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The voltage should be good. It is possible the Infra-red emitter tube might be at fault.
The night vision can work under a full moon, so test the vision part to make sure it is working correctly. If you have an infra red/IR remote control for your TB set, you can test the might vision using that remote to see if the night vision is working.
You can use a second working unit to see if the illuminator is actually working. The illumination is not visible light without assistance.
Letto, This PVS-7B has a generation II image intensifier tube in it. The image tube is manufactured by ITT liton company. The only way to fix this wonderful NV devise is to send to ITT Night Vision Company. They are listed in the internet. Unless you can find someone to work on it, but the really need to know what they are doing. stewbison
It's called time exposure or flash over. What happen is the infiltrating light through the pen hole and a long duration will burn shadows into the micro channel plate in the generation 3 image intensifier tube.
These expensive image tubes can be repaired. Contact Itt inc or Vard Inc in Garland, TX. That about it unless you want to buy a new gen 3 image tube. Maybe $1500+. I would call around to other Night Vision Optica companies and see if the have a used gen 3 image tube. There quit a few companies in the USA that work on NV devise. Also, contact ITT and ask them they repair image tubes, maybe! stewbison
Hello, most of these night vision devises are repaired by the companies that
offer to sell and service. It almost impossible to find someone other than the
dealer to repair them. You try Morrision Optic they have big web page on the
Internet. A little warning here. These companies they sell NV devises are not
necessarily the manufacture of these NV devise. Russian make a lot of these NV
devises for US NV companies.
I repair them also but it hard for me to get parts, and I can make other
parts if I can find some dealer that will sell me parts For a 1st generation
cheap Russian image intensifier tube will cost about $175 each and sometime I
can get them cheaper. GB....stewbison
I had the same model, same problem. Bushnell replaced mine under warranty, If they needed to send it for repair it had to go to Russia. I guess it was cheaper to give me a new one. If its not under warranty Bushnell will send it off for you but it will cost quite a bit. My new pair lasted about 2 years with a lot of usage. Gen 1 night vision tubes do not have a very long life span. You may be better served buying a new pair of night vision binos.
I would strip the wires as carefully as I could and get them back together, get the 2 AA batteries back in there, and see what happens. Then go about making a permanent splice in the wires and getting the lens to stay on there, or ship it back to Russia for repairs. Or find somebody to do it. I'm sure it can be done. Hope this helps.
Define 'clear'. Is it blurry? Focus the scope or clean the lenses. Is it distorted? Don't know how to fix. Especially if the lens is cracked/scratched etc. Is it dark/snowy? Put fresh batteries in. Do you see black spots in the tube? Don't worry, certain amount of these are quite acceptable. Anyway: It's a night vision for pete's sake. The picture won't ever be like the one on normal binoculars.
Check the HV to the tube and see if you can see any discolouration or spots on the tube - they often indicate tube failure. Many binoculars use the one power supply for both tubes as the current demand is very low. Often, one tube operation indicates tube failure, but a wire or connection could be at fault.