Epson AcuLaser C4000 Owner's Manual page 339

Service Req xyyy
A controller error or a print engine error has been detected. Turn
off the printer. Wait at least five seconds and then turn it back on.
If the error message still appears, write down the error number
listed on the LCD panel (xyyy) and turn off the printer, unplug
the power cord, and contact a qualified service representative.
Standby
The printer is in the standby mode. The printer switches to the
online mode automatically when the printing data is sent to the
printer.
Unable Clear Error
The printer cannot clear an error message because the error status
still remains. Try solving the problem again.
Worn Fuser
This message indicates that the fuser unit has reached the end of
its service life. Printing after this message appears is not
guaranteed. Turn the printer off, then replace the fuser unit with
a new one. See "Fuser unit" on page 270 for instructions.
The error clears automatically after you replace the unit and close
all printer covers.
Worn Photoconductor
This message indicates that the photoconductor unit has reached
the end of its service life. Printing after this message appears is
not guaranteed. Turn the printer off, then replace the
photoconductor unit with a new one. See "Photoconductor unit"
on page 263 for instructions. The error clears automatically after
you replace the unit and close the printer covers.
Troubleshooting
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