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in response to mark's answer-ER-5100?

unable to do anything with this register. register was used and have no idea what numbers or codes they used to sign on clerks.can"t even go into program mode and create a clerk .....keep getting a E1 error. can't run a x or z without signing on a clerk.
mike wies, October 2008
Ok Mike. Next we try an initial reset.
This will tell the machine to stop what it is doing, and allow us access without losing data.

Turn key to P mode.
Turn power off at the wall.
Hold SUBTOTAL button down. Keep your finger on it.
Turn power on at wall, and wait for printer to run, then let go of SUBTOTAL.

Leave key in P mode.
Press CASH
Press SUBTOTAL

If it works, you should get a list printed showing the programming. Look for 'CLK1 CODE' on the list. The number next to it is your logon code.
Go back to REG mode, and try that clerk code to logon.

Mark, October 2008