Canon PRO-300 Series Online Manual page 212

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For B (lines are missing or horizontal streaks are present) in the pattern C or pattern D, or in both

The cleaning is required. Select Also B, then select Yes on the cleaning confirmation screen.

Select an ink group containing missing lines or horizontal streaks to perform cleaning.

Cleaning the Print Head

• Because CO ink is colorless, its pattern is printed over the black pattern. Check for horizontal

streaks (E) in the dark gray bands of the pattern.

If the pattern D or any color in the pattern C is not printed:

The cleaning is required. Select Also B, then select Yes on the cleaning confirmation screen.

Select an ink group that is not printed to perform cleaning.

Cleaning the Print Head

(Example: Magenta pattern is not printed)