Canon imagePROGRAF GP-4000 - Manual (Page 377)

Checking for Nozzle Clogging
If printing is faint or affected by banding in different colors, make sure the print head nozzles are clear by
printing a test pattern to check the nozzles.
Note
• By default, nozzles are checked at fixed intervals. •
Auto maintenance settings
Paper to Prepare
When using rolls
An unused roll at least 10.00 in. (254.0 mm) wide
When using sheets
One sheet of unused paper of at least A4/Letter size
1. Load paper. 1.
Loading the Upper Roll on the Printer
Loading the Lower Roll on the Roll Unit (Option)
Loading Sheets in the Printer
2. Tap Maintenance on HOME screen. 2.
Home Screen Menu Composition
The Maintenance screen appears.
3. Tap Nozzle Check . 3.
A confirmation message appears.
4. Tap Yes . 4.
The printer now prints a test pattern for checking the nozzles.
5. Check the printing results. 5.
If the horizontal lines are not faint or incomplete, the nozzles are clear.
If some sections of the horizontal lines are faint or incomplete, the nozzles for those colors are clogged.
If horizontal lines are faint or incomplete, execute print head cleaning.
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