Apple ColorLaserWriter 12/600PS - Manual (Page 267)

Can’t communicate with the printer
If you cannot use the Apple Printer Utility to communicate with the printer
(for example, if you inadvertently turn off communication to all ports), you
must reset the configuration switch on the back of the printer.
Can’t close the printer’s door
If something prevents you from closing the door, try these steps:
m Make sure the transfer drum lever is closed correctly. (See the illustration
“Anatomy of the Printer” that appears at the beginning of Chapter 1.)
m Make sure the fuser oil cover is closed.
m Make sure the top cover of the printer is closed.
m Make sure the disposal box cover is closed.
Flip the switch to the left-hand position.
Then restart the printer and return the
switch to the right-hand position.
244 Chapter 13