LG LM-M540 Service Manual page 20

READING OK CHECK #C (= "NO DISC" DISPLA)
C C C C C C C C
IS ?V APPLIED TO PIN10 OF
PN801
LASER SUPPLY VOLTAGE CHECK
YES
CHECK PN801 CONNECTOR LINE
NO
IS 3.3 V APPLIED TO
PIN3 OF IC802
RF IC SUPPLY VOLTAGE
CHECK
IS 2.0 V PIN2 OF IC802
LASER CONTROL
VOLTAGE CHECK
NO
NO
- 2-16 -
NO
DEFECTIVE IC805
NO
DEFECTIVE IC802
NO
DEFECTIVE Q801 OR
DEFECTIVE PN801
CONNECTOR
DEFECTIVE PICKUP
LASER PART
D811