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Topic: NEC 2000 POWER SUPPLY PROBLEM ?
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Leo Enticknap
Film God
![](http://www.film-tech.com/ubbmembers/534a.jpg)
Posts: 7474
From: Loma Linda, CA
Registered: Jul 2000
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posted 09-20-2018 05:20 PM
I was told that when you replace a ballast, you must replace the lamp it powers along with it. Presumably that's the reason why: if the lamp has failed in a shorted state, then if you replace the ballast with that lamp still installed, you'll fry the new ballast.
One of the ballast/lamp combos I replaced included a lamp that had done 5,200 hours (and I think that must be genuine, because the hours are stored on the lamp info chip: it's not like they forgot to reset the timer), and so I think that can probably be blamed on the bulb. The others were all with lamps that were well within warranty hours, though. The only common factor I noticed was overheating: two of the affected projectors were in rabbit hutch enclosures in Bel-Air Circuit homes with inadequate ventilation, and the others were in booths that seemed really hot to me. The temperature data in the logs looked gnarly, to put it mildly.
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