E8257D/67D, E8663D PSG Signal Generators Service Guide 21
Troubleshooting
Getting Started with Troubleshooting
Running Self–Test
1. On the instrument front panel, press the Utility hardkey.
2. Select the following softkeys:
a. Instrument Info/Help Mode
b. Self Test
c. Run Complete Self Test
3. When the Self–Test finishes, one of the following messages displays:
— If the Self Test passed: “The current status of self test is: Success All
self tests have passed.”
— If the Self–Test failed: “The current status of self test is: Failed.” The
message also reports the most independent failure.
4. If the Self–Test failed, look up the reported most independent failure in the
“Self–Test Failures and Related Troubleshooting” section on page 25.
5. Troubleshoot and repair the most independent failure.
6. After you replace the failed assembly, run the Self–Test again.
7. If another assembly is reported as the most independent failure, repeat
steps 4 thru 6 until the Self–Test passes.
A bad assembly can cause other assemblies to fail. The internal failure tree will
identify the most likely failed assembly and report it as the “most independent
failure.” Troubleshoot and replace that assembly before troubleshooting and
replacing other assemblies.
When you replace an assembly a good assembly will pass self–test without any
adjustments.
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