Lexmark MS812dn / MS812dtn
Extremely low print coverage for extended periods of time may cause imaging unit parts to fail prior to exhaustion of toner.
For more information on replacing the imaging unit, see the instruction sheet that came with the supply.
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)