The lcd displays 80 scheduled maintenance at each 100k and 600k page count interval it is necessary to replace the appropriate maintenance kit at this interval to maintain the print quality and reliability of the print engine giving you the ability to control your documents and make sure that they always turn out to have a high standard finish the lexmark 40x4093 maintenance kit is a great addition to your printing accessories which youll find works perfectly the parts of the lexmark 40x40