Canon MP640 - page 105

Note
Press the HOME button to exit the Settings menu and display the HOME screen.
For (B) (lines are missing or horizontal white streaks are present) in (1) or (2), or in both (1) and
(2):
(1) The cleaning is required. Select Also B and press the OK button.
The cleaning confirmation screen will appear.
(2) Select Yes and press the OK button.
The machine starts cleaning the Print Head.
See Cleaning the Print Head.
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Page 105 of 988 pagesExamining the Nozzle Check Pattern