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(2) If initial reading is not carried out(with Disc)
Dose disc motor rotate?
YES
NO
Is HF wave-
form output?
IC601 pin 2
Is rotation normal?
Is there any irregularity in
frequency?
YES
Is HF signal normal without
dropout?
YES
NO
Is IC201 Pin42 output
waveform normal?
Door open
NO
Is tracking servo
operating?
Is the lower IC601
pin2 waveform flat?
3~4V
0V
YES
Is signal output at tracking output IC603
pin26 ,27 ?
NO
Dose IC601 pin20 (LOCK) as figure?
NO
LOW
Door close
YES
Dose laser light?
YES
Is signal output at
IC601 pin29
YES
- 2-4 -
NO
• Limit SW contact defective.
• Connector depective.
• Patter short.
NO
A
B
NO
Is TER signal
output at IC601
pin34 ?
YES
NO
NO
• Disc initial reading
damaged defective.
• Pick up defective.
• IC 601
NO
defective.
• Connector
defective.
• Pick up
defective
• Pattern
defective.
• IC 603
defective.
• Pick up
defective
• Connector
defective.
• IC 601
defective.
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