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Troubleshooting the Analyzer
To troubleshoot two channel analyzer failures
operating correctly. This is caused by the ADC dither function.
The noise floor should settle after about 3 minutes and should
not affect the self-test results.
3 Step 3. Exchange channel 1 and channel 2 A/D Converter assemblies,
then check for failing tests.
a Set the power switch to off ( O ).
b Exchange the channel 1 A21 A/D Converter assembly with the
channel 2 A/D Converter assembly.
c Reconnect the cables as follows:
Channel 1: A10 J2 to A21 J4
A10 J3 to A36 J2
A21 J1 to A60 J3
Channel 2: A10 J2 to A21 J4
A10 J3 to A36 J5
A21 J1 to A60 J2
d Set the power switch to on ( l ).
e Press the following keys:
[
System Utility]
[
auto cal off]
[
more cal setup]
[
auto zero cal off]
[
Return]
[
more]
[
diagnostics]
[
service functions]
1125
[
enter]
[
test log]
[
Return]
[
functional tests]
[
ADC]
(wait for test to finish)
[
more]
[
input]
(wait for test to finish)
[
calibration]
f If the channel that failed before the exchange still fails, the A10
Analog Input assembly in the failing channel is probably faulty.
g If the other channel now fails, the A21 A/D Converter assembly in
the failing channel is probably faulty.
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