Answer to your Frequently Asked Question:

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Description of Problem 100000028630

The printed pages have black smudges or dots. How can I improve the print quality?

Description of Solution 200000036708

1.  Print the Printer Settings Page by pressing the OK key 3 times 


-  If no dots appear, the issue is resolved.


-  If dots appear on the Printer Settings page, continue to the next step.


2.  Dots are typically caused by foreign material inside the machine (for example, paper dust, glue from labels or envelopes, paper clips, staples) sticking to or damaging the surface of the drum. Toner builds up on or sticks to these areas on the drum and creates black dots on the printed pages.


3.  Do the following to clean the drum unit.


a.  Print the Drum Dot Check Sheet:


i.  Press the Ok key 2 times.


ii.  Press the UP OR DOWN ARROW key to select Drum Dot Print.


iii.  Press OK.  The machine will print the drum dot check sheet.


b.  Open the front cover and remove the drum and toner assembly.



NOTE:  We recommend you put the drum unit and toner cartridge assembly on a clean, flat surface with a sheet of disposable paper or cloth underneath it in case you accidentally spill or scatter toner.


c.  Remove the toner cartridge from the drum by holding down the green lock lever on the right side of the drum unit and lifting the toner out.





NOTE: Handle the toner cartridge carefully. If toner scatters on hands or clothing, immediately wipe it off or wash it with cold water.


d.  Turn the drum unit over. Make sure the drum unit gear(1) is on the left hand side.



e.  Use the numbered markers next to the drum roller to locate where the mark will be on the surface of the drum as compared to the drum dot check sheet.



-  The drum is photosensitive so DO NOT touch it with your fingers.

-  DO NOT clean the surface of the photosensitive drum with a sharp object.

-  DO NOT use a scrubbing motion because this might damage the drum.



f.  Turn the drum unit gear toward you by hand while looking at the surface of the suspected area.



g.  When you find the mark on the drum surface that matches the drum dot check sheet, wipe the surface of the drum with a cotton swab moistened with isopropyl alcohol(91% strength alcohol is preferred, but 70 � 75% strength alcohol is also acceptable).  Allow the alcohol to evaporate or dry off the surface before continuing further. 


Be sure to look over the entire drum as there may be several areas on a drum that need cleaning.


As a precaution please note: Isopropyl alcohol is flammable and should be kept away from fire or flame.  As stated, this cleaning process typically has to be repeated several times to remove certain kinds of foreign material from the drum unit surface.



NOTE:  DO NOT clean the surface of the photosensitive drum with a sharp object.


h.  Turn the drum unit over. Clean the primary corona wire inside the drum unit by gently sliding the green tab located the top of the drum unit, from left to right several times. Return the green tab to the home position before reinstalling the drum unit assembly.





4. Reinstall the toner into the drum (be sure it clicks into place). If you put it in properly, the green lock lever will lift automatically. 





5.  Reinstall the drum and toner assembly into the machine and close the front cover, pressing firmly on each side until the cover clicks into place.





6.  Press the OK key 3 times to print the Printer Settings page.


-  If the dots no longer appear, the issue is resolved.


-  If the dots still appears, but has improved, repeat STEPS 3 - 6. Performing multiple cleanings has been very successful. 


7.  If the dots did not improve after repeating STEPS 3 - 6 at least 3 times, print 10 to 15 blank pages from the computer to further clean any remaining debris left on the drum surface.


8.  Print the Printer Settings Page again by pressing the OK key 3 times to confirm the issue is still occurring. 


-  If the print quality is good after cleanings, your issue is resolved.


-  If the issue is the same or the quality has improved, but the dots are still visible, and you manually cleaned the drum unit at least three times, the drum (DR720) will need to be replaced.






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