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How can I do a "Full system clear" on a Olympia CM721Plus cash register?

I purchased a second hand CM721 plus cash register, but it came with passwords inserted and no one knows what they are. According to the specialists I need to do a "full system clear" on the machine, but the manual does not explain how to do it. Can you help, please?
Dario Bettencourt, December 2008
http://olympia-busines.com/html/Download/index.php?dir=/Cashregisters/CM%20721%20726/User%20Manuals/English/

rdj phil, September 2009
Hi.
These are very rare. I have never been able to find info on RAM clearing them either. You might have to check with a dealer. Some models have removeable batteries which may cause the machinr to clear when you remove them.

Mark, December 2008
link Click here to see other fixes for Olympia.