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The print unable is an error caused by build up of dust on the encoder strip.
Unfortunately there is no easy way to reach the encoder strip to clean it without taking the machine apart and putting the machine back together after you take it apart is not easy.
Paying to repair the unit is a little over priced and not usually worth it.
On the bright side, Brother's new line up of ink jet machines allows easy access to the encoder strip to clean it without hassle.
The white line or lines are NOT caused by the fuser. A defect "line" in the fuser would cause the symtom of the print rubbing off the page but not blank lines on your copy. First we need to separate your copy quality issues. This machine uses 4 drums, 4 developer units and a transfer belt. Most copy quality issues will reside in 1 or more of these units. Lets start with a few questions. 1)Are your copy quality issues ONLY on color copies? or are the black and whites poor too? 2) Are you running copies only thru the document feeder or have you made any copies from the glass?
Are you printing on the copier from your computer?
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.
White stripes are caused by dust and toner powder on the scanner window, which is situated in the bottom of the printer, under the drum unit. Open the printer, remove the drum unit and using a soft cloth with a little meths wipe the window clean of toner and dust. It's quite dark inside the printer, so use a torch to find the glass panel (only about 10mm deep x the width of the drum).
Sannaer glass is dirty:
Cleaning the scanner glass and white reference strip
Follow the steps below to clean the scanner glass and reference strip:
Remove any loose paper debris that may be present.
Carefully clean the white reference strip on the underside of the scanner cover (or top cover) with a clean, lint-free cloth, moistened lightly with isopropyl alcohol. Clean only the white plastic part on the scanner cover.
For those models that have a scanner glass, clean the scanner glass with a lint-free cloth, moistened lightly with glass cleaner. The HP Officejet K series and HP fax 1220 have a scanner opening instead of a scanner glass. Make sure that no debris is in the scanner opening. Use canned air to gently blow dust and debris from the scanner slot.
Replace all removed components and close the unit.
Plug the power cord back in and turn the unit back on.
Make a copy to verify the lines are not present. If lines are still present and there is nothing visible on either the scanner glass or the reference strip, the unit will require service.
Replace the drum. The drum is failing. When you replace the drum open the front door of the machine where thr drum and toner is. Hit the clear/back button. Press 1 That resets the drum count after you replaced the unit.
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.