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'[OT]: repairing an ultrasonic cleaner: pics'
2002\07\01@220541 by Mark Skeels

picon face
Hi, List.

A friend of mine is setting up a dental clinic at the local rescue mission
in town. As you can imagine, money is tight.

He got an ultrasonic cleaner with a bad transducer and he asked me to see if
I could repair it.

At the link below, you will see a picture of the bottom of the tub; and a
closeup of the damaged transducer.

http://www.geocities.com/meskeels/index.html

I am wondering if any of you have an familiarity with these type of
transducers.

Can you tell me:

1. Where to get them, and
2. How to remove them and install them. They are bonded directly to the
bottom of the tub with some kind of
   epoxy, or something.

Is this repairable?

Thanks, folks, for any help you can provide.
Mark Skeels
Engineer
Competition Electronics
http://www.CompetitionElectronics.com
spam_OUTmeskeelsTakeThisOuTspamearthlink.net

Soli Deo Gloria!

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2002\07\02@010445 by Jinx

face picon face
> http://www.geocities.com/meskeels/index.html

Phew....BIG jpgs for a 56ker !!

{Quote hidden}

I've had the same thing with jewelers/watchmakers US tanks, and asked
the list a couple of years ago with no real result. Those connections to
the ceramic are buggers to fix. The last one I had to try and repair was
a very old valve job that really was on its last legs all round and
eventually
got tossed - cheaper and less fuss to get a new one. I did fax the mftr in
New Jersey (a man called Richard Less, who I'm guessing doesn't
appreciate hypocoristics, look it up) and they could supply a new pair of
matched transducers for a horrible price. The best I've ever managed
was with conductive epoxy held on by silicone gunk, but it's never the
same as the way the factory does it. Cheered you up ?

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2002\07\02@041729 by Alan B. Pearce

face picon face
>who I'm guessing doesn't
>appreciate hypocoristics, look it up)

Tried to in Yahoo, and apparently the Aussies have a lot of them, but
otherwise I'm not much the wiser :)

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2002\07\02@043643 by Jinx

face picon face
> >who I'm guessing doesn't
> >appreciate hypocoristics, look it up)

hypocoristic - noun - (skip a lot of Greek derivations) - to call
by an endearing or familiar name. eg Bill for William, Tony
for Anthony. So Mr Richard Less might known as.........???

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2002\07\02@161827 by Roman Black
flavicon
face
Hi Mark, first, work on the assumption that that
transducer is FUBAR and you have nothing to lose.
Secondly, try scratching/grinding all the carbon
from it, and even grinding away some of the piezo
element in that portion of it if you have to.

After that you will probably find it is still 95%
of rated power and within acceptable freq limit.
ie, it's fixed. :o)
-Roman


Mark Skeels wrote:

> He got an ultrasonic cleaner with a bad transducer and he asked me to see if
> I could repair it.
>
> At the link below, you will see a picture of the bottom of the tub; and a
> closeup of the damaged transducer.
>
> http://www.geocities.com/meskeels/index.html

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2002\07\02@163327 by Dave King

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face
At 06:17 AM 03/07/02 +1000, you wrote:
>Hi Mark, first, work on the assumption that that
>transducer is FUBAR and you have nothing to lose.
>Secondly, try scratching/grinding all the carbon
>from it, and even grinding away some of the piezo
>element in that portion of it if you have to.
>
>After that you will probably find it is still 95%
>of rated power and within acceptable freq limit.
>ie, it's fixed. :o)
>-Roman

Is that the usual failure mode for those things? And the
why not give it a try fix?

Velly Interesting.

Dave

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