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Troubleshooting the Analyzer
To troubleshoot auto-range failures
2 Check the channel 1 auto-range signals.
a Place the analyzer on the side closest to the display.
b Remove the bottom cover.
c Press the following keys:
0
[
dBm]
[
Marker/Entry]
d Using a BNC cable, connect the SOURCE output to CHANNEL 1
input.
e Using a logic probe, check the TTL signals listed in the following
table. Rotate the RPG knob to change the source’s amplitude to
an under-range and over-range condition.
f Press the following keys:
[
Range]
[
ch1 autorange up-down]
[
Source]
g Rotate the RPG knob until the analyzer changes its range.
When the analyzer changes its range, the signals in the above table
should toggle.
h If the analyzer does not have the optional second channel and the
signals are correct, the A30 Digital Source assembly is probably
faulty.
Test
Location
Signal
Name
Input
Range
Correc
t
Input Under
Range
(<-10 dBm)
Input Over
Range
(>+6 dBm)
Probable
Faulty
Assembly
A91 P1 pin 47 nOVRRNG1 High High Low A36 Trigger
A91 P1 pin 48 nHLFRNG1 Low High Low A36 Trigger
A91 J2 pin 11B nADCOVR1 High High Toggling A21 A/D Converter
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