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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.
There is really nothing to be concerned about. The biggest enemy of electronic device is moisture. As far as failure, electronic device have the highest failure rate when brand new. I know this sound crazy but it is true. Since a lot of failure in electronic circuits is due to poor design, and manufacturing. Electronic components are very hardy things, and can withstand even temperatures that would kill a living thing. One last thing to mention on electronic is dust that has accumulated can ruin electronic circuits on high current sections that require fan to cool it down due to poor ventilation. Mechanical things such as gears and what have you should be ok. Mechanical things have the highest failure rate as time goes by (wear and tear). Since you store it in a climate controlled room the lubrication on the gears should still be ok.
To replace them, you will need to first remove the flip up lotion cartridge cover on the back. Then remove the 5 screws there to take off the back of the case. You can then access the batteries. You will need to 'unsolder' the old ones from the circuit board and then solder in the new ones.
If you are not equipped to do this yourself, shaveroutlet.com can do it for you. See link below
You need to know how many pins you need (count the holes in whatever you are plugging the cables into). After that, just buy a cable in any tech store, or on Amazon (Amazon's cables are here: http://www.amazon.com/s/ref=nb_ss?url=search-alias%3Daps&field-keywords=din+cable&x=0&y=0).
In Windows, open it with Cartesian Products CPC Tool Microsoft Internet Explorer with Cartesian Products CPC View ax plugin Mozilla Firefox with CPC Lite pi plugin LizardTech Document Express
The electronic control board will have to be replaced. You can search online or call Sears (they can order just about any type of part for any type of product for you) with a model and serial number. Generally, the electronic control board is not that difficult to replace.