8 Aug
2011
8 Aug
'11
1:34 p.m.
-----Original Message-----
From: cctalk-bounces at classiccmp.org [mailto:cctalk-
bounces at classiccmp.org] On Behalf Of Tony Duell
Sent: 08 August 2011 19:31
To: cctalk at classiccmp.org
Subject: Re: cctech Digest, Vol 96, Issue 5
the
I realise that Tony wishes to understand how a
machine works and
repair the least possible. I like that principle too, especially when
it comes to
I find that the only way to be sure I have cured the fualt is to know what fault was. Replaicng parts until the fualt seems to go
away is very
unsatisfactory (particularly with intermittent faults), you might well
have
distrubed a bad connection when replacing some other
part, for example.
an
vintage equipment. I also understand the argument
about what you
consider a
I have to say that you were very much 'thrown in the deep end' by having
H7140 PSU as one of your first repairs. I'd not
wish that on anybody :-)
Despite the frustrations it has actually been quite an enjoyable experience
so far, I am just hoping the last little repair will really be the last, I
will know in a few days. I have really learned a lot, which is all thanks to
your amazing help. My initial comment was really tongue in cheek,
particularly knowing who I was replying to... :-)
With vintage machines, you often hgave to repair to compoent level for the
simple reason that you can stil lget the components (even if they are not
still
being made, there are likely to be NO ones around),
but you can't find
_known-good_ spare bartds, etc to swap in. I couldn't repair my HP9800s as
HP intended (by repacing boards until the machine works) becasue finding a
known-good HP9800 board set is imposible. FortunatelyI am not afraid to
use
a logic anaylser...
-tony