Lexmark MX711
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.
Imaging unit
520Z
520ZA
Understanding imaging unit yield on Lexmark's MS/MX 310, 410, 510, 61x, 71x, and 81x devices.
Lexmark MS81x, MS71x, MX81x, and MX71x ? Repeating Print Quality Defects Due to Early Imaging Unit Failure