Well I don't know as I have asked a company to do the work. They seem to think the PSU will work with the originals but perhaps that they are not performing very well? I suppose I should ask them to keep the originals. I did wonder about reforming them.
Regards Rob > -----Original Message----- > From: cctalk <cctalk-boun...@classiccmp.org> On Behalf Of Jay Jaeger via > cctalk > Sent: 24 July 2021 13:52 > To: cctalk@classiccmp.org > Subject: Re: Sourcing Capacitors for my H7140 PSU > > On 7/23/2021 11:48 AM, Rob Jarratt via cctalk wrote: > > > I gave up trying to repair this PSU myself and I have got someone to > > do it professionally. It seems they have it working well but think > > that two capacitors should still be replaced. I think these are the > > two big "Coke Can" sized filter capacitors. The trouble is they seem > > to be unable to find any. The spec for them is 4500uf 200v DxH 76mm x > 145mm Qty. 2. > > > > Some particular reason you want to replace them? Perhaps instead measure > their ESR and if that measures OK, maybe just reform them (I do realize that > at 200v the reforming would be harder than for most.) > > I had a capacitor fail in my H7140 many years go, but it was not one of the > larger caps. I generally turn on my 11/24 every few months to do something > or other, so it tends to stay pretty happy. > > My experience, aside from the bad capacitors from 1999-2003 swelling up > and failing, and maybe two tantalums total (one recent one in a 3270 PC that > decided to short and release its "magic smoke") I haven't had very many > electrolytics fail - fewer than five - that actually needed replacing - one of > which was a smaller cap in my H7140. > > JRJ
