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Re: Repetative mark along right side of printed page.
Roller is misaligned somewhere or gear is broken. It will repeat every several inches depending on the diameter of the roller and the section that broke. A small section break that repeats every three inches indicates gear malfunction on a roller whose circumference is approximately three inches.
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If the lines go all the way down the page, check the position of the corona wire cleaner tab (blue or green) at the top front of the drum unit. if not parked fully to one side it will create a solid black lines where it blocks the laser. Otherwise look for some other foreign object (or torn paper piece) that may be blocking the laser from the drum. If the lines are thin and shark, check for scratches on the drum (not repairable without replacing drum). If the lines are uneven thickness but in a pattern that repeats down the page every few inches, then the film on the drum is probably worn or wearing away and the drum needs to be replaced.
This is a problem with your paper. Using multi-part forms on an impact printer will get lighter print on each layer working from the top form to the bottom. The "carbon" paper has to impact the paper hard enough to make the marks. If your top and bottom copies look good but some in the middle are light it is a problem with the "carbon" paper and not the printer. Now IF the top page is light and each copy under that is getting lighter then you need to close your platen gap (the lever on the right side of the machine mark A B C) go one click at a time (darkening) until the print quality looks good (or you go too far and it pinches the paper and jams *not good*)
Print 3 pages. Use the manual feed tray. As they print, open the cover, remove the toner and look down at the paper in the printer. Do you see marks along the edge? If no...replace the fuser. If yes...it could be the transfer roller.
As i can understand whenever you try to print with rear door closed printed page should come on top from top output roller however paper gets jammed.
Try to print a page using rear door open and it should come out from the rear drop down tray it printed page comes out successfully with rear flap open than paper gets jammed at top due to faulty top output roller.
However if the paper gets jammed at fuser with rear door closed than it is issue with fuser in that case you need to get fuser replaced at the same time replace 20 tooth gear next to fuser.
It sounds like an alignment issue. If the first line prints correctly, there could be something stuck in the print-head path (like a piece of paper) or the "encoder strip or wheel" could be dirty.
Unfortunately the unit would have to be opened and inspected. Lift the lid and look under the top cover to the extreme left and right to make sure there is no loose piece of crumpled paper stuck inside.
If this doesn't produce any results, try printing out the alignment page. Press Ink, then test print, then alignment. Print the page. There should be two sets of patterns. Zero represents a perfect pattern. Enter the number beside the pattern that looks closest to zero. You can see a line to each side of each pattern. Always choose the pattern where the line looks like one line, and not like two. If all you can see is patterns with two lines beside them always choose the lines that are closest together. The machine will move your selection to position 5. Print out the test again and select the best pattern again. Keep doing this until the checkerboard effect disappears, and the two lines on each side of pattern 5 have become one line. You may have to do this 10-15 times IF the alignment has gotten really bad. If this doesn't help, or if it gets worse the unit will have to be opened and the encoder strip and encoder wheel cleaned or replaced.
If the smudges are gradually fading then it's likely just excess toner hitting the fuse drum. Try a few cleaning cycles/test prints and see if that makes it go away. If not, see if you can get a replacement toner.
To clear stripe....Open the front cover and look on the inside of the right side of the printer....There you will see a pictorial instruction showing the PRINTER HEAD cleaning procedures.
Follow them (remove tab/plug on right side, pull out on head lock arm on inside right, then fully pull out the printer head arm inside the port on the (outside of printer) right side.....Then push it back in, replace tab cover, push the lock back in (inside right-front) and problem solved.....
It is probably both the fuser and the firmware.
Power Off/On and see if the firmware issue goes away.
From the control panel go to the Diagnostics Menu and select Print Event Log. It will give you a list of errors and what they pertain to, along with the page count when the event occurred.
Open the duplex pan (at the front of the printer, open the paper tray, and push the green button on the right in the tray cavity) and check for any small piece of paper that may be in the path. Verify that the hinge of the pan (where it connects to the printer chassis in the rear below the fuser assembly) is attached and not off its hinge. This can cause duplex jams. Additionally verify that the rear cover is not broken as the printer uses this to turn the paper.
Behind the rear cover is the fuser assembly. It may have a torn fixing film sleeve at one end or it may be contaminated, which can cause your image problem. It covers the ceramic heat element and sits above the lower pressure roller. One way to verify if the problem is the fuser is to print something from the control panel (like the configuration page located in the Information Menu). When the paper is under the cartridge but has not entered the fuser power off the printer. If the image mark is on the page its not the fuser because the paper hasn't gone there yet (try a new cartridge) if it is not on the page then the problem is the fuser.