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.
C
Reconnect wire 17 to light. Disconnect wire 17 from
rigger's SERVICE switch. Place red lead of multimeter
on switch terminal and black lead to ground. Turn
MASTER switch on, UNLOCK and turn main lighting
switch
to
STOP
LIGHT
position,
rigger's
B.O.
SELECTOR to SERVICE position, and check for
voltage. Turn MASTER, main lighting, and rigger's B.O.
SELECTOR switches OFF. If voltage is present, go to
step D. If voltage is not present, go to step E.
D
Reconnect wire 17 to rigger's SERVICE switch. Open
air inlet doors (TM 9-2350-256-10). Disconnect
bulkhead to APU, master relay, and rigger's lights wiring
harness from bulkhead disconnect. Place red lead of
multimeter on pin K of wire 17 and black lead to ground.
Turn MASTER switch on, UNLOCK and turn main
lighting switch to STOP LIGHT position, rigger's B.O.
SELECTOR to SERVICE position, and check for
voltage. Turn MASTER, main lighting, and rigger's B.O.
SELECTOR switches OFF. If voltage is not present,
repair/replace wire 17 of APU control box to foot dimmer
switch and bulkhead wiring harness (see paragraph 6-79
for dual voltage; 6-80 for single voltage) If voltage is
present, repair/replace wire 17 of bulkhead to APU,
master relay, and rigger's lights wiring harness (see
paragraph 6-75 for dual voltage; 6-76 for single
voltage).
E
Reconnect wire 17 to rigger's SERVICE switch.
Disconnect wire 16 from rigger's SERVICE light switch.
Place red lead of multimeter in wire 16 and black lead to
ground. Turn MASTER switch on, main lighting switch
to STOP LIGHT, and check for voltage. Turn MASTER
and main lighting switches OFF. If voltage is present,
replace rigger's service lights switch (see paragraph 6-
24). If voltage is not present, go to step F.
2-321
