I guess you need to do a Cold reset.|
A cold reset unlocks menus that have been locked and resets control panel variables. However, it does not clear the values in the SERVICE menu (such as the serial number and page counts).
To perform a cold reset
WARNING! Performing a cold reset erases all of the EIO card information.
1. Turn the printer on.
2. As the printer performs its power-on sequence, press and hold Check button until all three lights on the control panel are lit.
3. When SELECT LANGUAGE displays on the control panel, press Up Arrow until COLD RESET displays on the control panel.
4. Press Check Button. The printer performs a cold reset and then continues its power-on sequence.