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Casio LK-30 Key Board Piano

I have a Casio LK-30 keyboard that my daughter uses to practice. Where the electrical plug into the back of the unit is I'm not getting a good connection. I opened up the unit and the circuit board connection where the plug in adapter soldered connection to the circuit board is appears to have one of theese connections slightly seperated. Can I order a new circuit board. The part number stamped on the circuit board is JCM470-MANM A.
Thank you,

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I have the same problem. I was thinking one solution for us, but I don't like it might be to solder the power supply on and skip that female plug entirely. To do that, you cut the male end off the transformer/power supply wire (if you don't want to ruin your transformer/power supply you can buy another power supply at Best Buy for $10 - Dynex DX-C1109). Then strip the ends from each wire from the power supply so you have some bare wire showing on each wire. One goes on the spiral thing sticking up from the JCM470 board, the other goes anywhere you want on the red wire coming from the battery compartment. You should test before you solder to make sure you the proper one on the proper wire and that you therefore have power to the unit and it makes a sound. But its a sloppy fix. While it should work perfectly, the power pack then can't be changed unless you solder and unsolder it each time. Another solution is to find a broken LK-30 or LK-33 and rob the circuit board if it still works on the parts machine. Trouble is if you find one and its not near you it costs some money to ship these. At some point its just easier to buy a used one on Ebay or, I guess.

Posted on Feb 24, 2008

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  • junglecat Feb 25, 2008

    If you didn't think my last idea was sloppy enough, here is one thats even sloppier, but at least it doesn't require any soldering. I just tried it and it worked okay. That spiral thingy sticking up on the circuit board forms the ground on the battery pack. If you trade the red wire to the battery compartment, you will now see which is positive and ground. I took my two stripped wires, and then with ONLY TWO batteries in the power pack, I used a couple of dead batteries to squeeze and hold in place the wires from my transformer. That way, power from my Best Buy transformer flows into the unit at the positive and negative sides of the battery compartment, with the wires being held in place by the dead batteries. As I said, its sloppy, but, also as I said, it avoided soldering and provided you don't move the unit a lot, it would work.

  • junglecat Feb 25, 2008

    Also, I just found that taking the wires to the out by the latch mechanism for the battery compartment allows the battery compartment lid to pinch the wries and hold them in place. I'm playing it right now.

  • junglecat Feb 25, 2008

    In the comment before my last one, "If you trade" should have been "If you trace". Trace the wire is what I meant.



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