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ER 420M Sam4s till Error message?

All key positions on the till are 'CLOSED' and initial clear caused this to appear, can anyone help?
BLue, December 2013
This is normal. Your machine is closed until you open it. To open it for trading, simply enter your clerk secret (PIN) number followed by the clerk button. If you have forgotten your code, there is a programming manual here:

http://the-checkout-tech.com/manuals/cashregisters/Samsung_ER-420M_operating_programming_manual.html

Registerman, December 2013