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Try reseating the printhead. Remove the ink cartridges, lift up the lock lever and then pull the printhead out at an angle (IIRC). Then reinsert the printhead and lower the lever. Then reinsert the ink tanks one by one; Press down until you hear the click. Close the scanning unit and hit Set to print the alignment page. Tell the printer which line in each column has the best print quality (most solid); this is the horizontal alignment. Then repeat for the vertical alignment.
Try resetting the printer (on/off cycling). If this doesn't work, you may need a new printhead. Unfortunately, this may not solve the problem and you may need to have the unit serviced. Printheads are not returnable once you install them (so if replacing it doesn't help, you are stuck with the spare.)
Your print head may be damaged. You might consider replacing it.
Canon suggests pulling the ink wells and also pulling the print head and
then reinstalling the whole assembly. They consider this a reset. It is
also suggested to replace the printhead which the ink cartridges are
housed in. I have done this to remedy bad printing and am considering
this $50 purchase as I am dealing with "wrong cartridge" message also.
Some have said replacing the printhead remedied this code problem. BUT, i
did read one person who said this did NOT work. Right now I am debating
whether I should put $50 dollars more into this machine....although
this printer has been excellent and many agree.
Apr 17, 2010 - As a
follow up I did fix my "Wrong Cartridge" message by replacing the
printhead, I worked and worked at cleaning the old one but finally gave
in and anted up the $50. This fixed it! Long live DIYers!
I dont know why Cannon persist wuth there stupid messages by morse code,
E 7 means that a sensor has detected an incorrect ink cartridge
Options to fix
1.Check the ink cartridges are correctly installed
2. If you have recently replaced an ink cartridge with one from a supplier other than Cannon feplace the cartridge with a Cannon branded prosduct
3. If everything looks ok then try powering down the printer, unplug wait 2 minutes for all residual power to drain, then power up to see if the printer has resolved the problem, this just resets the sensor which reports the error but it often works as the sensors are the most likely part to give intermitten faults