Mike Russ

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Mike Russ

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  • 06.08.2017
  • Teardown: Reverse engineering an ultrasonic cleaner
  • It appears to me that the phase of the T1A primary might have the start finish dot on the wrong side (should be on pin 2 not on pin 5 ? ) This would only be an error in entering the schematic and has nothing to do with why your unit is not going. There may be a shorted turn in the inductor mounted on the base plate. One of the feedback windings T1B or T1C may be open circuit or C1 / C2 may be faulty. There is not much to the circuit so it shouldnt be too hard to diagnose. Use a signal generator and CRO to test T1 and an LCR meter to test the inductor and capacitors (remove the caps from the PCB to test.