Canon MAXIFY GX5020 Wireless MegaTank Inkjet Color Printer - Manual (Page 94)

Examining the Nozzle Check Pattern
Examine the nozzle check pattern, and clean the print head if necessary.
Check if there are missing lines in the pattern A or horizontal streaks in the pattern B.
If there are missing lines in the pattern A:
C: Good
D: Bad (lines are missing)
If there are horizontal streaks in the pattern B:
E: Good
F: Bad (horizontal streaks are present)
If any color in the pattern A or the pattern B is not printed:
(Example: Magenta pattern is not printed)
If one of the above is applied, cleaning the print head is required.
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