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Loss of power to ultraview laserbed

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Moulding, Dale

Loss of power to ultraview laserbed

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Hi all,

the power to my favourite scope's laser bed has died, and I wonder if anyone knows of a service option in the UK, or has any advice for a home fix. The power supply has been playing up for a while, often takes a few turns of the key (https://imgur.com/oy0jFWR) before it powers up. Now it has finally died. No power at all to the distribution board (https://imgur.com/lWaQHKm). Does anyone know if I can simply replace this component?(https://imgur.com/p3HjtYB). Power cut off behind the key. Its just got a single live cable going in then out again.

cheers

Dale

Benjamin Smith

Re: Loss of power to ultraview laserbed

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I've definitely had switches and switch encoders fail in the past, and they
often seem to be the weak point (if you look up the specs a lot of them
have a pretty limited cycle rating). The easiest thing to do would be to
power down the device and let it sit for a bit (for the caps to discharge),
and then using a multimeter measure the resistivity between the two wire
contacts with the switch open and closed. Also, jostle the key a bit and
see if this modulates the resistivity. If the switch needs to be replaced,
then replacing the part should be pretty trivial. At best, Digikey or
Mouser have the exact same part in stock. if not, just get a similar
diameter key switch that has the same NO/NC configuration as the current
switch.

Good luck,
Ben Smith

On Thu, Jul 30, 2020 at 7:12 AM Dale Moulding <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
> Post images on http://www.imgur.com and include the link in your posting.
> *****
>
> Hi all,
>
> the power to my favourite scope's laser bed has died, and I wonder if
> anyone knows of a service option in the UK, or has any advice for a home
> fix. The power supply has been playing up for a while, often takes a few
> turns of the key (https://imgur.com/oy0jFWR) before it powers up. Now it
> has finally died. No power at all to the distribution board (
> https://imgur.com/lWaQHKm). Does anyone know if I can simply replace this
> component?(https://imgur.com/p3HjtYB). Power cut off behind the key. Its
> just got a single live cable going in then out again.
>
> cheers
>
> Dale
>

Moulding, Dale

Re: Loss of power to ultraview laserbed

*****
To join, leave or search the confocal microscopy listserv, go to:
http://lists.umn.edu/cgi-bin/wa?A0=confocalmicroscopy
Post images on http://www.imgur.com and include the link in your posting.
*****

Hi Ben,

Thanks for the advice, I didn’t know where to start looking for the part, googled a few terms, but somehow didn’t think to try 'key switch'!
Thanks also to the off list replies, if I can’t do it myself I've a few recommendations for help.

Cheers

Dale

-----Original Message-----
From: Confocal Microscopy List <[hidden email]> On Behalf Of Benjamin Smith
Sent: 30 July 2020 20:17
To: [hidden email]
Subject: Re: Loss of power to ultraview laserbed

*****
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Post images on https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.imgur.com%2F&data=02%7C01%7C%7Cd7bc04049c9e464333c808d834bd5cde%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637317335206071174&sdata=apaquwAwFmeBrC9XYhbHYi1zry3oWy87Kw2WgW371Q0%3D&reserved=0 and include the link in your posting.
*****

I've definitely had switches and switch encoders fail in the past, and they often seem to be the weak point (if you look up the specs a lot of them have a pretty limited cycle rating). The easiest thing to do would be to power down the device and let it sit for a bit (for the caps to discharge), and then using a multimeter measure the resistivity between the two wire contacts with the switch open and closed. Also, jostle the key a bit and see if this modulates the resistivity. If the switch needs to be replaced, then replacing the part should be pretty trivial. At best, Digikey or Mouser have the exact same part in stock. if not, just get a similar diameter key switch that has the same NO/NC configuration as the current switch.

Good luck,
Ben Smith

On Thu, Jul 30, 2020 at 7:12 AM Dale Moulding <[hidden email]> wrote:

> *****
> To join, leave or search the confocal microscopy listserv, go to:
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists
> .umn.edu%2Fcgi-bin%2Fwa%3FA0%3Dconfocalmicroscopy&data=02%7C01%7C%
> 7Cd7bc04049c9e464333c808d834bd5cde%7C1faf88fea9984c5b93c9210a11d9a5c2%
> 7C0%7C0%7C637317335206071174&sdata=6J3sETo1fQlXa8vJ0E7STVyOV9xN%2B
> AHbgfJMjBG0v1o%3D&reserved=0 Post images on
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.imgur.com%2F&data=02%7C01%7C%7Cd7bc04049c9e464333c808d834bd5cde%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637317335206071174&sdata=apaquwAwFmeBrC9XYhbHYi1zry3oWy87Kw2WgW371Q0%3D&reserved=0 and include the link in your posting.
> *****
>
> Hi all,
>
> the power to my favourite scope's laser bed has died, and I wonder if
> anyone knows of a service option in the UK, or has any advice for a
> home fix. The power supply has been playing up for a while, often
> takes a few turns of the key
> (https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fimg
> ur.com%2Foy0jFWR&data=02%7C01%7C%7Cd7bc04049c9e464333c808d834bd5cd
> e%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637317335206071174&
> sdata=RGtJBpuvQZU31wI2ddEf88ASZL7FNKQzuAXPrHj16gM%3D&reserved=0) before it powers up. Now it has finally died. No power at all to the distribution board ( https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fimgur.com%2FlWaQHKm&data=02%7C01%7C%7Cd7bc04049c9e464333c808d834bd5cde%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637317335206071174&sdata=o4j5ps6donpIfxFyO0%2BiYqUSsUyVNKc2lXORcnZ4zVg%3D&reserved=0). Does anyone know if I can simply replace this component?(https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fimgur.com%2Fp3HjtYB&data=02%7C01%7C%7Cd7bc04049c9e464333c808d834bd5cde%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637317335206071174&sdata=KP3mZ7FPtghUuesZwsza2HwAWL0ry9K%2FPbaRADLFISU%3D&reserved=0). Power cut off behind the key. Its just got a single live cable going in then out again.
>
> cheers
>
> Dale
>

--
Benjamin E. Smith, Ph. D.
Imaging Specialist, Vision Science
University of California, Berkeley
195 Life Sciences Addition
Berkeley, CA 94720-3200
Tel (510) 642-9712
Fax (510) 643-6791
e-mail: [hidden email]
https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fvision.berkeley.edu%2Ffaculty%2Fcore-grants-nei%2Fcore-grant-microscopic-imaging%2F&data=02%7C01%7C%7Cd7bc04049c9e464333c808d834bd5cde%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637317335206071174&sdata=35mBM6XGSF7uaee%2BzcwsEhCL3mvGnjQ3X0iLXEpfgT0%3D&reserved=0