ARMY TM 9-1240-379-34
MARINE CORPS TM 04332A-34
2-1. TROUBLESHOOTING INFORMATION. (cont)
Table 2-1. TROUBLESHOOTING (cont)
TEST OR INSPECTION
7. POOR VISION THROUGH IMAGE INTENSIFIER ELBOW.
Check for proper alinement of reticle.
Adjust diopter length.
Check for dirt or fingerprints on all exposed optical surfaces.
Clean optics in accordance with TM 9-254.
Check for condensation; if moisture is present, check for defective sealing
or a defective valve core and purging valve stem using a soapy solution.
Purge and charge in accordance with TM 750-116.
If sealing is defective, replace elbow assembly (page 2-8}.
8. NO NIGHT CHANNEL IMAGE, LOW BRILLIANCE OF NIGHT IMAGE, OR NIGHT IMAGE
FLICKERS OR MOVES.
Check that shutter assembly switch is ON.
Step 2. Check that TUBE control knob is properly adjusted to obtain sufficient im-
S t e p 3. Check that image intensifier is not defective.