Canon imagePROGRAF iPF6400SE User Manual page 591

iPF6400SE When to Replace the Maintenance Cartridge
Check the remaining Maintenance Cartridge capacity before this maintenance and replace the Maintenance Cartridge
if necessary.
If a message for the Maintenance Cartridge replacement is shown on the Display Screen
When the Maintenance Cartridge is almost empty, the Message Lamp lights, a message to replace the Maintenance
Cartridge is displayed on the Display Screen, and you cannot print. Replace the Maintenance Cartridge with a new
one.
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User's Guide