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You may not need to clean it off the transfer belt - which kind of damages easily, and which you (besides that) are having difficulty removing.
If these are all photocopies, that have a line on them, and they are all made through the document feeder on top of the machie, then you may have a problem with the scanner glass used by the document feeder.
To test this, just place one blank sheet of paper on the scanner glass sheet, and photocopy that four or five times. See if the line fades away at all - or possibly, rapidly - while doing so.
If the line fades away by 4 or 5 copies made on the glass sheet, then you probably have dirt on the scanner parts. Let me know if that is the case, so that I may advise you further, as to how to deal with the problem.
My first thought was that the toner cartridge might be defective. But your printer's toner cartridge is just a simple 'bottle'.
Is the line on the pages sharp-edged, or blurry? narrow, or broader?
Sometimes such lines can be caused by toner (or other dust) on a corona wire. Have you cleaned the corona wires yet? sometimes in some models, this is done with a sliding tab, that is usually brightly colored. If done by hand, it should be done with a dry fresh cotton swab, and delicately since if the wire breaks, it will damage the printer worse and make it unusable until the wire is replaced.
OK, I rather thought so.
One more thing that's mentionable: usually when the 'drum' is scored or damaged, the edges of the resulting line on pages is rather sharp-edged, but this might be an exception.
Check the 'drum', in the position corresponding to the line on the pages, briefly, without touching it, for any scoring or damage.
Then also (after the printer has been Off for at least 10 minutes, to allow cooling time, since the fuser is heated to a temperature high enough to cause burns when touched) check the fuser rollers. Damage to them might cause the line in question.
Right - so the line on all the printed sheets is always yellow?
OK. I'm not sure I can provide more assistance with this case. But also check the fuser rollers for scoring or damage or just plain lines on them.
I have no such information. I have Opted Out, with apologies, opening the case to other Experts in this category. Thank you for your patience and for following the case this far.
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Okay. You have tried the chat option once already. I offered the remote option as a favor, but I now understand you do not want that. I will go ahead and opt out and allow another person to chat with you.
Hi, I'm Carl and I will be assisting you where Jason left off. I don't believe I saw any mention of using the Laser Printer Cleaning Cycle on the Printer's Utilities Menu. This is specifically designed to clean the Transfer belt of any minor Toner collections. Anything major would require a soft cloth to remove the Toner from the Transfer belt. Perform a test a remove what you can from the transfer belt, even if it's a small amount then print a good 5-10 articles and see if that cleaned area remains the same or is collecting Toner again. This will indicate whether or not cleaning mechanism is functioning properly and/or the Transfer Belt is scored from Debris or the Drum and is no longer able to clean itself of charged Toner Particles.
If you need any clarification or additional help, please feel free to ask me.