If Printing Has Already Started

You can cancel a print job from the printer's control panel.

Press the [Job Reset] key.
Press [Current].
To resume printing jobs, press [Resume].
Press [Yes] to cancel the print job.
Press [No] to return to the previous display.

If the printer is connected to the computer using a parallel cable, sent print jobs may be canceled if the [Job Reset] key is pressed while "Please wait..." is displayed on the control panel. After the interval set in [I/O Timeout] in Printer Features has passed, the next print job can be sent. A print job sent from a different client computer will not be canceled in this case.
You cannot stop printing data that has already been processed. For this reason, printing may continue for a few pages after you press the [Job Reset] key.