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If the crease is a corner fold or a pressure line down the page, it will often be caused by something in the paper feed path close to the main drive bar in an inkjet or near the fuser in a laser printer. Have a look at the leading edge of the paper as it exits the printer for a nick or mark that may give a clue where to start looking. If there is a fold or crumple line down the length of the page, look at the paper pick up mechanism in an inkjet (usually the paper tray is a good start) or if it is a laser printer you should remove the fuser and check the fuser sleeve and pressure rollers. If you could let me know what the machine is and where the crease is I may be able to give better advice.
A crease is usually caused by two issues. 1 ) paper is hitting something on the way to the fuser causing a skew. This type of problem would be repeatable every page as well as causing the image to be off centre. The 2) reason is the more likely cause. A bearing on the lower (pressure roller) is beginning to seize. Causing paper not to feed straight through the fuser. This cause a wrinkle from from to back on the sheet of paper. This wrinkle although repeatable generally the wrinkle position up or down on the sheet. This gives the impression of something that is getting in the way of the sheet. If you can change your lower pressure bearings you should be ok again.
It is better to try with good brand printing paper as the lower thickness of the paper will only make the paper crinkle within the roller as it will BITE into the roller and be pulled into with different tension.
So test with another brand to confirm. If not the roller alignment must be checked.
Sounds like you're having a problem with the automatic document feeder. The scanner is continuing to scan but the paper is not advancing as it should during the first part of the infeed. Check to see if something is inside retarding the path of the scanned document. Or it could be worn rollers in the ADF.
While the line is showing up on the output pages. Stop printing and put paper in the manual feed tray (tray 1). Start printing again. As a page gets pulled into the printer about 1/2 way open the top cover. Pull out the toner and look at the page inside the printer. If it doesn't have the grey/black line, get the fuser replaced. It is defective.
If the paper under the crease has print and the fold is "glued down", it is most likely to be a problem with the fuser. Try removing it and look for evidence of warping in the pressure roller. If the fuser looks clean and tidy, go to the other end at check over the paper tray and paper feed mechanisim. It is possible the paper is catching on something at the start of the process. This is most likely if there is print over the crease but not under the fold.
This is a known problem. Kyocera pretends to produce very silent printers. Therefore certain sheet metal parts inside the printer have a small piece of sponge rubber at their endings. Unfortunately over the years this sponge rubber gets sticky. The corresponding lever, that is covered at its end with sponge rubber, sticks too long to its initial position. This is the reason why a certain lever is moved too late by the electromagnet into the position where a certain pulley is released.
As a result printing and paper movement are no longer coordinated and the printout is too low on the sheet.
Solution: Get rid of the sponge rubber, clean the lever very well in order to avoid it from sticking in its initial position. As a result you will here a much harder metallic noise when the lever moves, but the printout should be o.k.
depending on what the lines look like it could be the charge roller or transfer roller.
A defect on the charge roll appears as black areas on the front of the test page, and as light gray areas on the test page.
A defect on the PC drum of the toner cartridge appears as white areas on a dark, full–coverage test print and as black areas on the "text only" test page.
I have also seen a line with a 'ridge' on the paper. This will appear almost like an embossed line. This was caused by the fuser roller being scored by debris.
First thing to check is try it with a fresh unopened ream of quality paper, paper with too much moisture content, drys out and goes wavy when it runs threw the fuser roller at rear (180 deg), otherwise it will be the fuser rollers themselves causing your problem, which means that you need to replace fuser assy