[LAU] Multiple M-Audio Delta 1010s
kevinc at cosgroves.us
Wed Feb 13 13:03:25 EST 2008
On 13 February 2008 at 12:45, Joe Hartley <jh at brainiac.com> wrote:
kc> Could you share with us the symptom and specifics of the solution
kc> involving replacing a cap? I'm wondering if the noisy channels
kc> problem mentioned here a couple of times is related somehow.
> Heh - I just Googled to see if I could find a good link to describe
> the process and the first link I come up with is a post of mine to the
> Planet CCRMA list about the problem!
> My symptom was a horrendous buzz on all 8 output channels.
One unit I had started having troubles with buzz on the output
channels a few months after I bought it. At first power cycling the
unit would get it to behave, and at first it was only a few channels.
Eventually it was all channels, and I couldn't get it to behave.
I returned the unit under warranty and got a replacement.
> When I took
> apart the breakout box, I saw a quadrupling circuit on the left hand side
> of the bottom board (toward the front of the case, underneath the small
> board that's on top) that had a couple of oozing caps.
That happens more often in electronic equipment than the public generally knows.
Remember the laptop battery recall from months ago? I've seen quite
a few recalls for capacitor problems over the last 3 decades of
working in the electronics industry, first as a part-time soldering
and assembly person, and now as an analog IC designer.
> I replaced them with 2200uF 35v caps from DigiKey:
> If you've ever done electronic soldering before, it's a trivial procedure:
> remove the 2 small 2200uF 25v caps and squeeze the larger caps in there.
Doesn't sound too bad.
> The 35v caps are recommended, it was the underspec'ing of the caps that was
> causing the problems in the first place.
Did you measure the voltage somehow, or did you get documentation
from M-Audio somehow to figure out the new recommended voltage rating?
Excellent write-up. Thanks a bunch!
More information about the Linux-audio-user