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Troubleshooting the Analyzer
To troubleshoot source and calibrator out failures
8 Check DAC signals.
a Press the following keys:
[Preset]
[
Source]
[
source on]
b Using a logic probe, check that the TTL signals listed in the
following table are toggling.
c If any of the signals are incorrect, the A30 Digital Source assembly
is probably faulty.
d If the signals are correct, the A35 Analog Source assembly is
probably faulty. Before replacing the A35 Analog Source
assembly, go to page 1-15, ‘’To troubleshoot the power supply,’’
and do Step 7 to check the -8 V power supply.
Test Location Signal Name
A91 J6 pin 4A DAC[0]
A91 J6 pin 4C DAC[1]
A91 J6 pin 5B DAC[2]
A91 J6 pin 6A DAC[3]
A91 J6 pin 6C DAC[4]
A91 J6 pin 7B DAC[5]
A91 J6 pin 8A DAC[6]
A91 J6 pin 8C DAC[7]
A91 J6 pin 9B DAC[8]
A91 J6 pin 10A DAC[9]
A91 J6 pin 10C DAC[10]
A91 J6 pin 11B DAC[11]
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