Epson AcuLaser C1900 Reference Manual page 308

Waste T BoxNearfull
The waste toner collector is nearly full of toner. You can continue
to print until the Replace Waste T Box error message appears,
but early replacement is recommended to maintain high print
quality. See "Replacing the waste toner collector" on page 251.
Worn Fuser
This message indicates that the fuser unit is near the end of its
service life. Turn the printer off, then replace the fuser unit with
a new one. Contact your dealer."Fuser Unit" on page 238
To clear this warning message and continue printing, select Clear
Warning from the control panel's Reset Menu. See "How to access
the control panel menus" on page 199 for instructions.
Worn Photoconductor
This message indicates that the photoconductor unit is near the
end of its service life. You can continue to print until the Replace
Photocondctr error message appears, but early replacement is
recommended to maintain high print quality.
To clear this warning message and continue printing, select Clear
All Warnings from the control panel's Reset Menu. See "How to
access the control panel menus" on page 199 for instructions.
Worn Transfer Unit
This message warns you that the transfer unit is near the end of
its service life. You can continue to print until the Replace
TransferUnit error message appears, but early replacement is
recommended to maintain high print quality.
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.
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Troubleshooting