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Old 15th October 2004, 03:16 AM   #41
Andres is offline Andres  United States
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Default Help with optos, please.

TUGA, ARE YOU THERE??!?!

I've followed this thread to the extent of my posibilities. I could use some help now.

I've found the optos, and identified one cable as ground but, when measuring voltage between this "ground" and the ground marked at the mainboard (see pic. 4) I get 5V....I'm confused.
All voltages are the same at Standby, Startup (when I press the power button) and after the Lamp Led starts flashing (signaling it has detected no lamp).

HELP!!!!

Andres
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Old 15th October 2004, 03:18 AM   #42
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Old 15th October 2004, 03:20 AM   #43
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Old 15th October 2004, 03:21 AM   #44
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Old 15th October 2004, 08:59 PM   #45
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I dont know if I got this right... could it be that I have to pull line 2 (in my diagram) to 5V? This seems to be the return line, right?

If anyone knows please reply, otherwise I'm gonna have to try anyways and I dont feel like blowing any parts of my projector up.

Thanks.
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Old 17th October 2004, 03:00 AM   #46
Andres is offline Andres  United States
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I DID IT!!!! THAT WAS IT!!

I now have a fully functional projector with no lamp!!

Step 2: getting a HQI lamp in there.
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Old 17th October 2004, 04:11 AM   #47
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Sweet! I totally forgot about this thread, and my projector is still apart on the floor. I gave up on it months ago, but now it looks like i can finally use it.

Now how do I pull that line to 5v?
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Old 17th October 2004, 04:28 PM   #48
Andres is offline Andres  United States
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If you look at my pictures, they look very much like yours but the optocouplers are switched I think. The one you are looking for (the one that tells the mainboard when the lamp is on) is the bottom one, or the right one if you are looking from the connector.

You need to bypass that optocupler. Look at the drawing. If you do that, that circuit is ALWAYS going to be closed and so the mainboard will get the "OK" signal all the time.

I used a paper clip on the connector to do this. You have to be certain which wire from the connector goes to which of the four "ends" of the optocouplers to do this.

Ask again if its not clear enough.
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Old 18th October 2004, 12:21 PM   #49
Tuga is offline Tuga  United Kingdom
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Hi,

Sorry for not replying but was away on a fishing trip.

I'm glad that the info on using optos was useful to someone else!!

Well done! now you only need to build a light engine small enough to fit in the projector.
I still donít have the lamp.

You might find that you can remove some bits out of the power supply side.


In my case a whole PCB, it will give me room to fit the ballast and ignitor inside the projector. Once is finished you wont be able to see the difference from the outside. Hopefully.



but be careful with the HIGH VOLTAGES.
Always work on it switched off.
Also remember that capacitors can store enough to give you a nasty electric shock even several hours after you have switched the power off.
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Old 18th October 2004, 01:16 PM   #50
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Hi Tuga,

Following what you had done I also removed the whole PCB with the optos with great success!!

If I remove a steel box (with a glass window) where the lamp used to be I now have a space thats roughly 5"x5" by 7" deep. I hope this is enough for the lamp at least. I might not mind putting the ballast on the outside.

I've been looking into the light engine situation for a few days and I havent been able to figure out if I can get a lamp+reflector thats gonna give me a beam thats parallel enough. I might need to add a condenser lens to the setup, which will increase the size of the light engine.

What are your thoughts on this?
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