Ultrasonic cleaner...need opinion

A customer brought this Peltsonic T1.9C to me dead.

After taking a close look at the whole thing, the only prolbem that I can find are the 2 blown power transistors (GSTU6030) gravely mounted on heatsinks.

The thing that makes me wonder is that the transducer mounted under the pan has pieces missing.(found them at the bottom of the case)

Both wires are firmly attached to it and there is no short, so the transisators weren't victoriously killed by that.
Could the transducer's reduced mass be the problem ?

So far yep.

As long as the output section in these devices is usually perfectly tuned

I think that running it up without a load (eg no fluid in the bath)
Indeed could have shortly caused the piezo to crack itself up. That would have presented the output stage with the wrong load, so the output transistors would have been next to go.

Thanks guys for the info.

I surmized it was the piezo wich partly cuased the trouble.

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Post edited by: jds2mpo, at: 2008/08/01 12:53