Canon CLC5151 Reference Manual page 469

Remove the original from the feeder.
Cause The machine cannot scan your original using the feeder. An original is placed both in the
feeder and on the platen glass.
Remedy Remove the original from the feeder.
Original scanning area (thin glass strip) is dirty.
Cause The feeder scanning area is dirty.
Remedy Clean the feeder scanning area. (See "Manual Feeder Cleaning," on p. 7-43.)
Adjusting gradation. Please wait a moment.
Cause The machine is performing an automatic gradation adjustment.
Remedy Wait for the machine to finish the automatic gradation adjustment. When the adjustment is
complete, printing automatically resumes.
Preparing for color printing. Please wait.
Cause The machine is performing an automatic adjustment.
Remedy Please wait for a moment. Colour printing resumes automatically when the adjustment is
finished.
Cleaning the drum... Please wait a moment...
Cause The machine is in the process of cleaning the drum.
Remedy Wait for the machine to finish cleaning the drum. When cleaning is complete, printing
automatically resumes.
List of Error Messages
8
8-77