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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Mon Aug 26, 2013 7:48 pm Post subject: does arcing sound like a crackle? |
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last night when my Barco 708 was turned on, I heard a series of cracking noises.
I noticed that some of the crackles has an effect on the on screen picture...like, the crackle would correspond to a quick fluctuation in brightness.
They subsided after a minute or so, and then I never heard another one.
Was this arcing?
Last time I used the projector there was no crackling whatsoever...hmmmm.
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joatmon
Joined: 17 Mar 2009
Posts: 127
Location: Ottawa, Ontario
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| Posted: Mon Aug 26, 2013 8:07 pm Post subject: |
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It's been a long since mine arc'd, but it's a crisp snap if it happens. The image collapses and then immediately comes back.
_________________
Entertained by a Runco DTV-940 (aka Barco Cine7/708)
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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Mon Aug 26, 2013 8:26 pm Post subject: |
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ok...mine might have had a very small collapse....
Do you know if there are any preventative measures for arcing?
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Tim in Phoenix
Joined: 21 Oct 2006
Posts: 4409
Location: Phoenix
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| Posted: Mon Aug 26, 2013 11:55 pm Post subject: |
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Hello
Arcing from the anode leads or splitter can be brought on by extremes of humidity, or insulation starting to fail; one usually hears a snap and there may be an ozone smell. If the problem continues try observing the machine with the covers off in a dark room, you may see a flash indicating the problem spot. If the arcing continues, replacing an anode lead may be indicated.
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benareeno
Joined: 22 Mar 2006
Posts: 1614
Location: ottawa, canada
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| Posted: Tue Aug 27, 2013 4:42 am Post subject: |
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Thanks Tim...will do.
What would happen if someone was doing astig and became part of the arc??
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Tue Aug 27, 2013 4:52 am Post subject: |
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The crackle is normal and doesn't have any bad side effects. As described above an Arc will snap and that usually does cause a change in image. It also will cause a change in your image if you happen to place your hand in the way of the Arc 
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