how to fix printing problem on er 4900?

There are many reasons. Broken head cable, faulty position sensor etc. really needs a technician to check it.
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If anyone needs information on this register, the programming manual is here:

http://the-checkout-tech.com/manuals/cashregisters/Samsung_ER-4900_dealer_pocket_programming_guide_manual.html

Registerman
May 2011