Casio WK200 left speaker stopped working

The left speaker of my Casio WK200 just stopped working. Everything else including the right speaker is fine. Any ideas?

Does to headphone jack output the left side?

When I plug in the stereo head phones, I hear sound in both sides.

Then it’s probably either the speaker is bad, or the amplifier chip on the amp assembly board is bad.
After opening the keyboard to access the speakers, take a spare speaker with wires connected and run the +/- to the terminals of the speaker that’s not working. If the spare works then your speaker is bad and needs to be replaced. Otherwise replace the amp board.

Hope this helps!

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