I have a hp 4300 laserjet tha is giving constant paper jam. The jam happens just as the paper goes in the fuser assembly
Did you reset the maintenance kit count after installing? You could still have a bad sensor.
Does it jam at the fuser when doing a single print?
These machines have a Maintenance kit required every 200 000 prints, these MK's include all feed rollers, a transfer roller and the entire fuser assy. To replace the kit fixes all issues I've seen in these printers besides when the cartridge affects print quality.
If it is jamming at the fuser on a single print done via the printer operations panel, and your paper is fresh, it could only be the feed roller having trouble gripping the paper or the fuser not turning/stuffed.
Feed Kit, I have my doubts as to this being your problem
Maintenance Kit Fixes 98% of the time
Was is noisy before it died?
I have seen a few with stuffed fuser drive gears but not many and customers could hear it wearing.
How many prints since last MK? via keypad print a configuration page, count is there ie pages since last maintenance xxxxxx
MK part info
Notice that no tools are required, so you might as well have a look at the bits on your machine, see the 5 feed rollers, inside the centre you can see a plastic tab that one just pushes in and the feed roller slides right off the shaft, that you can see with cassette removed, there is also one on the cassete and another near the first, the cresent shaped roller, clicks into tray 1 feed, Back door of printer just comes out when you push on the tabs near hinge point on each side. then fuser is released by it's two blue tabs.
oh and the other funny hook is for hooking out the old transfer roller (pictured).It lives in base of machine, remove cartridge and you will find him.
If you have extra cassettes ie DTN or TN you can switch rollers from most used tray to least, but like I say you might well have a stuffed fuser. You can buy just fuser and just feed rollers, ie info link.
Fuser is not installed fully, or fuser drive gear is faulty, would of been noisy pre kit
jams on a single page?
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Just to mention a new maintenance kit was put into the printer
paper jam on a Laserjet 4000
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