Canon imageRUNNER C5051 ADVANCE Maintenance Manual page 139

Yellow toner is low. Replacement not yet needed.
Cause Toner of the displayed colour is running low.
Remedy Prepare the displayed colour's toner cartridge for replacement. (See "Replacing the Toner Cartridge, " on p. 1-38.)
Replace toner cartridge. (Black)
Cause 1 Printing will soon not be possible because the toner of the displayed colour is running out.
Cause 2 Printing is not possible because toner of the displayed colour has run out.
Remedy Replace the displayed colour's toner cartridge. (See "Replacing the Toner Cartridge, " on p. 1-38.)
Replace toner cartridge. (Black copying is possible.)
Cause Colour copying is not possible because toner of the displayed colour has run out.
Remedy Replace the displayed colour's toner cartridge. (See "Replacing the Toner Cartridge, " on p. 1-38.)
Replace toner cartridge. (Black printing is possible.)
Cause Colour printing from the Mail Box and Fax/I-Fax Inbox is not possible because toner of the displayed colour has run out.
Remedy Replace the displayed colour's toner cartridge. (See "Replacing the Toner Cartridge, " on p. 1-38.)
Insert toner cartridge. (Cyan)
Cause The toner cartridge of the displayed colour is not inserted properly.
Remedy Make sure that the toner cartridge is inserted properly. (See "Replacing the Toner Cartridge, " on p. 1-38.)
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List of Error Messages
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