B |
More than 50 g•cm |
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(More than 0.69 oz•inch) |
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SECTION 5
ELECTRICAL ADJUSTMENT
TAPE SECTION |
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0 dB = 0.775 V |
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Test Tape |
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Tape |
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Signal |
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Used for |
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WS-48A |
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3 kHz, 0 dB |
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Tape speed adjustment |
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Tape Speed Adjustment |
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Procedure: |
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Mode: Playback |
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Test tape |
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WS-48A |
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digital frequency |
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(3 kHz, 0 dB) |
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counter |
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16 Ω |
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Set
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J301 (phones)
Adjustment Value: normal tape speed
Adjust the tape speed adjustment RV601, so that the freqency counter reading becomes 3,000Hz.
Specification Value:
Digital frequency counter
2,970 to 3,030 Hz
Frequency difference between the beginning and the end of the tape should be within 1.5 % (45 Hz).
Adjustment Location:
RV601
— 7 —
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