EOTech M914 (AN/PVS-14) Monocular Night Vision Device - Manual (Page 42)

3-2
3.1 TROUBLESHOOTING – Continued
Table 3-1 Troubleshooting Procedures – Continued
Malfunction Probable Cause Corrective Action
3. Poor or
degraded image –
Continued.
c. Insufficient ambient
light.
c. Turn the Mode Switch to the IR
position to provide IR light source
per section 2.6, or momentarily
activate the IR LED Illuminator per
section 2.7.
d. Gain (contrast) not
adjusted to an appropriate
setting.
d. Adjust gain (contrast) to a
comfortable level per section 2.8.
e. Not focused for viewing
distance being observed
(minimum 9.8 inches).
e. Focus objective lens per
section 2.9.
f. Diopter setting not
adjusted correctly.
f. Adjust diopter setting per
section 2.10.
g. Sacrificial window
and/or demist shield
obscured by dirt, dust, or
grime.
g. Clean sacrificial window and/or
demist shield per section 3.2,
Optical Surfaces.
h. Sacrificial window
and/or demist shield
cracked or scratched.
h. Replace sacrificial window
and/or demist shield per section
2.5.
i. Objective lens and/or
eyepiece obscured by dirt,
dust or grime.
i. Remove sacrificial window
and/or demist shield. Clean
objective lens and/or eyepiece per
section 3.2, Optical Surfaces.
4. IR LED
Illuminator does
not appear to
operate or
provides
insufficient light.
a. IR LED Illuminator exit
port is dirty.
a. Clean IR LED Illuminator exit
port per section 3.2, Optical
Surfaces.
b. Viewed scene is outside
effective range of IR LED
Illuminator.
b. Limit use of IR LED Illuminator
to viewed scenes within a few
meters of the MNVD.