More switchmode power supply grief - Cisco IGS router
Peter Coghlan
cctalk at beyondthepale.ie
Sun Feb 6 17:43:31 CST 2022
"Maciej W. Rozycki" wrote:
>On Sat, 5 Feb 2022, Peter Coghlan via cctalk wrote:
>
> > > This PSU seems to have been used across various Cisco devices and I had
> > > one fail several years ago in a WS-C1202 Ethernet/FDDI switch, also having
> > > suffered from leaking caps. Back then RS still had it in stock at a hefty
> > > price of £489.60: <https://uk.rs-online.com/web/p/products/8338173/>, so I
> > > chose to recap the failed one and thanfully it has continued working ever
> > > since. You may try to enquire with the manufacturer.
> > >
> > > Good luck with bringing yours back to life!
> > >
> >
> > Thanks Maciej. I'll be surprised if the manufacturer has records of
> > what they used for the chopper in power supplies 30 years ago - who
> > knows if their design has changed between then and now. I'll be even
> > more suprised if they will talk to me about it but I guess it's worth
> > a try.
>
> I've checked their web site and they continue to offer a MAP80-4000G,
> which I suppose is just a minor update from the original, and is visually
> the same, as it seems from the datasheet dated 2021. So I'm fairly sure
> they have all the data. Those discrete semiconductor components do not
> change much, I was able to order exact replacements for another faulty
> device from 1990s a few years ago.
>
> They may offer you a paid repair or replacement service or if you're kind
> enough and they are reasonable, they may identify the single part for you.
>
> NB Mouser has the MAP80-4000G in stock actually, so if all else fails and
> you are determined to get the IGS running, you can pick a brand new one:
> <https://www.mouser.co.uk/ProductDetail/784-MAP80-4000G>.
>
Thanks again Maciej.
I've bit the bullet and unsoldered most of the electrolytic capacitors and
other components that seem to be in trouble. When I got the chopper
transistor out, I found that if I hold it at exactly the right angle to
the light, I can see that there are faint markings on it after all and it
turns out to be an IRFPE50 HEXFET. I was wrong about the cracked RIFAs
not being mains filters too, they are actually across L-E and N-E and
they seem to have between a few hundred kOhms and a few MOhms leakage too.
The driver transistor looks like it might be ok.
Regards,
Peter Coghlan.
> Good luck!
>
> Maciej
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