After you open the cover and the carriage comes to the center for new ink, you press the resume button for a few seconds and the carriage will go to the printhead changing position. You don't want to ever force the printhead to move. Hope you didn't break something already. Sorry for the stupid help.
Open the blue inside cover with power on, as though you will change the cartridges, then force the carriage ever so slightly right, so in the near left corner you see a grey plastic tab, push that and allow the small frame to lift up, when its clear of the body you can let go of the carriage and then lift the head out - with or without the cartridges in, WARNING!, make sure you reseat the frame properly before the blue cover goes back down or it will foul as the carriage retreats back to its cleaning station
SOURCE: Figuring how to install new print head in my Canon iP90 printer
when you open the top cover, the carriage unit will mvoe to the middle
of the unit. Once it is there hold the inks and move a bit to the left
so you can see a grey lever. then the printhead and the inks will come
up together. remove inks and replace head.
This should work for you
SOURCE: Figuring how to install new print head in my Canon iP90 printer
The important point is moving the head to the left, or sliding it left or right, so you can actually SEE the LEVER. It is hidden otherwise and what appears to be the obvious lever on the top is the wrong lever. If you have pressed the correct lever the unit removes very easily. If it is hard and you cannot make progress chances are you have not found the correct LEVER!
SOURCE: Canon Pixma iP90 - Jagged text and lines
The printer has a plastic band that runs from one side to the other. The print head has a sensor that passes over it each time it moves. The band is a little transparent and appears to have vertical lines in it. That needs to be cleaned.
Hope this helps.
SOURCE: Canon iP90 error 5C00
5C00 is a purge unit error, thats the cleaning unit on the right where the printhead parks. Look inside with a flashlight, if nothing is blocking it's operation, you willl need a new print engine, qm2-2020-000 around $150.00
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