Lexmark 66S0Z00 Black Return Program Imaging Unit is a replacement imaging component for supported monochrome laser printers. It serves the printer’s image-forming system and is intended for black-and-white laser printing.
The unit has a stated yield of up to 75,000 pages. Actual yield can vary with printing conditions; the figure is an estimate rather than a guaranteed page count. Its return-program designation means the used unit can be sent back to Lexmark for remanufacturing and recycling.
Lexmark lists the MS531dw, MS631dw, MS632dwe, MX532adwe and MX632adwe printers as compatible. This identifies the supported models while keeping the unit’s role clear: an imaging component for those monochrome laser printers.