Canon MP560 - PIXMA Color Inkjet, Service Manual, Page: 60 / 67

4-4. Special Notes on Servicing
(1) Print head problem (smeared printing, uneven printing, non-ejection of ink, etc.)
For problems that are supposed to be caused by the print head (smeared printing, uneven printing, or non-
ejection of ink, etc.), print the nozzle check pattern to determine whether the print head is faulty or not.
< Procedures >
0) Using the tool print head, confirm that the test printer (to be used to examine the print head in question)
operates properly, then install the print head in question in that test printer.
1) Print the nozzle check pattern (in the user mode or in the service mode).
2) If there is a missing portion in the printed pattern, perform the print head cleaning (2 times at the
maximum), and print the nozzle check pattern again.
3) If the problem persists even after the print head cleaning is performed 2 times, perform the print head
deep cleaning, then print the nozzle check pattern again.
4) If the problem is still not resolved, i) turn off the machine and leave it for 24 hours or longer, ii) perform
the print head cleaning, and iii) print the nozzle check pattern again.
5) If the problem still persists after steps 1) to 4), the print head may be faulty. Replace the print head.
(2) Paper feed motor adjustment
1) When attaching the motor, fasten the screws so that the belt is properly stretched (in the direction
indicated by the blue arrow in the photo below).
2) After replacement, be sure to perform the service test print, and confirm that no strange noise or faulty
print operation (due to dislocation of the belt or gear, or out-of-phase motor, etc.) occurs.
The screws securing the paper feed motor may be loosened only at replacement of the
paper feed motor unit. DO NOT loosen them in other cases.
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