Apple ColorLaserWriter 12/600PS - Manual (Page 331)

18 Close the fuser access door and the paper pickup access door.
19 Replace the fuser oil bottle.
20 Close the printer’s door.
Replacing the transfer drum cleaning unit
1 If necessary, close the multipurpose tray.
2 Open the door to the paper pickup area.
Close the cover.
311 Replacing the Fuser