Sourcing Capacitors for my H7140 PSU
cube1 at charter.net
Sat Jul 24 07:51:59 CDT 2021
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.
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