Replacing Power LED on MicroVAX 3100/95 Power Supply

[Rob Jarratt]

Thanks for the offer, but I am in the UK. I have a few bits I need so I can order these parts soon.

Regards

Rob

> -----Original Message-----
> From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Nigel Johnson via
> cctalk
> Sent: 13 May 2020 11:30
> To: Rob Jarratt via cctalk <cctalk at classiccmp.org>
> Subject: Re: Replacing Power LED on MicroVAX 3100/95 Power Supply
> 
> If all you need it that little mounting collet, I have a dozen or so of them
> somewhere for the price of postage from Canada!
> 
> cheers,
> 
> Nigel
> 
> 
> On 13/05/2020 02:23, Rob Jarratt via cctalk wrote:
> > 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
> >
> >> -----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
> > still
> >> 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>.
> >>
> >>>> 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
> > as
> >> 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
> 
> 
> 
> --
> Nigel Johnson
> MSc., MIEEE, MCSE
> VE3ID/G4AJQ/VA3MCU
> 
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>     Nigel Johnson <nw.johnson at ieee.org>
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