TROUBLESHOOTING GUIDE
SET POWER SWITCH TO ON.
IS POWER TURNED ON ?
YES
CAN TRAY BE OPENED ?
YES
CAN TRAY BE CLOSED ?
YES
NO
NO
NO
CHECK FUSES |
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M507, |
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YES |
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IS THERE OPEN/ CLOSE KEY SIGNAL |
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INPUT ? U401 PIN 66, 65 |
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YES |
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CHECK OPEN/ CLOSE SIGNAL AT U401 |
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| PIN 65 |
| PIN 66 |
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TRAY OPEN |
| H |
| L |
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TRAY CLOSE |
| L |
| H |
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YES |
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IS LOADING MOTOR DRIVE CIRCUIT |
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OPERATION NORMAL ? |
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YES |
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CHECK POWER SUPPLY |
| NO | |
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CIRCUIT NORMAL ? |
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YES |
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IS OSCILLATOR CIRCUIT |
| NO | |
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OSCILLATING ? |
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M101 SWITCH, DEFECTIVE
OR PATTERN AND CONNECTOR OPEN.
MICROPROCESSOR IC U401 DEFECTIVE.
MOTOR DRIVE TRANSISTOR Q104, Q105, Q106, Q107 DEFECTIVE.
POWER SUPPLY PATTERNS OPEN
OR
CRYSTAL X301 DEFECTIVE.
DOES INITIAL READING OCCUR ?
YES
CAN DISC BE PLAYED ?
YES
AUDIO OUTPUT IS CORRECT ?
YES
OK
NO
NO
NO
LOADING MOTOR AND LEAD WIRE DEFECTIVE OR LOADING PART OF MECHANISM DEFECTIVE.
NO
CHECK LASER LIGHT ?
YES
CHECK LASER CIRCUIT CORRECT ?
YES
CONNECTION OR PICKUP DEFECTIVE.
NO
NO
CHECK TRACKING SERVO CIRCUIT CORRECT ?
YES
CHECK DISC OR MECHANISM AND CONNECTOR
NO
IS POWER SUPPLY NORMALLY ?
YES
NO
CHECK CLOCK PULSE AT PIN4 OF U302
YES
NO CHECK OUTPUT PULSE AT PIN 61,62,63 OF U201
YES
NO
CHECK OUTPUT SIGNAL AT PIN 13,16 OF U302
YES
NO
CHECK OUTPUT SIGNAL AT PIN 1,7 OF U305, U306
YES
NO
CHECK MUTE CIRCUIT Q301, Q302, Q303, Q304
YES
LINE OUT PLUG OR PATTERNS DEFECTIVE.
DOES LENS MOVE UP AND DOWN ?
YES
RF SIGNAL OUTPUT ?
YES
FEED MOTOR OR WIRING DEFECTIVE.
U101 DEFECTIVE.
SERVO IC U101 OR U202 DEFECTIVE.
CHECK POWER SUPPLY PATTERNS.
M302 OR U302 DEFECTIVE.
IC U201 DEFECTIVE.
IC U302 DEFECTIVE.
IC U305 OR U306 DEFECTIVE.
MUTE CIRCUIT DEFECTIVE.
NO
U101 DEFECTIVE.
NO
CHECK FOCUS SIGNAL OUTPUT ?
YES
CHECK CONNECTION OR PICKUP.
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