Epson EPL-N2750 Quick Reference Manual page 20

A PostScript 3 ROM module not supported by this
printer is installed, or a supported module is installed
incorrectly. Make sure you are using the correct
PostScript 3 ROM module. If you are, try reinstalling the
module.
The ROM module in slot A is not supported by this
printer, or a supported module is installed incorrectly.
Make sure you are using a suitable ROM module for this
printer. If you are, try reinstalling the module.
The ROM module in slot B is not supported by this
printer, or a supported module is installed incorrectly.
Make sure you are using a suitable ROM module for this
printer. If you are, try reinstalling the module.
Paper is jammed in the tray, cassettes, covers, or other
devices indicated by . Remove the jammed paper.
See "Clearing paper jams" on page 1 for help with
clearing the jam. See "Preventing Paper Feed and Paper
Jam Problems" on page 1 for advice on preventing this
problem.
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