TM 9-1240-380-34
FAULT SYMPTOM INDEX
Fault Isolation Procedure or
Symptom
Maintenance Procedure(s)
HEAD ASSEMBLY
1.
Cannot see clearly or pressure
Purge and charge head assembly (Vol II, para 8-2)
cannot be held in head assembly
2.
Head assembly does not fasten
a.
Tighten screws holding hooks on head assembly
(Vol II, para 4-9)
tightly to body assembly
Replace hook(s) on head assembly ( Vol II,
b.
3.
Arm binds or does not move freely
Send head assembly to depot for repair
Wing nuts on plate assembly bind
4.
Replace studs ( Vol II, para 4-18)
when turned
BODY ASSEMBLY
5.
Reticle does not light
Replace lower housing ( Vol II, para 5-3)
Cannot see clearly or pressure
Purge and charge body assembly ( Vol II, para 8-3)
6.
cannot be held in body assembly
7.
Reticle not sharply focused
Replace eyepiece assembly ( Vol II, para 5-24)
Parallax exists
Replace lower housing ( Vol II, para 5-3)
8.
9.
Body assembly does not fasten
a.
Remove cotter pin from latch and adjust latch
( Vol II, para 5-6)
tightly to head assembly firmly
b.
Replace latch ( Vol II, para 5-6)
10. Loose boresight knobs
Replace knob assembly (Vol II, para 5-15, 5-18)
Replace knob assembly (Vol II, para 5-15, 5-18)
11. Binding or rough turning of
boresight knobs
12. Incorrect voltage at contacts of
Replace housing assembly ( Vol II, para 5-12)
housing assembly
INFRARED BODY ASSEMBLY
(M36)
13. Dim, blinking or no green field of
view when power is on
14. Reticle does not light
Vol I
