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Repair Roland HP2700?

One key on my HP 2700 will not sound.
Nothing has been spilled on it. It was transported from one city to another.

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SOURCE: I have a Roland HP 101 digital piano however certain dont sound

White spirit is NOT what you should use. Mineral spirit leaves a residue film.

Use 99% isoprophyl alcohol.

ALSO inspect the contactboard for cracks by candeling with bright light behind it.

Posted on Nov 01, 2009

Testimonial: "bur isnt it strange that certain keys have stopped working? ie most the A keys"

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Will probably need to be diassembled and cleaned. Either a sticking key or a compromised contact on the circuit board. Any electronics repair shop should be able to fix this.

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EP-50's are notorious for problems with either the 4.65 voltage feed to the velocity sensitive keys or failure of the small zenner diaodes. Each key has a pair fo split circles on the circuit board under it. When you hit the key you connect each side of the circles and the harder you hit the keys the quicker the circuits close the louder the sound. Problem is if the voltage to either circle fails, due to bad solder, scratch on circuit board, failed diaode then the sound disappears. The fix is simple if you are knowledgeable on solder on circuit boards, can use a multimeter and can dissassemble and reassemble the keyboard. If you have to take it to a repair shop it is probably not worth fixing as this is not one of the better Roland products

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Replace broken hammer key on roland kr 575


I've actually repaired two broken hammer keys on my Roland KR-575, after paying $250 (TWICE) for a repairman to come to my house and fix two other keys.
The repair I completed was about four of five years ago. I searched the internet and found great instructions to print out. Unfortunately, I can't find them again. HOWEVER, I did find this video: Roland Keyboard Repair. It shows you the hardest thing about the repair - how to take the cover(s) off to get to the keys! The video is not as detailed as the instructions I used before - but pretty good. The parts cost me about $25.

Unfortunately (for me) I have yet another key to fix now. This time I will take pictures and notes and update here with my results. It might take several weeks though (I'm trying to finish a big school project). In the mean time, try the video. I don't recommend trying super-glue like the video says, but sometimes finding parts is difficult, so I guess that might be an option if you couldn't get the parts easily. I just don't think a weight repaired with super glue will last very long.

Here are a few suggestions to find the parts you will need:
My other advice is to keep careful track of all the different screws you take out - and away from kids, grandkids, and pets - so you can put them back in the right place after your key repair is finished. (The screws that is ;)

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I have a Roland HP 101 digital piano however certain dont sound


White spirit is NOT what you should use. Mineral spirit leaves a residue film.

Use 99% isoprophyl alcohol.

ALSO inspect the contactboard for cracks by candeling with bright light behind it.

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