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Hey mate. Can you find where the transformer connects. If you can unplug from the wall and measure the resistance across the primary (230v side) and also the secondary.
Sounds like the transformer has either shorted out the winding or even gone open circuit.
When measuring the voltage on secondary try earth the hand piece out. What happens. Any spark at all? Does the voltage dip to near zero?
If it does it indicates a open circuit on the transformer and the 3v you get is just induction. You will get voltage with induction but no current and when the circuit is completed will drain it to zero.
How that makes sense. Give me Call if you want anytime today
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