TABLE 4-2. OPERATOR TROUBLESSHOOTING
MALFUNCTION
PROBABLE CAUSE / TEST/
INSPECTION
CORRECTIVE ACTION
Equipment fails to activate.
Battery is missing or improperly
installed.
Battery is dead.
Battery surfaces or contacts are
dirty or corroded.
Remote control unit is damaged.
Remote control batteries are
dead.
Defective image intensifier tube.
Insert battery or install it cor-
rectly.
Replace battery.
Clean the contact surfaces with a
pencil eraser and / or alcohol and
cotton swabs.
Please contact Customer Support.
Replace the batteries as per Part
4.4.3.
Please contact Customer Support.
Poor image quality.
Check focus.
Objective and output lenses are
dirty.
Damaged optical components.
Refocus.
Thoroughly clean the surface of
each lens.
Please contact Customer Support.
LED indicator fails to activate. Visual inspection.
Please contact Customer Support.
The NM-108 BC affects bore-
sight after installation or dur-
ing the firing.
Factory alignment is broken.
Please contact Customer Support.
Hindered rotation of the bat-
tery cap.
Dirty cap thread.
Damaged cap thread.
Clean the thread.
Please contact Customer Support.
Battery adapter difficult to re-
move.
Check for damaged adapter and
battery cap.
If damaged please contact Cus-
tomer Support.
Light visible around light sup-
pressor.
Incorrect position of the NM-108
BC relative to the day scope.
Check the light suppressor re-
silience.
Align the NM-108 BC position
relative to the day scope.
If light suppressor is defective
please contact Customer Support.
4.3
Inspection Criteria for Proper Image Intensifier Tube Operation
4.3.1 Operational Defects
Operational defects relate to the reliability of the intensifier, and are an indication of instability. If
identified, the user will need to return the NM-108 BC immediately. Operational defects include
shading, edge glow, flashing, flickering, and intermittent operation.
A. Shading
If shading is persistent, you will not be able to see a fully circular image (Figure 4-1). Shading is a
very dark, high-contrast area with a distinct line of demarcation present, and you cannot see an image
through it. Shading always begins on the edge and will eventually migrate inward until it spans across
the entire image area. If you notice shading with your device, please contact Customer Support.
