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Issue
Cause and solution
Print Head nozzles are clogged
See "Printing the Nozzle Check Pattern" and perform any necessary maintenance operation.
Clean the Print Head if lines are missing or if white streaks appear in the printed nozzle check pattern. Cleaning unclogs the nozzles and restores the print head condition. Note that cleaning the Print Head causes used ink to be absorbed in the ink absorber. Cleaning the Print Head consumes ink, so perform Print Head Cleaning only when necessary.
Caution
Make sure that the Inner Cover is closed.
1. Make sure that the machine is turned on, then load a sheet of A4 or Letter-sized plain paper in the Rear Tray or Cassette.
2. Open the Paper Output Tray, and then open the Output Tray Extension.
(1)Put your finger in the rounded indent of the Paper Output Tray and open it gently.(2)Open the Output Tray Extension.
3. Press the Paper Feed Switch to select the paper source where you have loaded paper.
4. Start Print Head Cleaning.
(1)Press the HOME button.The HOME screen is displayed.
(2)Select Settings 
(3)Select Maintenance, then press the OK button. The Maintenance screen is displayed.
(4)Select Cleaning, then press the OK button.
The confirmation screen is displayed.
(5)Select Yes, then press the OK button.Print Head Cleaning starts.Do not perform any other operations until Print Head Cleaning finishes. This takes about 1 minute.The pattern print confirmation screen is displayed.
(6)Select Yes, then press the OK button.The nozzle check pattern is printed.
5. Check the print head condition with the printed nozzle check pattern, and take appropriate action. See "Printing the Nozzle Check Pattern".
If print quality does not improve by standard Print Head Cleaning, try Print Head Deep Cleaning, which is a more powerful process. Note that cleaning the Print Head causes used ink to be absorbed in the ink absorber. Print Head Deep Cleaning consumes more ink than standard Print Head Cleaning, so perform this procedure only when necessary.
Caution
Make sure that the Inner Cover is closed.
1. Make sure that the machine is turned on, then load a sheet of A4 or Letter-sized plain paper in the Rear Tray or Cassette.
2. Open the Paper Output Tray, and then open the Output Tray Extension.
(1) Put your finger in the rounded indent of the Paper Output Tray and open it gently.
(2) Open the Output Tray Extension.
3. Press the Paper Feed Switch to select the paper source where you have loaded paper.
4 Start Print Head Deep Cleaning.
(1) Press the HOME button.
The HOME screen is displayed.
(2) Select Settings 
The Settings screen is displayed.
(3) Select Maintenance, then press the OK button.
The Maintenance screen is displayed.
(4) Select Deep cleaning, then press the OK button.
The confirmation screen is displayed.
(5) Select Yes, then press the OK button.
Print Head Deep Cleaning starts.
Do not perform any other operations until Print Head Deep Cleaning finishes. This takes about 1 minute 30 seconds.
5 Check the condition of the Print Head.
(1) Print the nozzle check pattern to check the print head condition.
See "Printing the Nozzle Check Pattern".
If a particular color is not printed properly, replace the ink tank of that color.
See "Replacing Ink Tanks".
(2) If the problem is not resolved, turn off the machine and perform Print Head Deep
Cleaning after 24 hours.
(3) If this does not solve the problem, the Print Head may be damaged. Contact your Canon Service representative.
When ink tanks run out of ink, replace them using the following steps.
Caution
1. Open the Paper Output Tray.
(1)Put your finger in the rounded indent of the Paper Output Tray and open it gently.
2. Make sure that the machine is turned on, and lift the Scanning Unit (Printer Cover) until it stops.
The Print Head Holder moves to the center.
Caution
Caution
If the Scanning Unit (Printer Cover) is left open for more than 10 minutes, the Print Head Holder moves to the right side. Close and reopen the Scanning Unit (Printer Cover) to return the holder to the center.
3. Open the Inner Cover.
Caution
Do not touch the metallic parts inside the machine.
4. Remove the ink tank whose lamp is flashing fast.
(1)Push the tab and remove the ink tank.
(A) Do NOT touch the Print Head Lock Lever; remove only the ink tank.
Caution
Caution
5. Prepare the replacement tank.
(1) Remove the new ink tank from its packaging, then pull the orange tape in the direction of the arrow (B) so that the protective film does not remain on the air hole (C).
Then remove the film completely (D).
Caution
Make sure that all the orange tape has been peeled off along the perforation. If part of the orange tape is remaining, ink may leak out when you remove the protective cap and may not eject properly when printing.
(2) Remove the orange protective cap from the bottom of the ink tank.
Discard the cap once it is removed.
(E) Carefully hold the protective cap when removing it to prevent the ink from staining your fingers.
Caution
6. Install the ink tank.
(1) Insert the front end of the ink tank into the Print Head.
(G) Make sure the position of the tank matches the label.
(2) Press on the 
(3) Make sure that the ink lamp lights up red.
Caution
The machine cannot be used unless all the ink tanks are installed.
7. Close the Inner Cover.
Caution
Make sure that the Inner Cover is closed. Printing will not start with the Inner Cover open since paper cannot be fed properly.
8. Gently close the Scanning Unit (Printer Cover).
Caution
Caution