SECTION V: TROUBLESHOOTING
TM 9-2350-256-20
WARNING
Remove all jewelry such as rings, dog
tags, bracelets, etc. If jewelry contacts a
metal surface a direct short may result in
instant
heating
of
tools,
damage
to
equipment,
and
injury
or
death
to
personnel.
A
Open center-front air inlet doors (TM 9-2350-256-10).
Disconnect bulkhead to APU, master relay, and rigger's
lights wiring harness from APU engine disconnect.
Place red lead of multimeter in socket A of wire 66 and
black lead to ground. Turn MASTER, and PREHEAT
switches on and check for voltage. Turn MASTER and
PREHEAT switches OFF. If voltage is present, go to
step B. If voltage is not present, troubleshoot battery
circuit.
B
Place red lead of multimeter in socket E of wire 65 and
black lead to ground. Turn MASTER, PREHEAT, and
APU START switches on and check for voltage. Turn
MASTER, PREHEAT, and APU START switches OFF.
If voltage is present, go to step C. If voltage is not
present, go to step D.
C
Place red lead of multimeter in socket D of wire 487
and black lead to ground. Turn MASTER and
PREHEAT switches ON and check for voltage. Turn
MASTER and PREHEAT switches OFF. If voltage is
present, notify Direct Support Maintenance. If voltage
is not present, go to step E.
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