Replacing Power LED on MicroVAX 3100/95 Power Supply

[Nigel Johnson]

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

Amateur Radio, the origin of the open-source concept!


You can reach me by voice on Skype:  TILBURY2591

If time travel ever will be possible, it already is. Ask me again yesterday

This e-mail is not and cannot, by its nature, be confidential. En route from me to you, it will pass across the public Internet, easily readable by any number of system administrators along the way.
    Nigel Johnson <nw.johnson at ieee.org>

     
Please consider the environment when deciding if you really need to print this message