Question about Casio Lighted Keyboard LK90STADMC

2 Answers

Need repair My casio does not turn on, either by adapter or batteries. When I used the batteries, it lights up for just a sec, then goes off. Any suggestions?

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  • Adda Feb 23, 2008

    I'm having the exact same problem with my casio CTK-671 i really need help plzzzzzzz.

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2 Answers

Yeah mine is too except I don't have a clue where the adapter is :-/

Posted on Apr 29, 2008

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  • 374 Answers

That is definately a repair issue. Contact them at 8007062534 and then keep choosing option 2. Do not let them transfer you to tech support because we will tell you to call repairs.

Posted on Apr 06, 2008

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Posted on Jan 02, 2017

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I have a Casio CTK 551 Keyboard, when the AC adaptor is connected and power is turned on, the Keyboard lights up for a few seconds then turns off. I noticed no red light lights up when the AC adaptor is...


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My casaio keyboard ctk811 only works off batteries goes off when connected to the new adapter that i have bought


Many people get "universal adapters" which OFTEN will not work.

When choosing an adapter you are best to get original equipment. If you don't do that, then you MUST:

1. Match the Voltage and whether it is AC or DC output.

2. Match the polarity

3. Check that the current capability is at least what is required..

4. Match the size of BOTH the barrel AND the pin. There are MANY sizes and the wrong size will not work.

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Replace the batteries and get an AC adapter for it! These do NOT work when voltage os too low.

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Does not fully poweer up


I had the same problem. You might try the keyboard on good fresh high quality batteries. If this solves the problem, buy another ac power adapter. Good luck!!

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