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

• READING OK CHECK #B(="NO DISC" DISPLAY)
B
DOSE FA+ WAVEFORM
APPEAR AT(IC503 PIN 1 5 AND
PN50 1 PIN 16)WAVEFORM #3
FOCUS COIL DRIVE WAVE
YES
CHECK PN50 1 CONNECTOR LINE
NO
DOSE FAIN WAVEFORM
APPEAR AT (IC503 PIN26)
WAVEFORM #3 FOCUS
DRIVE WAVE
NO
NO
- 2-7 -
NO
DEFECTIVE IC50 1
NO
DEFECTIVE IC503
DEFECTIVE PN501
CONNECTOR
DEFECTIVE PICUP
FOCUS ACTUATOR