This Lexmark Maintenance Kit is designed for specific Lexmark MS series printers, including the MS 810, MS 811, and MS 812 models. It is essential for maintaining optimal print quality and reliability. The kit replaces key components such as the fuser, transfer roller, pick roller, and separation roller. When the operator panel displays a "Replace maintenance kit" message or error codes such as 80.0x, 80.1x, 80.2x, or 80.3x, it indicates that the maintenance kit needs to be installed. Error code 80.3x signifies that the fuser has reached its rated life and the printer will stop until a new maintenance kit is installed. Ensure you use the correct Fuser Maintenance Kit for your printer's fuser type. Compatible Printer Models: Lexmark MS 810 n, Lexmark MS 810 dtn, Lexmark MS 810 de, Lexmark MS 810 dn, Lexmark MS 811 n, Lexmark MS 811 dtn, Lexmark MS 811 dn, Lexmark MS 812 n, Lexmark MS 812 dtn, Lexmark MS 812 de, Lexmark MS 812 dn.