22 Dec
2019
22 Dec
'19
6:49 p.m.
Le Thu, 19 Dec 2019 21:48:29 +0100,
Fons Adriaensen <fons(a)linuxaudio.org> a écrit :
On Thu, Dec 19, 2019 at 10:04:09AM -0800, Len Ovens
wrote:
I have a Siemens documentation for their best quality
electrolytic capacitors. It date from the time Siemens/Fujitsu was
making the best electrolytic caps of the world. It is written than,
after 10 years of service, you you want to be sure the caps are still
in the range of their specification, you have to change them in all
cases.
Old caps are a major cause of failures in electronics, especially into
cheap electronics where it is a real nightmare when it is a lot of them.
As are contact corrosion and bad soldering points.
--
If you have a problem and you are not doing anything to fix it, you are
at the heart of the problem.
The most likely thig to be wrong is a capacitor.
With the i/o box
open find a larger cap probably close to where the power comes in
and after warm up try spraying this with some kind of "freeze
spray" to see if the problem comes back. replace tha cap that when
chilled causes the probalem to come back. Probably replace the
power supply cap just because... (higher value is ok)
If this is a faulty cap (and it may very well be), then cooling it
isn't going to help. Look for traces of leakage. If there is any,
replace the cap.