the problem is that you need to reset the counter of the photoconductor unit. From the official site of lexmark, i find this solution.
Step
Action
1
Enter the printer's
Configuration menu:
- Power off the printer.
- On the printer's operator panel, press and hold the select button (
) and the back button ().
- Power the printer back on while keeping both these buttons held down.
- When you see the messages Performing Self Test or Busy on the printer screen, you can release both buttons.
- If the printer has successfully entered configuration mode, you will see a new menu with the heading CONFIG MENU at the top of the screen.
2
Press the right arrow button (
) until you see
Reset PC Cnt. Press
once. You will see
Reset. Press
again.
The printer will display a
Resetting PC Count Value message and go back to the previous screen.
3
Press
once.
4
Press
or
on the operator panel until you see
Exit Config Menu. Press
once. Selecting this will cause the printer to reboot.
If the counter has been reset correctly, the printer should return to a
Ready prompt.
5
If this does not clear the
PC Life Warning or
Replace Photoconductor message, power off the printer and attempt this entire procedure again. If the error remains after
two attempts, confirm that:
- The correct photoconductor unit is installed. The part number on the photoconductor unit should be E250X22G. If it is not, install the correct photoconductor unit into the printer.
- The photoconductor unit has not been refurbished
by a third party or is not damaged in any way. If the photoconductor
unit was refurbished by a third party or appears to be damaged, try
replacing it again before seeking service on the printer.
If the error persists, the printer may require service to correct
the issue. Contact Lexmark Technical Support for more information.
) and the back button (
).
) until you see Reset PC Cnt. Press 
or 
THANKS FOR SORTING ME OUT OF THE PROBLEM.THE FUSE IN THE PHOTOCONDUCTOR UNIT WAS DEFECTIVE.
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