Paper crinkles in fuser

My Lexmark Optra Rt+ b&w laser printer has been a workhorse for several years. Just this week, for no apparent reason, it has started consistently crinkling the paper as it feeds through the fuser (it happened every once in a while previously, but is now consistent). Heavy paper (24 pound) or labels still make it through without crinkles, but standard paper, including slightly textured letterhead, shows a jagged wrinkle.

B&W lasers have become inexpensive enough that I'm reluctant to spend a lot on getting this repaired, but I'm wondering if anyone has suggestions for a possible fix I could do myself.
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ElrondCTAsked:
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David-HowardConnect With a Mentor Commented:
It could be a couple of things.
The printer could have a defective paper-out sensor that is damaged or broken.
If the paper is wrinkled at the end, you could have a faulty paper out assembly.
(This could also include the output roller.)
The last thing that comes to mind is a faulty fuzer. If this is the case, you're better off buying a new printer.
I would start by manually inspecting the rollers making sure that there isn't anything stuck to them. (Unplug the printer first.)
As you stated, new printers can be quite cheap now. That coupled with a standard warranty and you might think about pursuing costly repairs.
David
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Andrew DavisConnect With a Mentor ManagerCommented:
Check if it happens with bypass.
Is the print on the page straight and alligned? could be the paper guides in the cassette. if the paper goes through on an angle then it may crinkle.
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ElrondCTAuthor Commented:
It wrinkles at the top of the page. I get wrinkling with any paper path--either tray or the manual path, output to the main tray or the direct-out tray. The rollers that I can see look OK, though I can't find a way to look at the rollers that feed the paper into the unit.
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nobusCommented:
was there sometimes used a "wrong" paper type? like plastic covered paper, or such ? that can cause meltdowns on the rollers / fuser parts
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ElrondCTAuthor Commented:
No, no special papers. On occasion, I use labels that are designed for laser printers; I've never seen signs of damage to the labels that might result in leaks onto printer parts. Otherwise, it's strictly 20-24 lb paper. I don't think I've even used labels in the last couple of weeks.
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nobusCommented:
can be worn rollers, or bad fuser .. difficult to tell
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