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Beware of an adjustment complexity with an new kind of poweroutlet automatic voltage regulator avr , have you measured the generator UNLOADED for 230 volts ?
because it can be normal that 67 volts output changed when you connect an paint heat gun i was surprised a few weeks ago that i get an GENMAC 8000 that is a look a like generator coming from china build . first i was measuring some of the same output AC instead of 230volts.
Make sure you have the CORRECT adapter for the unit. It should say Yamaha on it and match the voltage and polarity. Thest the output with a meter. Common problems that happen to the piano itself causing the symptoms is a broken power connector or broken solder at the connector. Use a meter and verify the adapter is producing output. Expect the output to be a bot higher than listed when not plugged into the piano as there is no load on the adapter.
this is a brushless generator, that means it has a condensor, this is a "normal" fail, see it happen a lo on brushless. Upgrade to a metal can condensor (gets less heat and is a better construction and the problem should be less frequent...
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