LG FFH-M217X Service Manual page 24

READING OK CHECK #E (= "NO DISC" DISPLAY)
E
DOES TA+ WAVEFORM APPEAR
AT
( IC503 PIN17 AND PN503 PIN15)
WAVEFORM #5
TRACKING COIL DRIVE WAVE
CHECK PN503 CONNECTOR LINE
DOES ARF SIGNAL APPEAR?
(IC502 PORT 8)
WAVEFORM #6
DOES FE, TE SIGNAL APPEAR?
(IC502 PORT FE:23, TE:21)
WAVEFORM #6
DOES TAIN- WAVEFORM
APPEAR AT
( IC503 PIN 23)
WAVEFORM #5
TRACKING DRIVE WAVE
- 2-17 -
DEFECTIVE IC501
DEFECTIVE IC503
DEFECTIVE PN503
CONNECTOR
DEFECTIVE PICKUP OR
IC502
DEFECTIVE PICKUP OR
IC502
DEFECTIVE IC501