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Repeating dots are usually the result of foreign material on the drum charge roller or toner adhesion (like a little smashed melted blob) on the developer cylinder. You can clean the charge roller with water. To clean the dev cylinder, wipe the toner off the area, then use strong alcohol to clean any area with the little "blob" buildup. Rotate cylinder and repeat for any remaining. You can usually see the area before you wipe it by looking for a darker spot on the dev cylinder than the rest of the coverage area. Copies will look bad at first after cleaning either. Just run about 20 or so copies.
Try to print clean page , Print a cleaning page
During the printing process, paper, toner,
and dust particles can accumulate inside the printer and can cause print
quality issues such as toner specks or spatter, smears, streaks, lines
or repeating marks.
Follow these steps to clean the printer's paper path.
Load copier-grade paper (not bond, heavy, or rough paper).
On the printer's control panel, touch the Menu
Touch Configure Device
Touch Print Quality
Touch Process Cleaning Page
message appears on the printer control panel display while the cleaning
is taking place. The cleaning process takes a few minutes to complete.
Do not turn the printer off until the cleaning process has finished.
A page will be printed when the task is complete. Discard the page.
You might need to repeat the cleaning
process to thoroughly clean the printer. Print a few more pages to see
if the problem is resolved.
Three or four repeating marks down the page means there will be a spot or smudge of toner on drum unit. Open the front hatch and remover the toner and drum assembly. Separate the toner and drum. Rotate the drum cylinder using the white gear at one end looking carefully at the surface of the cylinder as you turn it. Somewhere on the surface you will see one or more black specks. These need to be cleaned off using alcohol (preferably Iso-propanol but methylated spirit will do)on a cotton ball (or very soft cloth or tissue paper). Once you have found and cleaned off all specks you can re-assemble the toner and drum, put it back in the printer and run a test page. That should fix your problem.
Sounds like your imaging drum, transfer rollers, or transfer belt could be contaminated. Using canned air, I'd try and blow out any sort of toner residue on these parts. They can often show up as dots or splotches when found on said parts.
How do I clean white or black spots on printed documents?
Description:First make 10 to 15 copies of a blank, white sheet of paper.
If you still see the spots on printed documents after making multiple copies, clean the drum unit as follows:
Remove the drum unit and toner cartridge assembly, and then remove the toner cartridge from the drum unit.
the print sample in front of the drum unit so you will know the exact
position on the drum that is causing the poor print.
Turn the black gear on the drum as you check the surface of the OPC drum.
The OPC drum is photosensitive so do not touch it with your fingers.
you find the substance on the drum surface that matches the print
sample, gently dab the surface of the OPC drum with a cotton swab that
is lightly dampened with isopropyl alcohol.
Do not use a scrubbing or wiping motion because this might damage the drum.
Do not try to clean the surface of the OPC drum with a sharp
object, such as a ball-point pen, because this might cause permanent
damage to the drum unit.
If the print quality still has not improved you need to install a new drum.
There are lots of things that can cause this. Inspect the fuser assembly & verify that there isn't any teflon missing from the upper roller & that the lower roller is clean. The spots can also be caused by a build up of waste toner in the cleaning assembly, causing excess toner to be dropped on the copies as they pass under it. The cleaning assembly would need to be removed & cleaned to correct this. The spots are not always in the same place - but are they the same pattern? A worn drum assembly can cause spots that are usually a repeating pattern but located in different parts of multiple copies. Dirty corona wires can also cause random spots & rewiring the coronas would solve that.