Troubleshooting - Dedal-NV 450 Operation Manual

Protect the box from moisture penetration and the device should be protected from direct
sun influence. The device should be kept in a warm, dry place far from heating devices,
batteries should be taken out. Storage temperature must not exceed 60°C.
The device Dedal-450 does not work...
Make sure that the batteries have been installed and they are in good condition.
Dedal-450 can not be focused...
Adjust the objective lens and eyepiece according to the instructions specified in the
Operation section. If the device is not still focusing wipe and clean the optical parts.
The image has faded or disappeared completely...
Bright source of light can be a reason of the image reduction, loss of resolution or
complete disappearance. This is an automatic protection system of the device. If Dedal-
450 has been switched off automatically, turn the switch to the position OFF. The unit
will be ready for use in one-two seconds.
Condensation effect...
In order to avoid misting of the eyepiece lens in cold time use special anti-damping
covers (for example, for a spectacles).
Some black dots are on the screen...
The image may contain small black dots or groups of black dots. Most of black dots can
be seen only in daytime and in the operation mode the dots become almost invisible.
Bright points are on the screen...
The image may contain some bright points caused by gradual relief of static electricity
from the cathode. This feature may appear immediately after the assembly of the device
and removal/setting of the objective from/to the device, and it always disappears in 5-14
days of the device utilization (storage).
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Troubleshooting