General Maintenance
board. If the si
gnals do toggle, check them again on the audio board J200.
If any of the signals on the pins do not toggle on the audio board, replace
the cable.
8. Probe pin 27 on the audio board connector J200. If the signal on the pin does
not toggle, replace the audio board; otherwise, check it again on the main
board connector J750. If the signal on pin 27 does not toggle on the main
board, then replace t he ca ble; otherwise, replace the main board.
9. If all of these steps p ass, replace the audio board.
Isolating Advanced
Diagnostic Lissajous
Errors
The advanced diagnostics test the lissajous data path between the audio and main
boards. A failure in this data path can be due to problem o n either board. Perform
the following tests to isolate the problem to one board or the other.
If the advanced diagnostics detect an error in the Lis sajous circuitry, then they
will display a failure in the following categories:
Lissajous Frequency : should be 61.44 MHz ±0.1 Mhz
Lissajous Bus V2 : pass/fail
4–20 WVR6020, WVR7020, and WVR7120 Waveform Rasterizers Service Manual
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