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
Remove lamp from socket. Place red lead of
multimeter in socket 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,
replace lamp (see paragraph 13-7). If voltage is not
present, go to step B.
B
Disconnect APU control box to foot dimmer switch and
bulkhead wiring harness from APU control box. Place
red lead of multimeter in socket N of 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 E. If voltage is not
present, go to step C.
2-175
