10 May
2020
10 May
'20
8:54 a.m.
In fixing my PSU I managed to break the leads to the LED on the front of the
PSU, probably through metal fatigue.
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?
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?
Thanks
Rob
10 May
10 May
9:56 a.m.
Rob Jarratt wrote:
In fixing my PSU I managed to break the leads to the LED on the front of the
PSU, probably through metal fatigue.
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.
As far as I recall, the holder is in two parts and I think the two parts have
to be separated before the LED will come out of the holder or the holder will
come out of the hole it is mounted in.
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?
Regards,
Peter Coghlan.
Thanks
Rob
12 May
12 May
9:40 p.m.
On Sun, 10 May 2020, Peter Coghlan via cctalk wrote:
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>.
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
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. 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?
13 May
13 May
2:23 a.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
6:29 a.m.
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
still
--
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
-----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
7:33 a.m.
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:
--
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
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
> 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).
-----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 > 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
1481
days inactive
1484
days old
6 comments
4 participants
participants (4)
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cctalk＠beyondthepale.ie -
macro＠linux-mips.org -
nw.johnson＠ieee.org -
robert.jarratt＠ntlworld.com