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EPSON AcuLaser C4000  Quick Reference
Clean Sensor
Open cover A and remove the transfer unit 
temporarily. Wipe the transparent plastic 
window at the back of the transfer unit with 
a soft cloth, then reinstall the transfer unit. 
Close cover A to clear this error. 
If the error still remains, replace the transfer 
unit with a new one.
Collate was disabled
Printing by specifying the number of copies 
is no longer possible due to a lack of memory 
(RAM) or free disk space on the optional 
Hard Disk Drive. If this error occurs, print 
only one copy at a time.
To clear this error, select Clear Warning 
from the control panel’s Reset Menu. For 
instruction about accessing the control panel 
menus, see “How to access the control panel 
menus.” 
C Toner Low
See “XXXX Toner Low.” 
C Toner Out
See “XXXX Toner Out.” 
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 N 
Start/Stop to print on the back of the next 
sheet, or press the q Job Cancel 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.
Face Down Full
The output tray is full of printouts, and the 
printer has stopped printing. Remove the 
printouts from the output tray, and press the 
N Start/Stop
 button to continue printing. 
The output tray can hold up to 250 sheets.
Form Data Canceled
Unable to store form overlay data on the 
printer’s optional Hard Disk Drive. Either 
the drive is full, or the maximum number of 
form overlay files has been reached. Delete 
any form overlay files you no longer need, 
then try storing the new overlay again.
To clear this error, select Clear Warning 
from the control panel’s Reset Menu. For 
instruction about accessing the control panel 
menus, see “How to access the control panel 
menus.” 
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.