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This topic comprises 3 pages: 1 2 3
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Author
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Topic: Strong Power Supply Problems!!!
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Steve Wilson
Expert Film Handler
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Posts: 109
From: Paoli, IN, USA
Registered: May 2004
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posted 08-19-2006 12:35 AM
Hi Guys and Gals,
I am having problems with my 1983 Single Phase, Strong Power Supply. Friday night, when I turned it on, the bulb lighted Okay, but the power supply did a lot of screaming, almost sounding like a siren going off. But, my guess would be dancing contact points. After about 60 to 90 seconds it settled down to a hum and we were able to stay on the screen.
After the movie was over, I turned the bulb off for about 5 mintues and restruck it again and again the loud siren type of noise came about.
After shutting the breaker down, I opened the side panel. Looked like some squirls many have been in there at some point, the largest of the two transformers was very hot to the touch. Thats about all that I know at this point.
Can anyone give me some idea as to what is going on here. Thanks in advance for any help!
Holiday Drive In Theater Steve Wilson Paoli, IN Home of Ski Paoli Peaks Ph# 812-723-2345 24/7
"Be there, when the Stars come out Tonight!"
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Steve Wilson
Expert Film Handler
![](http://www.film-tech.com/ubbmembers/2411.jpg)
Posts: 109
From: Paoli, IN, USA
Registered: May 2004
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posted 08-19-2006 01:01 AM
Loose transformer windings? Bad muffin fan? I would say shorted diode is possilbe, but the bulb current would have been very low, if it lit at all, and it would've burned out to an open after a little while - then you would see a 12 cycle pulsation in the illumination on the screen.
I'd say turn it on with the cover off, and see if you can better locate the source.
[EDIT] We posted at the same time, Justin.. good call!
Tim, Justin. The picture was rock steady with ample light on the screen, the amps at a steady and normal 75amps. I will check the fan motor tommarow and try to put some oil to it if I can find a place. I will also try to fire it up with the panel off with great care. Hi Jack, its an awfull small fan to cause that kind of noise, but I guess its possible.
You have to remember, the unit was on and the fan is running long before I turn on the main projection switch, which then strikes the lamp. No noise came from the power supply until the lamp was ignighted. I did not do my normal warm up of the power supply as I would normally do either. It that important!
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Steve Wilson
Expert Film Handler
![](http://www.film-tech.com/ubbmembers/2411.jpg)
Posts: 109
From: Paoli, IN, USA
Registered: May 2004
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posted 08-19-2006 12:59 PM
Steve: would bet on the contactor contacts singing due to moisture. It's been very high humidity in our area,lately. Louis
Louis, I opened the side of the box today, made sure all the connections are tight. Cleaned everything good and then turned the lamp on with the side panel off. Sounds like the noise is coming from the Contacts in a contact block that is attached right above the Largest Transformer. Humid, oh Yes, Humid!!! for sure! Louis, you might have this right on. What should I do, just run the machine till something else happends such as drying out.
Last night after the show let out. I let the bulb cool for about 10 minutes and the refired the bulb and I got the same loud noise all over again. It did go away again with time. Today, it did not go away, however, I only had the bulb lit for a few minutes.
Other than the loud noise, everything seems to be working fine!
Thanks
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