Under the drum there is a thin ****-glass. Make sure there is nothing on the glass. Do not use compressed air to remove the debris from the glass. Use a dust cloth or such. Using air will blow the debris into the laser unit and it will have to be taken apart to be cleaned.
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If you are seeing vertical streaks/black lines your primary corona wire is dirty and or the fax scanner may be dirty. 1)To clean the corona wire you take the drum unit and toner cartridge and place it on disposable paper to avoid spilling. 2) Clean the primary corona wire inside the drum unit by sliding the blue tab from right to left several times. 3) Return the blue tab and snap it into the home position. 4) Reinstall the drum unit and toner cartridge. 5) Close the front cover. Caution: if you do not return the blue tab to the home position it may repeat the black lines.
This is from a previous
post and may help with your problem. I have printed 1000's since I came
up with this fix with no recurrence of any streaking. Let me know how
this works for you.
I have come up with the cause
and a fix for the above problem. This also fixes the problem of lines
running the direction of paper travel on color prints. Black and white
prints are OK. If you have a warranty on your printer or drum unit then
you can have the drum unit replaced and hope you get a good replacement
drum unit. To fix your drum unit do the following:
1. Remove the drum unit from your 3100cn.
Set the drum unit on a clean level surface and avoid touching the drum
or the transfer belt (the decal with 4 arrows points to the transfer
3. Remove the 6 screws from the top cover (the cover
has the blue handle attached). Two screws are on top at both ends of
the blue handle. The next 2 screws are on the sides and line up with
the decal with 4 arrows. The last 2 screws are also on the sides and at
the lower corners of the big decal that shows how to remove the drum
unit from the 3100cn.
4. Carefully lift the cover from the
drum unit and cover the drum unit with clean paper to protect the
transfer belt from bright light. You can
carefully reinstall the drum unit without the top cover and run some
color prints. If the lines are gone then continue with step 5.
Look at the ribbed side of the top cover. Some may show some toner
build-up. Some of the rib intersections are too high and are dragging
in the toner that is applied to the transfer belt. The ribs are there
to add stiffness to the cover and to keep it from bowing.
6. Place the cover handle side down on a clean towel.
Using a palm sander with 320 grit sandpaper and light pressure (the
weight of the palm sander) sand until the ribs going both directions are
showing signs of being sanded. You will be able to see the difference
as unsanded areas will be glossy and sanded areas will have a dull
8. Switch to 600 grit paper and do a light sanding.
9. Wash the cover under cool water. Don't use hot water since that could cause the cover to bend.
10. Dry completely. I used compressed air.
11. Reinstall the cover to the drum unit. Tighten the 4 side screws first and then the 2 top screws last.
12. Put the drum unit back into the 3100cn and try a color print.
13. Please post if you have any questions about the procedure.
14. If your next drum unit has the same problem you can swap top covers.
vertical lines on prints usually means either the drum's cleaning blade is not cleaning the drum (or the drum is damaged) or the fuser is scored. scored means that the protective coating on the fuser rollers is damaged. I would check the rollers on the fuser (the hot part of the printer right near the paper exit) for any lines on it, if you look at your prints, you should see them in the same location on the fuser. if you do not see any lines on the fuser rollers, then replace the drum.
Vertical lines or streaks
Check for a leak where light might be entering the printer.
Check for circumferential scars on the photosensitive drum. If scars are present, replace the
drum cartridge if the line goes through all colors.
Check for circumferential scars on the upper fusing roller. If scars are present, replace the upper
fusing roller if the line goes through all colors.
Remove the imaging drum and inspect main charger or imaging drum for a contaminant, such as
a fiber, if the line goes through all colors.
CAUTION Do not expose the imaging drum to light for more than 15 seconds. The drum is light sensitive, and
exposure to light can cause permanent damage.
Vertical black lines
The toner cartridge is defective.
The toner cartridge is not seated properly.
The fuser entrance is dirty.
The fuser has scratches on it.
This might be a repetitive defect. If so, the lines will repeat at a consistent interval down the page.
The printer needs to be cleaned.
There is a problem in the heating element.
Vertical white lines
If white lines or streaks appear only in the black areas of the printed media, print several
configuration pages to clear the anomaly. If this does not clear the problem, check the sleeve
surface to confirm the defect, then replace the black toner cartridge.
If white lines appear only in a particular color, try printing several configuration pages to clear the
error. If the error does not clear, check the sleeve surface to confirm the defect, then replace the
defective toner cartridge.
There is a lack of toner or the toner cartridge is faulty.
There is dirt in the laser path.
The fuser is defective.
A mirror in the laser scanner is dirty.
Is there toner streaks on the drum? Remove toner cartridge and push back the drum cover (on bottom)to check. Could be just another bad cartridge. If the drum is clean, then it's coming from the fuser. You can have it replaced /rebuilt, but I personally wouldn't spend any money on this one.
check your drum unit. The toner cartridge mounts into the drum which can be permanently charged causing a constant streak to occur.
Solution: Remove the toner and drum unit. Clean them off with a non-fuzzy non-rough cloth or paper towel. Pay particular attention to where the streaks are in relation to the toner cartridge and drum. If you clean it off and you still get streaks check whether they transfer from the toner or just from the drum.
There may be a way to discharge the drum, otherwise you need a new drum.
If you're getting white lines, you are running out of toner, but if the lines are black, I believe the drum is the problem .Remove the OPC drum
and check its surface for lines, if there are any lines, you can bet it will be
printed on the paper.
Chip reset device for Konica Minolta Bizhub and CF imaging units http://www.chipreset.eu
It sounds like the drum may need to be replaced. The streaks may be caused by sections of the drum no longer being able to hold a charge and therefore, toner will not properly stick to the paper in those sections and you'll be left with long white streaks on the paper. This is a usual symptom of a bad drum.