> -----Original Message-----
> From: Maciej W. Rozycki [mailto:ma...@linux-mips.org]
> Sent: 29 August 2017 01:06
> To: r...@jarratt.me.uk; Rob Jarratt <robert.jarr...@ntlworld.com>; General
> Discussion: On-Topic and Off-Topic Posts <cctalk@classiccmp.org>
> Cc: 'Tapley, Mark' <mtap...@swri.edu>
> Subject: RE: PSU Input Rectifier Question
> 
> On Tue, 29 Aug 2017, Rob Jarratt via cctalk wrote:
> 
> > Not really no. The base of the capacitors is actually touching the
> > board, so I can't get under it to cut anything anyway, which is why I
> > am thinking I would have to cut the tops off them. Even if I could cut
> > one of the leads, I can't solder a capacitor underneath as that is
> > where the board is mounted into the enclosure, there is only room for
> > the mounting standoffs on the underside.
> 
>  If you need to replace the caps anyway, then I think just cutting through
the
> outer PET sleeve should do as chances are it's only the sleeve that's got
glued
> and not the leads or the closing cap.  Then you might be able to just pull
the
> inner aluminium can containing the capacitor itself from the sleeve and
with
> the component proper out of the way get rid of any remains from the PCB.
> 

Thanks Maciej,

I would just like to make doubly sure, before cutting into the outer body of
the caps, am I likely to hit any gotchas? Just how wet are they inside, do I
need to take any precautions with the electrolyte?


>  NB the originals are just snap-in capacitors AFAIK, e.g. Chemi-Con KMH
series
> (I can't figure that out from your photos and luckily none of my H7878s
has
> failed so far, so I haven't made this a part list for this PSU for
myself), still
> manufactured, so modern replacements should do.  With the PCB hole
> diameter supposed to be 2mm by the manufacturer's spec I wouldn't be
> bothered with a small lead pitch variation, you can always bend the leads
> slightly as there's some space between the closing cap and the rim that
rests
> against the PCB.
> 


I did wonder if there would be enough tolerance. I have never encountered
these snap-in ones before, I don't know what they are like. Sounds like I
can try some snap-ins, which widens the choice immeasurably.


>  Also I would't be bothered about the LED holder getting damaged; it's a
> standard piece, available online.  I can dig out the part numbers,
separate for
> individual pieces of the holder (you can match different kinds against
each
> other, depending on your needs), if that would help; I ordered a bunch a
while
> ago for my own use.
> 

I found some LED holders/clips which do seem to fit the bill, although I am
not sure I see how you get the old LED out, unless you have to break the
thing.

Regards

Rob


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