IBM 1220 - Manual (Page 82)

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Enabling Menus
What this message means:
The printer is responding to a request to make the menus available to all users.
What you can do:
Wait for the message to clear, then press Menu to view the menus from the operator panel.
See also:
Enabling the menus
Engine Warming
What this message means:
The printer is warming the fuser assembly to prepare for printing.
What you can do:
Wait for the message to clear.
Enter PIN:
=___
What this message means:
The printer is waiting for you to enter your four-digit personal identification number (PIN).
What you can do:
Use the operator panel buttons to enter the PIN you identified in the driver when you sent the
confidential job to the printer.
See also:
Holding a job in the printer