Canon imagePRESS C1+ Reference Manual page 566

Place the original on the platen glass.
Cause
Remedy
Remove the original from the platen glass.
Cause
Remedy
Remove the original from the feeder.
Cause
Remedy
The platen glass is dirty.
Cause
Remedy
Adjusting gradation. Please wait a moment.
Cause
8
Remedy
8-72
List of Error Messages
The specified mode requires that the original be placed on the platen glass, but there is no
original on the platen glass.
Place the original on the platen glass.
An original remains on the platen glass.
Remove the original from the platen glass, and place the new original.
The machine cannot scan your original using the feeder. An original is placed both in the
feeder and on the platen glass.
Remove the original from the feeder.
The feeder scanning area is dirty.
Clean the feeder scanning area. (See "Platen Glass and Original Feeding Belt/Underside of
the Feeder," on p. 7-53.)
The machine is performing an automatic gradation adjustment.
Wait for the machine to finish the automatic gradation adjustment. When the adjustment is
complete, printing automatically resumes.