Sdram Clock; Tray Open/Close Signal - Zenith DVB352 Series Service Manual

2. SDRAM CLOCK

1) MT1379 main clock is at 27MHz(X501)
DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V
(IC502,IC503 PIN 35)
FIG 2-1

3. TRAY OPEN/CLOSE SIGNAL

1) Tray open status waveform
MODE1(OPEN)
MODE2(CLOSE)
MODE3(CHECK)
TROPEN
FIG 3-1
3-12