Question about Casio Lighted Keyboard LK90STADMC
If you lucky, the power jack may be at fault since it switches from external to internal battery, but most likely the internal supply is what's damaged... IC regulator possibly. A quick voltage check with a volt meter at the power leads on the main board will verify battery or xfmr supply voltage, if voltage is present then look in close proximity for an IC regulator and check for an output.
Posted on Dec 22, 2008
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Posted on Jan 02, 2017
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