LG FFH-3765MVA Service Manual page 13

C
YES
Is RFO signal output?
IC501 Pin .
16
YES
Is FZC signal output at IC501
Pin ?
82
FER
ISTAT(SENSE)
YES
Is MDP signal outut by IC502
Pin ?
95
YES
Has voltage at disc motor?
at start
YES
• IC501 defective.
NO
• Pick-up defective.
• Connector defective.
NO
• IC502 defective.
NO
• IC502 defective.
NO
• IC501, 502 defective.
• Surrounding circuitry defective.
• Disc Motor defective.
• Connector defective.
- 2-7 -
When FOK focus
Servo Conform by
FZC signal