| Possible malfunctions |
Probable reason |
Troubleshooting |
| There is no image in eyepieces. |
1. The battery is discharged.
2. Battery polarity is not observed.
3. The contact between a battery compartment and the battery (case) is broken.
4. Big light exposure, protection against bright light works.
|
1. Replace the battery.
2. Reinstall the battery.
3. Strip the places of contact.
4. Go to less lighted place for your observation. If light exposure is more than 3 lux (day or electric light) the device can be turned on only with covers put on the objective. Thus it is necessary to close a light protection window.
|
| Low brightness of the image in eyepieces. |
The lowered battery voltage. |
Replace the battery. |
| Bad quality of the image (blurred image). |
1. The objective and eyepiece are not focused.
2. The front lenses of the objective or the eyepiece are polluted.
|
1. Focus the objective and eyepiece.
2. Wipe lenses with soft, pileless cloth slightly moistened in ethyl alcohol or use special napkins for wiping optical glasses.
|
If you could not remove independently possible malfunction, do not try to disassemble and repair the device without assistance. It can lead to even more serious breakage and annulment of warranty.
When observing through the device you can distinguish separate dark dots or small groups of dark dots. Presence of these dots on the screen of the image tube are caused by features of technological process of the tube manufacturing and it is not a defect.
