13 Feb
2008
13 Feb
'08
1:19 p.m.
On Wed, 13 Feb 2008 10:03:25 -0800
Kevin Cosgrove <kevinc(a)cosgroves.us> wrote:
There was a brand of motherboards that famously had capacitor issues
a couple of years ago as well. I'm glad that having worked throughout
my high school years as an electronic assembler, I know which end of the
soldering iron to hold. I've been able to revive a lot of "dead" gear
over the years!
I remembered a discussion on the Planet CCRMA list about the caps when I had
my problem, and there was a great post from someone who knew more theory
than I did about why 25v was too small for the circuit, and that 35v was
the way to go.
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. 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!
No problem; we all learn something when we post our successes here.
--
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