Do you have programming layout for it. You have to have it to change text. It is normally under your normal product sheet. Also, is it the USA or European version of the 1350?
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If anyone needs more information, the TEC MA1350 (f) manual is here:
http://the-checkout-tech.com/manuals/cashregisters/TEC_MA-1350_owners_programming_manual.html
Registerman
June 2011