Canon MX520 series Online Manual page 85

If the problem is not resolved after cleaning the print
Step 3
Clean the print head deeply.
From the machine
Cleaning the Print Head Deeply
From the computer
Cleaning the Print Heads from Your
Computer
If the problem is not resolved, turn off the power and
clean the print head deeply again after 24 hours. Do
not disconnect the power plug when turning off the
If the problem is still not resolved:
Step 4
Replace a FINE cartridge.
Replacing a FINE Cartridge
Note
If the problem is still not resolved after replacing the FINE cartridge, contact the service center.
When the Print Results Are Not Even such as the Ruled Lines Are
Misaligned:
Align the print head.
From the machine
Aligning the Print Head
head twice:
power.