SOURCE: can i change the DC 9V jack on my CTK - 541 music
If you are careful you can. Replace with exact same jack. Your jack has a switch contact that connects the batteries when NOT using the power adapter. You need to find one with exact same pin spacing and layout.
Search for one at Digikey.com an Mouser.com
Here is link to the power jacks, supposedly with the switch contact... compare the photos and spec sheet to match your connector.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Selection
SOURCE: purchased Casio Keyboard CTK-4000...it seems
Check for videos on YouTube. Also check for user's BLOGs for the Casio using Google. here usually isn't enough market for people to write 101 books as the technology and models change so fast.
Best way is to just dig in and try stuff and self-discovery results in learning stuff that sticks with you.
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