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Some Casio Keyboards use 9V DC (center negative) others 12V DC (center negative).
If check what voltage your Keyboard use. Generic AC adapters are usually center positive. So you have to invert the wire with a new DC plug to make it center negative,
Easiest is to buy a Casio ac adapter made for your keyboard from a Casio retailer.
I would suggest getting a service manual for the unit. I have two of these units. I opened one to restore a key spring once. There are ribbon cables to the upper shell that have to be disconnected or left if the shell top can be placed behind the unit. The key contacts for most of these keyboards are conductive rubber "pills" in silicone rubber domes that get pressed onto traces on a circuit board under the keys. There are two contacts per key with one closing first. This is the way key velocity is measured. These keys have coil springs for return that have a cone at the end of the spring that fits a slot in the back of the key rearward of the pivot point. Clean the pills AND the circuit traces GENTLY with ONLY 99% isoprophyl alcohol and Q Tips. There are a lot of screws to remove to open the unit. Keep track of what length and thread type for re-assembly.
The resting (centering) of the PB wheel has a problem. It is LIKELY mechanical in nature. You will have to open the unit to investigate or take in for servicing. If you open it yourself, have two people to help hold the two parts of the shell to avoid damaging the ribbon cables when opening.
First thing is to get a meter and verify that the power adapter is producing voltage that it is supposed to. You can get inexpensive meters at Harbor Freight for example. I am not sure what you mean by "several outlets"... I HOPE that is not several on the Privia because there is ONLY ONE correct place to put the adapter cord into the Privia.
If you mean wall outlets, verify them by plugging in a known good lamp or appliance to check the receptacle is good.
It is NOT likely the keyboard is "killing the speakers"... OR the headphones for that matter.
I suspect the problem is bad switch contacts in the headphone jack that cut off the speaker line outputs when headphones are plugged into the pro keys. These jacks are, to put it bluntly, JUNK... they are EASILY damaged by pulling the cable plugged into them sideways. You will need to service the unit.
I have two of these. First thing check your power adapter for output. Just because LED's are on doesn't mean there is correct voltage... There is no reset button... Cycling power serves to reset it.
ALSO check the power input connector... sometimes those get intermittent and break connection due to vibration and initial current surge when turning on.
You should immediately quarantine what you plugged in and compare it to the correct one.
IF you put too low aq voltage of the CORRECT polarity nothing should have happened.
If you put backwards polarity of any voltage the regulator is probably fried internally and possibly an input bypass cap. Also if you put an AC adapter and it wants a DC the same destruction could happen.
if you put too high a voltage, possibly the power input cap may be bad.
It appears that the correct supply is the PA3C which is a 12 volt, 700ma with positive on the center pin.
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