external contact lug is not broken. If necessary, replace the battery as it may be depleted. Also, be sure that the
power is in the “ON” position when trying to turn on the scope.
•
Distinct black dots appear on the screen.
These dots are minor cosmetic blemishes resulting from tube production processes and do not
interfere with the reliability or performance of the scope.
•
The scope flickers, flashes or “snows”.
The scope may flicker or flash when used in a bright environment; to correct this, place the cap over
the objective lens and enter a dark environment. The scope will restore itself to a natural functioning state in
several minutes or hours, depending on how long the scope had been exposed to the light. The scope may
flicker for the first several seconds of use, even when in a dark environment, before the scope corrects itself and
functions properly. The scope may “snow” for several minutes after being exposed to a bright light source
(daylight, a car's headlights, fire, etc.) even if being operated in complete darkness.
•
The image is not focused.
Adjust the focus of the eyepiece and the objective (see “Use and Testing” section). Check that the
lenses are not foggy or dusty; if they are, carefully clean the external surfaces of lenses with a soft cotton fabric.
Replace the battery if the total battery charge is less than 2.2V. When the unit is brought into a warm
environment from a cold one, condensation may appear on the internal lenses; you must wait two hours before
using the unit.
•
Visibility decreases or disappears.
Bright light sources, such as headlights, may cause visibility to decrease or disappear and the image to
flicker. Turn the power off and turn the scope away from the light source; visibility will restore itself in several
minutes.
