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Blue dots on right side

LaserJet Pro MFP M477 fdw

I‘m experiencing blue dots on the right side of every page printed about an inch apart top  to bottom, how can I get rid of that?

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Blue dots on right side

Defective roller inside cyan toner cartridge leaves that dot. 



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Blue dots on right side

Check for something stuck to the drum of the cyan cartridge. Remove the cartridge and look at the blue/green cylinder on the bottom. You may see something on it or it might be a damaged drum. Probably you will need to replace the cyan cartridge to get rid of the defect.

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