LG HT903WA Service Manual page 23

2. SDRAM CLOCK
1) ES8391 main clock is at 27MHz(X501)
DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V
3. TRAY OPEN/CLOSE SIGNAL
1) Tray open/close waveform
OPENSW(
CLOSESW
CLOSE
LGE Internal Use Only
FIG 2-1
OPEN
FIG 3-1
1
2) Tray close waveform
1
2
3
4
2-14 Copyright © 2008 LG Electronics. Inc. All right reserved.
1
OPENSW
CLOSESW
OPEN
CLOSE
FIG 3-2
Only for training and service purposes
1
2
3
4