Canon image formula dr-c125 ユーザーズマニュアル

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4
Click the [Maintenance] tab and then change the value of 
[Reduction ratio adjustment].
The adjustment value can be set within the range from -3.0% to 
3.0%.
5
Click [OK] to close the scanner properties.
Replacing Consumable Parts
The two rollers (feed roller and retard roller) installed in the scanner 
are consumable parts. The feed roller and retard roller wear with 
scanning. If the feed roller and retard roller are worn, documents may 
not feed correctly and paper jams or double-feed errors may occur.
When more than 100,000 pages have been fed (total number of pages 
fed by the scanner), a message prompting you to replace the rollers is 
displayed when the computer is started.
If this message begins to be displayed at startup, purchase an 
exchange roller kit and replace the worn parts with the consumable 
parts included in the kit (feed roller and retard roller). For details on the 
exchange roller kit, 
Furthermore, the counter in the scanner that records the number of 
pages fed also needs to be reset when you replace the rollers. 
Hint
Even before it becomes time to replace the rollers, scanned images 
may become stretched in the vertical direction due to wear of the 
rollers. If this happens, adjust the reduction ratio.