8.2 <Maintenance>4 Locate the long strip of glass (LSU) inside the top of the cartridgecompartment, and gently swab the glass to see if dirt turns thewhite 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.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 ISO 19752 5% coverage, a new tonercartridge lasts an average of either 8,000 or 4,000 pages. (The originaltoner cartridge supplied with the printer lasts an average of 4,000pages.) The actual number may also be different depending on the printdensity of the pages you print on, and the number of pages may beaffected by operating environment, printing interval, media type, andmedia size. If you print a lot of graphics, you may need to change thecartridge more often.Saving TonerUsing this feature extends the life of the toner cartridge and reduceyour cost per page, but it also reduces print quality. “Using toner savemode” on page 2.7Checking 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