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Reply to "MTH Z 500 Transformer has constant 18 Volt output."

RRaddict2 posted:

This thing cannot be repaired, as I don't know how they did it but the two triacs are part of the PCB and cannot be removed except for cutting or grinding them off.

Those components should be remove-able albeit a PITA.  I believe those are so-called DPAK surface-mount packages like this:

DPAK

First de-solder/lift the two legs from their pads.  Then place your iron tip along the length of the tab and wait say 5-10 sec, it will melt the solder joint on the back of the package and the body will lift off the board.  Obviously the large "silver" area of the board acts as a heat sink stealing the heat from the iron making the job more difficult.  Your board might be salvage-able though I'm thinking some kind of solder-able thin copper foil might be involved instead of non-solder-able aluminum foil.

Yes, I'd like to see a photo of the other side of the board.

And, for the record, what part numbers did you order?

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  • DPAK

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

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