Canon imageRUNNER C5051 ADVANCE Maintenance Manual page 140

Prepare a new waste toner container and open the front cover.
Cause Printing is not possible because the waste toner container is full.
Remedy Replace the waste toner container. (See "Replacing the Waste Toner Container, " on p. 1-43.)
Place the original on the platen glass.
Cause The specified mode requires that the original be placed on the platen glass, but there is no original on the platen glass.
Remedy Place the original on the platen glass.
2
Remove the original from the platen glass.
Cause An original remains on the platen glass.
Remedy Remove the original from the platen glass, and place the new original.
Remove the original from the feeder.
Cause The machine cannot scan your original using the feeder. An original is placed 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's scanning area is dirty.
Remedy Clean the feeder's scanning area. (See "Manual Feeder Cleaning, " on p. 1-47.)
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.
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List of Error Messages