Canon PRO-10 Series Manual page 743

Check 1: Did you confirm the paper and print quality settings?
Print Results Not Satisfactory
Check 2: Check the status of ink tanks. Replace the ink tank if the ink
has run out.
Replacing an Ink Tank
Check 3: Print the Nozzle Check Pattern and perform any necessary
maintenance operations such as Print Head Cleaning.
Print the Nozzle Check Pattern to determine whether the ink ejects properly from the print head
nozzles.
Refer to When Printing Becomes Faint or Colors Are Incorrect
Print Head Cleaning, and Print Head Deep Cleaning.
If the Nozzle Check Pattern is not printed correctly:
Check to see if a particular color's ink tank is not empty.
If the Nozzle Check Pattern is not printed correctly though ink is sufficient, perform the Print Head
Cleaning and try printing the Nozzle Check Pattern again.
If the problem is not resolved after performing the Print Head Cleaning twice:
Perform the Print Head Deep Cleaning.
If the problem is not resolved after performing the Print Head Deep Cleaning, turn off the printer
and perform another Print Head Deep Cleaning after 24 hours.
If the problem is not resolved after performing the Print Head Deep Cleaning twice:
If Print Head Deep Cleaning does not resolve the problem, the print head may be damaged.
Contact the service center.
Check 4: When using paper with one printable surface, make sure that
the paper is loaded with the printable side facing up/down.
Load paper with the printable side facing up.
Refer to the instruction manual supplied with the paper for detailed information on the printable side.
Check 5: Is automatic ink quality maintenance enabled?
If automatic ink quality maintenance is disabled, ink in one or more ink tanks may separate, resulting in
uneven density. Enable automatic ink quality maintenance by using the printer driver.
1.
Make sure that the printer is turned on.
2.
Open the Canon IJ Printer Utility.
Opening the Canon IJ Printer Utility
for the Nozzle Check Pattern printing,