Canon DR-5010C - Manual (Page 67)

Regular Maintenance 65
Cleaning the Shading Boards
The shading boards are the white standard boards located behind the platen
rollers. A dirty shading board may alter scanned colors or cause marks on the
images.
1.
Turn ON the power.
2.
Hold the Upper unit as shown in the diagram, and open it slowly until it stops.
CAUTION
The pickup roller is located in the middle of the Upper unit. Do not
hold the protrusion on the Upper unit when you open it. Doing so
may deform the pickup roller or cause a feeding error.
IMPORTANT
Be sure to open the Upper unit until it stops. If it is not opened all the way, the
shading boards cannot come out.
3.
Press the Start Button for about two seconds.
The shading boards come out above the platen rollers (upper and lower).
Shading Boards