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.
D
Remove four nuts (6), four lockwashers (7), four
screws (8), and release APU control box (9) from
mounting bracket. Place a jumper wire from pin N to
socket N. Place red lead of multimeter on pin F of wire
421 and black lead to ground. Turn MASTER and APU
FUEL SHUTOFF switches ON, and check for voltage.
Turn MASTER and APU FUEL SHUTOFF switches
OFF. If voltage is present, go to step I. If voltage is
not present, go to step E.
E
Remove four screws (10), four lockwashers (11), and
release rear panel (12) from APU control box (9).
Reconnect APU control box to foot dimmer switch and
bulkhead
wiring
harness
to
APU
control
box.
Disconnect wire 419 from 15 A circuit breaker. Place
red lead of multimeter in wire 419 and black lead to
ground. Turn MASTER switch on and check for
voltage. Turn MASTER switch OFF. If voltage is
present, go to step F. If voltage is not present,
repair/replace wire 419 of APU control box wiring
harness from connector to circuit breaker (see
paragraph 13-7).
2-171
