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It is suggested to take the unit to get replaced by a professional. Download the manual here: https://www.casio.com/us/support/calculators/manual/?model=DM-1200BM You may also reach out to an authorized service center. https://casiosupport.zendesk.com/hc/en-us/articles/5649253564185-Parts-and-Repairs-US-Canada-Mexico-Authorized-Service-Centers?_gl=1*1gr5b02*_gcl_au*MjAzMTkyOTA1Ny4xNzYwOTgwODY0*_ga*OTEzNzEyMDk2LjE3NjYxODI5MjM.*_ga_GHQCVYYBRC*czE3Njc5MDE5MTQkbzgkZzEkdDE3Njc5MDIxODYkajYwJGwwJGgyMTA4ODU3NjAz
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