TM 11-5841-291-12
List of Common Troubles
Malfunction
Probable cause
Corrective action
Adjust cockpit dimmer
Panel edge lamps
Cockpit dimmer control set
a.
a.
do not light.
too dim.
control for visible edge
lighting.
b.
Faulty bulbs
b.
Replace control unit.
(See paragraphs 3-13
and 3-14.)
Defective POWER switch
c.
Replace control unit.
c.
on control unit.
(See paragraphs 3-13
and 3-14.)
Alert lamps do
Faulty lamps.
a.
Replace lamps. (See
a.
not light.
Defective indicator
Replace control unit.
b.
b.
(See paragraphs 3-13
switch.
and 3-14.)
Blown fuse in control
a.
Alert lamp does
Replace fuse.
a.
not light; audio not
unit.
heard in headset.
Perform system test
Defective receiver.
b.
b.
through all antennas.
(See paragraph 3-9a or
3-9b.) If alert lamp
does not light, replace
receiver. (See para-
graphs 3-11 and 3-12.)
a.
Replace receiver. (See
Defective receiver.
a.
Alert lamp does not
light, but audio is
paragraphs 3-11 and
b.
Defective wiring or
heard in headset.
3-12).
connectors between
Check continuity. (See
b.
receiver and control
unit.
Defective control unit.
Replace control unit.
c.
c.
(See paragraphs 3-13
and 3-14.)
Defective wiring or
Check continuity and
a.
a.
No audio, but alert
lamp lights.
improper connections
interconnection between
between receiver and
receiver and control
control unit.
unit. (See table 3-2.)
Replace receiver. (See
Defective receiver.
b.
b.
paragraphs 3-11 and
3-12.)
Defective control unit.
c.
c.
Replace control unit.
(See paragraphs 3-13
and 3-14.)
3-4
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