Canon imagePROGRAF iPF750 MFP M40 - Manual (Page 845)

Maintenance cartridge problem.
Cause Corrective Action
An incompatible or used Maintenance
Cartridge has been installed. Install an unused Maintenance Cartridge specified for use with the printer.
(See "Replacing the Maintenance Cartridge.")
→P.749
Error Message > Messages regarding the maintenance cartridge >
iPF750 Maintenance cartridge problem.
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