Epson Aculaser C1100 Series Instruction Manual page 218

Color Unmatched
The colors on your computer do not match the colors output by
the printer. The version of the driver that is installed and the
model of the printer's color screen are not compatible. Install the
latest version of the printer driver and printer firmware. For
details, contact your dealer or service agent.
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 take the
printer offline, then holding down the N Start/Stop button for
more than 2 seconds in order not to receive a 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
247 for instructions.
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Troubleshooting