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How do I fix a JCM Gold J2500S Cash Register when it says OP on the screen?

How do I fix a JCM Gold J2500S Cash Register when it says OP on the screen?
Jesh, July 2020
I haven't worked with this model but it might be asking for an operator sign on password. If you can't make sales without an error, you probably need to sign on with a password (PIN number)

Registerman, August 2020
link Click here to see other fixes for JCM.