Article View: comp.sys.acorn.tech
Article #471My dead A410/1 PSU :-(
From: Glenn Garrett
Date: Sun, 04 Oct 1992 16:12
Date: Sun, 04 Oct 1992 16:12
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2599 bytes
Hello everyone
A question on the Arc PSU (410/1). Recently, I managed to make that
lovely age old mistake of shorting all the power outputs to ground, which
promptly killed my PSU.
After having got over the initial shock of realising that the PSU was
not going to come out of its coma easily (like an old BBC supply would),
I had to connect up an old disk drive power supply I had spare -
fortunately it was powerful enough to power the computer and hard drive.
Anyway it would seem that the main power transistor is gone (short
circuit), along with R4 and the two fuses. There may be other
components too. I would like advice - should I try and get hold of
another power transistor, (but there may be other components too),
or am I going to have to shell out 50 quid for a new supply?? I am not
over well-endowed with money!
1. Has anyone made the same mistake as I and what repair procedures were needed?
2. Can anyone tell me the value of R4 as it is burnt to illegibility?
3. Has anyone got a spare supply going cheap, either new, second-hand or
not working?
Any help much appreciated - please mail me direct and I will post a
summary to the group. Interestingly, my current supply does not have
-5V and the only side effect of this seems to be that the sound from
the computer doesn't work! :-( I think a 7660 IC should cure this
though if I get time to wire one up.
Many thanks - Glenn Garrett, (a normally silent CSA fan).
PS Any comments on the rumour that ARM3's are soon to drop in price?
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Newsgroups: comp.sys.acorn.tech Path: arc1-ca.pugleaf.net!sparky!uunet!mnemosyne.cs.du.edu!nyx!ggasrren From: ggasrren@nyx.cs.du.edu (Glenn Garrett) Subject: My dead A410/1 PSU :-( Message-ID: <1992Oct4.161201.224@mnemosyne.cs.du.edu> Sender: usenet@mnemosyne.cs.du.edu (netnews admin account) Organization: Nyx, Public Access Unix @ U. of Denver Math/CS dept. Date: Sun, 4 Oct 92 16:12:01 GMT Lines: 37