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Re: Black print is skipping
The carriage cable connecting the print head to the engine board is probably at fault. Make sure it is properly connected at both ends. Also make sure the contacts connecting the printhead to the carriage are in place, clean, and not damaged.
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Fuser hot belt has wear lines transfering to the page
Black pcu needs to be replaced
Transfer unit is not being cleaned properly and needs to be replaced.
Remove each of these assy and inspect them for wear or lines that corespond to the lines on your prints.
This sounds as if you have some ink/contamination on the small scaning glass that sits to either the left or right of the main glass on the copier.(Depending on the model/make)As your original is scanned over this thin piece of glass the scanning device will see any spots and this will result in a black line down the page.Please clean the glass with a soft rag.
The little cartridges are pigment for photo printing. The Large black cart is ink for plain paper (usually text) printing. If you select a photo paper in the print setup menu, you will use very little of the ink. To check the function of the large cart print out a test sheet from the printer maintenance menu. You may need to run a head cleaning to get all the nozzles to work.
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.