General Maintenance
Detailed Troubleshooting Procedures
The following tests should be run as indicated in the Symptom and Causes
table above. The procedures check for specific problems or will help you
isolate a problem to a board. You can run them at any time for informational
purposes but if you do not run the procedures in the correct context, then the final
recommenda
tion identifying a root cause might be suspect.
List of detailed troubleshooting procedures:
General Checks
Fault LED Problem Isolation
Primary Power Supply Checks
Secondary Power Supplies Checks
Front P a
nel Troubleshooting
Isolating Audio Problems
Isolating Advanced Diagnostic Lissajous Errors.
General Checks
Check that the power cord is installed.
1. Check that the XGA monitor cable is connected on both ends and that the
screws are holding it securely.
2. Check t hat all internal cables are correctly connected and seated.
3. Che
ck for any discolored or burned components.
Fault LED Problem
Isolation
The waveform rasterizer has a red FAULT LED on the front panel. This indicator
lights up when specific types of problems occur in the instrument. The FAULT
LE
D is different from the error icon on the XGA display, which indicates a
problem with the signals. It is normal for the FAULT LED to be lit for 10 to
15 seconds during boot up.
The fault system is simple and does not require the processor be running to
indicate faults. However, the fault system does not cover everything and does not
give full details about the nature of the fault. Note that some problems that are
covered by the FAULT LED are also reported to the diagnostic log.
If the instrument runs sufficiently to access the CONFIG menu, then check the
diagnostic log for messages about the cause of the fault. Skip directly to that
portion of this section if such information is available.
WVR6020, WVR7020, and WVR7120 Waveform Rasterizers Service Manual 4–11
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