8.2 < Maintenance>4 Locate the long strip of glass (LSU) inside the top of the cartridgecompartment, and gently swab the glass with a cotton swabchecking to see if dirt turns the cotton black.5 Reinsert the toner cartridge and close the front cover.6 Plug in the power cord and turn the printer on.Printing a cleaning sheetIf you are experiencing blurred, faded, or smeared printouts, you canclear the problem by printing a cleaning sheet, provided by your printer.You can print:• OPC Cleaning sheet: cleans the OPC drum of the toner cartridge.• Fuser Cleaning sheet: cleans the fuser unit inside the printer.This process will produce a page with toner debris, which should bediscarded.1 Make sure that the printer is turned on with paper loaded in the tray.2 Press Menu until System Setup appears on the bottom line of thedisplay and press OK.3 Press the scroll buttons until Maintenance appears and press OK.4 When Clean Drum appears, press OK.Or, press the scroll buttons until Clean Drum or Clean Fuserappears and press OK.Your printer automatically picks up a sheet of paper from the trayand prints out a cleaning sheet with dust or toner particles on it.Maintaining the toner cartridgeToner cartridge storageTo get the most from the toner cartridge, keep the following guidelinesin mind:• Do not remove the toner cartridge from its package until ready for use.• Do not refill the toner cartridge. The printer warranty does not coverdamage caused by using a refilled cartridge.• Store toner cartridge in the same environment as the printer.• To prevent damage to the toner cartridge, do not expose it to light formore than a few minute.Expected cartridge lifeThe life of the toner cartridge depends on the amount of toner that printjobs require. When printing text at 5% coverage, the toner cartridgelasts an average of either 10,000 or 4,000 pages. (The original tonercartridge supplied with the printer lasts an average of 4,000 pages;however, it varies depending on the product configuration.) The actualnumber may also be different depending on the print density of thepages you print on, and the number of pages may be affected byoperating environment, printing interval, media type, and media size. Ifyou print a lot of graphics, you may need to change the cartridge moreoften.Your machine sets the toner remains in 3 levels, Toner Low, ReplaceToner, and Toner Exhausted. The machine is designed to detect thetoner remains and stop printing when the level is Toner Exhausted, forpreventing your machine from severe contamination or malfunction.Refer to page 7.1 for supplies information.Saving TonerTo save toner, press Toner Save on the control panel. The buttonbacklight turns on.Using this feature extends the life of the toner cartridge and reduceyour cost per page, but it also reduces print quality.Checking the remaining tonerYou can check the level of toner left in the cartridge.If you are having print quality problems, this can help you determine ifthe problem is caused by low toner.1 Press Menu until System Setup appears on the bottom line of thedisplay press OK.2 Press the scroll buttons until Maintenance appears and press OK.3 Press the scroll buttons until Supplies Life appears and press OK.4 Press the scroll buttons to access Toner Remains and press OK.The display shows the percentage of the remaining toner.NoteWhile the following messages are appearing on the display, thesub-menu(s) under Supplies Life can be changed:- Invalid Toner, NonGenuine Toner, Replace Toner,Toner Exhausted