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For future reference I will answer my own problem:
The problem was/is located on the board circled in green below. Swapping a board from a working generator allowed me to locate the problem. Board is essentially rows of transistors (C4237) and resistors. Now time to find the bad transistor...
Anyone familiar with ultrasonic generators? I'm hoping someone here knows which components typically fail inside the generator.
These 20kHz generators are rather basic Chinese units (see pictures) used for welding nonwoven plastic (basically thin plastic fabric). I have a good/working unit and...
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