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:ma...@linux-mips.org] > Sent: 30 October 2017 12:12 > To: r...@jarratt.me.uk > Cc: 'General Discussion: On-Topic and Off-Topic Posts' > <cctalk@classiccmp.org>; 'dwight' <dkel...@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
