Sdram Clock; Tray Open/Close Signal - Zenith XBV613 - DVD/VCR Combination Service Manual

2. SDRAM CLOCK

1) SDRAM clock is at 143MHz

3. TRAY OPEN/CLOSE SIGNAL

1) Tray open/close waveform
CLK=143MHz,Vp-p=3.3V
FIG 2-1
OPEN
FIG 3-1
3-66
IC603 PIN38
OPEN
CLOSE
LM-
LM+
CLOSE