Reading Ok Check #E(=“No Disc” Display) - LG LPC-LM340X Service Manual

• READING OK CHECK #E(="NO DISC" DISPLAY)
E
DOSE TA+ WAVEFORM
APPEAR AT(IC503 PIN17 AND
PN503 PIN 15)WAVEFORM #5
TRACKING COIL DRIVE WAVE
YES
CHECK PN503 CONNECTOR LINE
YES
DOSE ARF SIGNAL APPEAR?
(IC502 PORT8)
WAVEFORM#6
YES
DOSE FE, TE SIGNAL APPEAR?
(IC502 PORT FE:23,RE:21)
WAVEFORM#6
NO
DOSE TAIN WAVEFORM
APPEAR AT (IC503 PIN23)
WAVEFORM #5
TRACKING DRIVE WAVE
NO
NO
NO
NO
- 2-10 -
NO
DEFECTIVE IC501
NO
DEFECTIVE IC503
DEFECTIVE PN503
CONNECTOR
DEFECTIVE PICKUP OR
IC502
DEFECTIVE PN503
CONNECTOR
DEFECTIVE PICUP
SPINDLE MOTOOR