If you want to disable the button sequence so users cannot easily lock or unlock the menus from the printer operator panel, change the password variable of the PJL JOB com- mand. Select any non-zero value for the password vari- able to prevent the button sequence from unlocking (or locking) the menus. Refer to the printer Technical Reference for more information about PJL commands.

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Lexmark 1200 manual Menus