Installation guide

Troubleshooting
Troubleshooting Performance Test Problems
1-92
Table 1-40 Troubleshooting Performance Test Problems
Performance test that is failing... Action to perform...
Internal AM Accuracy
This is part of the Internal AM Accuracy and
Distortion performance test.
Note
When a performance test fails and all
self-tests have passed, use this table to
locate the most likely cause. These
performance tests are listed in the
order that they should be performed to
minimize changes in test equipment
configurations.
•Perform:
— Internal Source Calibration
— All AM Adjustments
• If still failing and:
— problem is at carrier frequencies ≤ 4GHz,
troubleshoot the following assemblies:
— A18 Reference
— A13 Output
— A23 Motherboard
— problem is only at carrier frequencies > 4GHz,
troubleshoot the following assemblies:
— A14 Extended Frequency Output (Option 506)
Internal FM Accuracy
This is part of the Internal FM Accuracy and
Distortion performance test.
•Perform:
— Internal Source Calibration
— KV versus Frequency Calibration
— All FM adjustments
• If still failing, troubleshoot the following assemblies:
— A17 Synthesizer (Option 501, 502, 503, 504)
or A16 Frac-N (Option UNJ or Option 506)
— A18 Reference
— A23 Motherboard
Internal PM Accuracy
This is part of the Phase Modulation
Accuracy and Distortion performance test.
•Perform:
— Internal FM Accuracy and Distortion
• If still failing, troubleshoot the following assemblies:
— A17 Synthesizer (Option 501, 502, 503, 504)
or A16 Frac-N (Option UNJ or Option 506)
— A18 Reference