Epson AcuLaser C4000 Owner's Manual page 328

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" on page 171.
Check Paper Type
The media loaded in the printer does not match the paper type
setting in the printer driver. Media that matches only the paper
size setting will be used for printing.
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" on page 171.
C Toner Cart Out
See "XXXX Toner Cart Out" on page 330.
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" on page 171.
C Toner Low
See "XXXX Toner Low" on page 331.
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Troubleshooting