Newcon Optik NVS 22-2XT - Manual (Page 12)

10
8. TROUBLESHOOTING
8.1. The scope does not turn on
Check whether the batteries are installed properly. Check the charge of
the batteries. Replace if they are weak. Do not mix old batteries with new
ones.
8.2. The target does not appear in focus.
Bring the target to the center of the image. By turning the knob 8 (Fig.1)
achieve the clearest target acquisition on the screen. If NVS 22-2XT is
used with daytime scope re-focus it. Repeat the focusing of NVS 22-2XT
and scope if necessary.
If the image still does not seem to be in focus, clean the lenses. They
could be foggy or dusty.
8.3. Image has disappeared.
If the objective lens of switched on NVS 22-2XT are exposed to bright
light it automatically shuts off to protect the image intensifier tube from
overload. When it happens, turn the unit off, wait for a few seconds and
turn it on again.
If the image has been lost at the moment of a shot, check contacts in the
battery compartment.
8.4. Condensation accumulates on the parts
In order to avoid misting of the eyepiece lens at cold use the special
protective cover.
8.5. Black dots on the screen
These are some blemishes in the image intensifier, which do not affect
the performance or reliability of a night vision device. Blemishes may
vary in size and number; they are inherent in the manufacturing process.
Most of them are seen in the daytime only and become almost invisible
during the night time.