Epson AcuLaser C4000 Reference Manual page 325

Form Feed
Hold down the N Start/Stop button for more than two seconds
when the printer is offline to print the data that remains in the
printer.
Format Error ROM A
An unformatted ROM module has been inserted. If the ROM
module has been formatted, but is still unreadable, format it
again. If the ROM is still unreadable after reformatting, take the
module to your dealer for repair or replacement.
To clear this error, either press the N Start/Stop button or turn off
the printer and remove the ROM module.
Hard Disk Full
The optional Hard Disk Drive is full and you cannot save any
data. Delete the unnecessary data from the Hard Disk Drive. To
clear this error, select
Reset Menu. For instruction about accessing the control panel
menus, see "How to access the control panel menus" on page 166.
HDD Check
The printer is checking the Hard Disk Drive.
HDD Format ***%
The HDD is being formatted. The progress of the format is shown
as ***%.
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.
from the control panel's
Troubleshooting
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