10/9/2023 0 Comments Yamaha psr e403 power supply![]() I have removed the PCB there are very few components on this section. On visualize inspection everything looks ok. ![]() This type of Humming sound problem are most likely due to either earthing problem or due to some faulty capacitors hence I decide to directly check the amplifier section. Hence we opened the keyboard for inspection. On testing I observed the humming sound coming from both the speakers and it kept gradually increasing. My nephew called me to check on his Yamaha Keyboard with the problem of humming sound.
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