30 Oct
2017
30 Oct
'17
7:41 a.m.
I have ordered the part now anyway. Whether I will replace it or not I don't
know yet. I am told that ESR measurements are not enough to detect bad caps
though, although I always replace ones with ESR that is at or close to the
limit on the table printed on my meter.
Regards
Rob
-----Original Message-----
From: Maciej W. Rozycki [mailto:macro at linux-mips.org]
Sent: 30 October 2017 12:12
To: rob at jarratt.me.uk
Cc: 'General Discussion: On-Topic and Off-Topic Posts'
<cctalk at classiccmp.org>; 'dwight' <dkelvey at hotmail.com>
Subject: RE: Cleaning and Restoring a Badly Corroded PSU
Hi Rob,
> By the way I just noticed a 15uF/25V one next to the fan connector. It
> isn't one of the SXF ones as far as I can tell, do you recall replacing
it?
My notes indicate it is a Chemi-Con SM, a general purpose 85?C part. I
did
replace it at least once, in one of my H7826s that
didn't actually get to
leaking
(yet?) and was still in a working condition. I
suspect doing the
replacement
didn't really matter, as measuring the original
gave reasonable readings
for its
class.
I also have a later revision of H7826 which has LXF rather than SXF
capacitors
and this one looks really clean, almost like new, and
also works
correctly. I am
in two minds about recapping this one, because despite
of the good shape
of
the PSU my sources indicate the LXF parts have also
suffered from the
quaternary ammonium salt syndrome. I'll yet check the ESR for any
suspicious
raise.
Maciej