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Troubleshooting the Analyzer
To troubleshoot trigger failures
To troubleshoot trigger failures
Use this test when the trigger function is suspected of failing and the
following self tests passed:
● Digital Source
● Digital Filter
● ADC
1 Check the trigger calibration signal.
a
Set the power switch to on ( l ).
b When the power-up tests are finished, press the following keys:
[ Preset]
[
System Utility]
[
auto cal off]
[
more cal setup]
[
auto zero cal off]
[
Return]
[
more]
[
diagnostics]
[
service functions]
1125
[
enter]
[
special test modes]
[
cal]
[
cal signal on]
c Place the analyzer on the side closest to the display.
d Remove the bottom cover.
e Set the oscilloscope as follows:
CH1 V/div 200 mV/div
Input Impedance 1 M
Ω
CH1 Coupling dc
Time/div 500 ns/div
Probe Atten 1
f Using a high impedance 1:1 oscilloscope probe, check that A91 J6
pin 25B is a 1±0.1 Vp-p square wave.
g If the signal is incorrect, the A35 Analog Source assembly is
probably faulty.
h Return the analyzer to its normal position.
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