Rollers and their covers, and the document holding guide are consumable parts. When the total number of pagers scanned with the rollers reaches 100,000 pages, an Exchange Roller Kit will need to be purchased (and installed).
When the rollers start to wear out, problems such as paper jams and improper document feeding become more likely to occur. If this happens, replace the rollers regardless of the page count.
Make sure to reset the roller count after replacing the rollers.