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My JCM GOLD J2500s cash register display "OP", what is that mean?

JCM GOLD J2500s display "OP" , can not clear, other keys do not working, what is that problem?
Amanda, May 2015
Yes its me again, can you plaese help me in Z mode it comes up with error E0003,? how do I reset this

Lourens, March 2017
OP error code reset?

Lourens, March 2017
link Click here to see other fixes for JCM.