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Casio calculators are warranted by these companies:
Onflo http://www.onflo.com.hk/eindex.html
Multi-M http://www.onflo.com.hk/eindex.html
For contact and addres, please refer to the websites above.
Warranty service provider depends on where you bought your calculator. Look at the original package of your calculator and locate the warranty sticker. If it's issued by Onflo then go to Onflo for repair; otherwise, go to Multi-M.