The Duplex Unit’s cover is open.
Duplex Mem Overflow
There is not enough memory for duplex printing. The printer prints only on the front and ejects the paper. To clear this error, follow the instructions below.
If Off is selected as the Auto Cont setting on the control panel’s Setup Menu, press the N Start/Stop button to print on the back of the next sheet, or press the + Cancel Job button to cancel the print job.
If On is selected as the Auto Cont setting on the control panel’s Setup Menu, printing continues automatically after a certain period of time.
Form Feed
The printer is ejecting paper due to a user request. This message appears when pressing the N Start/Stop button once to make the printer offline, and then holding down the N Start/Stop button for more than 2 seconds in order not to receive form feed command.
Image Optimum
There is insufficient memory to print the page at the specified print quality. The printer automatically lowers the print quality so that it can continue printing. If the quality of the printout is not acceptable, try simplifying the page by limiting the number of graphics or reducing the number and size of fonts.
To clear this error, select Clear Warning from the control panel’s Reset Menu. See "How to access the control panel menus" on page 149 for instructions.
184Using the Control Panel