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"err prt" error on Samsung ser6500 cash register?

I plugged in my cash register after about 18 months of sitting unplugged and I get this error message "err prt" on my screen. I cannot get rid of it or do anything else with the register. How can I remedy this, or where can I find a service manual for it?
Alex, November 2009
I have the same exact your problem

Phillip.Nguyen, August 2012
link Click here to see other fixes for Samsung SER6500.