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Old 29th April 2011, 01:48 PM   #1
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Default Ppi pc2350

Hi
I have a 2350 that blew 3 nichicon 63v 2200uf caps. From what i can tell the transformer shorted. The copper wire rubbed through the enamel and shorted with the red one. I can see the burn marks on the two wires and the copper one is discolored around the area. One end of the copper wire also broke loose from the board. If i rewind the transformer and replace the caps is it possible that will fix the problem? I cant find the exact caps to replace them but i found some 3300uf nichicons that will fit, is that ok? I saw on another thread someone replaced them with some vishays, would that be a better option? Any help is appreciated.
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Old 29th April 2011, 03:37 PM   #2
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Do you have any experience rewinding transformers?

The 3300s would work if the working voltage was 63v or greater but I'd recommend using the same value as the originals.

Can you post a photo of the burned transformer windings?

Did it blow any FETs?
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Old 29th April 2011, 04:14 PM   #3
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I have rewound a transformer in a pc4100 and it is working fine. Nothing else looks bad but I havent tested anything. Can you suggest a good replacement for nichicons and where I could find them. Mouser and Digikey have the 2200s but the lead time is 29 weeks. I looked for the vishays but could only find axials in 2200 63v. Pictures were taken with my phone so...
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Old 29th April 2011, 07:00 PM   #4
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That's the inductor, not the transformer. That's going to be much easier to re-wind.

What are the dimensions on the capacitor?
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Old 29th April 2011, 09:32 PM   #5
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Oh. They are 1" in diameter and 1 1/16" tall.
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Old 29th April 2011, 09:59 PM   #6
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Try THESE.
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Old 30th April 2011, 12:58 AM   #7
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OK I ordered 6 of the first cornell's. Hopefully this will fix the amp. I'll let you know how it turns out. Thanks.
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Old 5th May 2011, 05:50 PM   #8
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Ok so I got the amp back together today and hooked it up. Everything was working fine at very low volume on high pass gains set at 0. So I turned on low pass and turned the volume up but left the gains at 0. I got bad distortion then a little bit of smoke. I had it on a 10a fuse and that blew before too much damage was done. Only thing I can see is a (1w?) resistor burned up by the power inputs. Guess it's not going to be a easy fix after all.
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Old 5th May 2011, 07:20 PM   #9
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When you power up the amp, what is the DC voltage across that resistor?
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Old 6th May 2011, 02:48 PM   #10
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