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

• READING OK CHECK #A(="NO DISC" DISPLAY)
A
DOSE SL+ WAVEFORM
APPEAR AT(IC503 PIN 14 AND
PN503 PIN3)WAVEFORM #2
SLED MOTOR WAVE
YES
CHECK PN503 CONNECTOR LINE
NO
DOSE SLIN WAVEFORM
APPEAR AT (IC503 PIN5)
WAVEFORM #2 SLED
DRIVE WAVE
NO
NO
- 2-6 -
NO
DEFECTIVE IC501
NO
DEFECTIVE IC503
DEFECTIVE PN503
CONNECTOR
DEFECTIVE PICUP
SLED MOTOR