Lexmark MX517
Extremely low print coverage for extended periods of time may cause imaging unit parts to fail prior to exhaustion of toner from toner cartridge.
For more information on replacing the imaging unit, see the instruction sheet that came with the supply.
Imaging unit
500Z
500ZA
Understanding imaging unit yield on Lexmark's MS/MX 310, 410, 510, 61x, 71x, and 81x devices.
31.6x Error Code Reinstall Missing or Unresponsive Imaging Unit (IU)