When my 7780 prints a black page, a whole line of 3 inches is faded while the rest lines

My 7780 print a faded line each line of the 4th or 5th but all other lines are thin and dark. I cleaned all the internal parts

with a cleaning kit and everthing works fine except for the faded line. What it could be?

Take a look at this document to a print quality that it can offer help:

http://support.HP.com/us-en/document/c01957673

Tags: HP Printers

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