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TM 55-4920-424-13&P
Trouble
Probable Cause
Remedy
2.
Control
Malfunctions of the APU
Console.
fully discussed in this Appendix.
When APU troubles occur, follow
the trouble shooting instructions
outlined in appropriate TM to isolate the
cause. Troubles traced to the
control console must be
located by a continuity check
to find the defective
component. Refer to paragraphs
6-3 through 6-6 for control
system malfunction information. Refer
to drawings in this Appendix for
continuity checks.
Figure E-18. Table of Troubleshooting Procedures (Sheet 2 of 2)
6-3.
TROUBLESHOOTING ELECTRICAL CONTROLS.
6-4.
Malfunctions in the APU controls should be traced only after it has been established that the battery is in good
condition and that all electrical connections are correctly and tightly connected. It is recommended that APU electrical
components be checked for proper operation before troubleshooting the check stand control components.
6-5.
Before performing any troubleshooting procedures, always verify that the power supply components to the APU
controls are functioning properly, furnishing 24-volt dc power to the control circuits, and are charging the battery. The
following components comprise the power supply to the APU.
-
Battery
-
DC starter-generator
-
Circuit br eaker CB1
-
DC voltage regulator VRI
-
Circuit breaker CB2
-
Reverse current cutout
-
Starter dropout relay
6-6.
If fuel supply problems are encountered, check switch S3, K3 and then check the boost pump for proper
operation.
E-52 Change 2

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