Canon PIXMA MP560 - Manual (Page 103)

For (B) (lines are missing or horizontal white streaks are present) in (1) or (2), or in both (1) and
(2) :
(1) Select Also B and press the OK button.
Clean the Print Head. 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 103 of 949 pages Examining the Nozzle Check Pattern