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This topic comprises 2 pages: 1 2
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Author
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Topic: Strange buzzing noise with CP50
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Michael Schaffer
"Where is the Boardwalk Hotel?"
![](http://www.film-tech.com/ubbmembers/1204d.jpg)
Posts: 4143
From: Boston, MA
Registered: Apr 2002
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posted 06-19-2005 04:47 AM
Thanks for clarifying that! I was confused because I had actually thought the Cat.No.114 power supply was just a pair of transformers and a few filter caps, but a fresh glance at the schematic shows that I was mistaken. There are actually two diode assemblies in there. Of course, without rectifier circuits there would be no DC output. Today I had another look at the patient. I had thought that it should be possible to test-run it successfully without the 2 Cat.No.280T SR cards in there, in optical fault mode. But the buzzing still came back after a while, they told me. During the next test run, when I was present myself, everything seemed fine until the buzzing suddenly occurred insistently after about 30 minutes and disappeared instantly when those 2 cards were removed, only to reappear when they had been plugged back in. Drawing my IE-33 like Wyatt Earp (actually I don't have it in a holster, it's in my backpack, but you get the picture), I found that it was on both channels at the preamp as well. So it does look exactly like Sam said, caused by overheating of the power supply, with the only difference that it occurs earlier with the 2 SR cards in the system. The power supply was actually my very first suspect, but I was told by Dolby there was no way it could cause that problem. I should have asked Sam first instead...
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This topic comprises 2 pages: 1 2
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