Re: Loss of power to ultraview laserbed

Posted by Moulding, Dale on
URL: http://confocal-microscopy-list.275.s1.nabble.com/Loss-of-power-to-ultraview-laserbed-tp7591115p7591118.html

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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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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:

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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://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fimg
> ur.com%2Foy0jFWR&amp;data=02%7C01%7C%7Cd7bc04049c9e464333c808d834bd5cd
> e%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637317335206071174&amp;
> sdata=RGtJBpuvQZU31wI2ddEf88ASZL7FNKQzuAXPrHj16gM%3D&amp;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&amp;data=02%7C01%7C%7Cd7bc04049c9e464333c808d834bd5cde%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637317335206071174&amp;sdata=o4j5ps6donpIfxFyO0%2BiYqUSsUyVNKc2lXORcnZ4zVg%3D&amp;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&amp;data=02%7C01%7C%7Cd7bc04049c9e464333c808d834bd5cde%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C637317335206071174&amp;sdata=KP3mZ7FPtghUuesZwsza2HwAWL0ry9K%2FPbaRADLFISU%3D&amp;reserved=0). Power cut off behind the key. Its just got a single live cable going in then out again.
>
> cheers
>
> Dale
>

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Benjamin E. Smith, Ph. D.
Imaging Specialist, Vision Science
University of California, Berkeley
195 Life Sciences Addition
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