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Like others here, I am not an electronic guy. I have, however, adapted a few power supplies from 110 to 220. They are usually quite easy to understand, if not adapt or simply swap. Obviously, I tested them with a multimeter before and after the modification. I never contacted manufacturers in the process and did not expect them to provide any useful/reliable informations anyway. I understand your "tech" did nothing. In that sense, he is not to blame. Where he is to blame is that he clearly should have told you "under no circumstances should the device be plugged in 220v as it stands".
The small modern switching power supplies operate on a different principle. The big "coil based" ones are basically one way analog dividers.
The small modern switching power supplies operate on a different principle. The big "coil based" ones are basically one way analog dividers.