TM 9-2350-230-12
Malfunction
Probable cause
Corrective action
COMMANDER'S CUPOLA -
Continued
80 Cupola will not
f
Damaged race
f
Notify support
traverse or erratic
ring
maintenance.
in power mode -
g Notify support
continued
g Traverse mecha-
nism motor de-
maintenance.
fective.
a Notify support
81 Cupola will not
a Defective trav-
traverse manually
erse mechanism
- maintenance.
b Notify support
b Defective cupola
race ring
maintenance.
COMMANDER'S CUPOLA - M551A1 ONLY
81.1
Readout 9995
Commander's cupola
Notify support main-
appears at RANGE
contact brush
tenance to inspect,
(METERS) and 1
assemblies or
clean, and adjust
appears at RETURNS
electrical contact
contact brush
at commander's dis-
rings are worn,
assemblies.
play when cupola is
dirty, or out of
traversed electri-
adjustment.
cally.
81.2
Cupola drive
Magnetic switch not
Notify support main-
mechanism makes
disengaged
tenance to check
loud noise when
clutch electrical
ROTATION switch is
circuit.
actuated.
81.3
Cupola mag-
Cal .50 machine gun
Check/replace cable
netic clutch acti-
direction cable is
and/or traverse
vates when CUPOLA/
severed or has a
switch assembly
LASER switch is
grounded wire
(fig 10-49.2.1).
turned on.
81.4
Cupola tra-
Cal .50 machine gun
Check/replace cable
verses immediately
direction cable
and/or traverse
when CUPOLA/LASER
is severed or has
switch assembly
switch is turned
a grounded wire
(fig 10-49.2.1).
on.
8-32
