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Old 11-29-2017, 08:31 PM   #1
mpdphil
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Default PSO-1 help needed!

I have an older soviet military PSO -1 scope with the IR filter. I made a battery adapter so a common 3 volt battery will power it, but for some reason the reticle will not light up. I bought the battery and a new 3v LED bulb from Kalinka, nothing. I used a multi meter (pics attached of the readings) and the voltage is getting to the bulb when the switch is on, but the new bulb won't light. I even put the old bulb back in and nothing. Could the the new bulb be defective, or am I doing something wrong? Any help is appreciated! Phil
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Old 11-29-2017, 09:03 PM   #2
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Originally Posted by mpdphil View Post
I have an older soviet military PSO -1 scope with the IR filter. I made a battery adapter so a common 3 volt battery will power it, but for some reason the reticle will not light up. I bought the battery and a new 3v LED bulb from Kalinka, nothing. I used a multi meter (pics attached of the readings) and the voltage is getting to the bulb when the switch is on, but the new bulb won't light. I even put the old bulb back in and nothing. Could the the new bulb be defective, or am I doing something wrong? Any help is appreciated! Phil
Did you try to reverse the poles of the battery?
I had this issue with a POSP 6 x 42 for the fix.
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Old 11-29-2017, 09:49 PM   #3
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Did you try to reverse the poles of the battery?
I had this issue with a POSP 6 x 42 for the fix.
I just tried to do that, nothing. Thanks for the advice!
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Old 11-30-2017, 12:28 AM   #4
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With the battery and cap installed, can you measure 3 volts where the bulb screws in?
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Old 11-30-2017, 01:38 AM   #5
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With the battery and cap installed, can you measure 3 volts where the bulb screws in?
I just tested it with the cap installed and I get around 2.93 volts when I touch the battery cap and the post that sticks out from the reticle bulb housing where the wire attaches,see pic. I couldnt get the reading in the photo, but it reads 2.93 exactly where it shows. I tested the bulb outside of the scope and it lights up great, just not when it is installed in the scope.
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Old 12-01-2017, 09:48 PM   #6
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Lots of PSO-1's have the battery contact blued by armorers that don't understand that bluing is an electical insulator. If the battery contact isn't bare shiney metal, sandpaper the bluing away to make actual CONTACT with the battery.
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Old 12-01-2017, 10:16 PM   #7
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Lots of PSO-1's have the battery contact blued by armorers that don't understand that bluing is an electical insulator. If the battery contact isn't bare shiney metal, sandpaper the bluing away to make actual CONTACT with the battery.
That's one of the first things I did, took the cap apart and scuffed the contact down to bare metal. This has me baffled.
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