Install guide
ARMY TM 5-6675-308-34
MARINE CORPS TM 08837A-34/2
Table 3-3.
Direct
Support
Troubleshooting
-
Continued
Malfunction
Probable
cause
Troubleshooting/corrective
action
4.
PS
fan
does
not
operate
a.
Defective
fan
continuously
Fan
voltage
is
115
VAC
which
can
be
lethal.
Use
extreme
care
in
measuring
it.
a.
Disconnect
PS
fan
b.
Measure
voltage
between
pins
A
and
B
and
A
and
C
of
connector
J6
c.
If
both
voltages
are
between
105
and
125
VAC,
replace
PS
fan,
Refer
to
TM
5-6675-308-12
andlor
TM
08837-12/1
b.
Defective
PS
If
either
voltage
is
out-of-tolerance,
replace
PS.
Refer
to
para
3-13d
5.
Both
IMU
and
computer
fan
a.
Defective
IMU
ambient
a.
Turn
PADS
off
and
disconnect
W5P1
do
not
operate
(at
temperatures temperature
thermostat
from
IMU
connector
2J4
above
20°C
(73°F))
b.
Measure
resistance
between
pins
K
and
N
of
2J4
c.
If
resistance
is
greater
than
3
ohms,
replace
IMU
ambient
temperature
thermo-
stat.
Refer
to
para
3-18c
b.
Defective
cable
W5
c.
Defective
PS
6.
Either
IMU
or
computer
fan
a.
Defective
fan
does
not
operate
(at
temperature
above
20°C
(73°F))
a.
Disconnect
W5P2
from
PS
connector
3J
1.
Turn
on
PADS
b.
Measure
voltage
between
pins
K
and
A,
K
and
N,
and
K
and
U
of3Jl
c.
If
all
voltages
measure
between
105
and
125
VAC,
replace
cable
W5.
Refer
to
TM
5-6675-308-12
andlor
TM
08837A-12/l
If
any
voltage
is
out
of
tolerance,
replace
PS.
Refer
to
para
3-13d
a.
Disconnect
W5P3
or
W5P4
from
non-
operating
fan
b.
Measure
voltage
between
pins
A
and
B,
and
A
and
C
of
W5P3
for
IMU
or
W5P4
for
computer
3-13