Casio WK-220 Black Keys Replacement

Place device face-down

Remove 23 16mm screws with Phillips #2 screwdriver

Pry up long back panels with plastic opening tool

Remove panels

Turn device around so keys are face-up

Pull back panel away from keyboard and out of the way

Remove speaker(s) if necessary to access desired key section(s)

Use Phillips #2 screwdriver to remove two 16 mm screws (circled in red)

Pop wires out of plastic holders so speaker can be moved out of the way

Move speaker out of the way

Remove 4 18 mm screws (circled in red) from desired key section using Philips #1 screwdriver

Gently push white keys away from screws and pull up to remove from keyboard. Repeat this with the black keys

Reassemble with new/cleaned keys

Remove second white section covering desired black section

Remove screws using Phillips #1 screwdriver

Push keys away from screws and pull up

Use plastic opening tool to pry up black key section

Remove black key section

Reassemble with new/clean black key section