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 Place red lead of multimeter on pin C of wire 478 and
black lead to ground. Turn MASTER and APU GEN
switches ON, start APU, and check for voltage. Turn
APU and MASTER and APU GEN switches OFF. If
voltage is not present, replace regulator (see paragraph
6-5). If voltage is present, go to step E.
E Reconnect bulkhead to APU, master relay, and rigger's
lights wiring harness to regulator. Disconnect engine
generator relays to voltage regulator wiring harness at
switching relay box. Place red lead of multimeter in
socket C of wire 478. Turn MASTER and APU GEN
switches ON, start APU, and check for voltage. Turn
APU and MASTER and APU GEN switches OFF. If
voltage is not present, repair/replace wire 478 of engine
generator relays to voltage regulator wiring harness (see
paragraph 6-81). If voltage is present, go to step F.
F Place red lead of multimeter in socket D of wire 61/1.
Turn MASTER and APU GEN switches ON, start APU,
and check for voltage. Turn APU and MASTER and
APU GEN switches OFF. If voltage is not present,
repair/replace wire 61/1 of engine generator relays to
voltage regulator wiring harness (see paragraph 6-81).
If voltage is present, go to step G.
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