Optocoupler power supply

Thread Starter

Alchemy One

Joined Oct 5, 2019
106
Hello,
This circuit board seem to be power supply that lights up a lamp/light to a projector. It seem to supply 70 volts to the light bulb.
Having what appear to be 3 optocouplers would indicate the supply to the light bulb must be 70 VDC.
So I am wondering what low voltage do I supply to these wires and in what manner. There seem to be 1 white and 4 green/brown wires that feeds the optocouplers.
I would think the white wire is the ground and the other 4 wires power from a DC power source.
Pictures included.
Thanks.
 

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Thread Starter

Alchemy One

Joined Oct 5, 2019
106
What is the device number on the opto's?
Max.
It is difficult to see it, however it is PC 123. Here is a pic from online. It is 5 volts supply but how is it that there is 5 wires, of which 4 in maybe power (?) feeding 3 optocoupler. It is typically 2 in put and 2 out put for each and if you combine them all, it still doesn't add up.
Furthermore I should be able to directly supply the light bulb with a DC power supply and get some amount of light out of it even if it be 30 volts. maybe not.
I don't know if they bulbs are mercury or whatever filled. This moldel maybe an old version but their decendents can be found online and sure they are not cheap.
I got this out of a Hitachi projector that had things missing and the projector was working fine and turned on without any problem.
So why in the world I can't turn this on by supplying power. How could there be any mystery to it. I didn't shake or bust it or anything and it is not like I am trying to run some motor or something.
These lights are suppose to be quite bright from what I found it. Could easily be 3000 lumens.
I should mention that I even supplied it with ac if just for 10th of a second. Nothing. I don't see any burned or loose anything inside the bulb.
 

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