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.
OK. The machine will print the drum dot check sheet.
b. Open the
front cover and remove the drum and toner assembly.
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.
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
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
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
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 ï¿½ 75% strength alcohol is also
acceptable). Allow the alcohol to evaporate or dry off the surface before
Be sure to look
over the entire drum as there may be several areas on a drum that need
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
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.
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
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.