62 Appendices2. Removing and Attaching the RollersFollow the relevant procedure to remove and attach the feed roller and retardroller when you clean or replace them.IMPORTANTFeed rollers are consumable parts. When the rollers start to wear out, paperjams and misfeeds may occur more often. When this happens, buy an exchangeroller kit, and replace the feed roller and the retard roller.CAUTIONDo not use excessive force when removing or attaching therollers. Doing so may damage them.Roller Replacement CycleWhen the number of pages scanned exceeds 30,000, a roller replacementmessage will appear when the computer is started. When you are using theDR-2050SP in the Presentation mode, a message prompting you to change therollers is displayed after the opening screen when the scanner’s power is turnedON. Buy an exchange roller kit, and replace the feed roller and the retardroller.IMPORTANT• If misfeeds happen often, check the rollers for wear, and replace them ifnecessary before the message is displayed.• Be sure to reset the counter after replacing the rollers. (See “Resetting theCounter,” on p. 63.)• Contact your local authorized Canon dealer or service representative forinformation about the exchange roller kit (feed roller and retard roller).When using the DR-2050SP in Presentation mode