23 Jul
2021
23 Jul
'21
9:48 a.m.
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.
Anyone know where to find such monsters? In the UK ideally. I have looked on
Farnell, Digikey and Mouser. It all seems to be special order, minimum
quantity, long lead time etc.
Thanks
Rob
23 Jul
23 Jul
9:59 a.m.
On 2021-07-23 12:48 p.m., 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.
Anyone know where to find such monsters? In the UK ideally. I have looked on
Farnell, Digikey and Mouser. It all seems to be special order, minimum
quantity, long lead time etc.
Any reason you can't use the results of this search at Digikey?
https://www.digikey.ca/short/v73h57hh
Cheapest is CAD $40.33 and generally screw mount. I've filtered to three
reputable brands.
--Toby
Thanks
Rob
11:16 a.m.
I was looking at UK sites, but that is definitely an option, thanks.
-----Original Message-----
From: Toby Thain <toby at telegraphics.com.au>
Sent: 23 July 2021 17:59
To: rob at jarratt.me.uk; Rob Jarratt <robert.jarratt at ntlworld.com>; General
Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
Subject: Re: Sourcing Capacitors for my H7140 PSU
On 2021-07-23 12:48 p.m., 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.
Anyone know where to find such monsters? In the UK ideally. I have
looked on Farnell, Digikey and Mouser. It all seems to be special
order, minimum quantity, long lead time etc.
Any reason you can't use the results of this search at Digikey?
https://www.digikey.ca/short/v73h57hh
Cheapest is CAD $40.33 and generally screw mount. I've filtered to three
reputable brands.
--Toby
>
>
> Thanks
>
>
>
> Rob
>
>
> 
24 Jul
24 Jul
5:51 a.m.
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
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.
1252
days inactive
1253
days old
4 comments
3 participants
participants (3)
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cube1＠charter.net -
robert.jarratt＠ntlworld.com -
toby＠telegraphics.com.au