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6.1
GENERAL
SECTION VI
TROUBLESHOOTING
The troubleshooting section has been divided into two basic tables
and a paragraph on checking SCR's.
Only trained and qualified
electronics or electrical personnel should be allowed to trouble-
shoot this equipment, due to the dangers involved in having to
bypass the interlock safety devices for tip OWER ON" measurements.
It is recommended from a safety standpoint, that the equipment be
turned off, the test equipment connections be made, and the power
applied for the measurement, and the equipment then be turned off
again, prior to disconnecting the test equipment.
Fast, efficient troubleshooting of the drive system is based on a
thorough knowledge of the theory of operation.
During trouble-
shooting, when a card or subassembly is found or suspected of being
bad, it is recommended that prior to replacing the card/subassembly,
the inputs be checked for proper values.
This will exclude the
chance of further damage to the replacement item, due to causes be-
yond the suspected item.
6.1.1
Troubleshooting - Startup
Table 6-1 provides a one-to-one correlation with the startup
sequence.
In the left-hand column under indication will be
the action/indication that failed.
In the right-hand column
under Check/Adjust/Replace are listed the tasks or measure-
ments to be performed.
When a step or action is completed
and the malfunction still occurs, proceed to the next step.
If the step locates the problem area, troubleshoot, isolate
and correct the malfunction.
6.1.2
Troubleshooting - Regulator/Power Conversion Module
Table 6-2 provides a step by step troubleshooting procedure
for the regulator/power conversion module.
The first 10 steps
of this troubleshooting table are so written that only a VOM
is required and should identify the card or component to be
replaced.
The other steps in the table require an oscilloscope.
NOTE
WHEN MEASUREMENTS ARE TAKEN ON THE BACK OF THE
CARD SOCKET, PUSH THE SMALL END OF THE RELEASE
TOOL IN, BESIDE THE SOCKET TERMINAL WIRE TO BE
MEASURED, AND USE IT FOR THE TEST EQUIPMENT
CONNECTION POINT.
6-1
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