12 Maintenance198 Xerox Phaser 3635MFP User GuideConsumablesConsumables are items on the machine that need replenishing or replacing,such as paper, staples and customer replaceable units. To place an order forXerox consumables, please contact your local Xerox Representative givingyour company name, product number and the machine serial number.NOTE: For information about locating the serial number, please refer toCustomer Support on page 5.CAUTION: When replacing consumables, DO NOT remove the covers orguards that are fastened with screws. You cannot maintain or serviceany of the parts that are behind these covers and guards. DO NOTattempt any maintenance procedure that is NOT specifically describedin the documentation supplied with your machine.Customer Replaceable UnitsThe Print Cartridge and Staple Cartridge are Customer Replaceable Units(CRUs) on the machine.The machine will display a message on the touch screen when it needs to bereordered. This message is a warning that the unit is nearing the end of its life.Only replace the unit when a message actually instructs you to do so.To replace a CRU, follow the instructions on the User Interface or refer to therelevant sections below.CAUTION: When replacing consumables, DO NOT remove the covers orguards that are fastened with screws. You cannot maintain or serviceany of the parts that are behind these covers and guards. DO NOTattempt any maintenance procedure unless specifically described in thedocumentation supplied with your machine.Print CartridgeThis procedure shows you how to remove a used Print Cartridge and replaceit with a new Print Cartridge.New Print Cartridges have a capacity of approximately 20,000 images with anaverage area coverage of 5%. The machine will indicate the percentage oftoner used and the number of days remaining. When the notification messageis enabled, the machine will tell you when you will need to order a newcartridge and when to fit it. For information on setting the notification message,please refer to Print Cartridge Reorder Notification in the Setups chapter onpage 185.If the feature is enabled, a message will appear on the display screen advisingyou to replace the Print Cartridge. If you want to replace the Print Cartridge