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Dear sir arthur, Paper feed problem is usually caused by broken sheet feeder unit. But if you can print nozzle check pattern successfully it seems that paper cam sensor broken so it cannot reach paper end properly.Rarely, faulty paper feed sensor may cause the same problem. Regards,
According to a service manual for a similar Canon printer, the grayscale printing should only use the Pigment Black ink PGI-5BK.
On fast it is 300x300dpi with 1 pass, standard is 600x600dpi with 1 pass and high is 600x600 with 4 passes.
On plain paper in colour it is meant to still only use the C/M/Y and again the big pigment black ink PGI-5BK, it only uses the smaller black ink once you set it to use a photo type paper in the printing settings.
If streaking is occurring only at the bottom of the page (i.e. the last area to print as the paper is fed beneath the print head), the problem may be due to improper curl of the paper. Many inkjet printers (Canon especially), rely on a slight curl of the paper so that it is "bowed" when it travels beneath the print head.
To see if this is the problem, gently roll a sheet of paper so that the print side is on the outside of the roll. When you place the paper in the feed area, it should have a very slight bow so that the center of the print side is slightly raised off the surface, while the edges are on the surface.
Also, make sure you use only OEM (Canon) cartridges. There is not a single "compatible" cartridge in the world that won't screw up your Canon print head. Take my word for it (and I DON'T work for Canon), you must use only Canon cartridges.