Epson C4100 - AcuLaser Color Laser Printer, Reference Manual

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Troubleshooting
If a transfer unit is already installed, turn off the printer, open
cover A, and remove the transfer unit. Then reinstall the unit
properly and close cover A. The error clears automatically if the
transfer unit is properly installed.
Install xxxx TnrCart
The indicated toner cartridges are not installed in the printer or
the protective tape has not been removed from a toner cartridge.
(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 Cartridge” on page
222.
If the protective tape has not been removed from a toner cartridge,
turn the toner cartridge knobs to the unlocked position and then
return to the locked position. Then remove the protective tape
from the toner cartridge. If that fails to clear the error, turn the
printer off and back on again.
Invalid AUX I/F Card
This message means that the printer cannot communicate with
the installed optional interface card. Turn off the printer, remove
the card, then reinstall it.
Invalid HDD
Either the optional Hard Disk Drive is damaged or it cannot be
used with this printer. Turn off the printer and remove the Hard
Disk Drive.
Invalid PS3
An optional PostScript 3 ROM module that cannot be used on this
printer is installed. Turn off the printer and remove the module.