General Maintenance
the voltage on t
he LED. If the LED is bad replace it, otherwise replace the
front panel board.
10. The FAULT LED s
hould b e lit at power up for a bout 10 seconds. It should
also be lit if either fan is stopped. If it is not lit at power up or when a fan is
stopped, then check the voltage on the LED. The cathode connects to a 332
ohm resistor tied to ground and the anode connects to the output of a logic
gate. If the voltage looks correct, then replace the LED, otherwise replace
the front panel board.
11. If the buttons and LEDs work but knobs do not work, then replace the front
panel.
12. If the buttons and LEDs work but the beeper does not sound, then replace
the front panel board.
13. Check fuse F970 if the remote front panel is not functioning.
AudioPOSTFailure
It is sometimes difficult to isolate the root cause of a udio problems. Most audio
problems are due to faults on the audio board, but the audio board communicates
with the main board, so in some cases the problem may be there as well. This
test isolates an audio POST failure to either the audio board, main board, or the
cable
between.
Not all errors are reported by the power up diagnostics; therefore, if you are
dete
cting a loss in audio functionality, check the diagnostic log for any reported
audio errors. If any errors are found, perform the following procedure to narrow
the problem to either the audio board or the main board.
WVR6020, WVR7020, and WVR7120 Waveform Rasterizers Service Manual 4–17
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