8. If the voltage changes incorrectly, proceed as follows:
a. Check the -10
Vdc reference (A3U409 pin 4).
b. While using the front-panel knob to adjust the video trigger level, check for the presence
of pulses on
A3U409 pin 15 (LDAC2).
c. While using the front-panel knob to adjust the video trigger level, check for the presence
of pulses on
A3U409 pin 16 (LWRCLK).
d. Check that pulses are present on
U409
pin 6 (IAO).
9. If the LWRCLK and LDAC2 signals are not correct, refer to “Interface Strobe Select” in
this chapter.
7-10
ADC/lnterface
Section
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