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Hello there,  I am trying to print a document related to the office, I am facing an issue with black color printing documents, as the paper printed with shades and lines shown in the image below.  other color documents are printing fine only black is...

 Hi I am using canon mf642c/643c/644c printer at my office, as i print any document I am getting some black shade on the A4 sheet as you can see in the above picture.i tried cleaning the fixed assembly ITB from the machine but the results are same, a...