gjjude

Yes, I did try running the keyboard on batteries only, but the same issue occurred. I did use a third party substitute adapter, because here in my area the original AD-5 adapter from Casio is hard to find. If indeed the adapter had an overvoltage, I'm just not sure why it happened so randomly when it was working fine for the past month. I''ll try the suggestions for basic checking with multimeter and visual inspection. Thanks!

Hi, I have a CTK-810 that is working fine for the past days. Just earlier, I noticed a mild spark noise when I used my keyboard connected through the adapter. After that, suddenly my keyboard won't turn on anymore. I re-plugged the adapter and tried to press the turn on button which causes the keyboard to turn on just for one second but then turns off again. The cycle repeats every time I press the turn on button. I tried to put the batteries but same symptoms happen. I just bought the adapter recently and it's just 1 month old, so I'm sure this has nothing to do with it. Do you have any ideas on what specific part of the keyboard to test? I don't want to scrap this keyboard because I think it's still working well and all keys are functional. I have attached a short video of the issue. Thanks, Jude ctk-810.mp4