Sdram Clock; Tray Open/Close Signal - Zenith DVB413 Service Manual

2. SDRAM CLOCK

1) SDRAM clock is at 135MHz

3. TRAY OPEN/CLOSE SIGNAL

1) Tray open/close waveform
CLK=135MHz,Vp-p=3.3V
FIG 2-1
OPEN
FIG 3-1
3-12
IC503 PIN38
OPEN(CN203 PIN3)
CLOSE(CN203 PIN4)
LM-(IC201 PIN14)
LM+(IC201 PIN13)
CLOSE