5974 Close the front cover and then the side cover by pressing theround projections near the side cover open button. Theindicator will go out and the start ( ) indicator will light up.DRUM CARTRIDGE REPLACEMENTThe useful life of the drum cartridge is approximately 18,000 copies. When the internalcounter reaches approximately 17,000 copies, the drum replacement required ( )indicator will light up indicating that replacement of the drum cartridge will be neededsoon. For more information on purchasing the drum cartridge, see "ABOUT SUPPLIESAND INTERFACE CABLES" (p.71). When the indicator begins to blink, the unit will stopoperating until the cartridge is replaced. Replace the drum cartridge at this time.1 Remove the TD cartridge (see "TD CARTRIDGE REPLACEMENT" (p.58).2 Hold the drum cartridge handle andgently pull the cartridge out. Disposeof the old drum cartridge inaccordance with local regulations.3 Remove the new drum cartridge from the protective bag andremove the protective cover from the cartridge. Then gentlyinstall the new drum cartridge.When closing the covers, be sure to close the front cover securely andthen close the side cover. If the covers are closed in the wrong order, thecovers may be damaged.Do not remove the protective cover on the drum portion (black paper) ofa new drum cartridge before use. The cover protects the drum againstexternal light.• Do not touch the surface of the drum (green portion) of thecartridge. Doing so may cause smudges on the copies.Drum cartridge handle