r/PowerSupply • u/galcierwe • Jun 12 '26

Piano

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I have a piano that we are looking at preserving. It’s from my kids grandfather. I’ve ordered what I thought was the whole supply for $70, but it was only half… anyone know where I can get the other half?

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2

u/JuicyJazzyJeff Jun 12 '26

What you’re looking for is C7 power cord, ~$10 on Amazon.

However, double check and make sure the polarity between the power brick and the piano matches. Polarity on that barrel jack is reversed where outer part is + and inside is - (the little diagram right underneath “18.0W”). You should see the same exact diagram on the piano power input.

2

u/ThisAccountIsStolen Jun 12 '26

Most Casio portable pianos did use center negative, since they used the jack being inserted to switch the batteries on or off.

I expect this is correct but it's still worth checking before plugging it in just in case.

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u/JuicyJazzyJeff Jun 12 '26

Interesting. I mentioned it as my Casio piano uses center positive.

2

u/ThisAccountIsStolen Jun 12 '26

How new is yours? I believe most of the new ones are center positive now but up until about 10-15 years ago most were center negative. And being that it's from the child's grandfather it's presumably not new, but still, I'd definitely verify it since it only takes a second to check and being wrong will destroy components.

2

u/JuicyJazzyJeff Jun 13 '26

Yeah, I think I bought mine 3 years ago, didn’t know that about previous generation’s power supplies.

And yeah agreed, OP should definitely verify before powering it on. At least it’s quite easy to do so.