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Originally Posted by yrh0413 /img/forum/go_quote.gif
what kind of damage to the board? Mine is still in stock form, and the buzz occurs when the CanAmp receives vibrations (e.g. my legs kick against the table, someone slams my room door, or even when i put my mug on my table). The buzz resides after a split second.
This is pretty annoying when i listen to classicals
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the main damage i've done is lifted pads off the circuit board that's mainly it. and also breaking the hearts of heed by butchering their amp.
Quote:
Originally Posted by yrh0413 /img/forum/go_quote.gif
weird, i do hope burn-in will help.
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i don't think burn in will help, i've had a sneaking suspicion that it's a grounding issue and i was right
tonight i opened her up again to attach a 3 prong australian cable to it and noticed that at the back of the board near the power supply on my canamp there are traces that look very deliberately cut - namely the left, right and ground signals from the RCAs.
these appear to have been replaced with the cable that runs along the bottom of the board, i'm not quite sure why heed did this, i would have thought that traces on the board would be better at carrying the signal than a cable, but meh didn't really want to re-connect the traces in case there was a circuit error or something
anyhow, my suspicion is that it's some sort of grounding issue and when you tap on the enclosure or when it vibrates it's storing energy that isn't going into ground and gets back into the signal somehow.
the reason i was looking for ground on the board to begin with is because the canamp is only a 2 prong power chord and since i am installing 3 prong that's when i noticed that the trace to ground was cut. perhaps on the boards of those that don't make noise the ground is still attached
anyway, before i installed my new power chord i decided to do a test for yrh0413 to see if my theory is correct. i reconnected ground ONLY. i then wired up the amp and tapped on it gently to begin with, and then more and more violently and voila, no more noise.
so i installed my power chord and it also removed some strange ultra low level hum that i believe is also ground related that i was getting when the canamp was hooked up to my DAC-AH (but no other source!) and maxed out the volume on the canamp. that and the little euro > australia adaptor kept coming loose and didn't look very secure.
if you have a soldering iron a little bit of wire, by little i mean like 5mm here's where you need to bridge:
if you look in the bottom right next to the nut, there are 2 square pads, they're quite close but are not linked, if you join them together it made my noise go away.
as always proceed with caution and i cannot accept any liability but like i said, my amp exhibited the same symptoms and now it's free from that!
