Re: [LAD] [Somewhat OT] Strange failure mode of a PC

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To: <linux-audio-dev@...>
Date: Saturday, July 17, 2010 - 10:32 pm

On Sat, 17 Jul 2010 23:27:46 +0200
Ralf Mardorf wrote:

> On Sat, 2010-07-17 at 23:23 +0200, fons@kokkinizita.net wrote:

Hmmm.
I would say the black deposit was almost certainly silver oxide, and
silver contact switches are not suitable for zero wiping action - indeed
the only safe ones I know of are gold ones. See, it's all your fault.
No use means no wipe :)

However I'm slightly puzzled. I confess to not knowing *precisely* the
start-up operation of these PSUs, but wonder of the contacts are
normally closed, and start signal is from their break action.

Dirty switches and relays don't usually inadvertently close, but they
very frequently randomly open or partially open, and that would
fully account for the symptoms you saw.

There was a time when us poor trainees had to learn all about contact
materials, ratings, actions, yada yada :(

Kids today don't know how well off they are :P

--
Will J Godfrey
http://www.musically.me.uk
Say you have a poem and I have a tune.
Exchange them and we can both have a poem, a tune, and a song.
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Messages in current thread:
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Tim E. Real, (Mon Jul 19, 6:23 am)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Jörn Nettingsmeier, (Sun Jul 18, 12:38 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Florian Faber, (Sun Jul 18, 2:12 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Florian Faber, (Sun Jul 18, 3:07 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sun Jul 18, 1:28 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Gene Heskett, (Sun Jul 18, 2:56 am)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sun Jul 18, 9:28 am)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Gene Heskett, (Sun Jul 18, 1:33 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sun Jul 18, 2:04 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Arnold Krille, (Sat Jul 17, 9:20 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sat Jul 17, 9:17 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, drew Roberts, (Sat Jul 17, 10:04 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Gene Heskett, (Sun Jul 18, 2:59 am)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, drew Roberts, (Sun Jul 18, 2:07 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Gene Heskett, (Sun Jul 18, 2:49 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Frank Smith, (Mon Jul 19, 8:25 am)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Geoff Beasley, (Mon Jul 19, 8:32 am)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Gene Heskett, (Sun Jul 18, 3:14 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, drew Roberts, (Mon Jul 19, 2:46 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Gene Heskett, (Mon Jul 19, 6:34 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sun Jul 18, 6:30 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, James Morris, (Sun Jul 18, 9:37 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sat Jul 17, 10:23 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sat Jul 17, 10:19 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Frank Smith, (Sun Jul 18, 1:35 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sat Jul 17, 9:28 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Folderol, (Sat Jul 17, 10:32 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sat Jul 17, 10:45 pm)
Re: [LAD] [Somewhat OT] Strange failure mode of a PC, Ralf Mardorf, (Sat Jul 17, 9:22 pm)