The printhead needs to be always clean to able to move freely. A paper trapped can hinder the movement of the printhead and a clogged printhead may result to prints that are too light, too spotty, or have horizontal lines. I always check and clean the print head.
I usually detect the ink cartridge and toner cartridge problem with a blinking or a non green indicator lamp. If the ink cartridge is empty, I changed the cartridge with an original one. I tried a refilled cartridge but it didn’t give my money’s worth. So if your printer is Canon, use new Canon Printer Ink Cartridges. The same applies with the other brands.
I am cleaning the printer twice a month. I don’t have a blower so I loosen first the dust and other particles with a soft brush then use the vacuum in cleaning it. If you have blower, the better.
This is for simple printer maintenance and paper jam problems only. For more complicated printer problems, have your printer checked by a repairman.