General Maintenance
Table 4: Symptoms and causes (cont.)
Symptom
Possible sources or recommended detailed troubleshooting procedure to follow
Functional Test Failures
Performance Veri
fi
cation Test Failures
In case of failure on either Functional or the Performance tests, the board at fault is
generally obvious. Before replacing a board:
1. Perform the primary and secondary power supply checks.
2. Run the advanced diagnostics and check the diagnostic log for help in isolating the
fault.
If this does not isolate the problem, then replace the main board if the test is in one of
the following areas:
SDI
Composite
Ref
LTC
XGA output
Color Palette
Remote I/O
Ethernet
If the problem is only the SDI input,
fi
rst replace the SDI or Eye board (depending on
option). If that does not
fi
x the problem replace the main board.
If the problem is Composite, replace the composite option board. If the problem persists
then replace the main board.
If the problem is in the audio board,
fi
rst check the diagnostic log for audio power-up
self test failures or audio DSP programming failures. If the problem persists, replace
the audio board.
Unknown Problems
An instrument may come into service
with vague or intermittent symptoms.
In a case like this, the following set of
tests may help
fi
nd the problem or the
marginal condition.
1. Check the diagnostic log. This log records a variety of problems and will enable you to
see messages for an error that may not be currently happening.
2. Check the power supplies by performing the Primary and Secondary Supply checks. A
marginal supply can lead to intermittent operation if it is near the acceptable threshold.
This includes the main supply and the secondary supplies on each board.
3. Perform the incoming inspection tests. This will exercise a majority of the functions
in the unit and includes the advanced diagnostics. Some parts of the test may not be
necessary for all problem areas.
4. If the unit has an audio board, remove it and recheck any problem areas in the video
performance. The Audio board can place too much of a load on the supplies if they are
marginal. If the performance changes with the audio board removed, then you should
perform the primary and secondary power supply checks and look for an excess load
on one of the supplies.
WVR7200 Waveform Rasterizer Service Manual
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