Canon mp620 - Manual (Page 606)

If there is no sign of improvement after Deep Cleaning, switch off the machine, wait 24 hours, and
then perform Deep Cleaning again. If there is still no sign of improvement, the ink may have run out
or the print head may be worn. For details on the remedial action to be taken, see "
Machine Moves
But Ink Is Not Ejected ."
Related Topic
Checking the Print Head Nozzles
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Page 606 of 815 pages Cleaning the Print Heads