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TM-9-1240-322-34-P Sight Infinity: 8635466 (1240-00-056-4854) Manual
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CHAPTER 4 FAULT ISOLATION PROCEDURES
TM 9-1240-322-34&P
FAULT SYMPTOM INDEX
Fault Isolation Procedure or
Symptom
Maintenance Procedure
Replace variable resistor (Vol II, para 4-18)
Variable resistor does not turn
1.
smoothly
2.
Reticle image cannot be seen
Purge and charge unit (Vol II, para 5-3)
3.
Image not clear or pressure
cannot be held in unit
Send unit to depot for repair
4.
Image broken or spots of light
Disassemble and replace boresight knobs. (Vol II, para
5.
Boresight knobs do not turn
4-30 or 4-33)
smoothly
Replace elevation knob (Vol II, para 4-30)
6.
Elevation knob does not move
reticle image properly
Replace azimuth knob (Vol II, para 4-33)
7.
Azimuth knob does not move
reticle image properly
Send unit to depot for repair
8.
No voltage at contacts
Replace toggle switch (Vol II, para 4-24)
9.
Reticle stays lit with toggle
switch in "OFF" position
3-1/(3-2
blank)
Vol I

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