General Maintenance
Table 4-4: Symptoms and causes (cont.)
Symptom Possible Sources or Recommended Detailed Troub lesho oting Procedure to follow
Failures while running the
advanced diagnostics:
Display Data Bus
Display Address Bus
Raster Data Bus Input
DSP1 Data Bus
DSP1 Address Bus
DSP2 Data Bus
DSP2 Address Bus
DSP1 QDR1
DSP1 QDR2
DSP2 QDR1
DSP2 QDR2
RD SDRAM Data
RD SDRAM Address
DSP1 SDRAM Data Bus
DSP1 SDRAM Address Bus
DSP2 SDRAM Data Bus
DSP2 SDRAM Address Bus
Audio PLL Ctrl Outs
Audio PLL Freq Check
Perform secondary power supply checks
Replace main board
WFM6120, WFM7020, and WFM7120 Waveform Monitors Service Manual 4–9
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