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Check out our Black or Color Ink Not Printing, Other Print Quality Issues info about: Print quality and Cartridge Issues.
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CP1215 HP Colour LaserJet. Has dots over printing, horizontal lines and vertical lines. I tried cleaning the drum with isopropyl and re-printed and the page that I received was the last photo. Looking for a cost effective way to fix this. 

 

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Samples are not visible, but typically repetitive dots or lines across page are cartridge related. If the dots are a single color, remove the cartridge that matches the defect color and check the blue/green drum on the bottom for any defects. 

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