Electronic – Replacing a transistor when I can’t find any info on it

transistors

I am attempting to repair a Sonix Ultrasonic Cleaner and I have found that the only parts that have gone bad are two power transistors, SIV300004. I emailed Sonix and they want to sell me the whole control board not just the part. And they didn't want to give me any more info like schematics or a data sheet.

I would need two control boards and they would cost more than this thing is worth. I have searched Google four a few hours and can only find a few references from others from years ago who are looking for the same part. I can't even figure out who makes this SIV300004, If I could I would contact the manufacture.

So I was thinking that maybe there is some way to figure it out from the circuit. Can that be done? If I were to draw out the schematics would I be able to figure out what specs I would need for a replacement transistor? How would I go about this. Or is there any other way to figure out what I can use?

Thanks for the help,
Russ

Best Answer

Yes. Give us the circuit and we will be able to spec a transistor for you.

AND a photo to go on with (and comment on thos below).

A copper side view of PCB as well would help muchly (for the terminally enthused to start in on).

If you have a working unit so much the better.
I you can tell us the supply voltage, power taken and frequency it would help greatly. That would be enough to hazard a good gusstimate. Even voltage would possibly be enough !!!

BUT the more you tell us the better.
For example, telling us that it was in a metal T03 case on a heatsink about xxx big and was made in 2008 or ... would help.

eg - like this? Yes? :-)

enter image description here

May be used elsewhere in system, too? Board level parts supplier here says

Item # Description Price
SS8G-PCA080 Generator Board, Acousti-pulse 6580 $91.91
SS8G-PCA120 Generator Board, Acousti-pulse 6580 $91.91


and... . Transistor is about certain to be the same given the peep of part number seen.

enter image description here

Item # Description Price

SS8G-PCA120X2 Generator/Driver Acousti-Pulse/Dual $165.44


You didn't tell us you knew board part numbers !!!! More photos

Here and
here and
even Sonix's own photos are useful