I have a HP LJ 4350 that prints about 600 sheets a day. The printer is starting to fold the paper on one corner. I did a full p.m. and. test. The pages will print but some of the pages are folded at the top corner and is printed on the backside. What causes this to happen. The paper is folded before ink in placed on the paper.
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Sounds like an issue with the feed rollers. The roller on the left side might be hung up and is causing the corner to fold over when the paper is pulled through. I would try checking the feed rollers in either the actual tray or the back of the printer. Another thing to check is the other tray (the manual one). Does the paper fold? this should help you narrow down where the problem lies.
teflon coating on heat roller in fuser is coming apart. replace the fuser. also check to make sure the paper tray is set to the correct size. this means pull the tray out, remove all paper, look inside to make sure the arrow is pointing directly at the correct media size you are using i.e. letter or legal or whatever you are using. Good Luck! please rate this carefully.
Look on the left side of the tray. There should be 3 white fingers that stick out. Make sure they aren't broken or out of place. Also slide the paper size lever and make sure they work properly.
There is also a custom and standard switch.
Try to print out of the MP tray(fold down tray). If it prints normal speed, you probably have a problem with the tray.