clean the contacts. Make sure that the external contact lugs are not broken. If necessary, replace the
batteries as they 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). 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 batteries if the total battery charge is less than 2.2 V. 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.
