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This topic comprises 2 pages: 1 2
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Author
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Topic: Replacing blown diodes on Christies
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Frank Dubrois
Jedi Master Film Handler
Posts: 896
From: Cleveland, OH
Registered: Mar 2005
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posted 03-29-2006 03:41 PM
We have had several experiences with a diode going out in the middle of a show. We replace it and think nothing more of it. We have been noticing that when one diode goes out, it is usually follwed by another one...and another one...all on the same projector, sometimes weeks apart, sometimes a month or so, sometimes never. It sounds like the one diode going out might be weakening the others in some occasions.
My question is this: When one diode goes out, do you simply change that one diode and hope the others don't fail? Or do you anticipate the other diodes following suit and just change them all at the same time? It seems like a waste of "good" diodes, but then with the potential of the projector going out in the middle of another show...and the past track record of additional diodes going out soon after, it only seems logical to change them all and avoid future problems. Anyones input on this matter would be appreciated. Also, if anyone knows Christies official recommendation, I'd like to know that.
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John Walsh
Film God
![](http://www.film-tech.com/ubbmembers/168.jpg)
Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999
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posted 03-29-2006 04:57 PM
I used to be in the 'change only the bad one' camp, and this worked OK on the many older IREM supplies I delt with. But for some reason, with the newer supplies, I've had the same experience; one goes, then another, etc. So now I'm a 'change em' all' guy. I don't want to risk loosing a show.
I think what happens is, when one shorts, the other diodes conduct "into" the shorted diode for only the time their phase is on, which weakens them. That's why they don't die right away. A suggestion might be; if you take out the bad diode and it's shorted, replace them all. If it's open, just change that one.
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