LG LH-W551TB Service Manual page 35

3) Tray open waveform
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)
FIG 3-3
FIG 4-1
3-12
OPEN(PDM03 PIN7)
CLOSE(PDM03 PIN8)
TROPEN(IC402 PIN 4)
TRCLOSE(IC402 PIN 5)
FMSO(2.0V/1.4V/1.0V)
(IC501 PIN 19)
STBY(5V) – (IC401 PIN 50)
SL+(4.7V/3.6V/1.9V)
(IC404 PIN 12)
SL-(5.3V/3.7V/2.5V)
(IC404 PIN 11)