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» Film-Tech Forum   » Operations   » Film Handlers' Forum   » Cat.700 power supply humming

   
Author Topic: Cat.700 power supply humming
Michael Schaffer
"Where is the
Boardwalk Hotel?"

Posts: 4143
From: Boston, MA
Registered: Apr 2002


 - posted 07-07-2004 05:09 AM      Profile for Michael Schaffer   Author's Homepage   Email Michael Schaffer   Send New Private Message       Edit/Delete Post 
I just had 2 of these fail, one could be saved by soldering the wires which had blackened in the infamous molex connector directly to the board. After the same operation, the other works now too, but it still makes a loud buzzing sound. I couldn`t locate which of the parts on the board makes it. According to the projectionist it started smoking at one point, but there is no visible damage. Both the humming and the smoking were apparently there before the operation.

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Darryl Spicer
Film God

Posts: 3250
From: Lexington, KY, USA
Registered: Dec 2000


 - posted 07-07-2004 09:29 AM      Profile for Darryl Spicer     Send New Private Message       Edit/Delete Post 
Sounds like it could be a transformer issue within the power supply but that is just a thought. Would have to take it apart and see where the smoke and hum could be coming from.

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16059
From: Bountiful, Utah
Registered: Jun 99


 - posted 07-08-2004 12:02 AM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
Oh no! You didn't let the smoke out???? Now ya got to get it back into where it came from. How ya goin to do that? Joe wants to know..... [Confused]

The P.S. doesn't use a transformer per say since its a switching supply and runs at high frequency.

Mark

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Gordon McLeod
Film God

Posts: 9431
From: Toronto Ontario Canada
Registered: Jun 99


 - posted 07-08-2004 09:06 AM      Profile for Gordon McLeod   Email Gordon McLeod   Send New Private Message       Edit/Delete Post 
I thought in california you were not allowed to smoke indoors anymore [Big Grin]

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Darryl Spicer
Film God

Posts: 3250
From: Lexington, KY, USA
Registered: Dec 2000


 - posted 07-08-2004 12:57 PM      Profile for Darryl Spicer     Send New Private Message       Edit/Delete Post 
Jesus, does anyone have any real answers to his problems. If not then I guess you should call Dolby and ask their advice.

Oh and smoking is banned inside public buildings in our city. [Smile]

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Mark Gulbrandsen
Resident Trollmaster

Posts: 16059
From: Bountiful, Utah
Registered: Jun 99


 - posted 07-08-2004 08:58 PM      Profile for Mark Gulbrandsen   Email Mark Gulbrandsen   Send New Private Message       Edit/Delete Post 
Its TTRI for that power supply... best known as Time To Replace It.

Mark

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Michael Schaffer
"Where is the
Boardwalk Hotel?"

Posts: 4143
From: Boston, MA
Registered: Apr 2002


 - posted 07-09-2004 02:12 AM      Profile for Michael Schaffer   Author's Homepage   Email Michael Schaffer   Send New Private Message       Edit/Delete Post 
I ordered a repair exchange since it looks like it isn`t a part that would be easy to isolate and desolder on my kitchen table. In the heat of the summer season, we don`t want to go without digital for too long.

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