Ppi pc2350

oneball77 · 29th April 2011, 01:48 PM

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.

Perry Babin · 29th April 2011, 03:37 PM

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?

oneball77 · 29th April 2011, 04:14 PM

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...

Perry Babin · 29th April 2011, 07:00 PM

That's the inductor, not the transformer. That's going to be much easier to re-wind.

What are the dimensions on the capacitor?

oneball77 · 29th April 2011, 09:32 PM

Oh. They are 1" in diameter and 1 1/16" tall.

Perry Babin · 29th April 2011, 09:59 PM

Try THESE.

oneball77 · 30th April 2011, 12:58 AM

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.

oneball77 · 5th May 2011, 05:50 PM

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.

Perry Babin · 5th May 2011, 07:20 PM

When you power up the amp, what is the DC voltage across that resistor?

oneball77 · 6th May 2011, 02:48 PM

29th April 2011, 01:48 PM	#1
oneball77 diyAudio Member Join Date: Mar 2007	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.

29th April 2011, 03:37 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	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? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th April 2011, 07:00 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That's the inductor, not the transformer. That's going to be much easier to re-wind. What are the dimensions on the capacitor? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

29th April 2011, 09:59 PM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Try THESE. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

5th May 2011, 07:20 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	When you power up the amp, what is the DC voltage across that resistor? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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29th April 2011, 04:14 PM	#3
oneball77 diyAudio Member Join Date: Mar 2007	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...

29th April 2011, 09:32 PM	#5
oneball77 diyAudio Member Join Date: Mar 2007	Oh. They are 1" in diameter and 1 1/16" tall.

30th April 2011, 12:58 AM	#7
oneball77 diyAudio Member Join Date: Mar 2007	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.

5th May 2011, 05:50 PM	#8
oneball77 diyAudio Member Join Date: Mar 2007	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.

6th May 2011, 02:48 PM	#10
oneball77 diyAudio Member Join Date: Mar 2007

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