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Hi, I buy sell and repair electronic keyboards, unless the problem is really bad then try this:-
Remove as much dirt and dust as possible DRY. Use a vacuum cleaner and a clean paint brush with long soft bristles. Turning the keyboard upside down helps, work round each key, work from the back to the front of the key.
Assuming the keys are plastic.
You can use foam cleaner and sometimes isopropanol (a synthetic alcohol, used for cleaning in electronics) when needed, but Mr Muscle Kitchen is just as effective. There are other usable cleaners the important thing is they DO NOT contain lime scale remover OR bleach.
Spray the cleaner onto a "J" cloth and wipe the keys. Also upside down if possible. It is surprising how grubby the keys can get and some deposits can be removed with label remover. Use this on the cloth sparingly and rub gently.
Label remover is available from CPC, search CPC Farnell.
It's about hardwares.
Wiring connection sockets is loose.
Inside the korg PA50,Wiring connection to the keyboard is separate to left and right.
Open/disassemble your korg.
Look for connection cable to the left keyboard.
One end is on the keyboard,the other end is at the mainboard.
Unplug both of it, then mounted again.
For master volume,better buy new one.
The sensors are rubber, and don't usually crack. Most of the time they are dirty and can be cleaned with rubbing alcohol and Q-tips VERY carefully. Also be careful of the ribbon wires inside the keyboard. The keys should just snap in and out. I cleaned mine a little while ago, and now it works perfectly.
I just experienced my p85 with a key problem on the F# below middle C. You will need to disassemble the keyboard and usually the keys are groups of 6 - 8 keys. If you remove the group that has the problem you might be able to find the problem visually. Mine just involved removing and reinserting the F# key back into the assembly. Then reinstalling the group of keys. If you can't get the key to work properly, you will probably need to buy the group assembly from Yamaha.
Here is the spec sheet for the Roland E-09:http://www.rolandus.com/products/productdetails.php?ProductId=828 The Roland E-14 was manufactured in 1996 and the specifications are not easily available on the internet. If you are considering buying one (E-14) make sure it is in good shape with everything working and you can get it cheaper than a new E-09. If you really want to compare you will have to find a manual for a E-14 and download a manual for a E-09 and compare the features side by side. If you have an E-14 and are considering purchasing a new E-09 find a local dealer who is selling the new one and see if you can take yours there and compare them side by side. Comparison should be a personal decision. I might like a Chev and you might like a Ford. You pretty much have to decide for yourself. If you are buying one look at your budget and compare other keyboards with similar features. Also consider whether the amount of playing you will do might justify saving up some money to buy a higher end Roland if you are particular to Roland. Let me know if this helps.
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