12 May
2020
12 May
'20
11:23 p.m.
That's fantastic Maciej! I often buy from Farnell, so there is no issue with
getting those parts myself. When I have accumulated enough wants to warrant
an order I will get them.
Regards
Rob
still
-----Original Message-----
From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Maciej W.
Rozycki
via cctalk
Sent: 13 May 2020 02:41
To: Peter Coghlan <cctalk at beyondthepale.ie>; General Discussion: On-Topic
and Off-Topic Posts <cctalk at classiccmp.org>
Subject: Re: Replacing Power LED on MicroVAX 3100/95 Power Supply
On Sun, 10 May 2020, Peter Coghlan via cctalk wrote:
> > I seem to remember people saying it is quite difficult to replace
> > these, mainly because you can't get them out without breaking the
> > holder. Is that right? Has anyone done this successfully and have any
tips?
Is this the green LED in a H7821 PSU? I managed to get one out of the
holder with a bit of difficulty before I realised I could have left it
in place and the board can just about get past it when the plug at the
far end of the leads feeding it is plugged out from the board.
If the holder is the same as with the H7826 PSU, then it's a generic part
manufactured. I bought whatever was the minimum
quantity sold by Farnell
when I broke one along with the LED a few years ago. I still have a few
available and I could post one set once I am back to my UK home (which is
given the current situation regrettably not going to happen anytime soon).
Otherwise you can order it yourself:
<https://uk.farnell.com/broadcom-limited/hlmp-0103/mounting-clip-ring-
5mm-led/dp/8576378>.
as
> Are there any recommendations for a
replacement? If I remember
> correctly the LEDs used in those days were not as bright as modern
> ones and a modern one would end up being much brighter because of the
higher
voltage maybe?
Maybe it would be possible to tack blobs of solder onto what's left of
the leads on the original and use them to attach fine leads, digging
out a small amount of the LED casing around the leads if necessary?
I chose an LED matching the original colour, also of the case, as closely possible:
<https://uk.farnell.com/vishay/tlhg5205/led-5mm-green/dp/1045482>, but
still
haven't installed it (well, ahem, I need to fix
the PSU itself first), so
I can't
comment on the result. I could post one of those
along with the holder if
needed (subject to the condition noted above).
An LED will dim with use, so you may not be able to closely match a worn
one
with a brand new part, but I suppose you don't
actually need to be
*that* exact with your equipment, do you? Otherwise you can always put a
resistor in series to dim the light produced.
HTH,
Maciej