never installed battery since i buy it only once then i remove the battery the voltage is good 12v the power adapter work but the keyboard doesn't maybe it need a new borad where the plugs isCan't find a service manual.
First of all if there is a fuse it is internal. Casio doesn't make them user accessible.
Secondly, check the battery compartment for an old set of leaking batteries.
If the batteries are leaking remove them and carefully clean out the compartment with a dry toothbrush being careful not to drop any of the crud inside.
If there are no batteries inside, try installing a fresh set of new batteries and see if it powers up without using the wall adapter.
Also take a DVOM and measure the output voltage on the adapter.
Again I need to know if batteries were installed and if you live in an area with bad electrical power.
Gary
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