Canon CLC5151 Reference Manual page 468

Replace toner cartridge. (Black copying is possible.)
Cause
Remedy
Replace toner cartridge. (Black printing is possible.)
Cause
Remedy
Insert toner cartridge. (Cyan)
Cause
Remedy
Prepare a new waste toner container and open the front cover.
Cause
Remedy
Place the original on the platen glass.
8
Cause
Remedy
Remove the original from the platen glass.
Cause
Remedy
8-76
List of Error Messages
Colour copying is not possible because toner of the displayed colour has run out.
Replace the displayed colour's toner cartridge. (See "Replacing the Toner Cartridge," on
p. 7-32.)
Colour printing from the inbox is not possible because toner of the displayed colour has run
out.
Replace the displayed colour's toner cartridge. (See "Replacing the Toner Cartridge," on
p. 7-32.)
The toner cartridge of the displayed colour is not inserted properly.
Make sure that the toner cartridge is inserted properly. (See "Replacing the Toner Cartridge,"
on p. 7-32.)
Printing is not possible because the waste toner container is full.
Replace the waste toner container. (See "Replacing the Waste Toner Container," on p. 7-38.)
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.