Manual replacing the print cartridges --> try rotating the left white gear back and forward releasing the mechanical lock of the print head it is a small plastic peace in the back of the of the head ...replace the cartridge as you need ...
about the error p03 it indicates a mechanical jam (head carriage - paper jem - paper pickup mechanizm - head cleaning mechanizm ) also clean carfully all sensors from inside ... it can give you a mechanical jam if blocked
Solutions to troubleshoot Canon printer error P03
Solution 1: try out this solution
Verify whether the paper tray is accurately placed or not. If it is the case where any type of object is placed in front of the machine then just remove it.
Solution 2: if you are not satisfy with the above solution then, try this out
Search for various small pieces of paper that are there inside in the Canon printer. Also do check whether there is any object inside.
Solution 3: This is the third solution which users can also try
Power off the printer first and then wait at-least for 30 seconds. Power on the device again. Check for the issue if it exists further or not.
Solution 4: Check for all your faulty parts
These issues can also take place if there are any kind of faulty printer parts, below are few lists of them
https://www.canonprintersupport247.com/blog/how-to-fix-canon-printer-error-p03
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