LG DK7711PM Service Manual page 22

2) Tray close waveform
3) Tray open waveform
FIG 3-2
FIG 3-3
3-14
OPEN((CN203 PIN 3)
CLOSE(CN203 PIN 2)
TROPEN(IC202 PIN 1)
TRCLOSE(IC202 PIN 2)
OPEN((CN203 PIN 3)
CLOSE(CN203 PIN 2)
TROPEN(IC202 PIN 1)
TRCLOSE(IC202 PIN 2)