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Troubleshooting
Failing Parts or Assemblies: The check procedures
generally help you trace a problem to one part or assembly.
The last step of the specific check procedure you are using
indicates that a part or assembly is failing. You should inspect
the part or assembly before you decide to replace it. It might
be loose, dirty, or in need of a small repair. The check
procedures might lead you to two, or even three, possible
failing parts or assemblies. The parts that might be failing are
listed in order of the most probable failure. Also, the FRU
parts are defined as replaced units and are not repaired in the
field.
Measuring Voltages: Some check procedure steps instruct
you to measure voltages on cable plugs and electronic board
connectors. If you are asked to measure voltage at several
places on a plug or connector, a chart next to or near the
instruction indicates the number of the plug or connector, the
pin numbers you should measure, the signal name, and the
correct voltage for the condition you are measuring. Measure
the voltage only at the pins listed in the chart. Remember to
set the meter on the correct scale and to put the meter leads
in the correct position for the voltage you are asked to
measure.
NOTE: Use frame ground as the ground reference. Attach
the black (ground) lead of meter to frame ground,
except where specified otherwise.
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