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4 MHz Check
1. Switch off the analyzer.
2. Remove the A10 board and install it onto the extender board.
3. Use an oscilloscope to observe the 4 MHz signal at AlOP pin 6.
If the 4 MHz sine wave signal is present at AlOP pin 6, replace AlO.
n
If the 4 MHz signal is not present at A12P2 pin 36, replace A12.
q
If the 4 MHz signal is present at Al2 (but not AlO), check the
q
motherboard trace.
At Least One Signal Path Looks Normal
One normal signal path indicates that at least one sampler, one 2nd converter,
troubleshooting approach. If two signal paths are abnormal, repeat the steps of
this section for each suspect signal path.
1.
2.
Press 1presetl?~~.~'~~~~~~ m 'I@~ PtJgT$ and i or 4
i . .
3.
connect a short to port 2. Then press IPreset MESET: F%!T&T (Meas)
4.
Refer to Figure 8-1 to determine if the signal path trace is normal for the HP
appear to be reduced by approximately 15 dBm. Further increase in power (5
Even if the R signal path trace is abnormal, the R sampler is nonetheless
n
good (or there would be a phase lock problem). Go directly to "2nd
Converter Check. n
. . . . . .
Receiver Troubleshooting 8-3
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Table of Contents
Troubleshooting
