Epson AcuLaser C4000 Reference Manual page 335

Worn TransferUnit
This message warns you that the transfer unit is near the end of
its service life. You can continue to print until the
recommended to maintain high print quality.
To clear this warning message and continue printing, select
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 166.
Write Error ROM A/Write Error ROM P
This message indicates an internal error in the printer. Reset the
printer. If this error persists, consult your dealer.
Wrong Photoconductor
An inappropriate photoconductor unit is installed. Install only
the photoconductor unit listed in "Consumable products" on
page 13.
See "Photoconductor unit" on page 256 for instructions on
replacing the photoconductor unit.
XXXX Toner Cart Out
The indicated toner cartridges are not installed in the printer. (The
letters C, M, Y, or K appear in place of XXXX and indicate the
colors Cyan, Magenta, Yellow, and Black respectively.)
Install the indicated cartridges. See "Toner cartridges" on page
251.
error message appears, but early replacement is
Troubleshooting
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