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cant open register & all keys are locked it displays a pp code next to amou?

I am unable to get any of the keys working as it is all jammed since I replaced the paper roll, Can you help please, thanks
carla, July 2010
It sounds like the Samsung code for printer jam. You usually turn off then on at the wall in REG mode to make it try again. Otherwise, press clear to try clearing the error. If it doesn't work, tell me which brand and model

Registerman, July 2010
link Click here to see other fixes for Sam4s ER-920.