Key repairs on Yamaha DX21

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Key repairs on Yamaha DX21

Postby feedphillipnow » Wed Oct 29, 2008 9:30 pm

I just got a Yamaha DX21 for a screamin' deal. It however has about half dozen keys that are not triggering, and a couple you really have to pounce on to play. Do the triggers get old and dirty? Or go bad on these? I'd like to open it up and try n' get it fixed.

Thanks!
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Re: Key repairs on Yamaha DX21

Postby Italo_DX » Wed Oct 29, 2008 9:36 pm

I've owned two DX21s in the past year and they've been absolutely bulletproof... it seems odd you are having key troubles. I'd suggest carefully opening it and looking at the contacts at the very least. Maybe a connector is coming loose and its a simple fix.
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Re: Key repairs on Yamaha DX21

Postby feedphillipnow » Wed Oct 29, 2008 9:41 pm

Yeah this is my first one. It's built like a tank, I like it!
I'll open it up and see if there is anything obvious, keeping fingers crossed its an easy fix.
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Re: Key repairs on Yamaha DX21

Postby feedphillipnow » Wed Oct 29, 2008 10:00 pm

I've gotten inside, it's FILTHY. I vaccumed out all the dust and particles. I took off this layer, its the rubber strip between the part where the bottoms of the keys and circuits meet, there is a lot of grime and crap I cleaned off. Can I use alcohol? Damp rag? I need something moist to get it perfectly clean, not sure what to use thats safe.

UPDATE:
I ended up using an incredibly mild rag I used to clean the top, which had a tiny bit of windex on it to clean. I went over the rubber slip piece between where the keys and the circuit board meet. It had dust and little ashy little pieces on it. Used some air in a can and put everything back together, it works like 100% new! Rock on ;)
Last edited by feedphillipnow on Wed Oct 29, 2008 10:54 pm, edited 1 time in total.
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Re: Key repairs on Yamaha DX21

Postby Jack Spider » Wed Oct 29, 2008 10:43 pm

Moved to Help.
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Re: Key repairs on Yamaha DX21

Postby Maschinengeist » Wed Oct 29, 2008 11:01 pm

To clean the rubber: just let the strips soaked in not-too-hot water and then put them out to dry

For the contacts (golden ones on the PCB) use a white Steadlher eraser. Pass it gently a few times to take off the dirt. Don't use anything rough (like pink eraser). Be gentle so you don't scrap the golden contacts. The eraser will turn black and it's normal. Clean the eraser and redo a few times in case of heavy dirt. You can use some 99% alcool with woden q-tips. But be careful: some go crazy and do damages. I prefer to use an eraser.

And then when everything is dry and seems clean, put the rubbers onto the contacts and make sure they all trigger. Don't forget to also clean the carbon tip inside the rubbers. Use the eraser. Check if they are not missing or damaged.
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Re: Key repairs on Yamaha DX21

Postby feedphillipnow » Wed Oct 29, 2008 11:25 pm

Sweet. Good tips. I think I did it right, she works like new!
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Re: Key repairs on Yamaha DX21

Postby Thetimeplease » Thu Oct 30, 2008 12:47 pm

feedphillipnow wrote:I vaccumed out all the dust and particles.


I'd recommend against using a vacuum cleaner to clean out electronic equipment, they can generate quite large amounts of static electricity (ESD = Bad). I'm glad you didn't experience any problems there.


If you've got access to a compressor etc., compressed air is in my limited experience the best way for cleaning out bulk amounts of muck.
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