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 TM 9-1290-335-346P
CHAPTER 3
FAULT SYMPTOM INDEX
Symptom
Fault Isolation Procedure or
Maintenance Procedure
1.
Lamp(s) do not light
Paragraph 4-2
2.
Resetter knob does not stay in
Replace spring or bad resetter knob part (Vol II,
normal (up) position
para 4-6)
3.
Azimuth pointer does not move
Replace flange or bad part (Vol II, para 4-9)
when unpressed resetter knob is
turned
4.
Micrometer pointer does not turn
Replace flange or bad part (Vol II, para 4-9)
when unpressed resetter knob is
5.
Gunner's aid dial does not turn
Replace damaged spring or clamp (Vol II, para
smoothly or does not stay in place
4-3)
6.
Not all pointers turn when gear
Replace bad gear (Vol II, para 4-20, 4-25)
drive is turned
7.
Pointers do not turn smoothly when
a.
Do backlash adjustment (Vol II, para 5-3)
drive gear is turned
b.
Replace worn or broken gear (Vol II, para
4-25)
8.
Azimuth pointer and micrometer
a.
Replace weak spring (Vol II, para 4-12)
pointer do not turn together
b.
Replace flange (Vol II, para 4-9)
Vol I
3-1/(3-2 blank)
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