Canon imagePROGRAF PRO-300 13" Photographic Inkjet Printer - Manual (Page 253)

Examining the Nozzle Check Pattern
Examine the nozzle check pattern, and clean the print head if necessary.
1. Check if there are missing lines in the pattern C or horizontal streaks in the pattern D.
A: No missing lines/No horizontal streaks
B: Lines are missing/Horizontal streaks are present
2. Select the pattern that is closer to the printed nozzle check pattern on the confirmation
screen.
For A (no missing lines or no horizontal streaks) in both the pattern C and pattern D:
The cleaning is not required. Select All A , confirm the message, then select OK .
The screen will return to the Maintenance screen.
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