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I had this issue with my HP 8550, I found 3 sets of mis-matched ram inside. Once I took out 2 of the sets, leaving 1 set of matched ram inside it took care of the booting problem.

Try replacing the upper and lower delivery rollers. This should fix your problem.

In the tray itself beside the feed roller is a plastic piece in the shape of a roller, I belive it is called a torx regulator. Anyway take that piece off, try to print if it prints fine without that...

In the 4000 printers you can switch tray 2 and tray 3 to see if the problem follows the tray itself or the tray bay, if you switch the two trays and the problem is still in tray 2 then Yes, Replace...

It could definetly be the Toner Cartridge, Try replacing that first. If that doesn't work, look at the fuser. The fuser is inside the back panel, and could also cause that kind of a problem.

KIM

Normally when you replace the Fuser with broken teeth you also need to replace the gear assembly. The gear assembly teeth turn the fuser teeth so it is not uncommon for teeth to be broken on there...

As far as I know there is no way to "clean" the drum, you could probably replace the drum itself instead of the enitre fuser, but for me it is much easier to switch the entire fuser.

The fuser will be the door on the left side of the printer as you are looking at the printer, open the door and you should see the fuser. Once you pull the fuser out, look inside at the drums and...

Check to make sure you are telling the printer what paper you are printing on, if you are printing labels tell it that before you print so it knows what paper thickness to expect. If that doesn't...

You can add additional Ram to these printers, it normally helps. But keep in mind the format of the document you are printing has more of an effect on how fast it will print. Example if these are...

Did you check the feed rollers in the tray, also check the D-shaped Rollers in each of the trays to make sure they are not worn, if they are replace them.

Seems to me that maybe your new fusers are not the problem. There is a main gear assembly on the left side of the printer, if this is not working it can make it seem as if the fuser is the problem. ...

It would not hurt to replaced the Feed/Separation Rollers, 2 per tray. I have found that they need replaced much more frequently than 200K. This is also probably the easiest solution if it works. ...

Here is a link to Printer Works that will take you to the diagram page of this part.

http://www.printerworks.com/Catalogs/8500-Catalog/250_8500DrumCartDrive.html

Check this website: http://www.printerworks.com/Catalogs/8500-Catalog/100_8500ExtCoversPanels_1.html

You should be able to find the part you need here.

KIM

Check out this Website: http://www.printerworks.com/Catalogs/EX-Catalog/260EXDriveAssembly.html

Printerworks.com gives you HP part numbers with Diagrams it is pretty nice, the link I gave you is...

My Opinion: If you are on a tight budget I suggest purchasing a HP LaserJet 4+ They are very durable printers with good quality. You should be able to pick one up for around $200 - 300 refurbished,...

Normally if you can't see a jam, check the paper tray to see if a single sheet of paper is pulled up over the silver tab, if it is the feed roller is bad. This will cause the printer to think it has...

Thanks for your help, it was the fuser. I didn't think to check that for a squeaky printer. Thanks again.

I have a LaserJet 4 Plus, It is Squeaking/Squealling when it initializes after powerup. It is also making these noises when the paper is exiting the printer, making me think this was the exit...