24 Jul
2021
24 Jul
'21
2:17 p.m.
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-bounces at classiccmp.org> On Behalf Of Jay Jaeger via
cctalk
Sent: 24 July 2021 13:52
To: cctalk at classiccmp.org
Subject: Re: Sourcing Capacitors for my H7140 PSU
On 7/23/2021 11:48 AM, Rob Jarratt via cctalk wrote:
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
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.