If there is a problem with the quality of the printing such as dirty or faint and patchy prints, first check the condition of the printer.
Check the following:
Does the envelope selector setting match?
Set the envelope selector according to the type of paper. For envelopes, set the lever to the rear position ; for everything else, set the lever to the forward position
. See Printing on Various Paper Types.
Has the printer not been used for a long time?
The ink may be dry or the nozzles of the print-heads may be clogged. Print the nozzle check test pattern and clean the print-heads as necessary. See Nozzle Check and Clean Print-heads (Normal).
Has the nozzle check test pattern been printed?
Print the nozzle check test pattern and check whether the print-heads are clogged. Clean the print-heads as necessary. See Nozzle Check and Clean Print-heads (Normal).
Have the print-heads been aligned?
If the image is fuzzy or lines are doubled, align the print-heads. If the problem persists, print the nozzle check test pattern and clean the print-heads as necessary. See Adjust Print-head Positions, Nozzle Check, and Clean Print-heads (Normal).
Is there a problem with the printer's location?
Make sure that the printer is level. Place the printer in a location where it will not be subject to shaking or excessive force.