General Maintenance
Table 4-4: Symptoms and causes (cont.)
Symptom Possible Sources or Recommended Detailed Troubleshooting Procedure to follow
Failures while running the
advanced diagnostics (Cont):
DSY → DSP1 Bus Output
DSY → DSP1 B us Input
DSP1 → DSY Bus O utput
DSP1 → DSY Bus Input
DSY → DSP2 Bus Output
DSY → DSP2 B us Input
DSP2 → DSY Bus O utput
DSP2 → DSY Bus Input
DSP1 → DSP2 Bus Output
DSP1 → DSP2 B us Input
DSP2 → DSP1 Bus Output
DSP2 → DSP1 B us Input
Perform secondary power supply checks
Replace main board
Failures while running the
advanced diagnostics (Cont)
Eye Option Data Bus
Power A/D
Eye Capable A/D
Eye → DSP1 Data
Eye → DSP1 Phase
Eye → DSP2 Data
Eye → DSP2 Phase
Eye Option
Replace the eye board
NOTE. It is also possible that the Eye to DSP tests could indicate a problem in the Main board.
Failures while running the
advanced diagnostics (Cont)
Lissajous B us
Review messages in the diagnostic log. If the wav eform monitor also fails other tests as well,
then suspect main board and perform the primary and secondary power supply tests.
If only this test fails, then perform the Isolating Advanced Diagnostic Lissajous Errors procedure
to isolate the problem to main or audio board.
4–10 WFM6120, WFM7020, and WFM7120 Waveform Monitors Service Manual
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