The feed rollers and separation pad inside the scanner are consumable parts and will wear with scanning. If either the feed roller or the separation pad or are worn, documents may not feed correctly and paper jams may occur.
When the total number of pages of documents fed in the scanner exceeds the following quantity, a message appears when the scanner is connected to the computer. In such cases, you must replace the part indicated in the message.

Feed Roller: 100,000 sheets
 

Separation Pad: 10,000 sheets
 

Furthermore, the counter in the scanner that records the number of pages fed also needs to be reset when you replace the rollers.

Replacing the Feed Roller

Replacing the Separation Pad

Resetting the Counters