HP LJ4000N, jams in fuser.

[Hansoon]

HP LJ4000N, paper stalls when it enters the fuser for roughly an inch, sometimes two, giving a paper jam indication. The sheet of paper is not at all nicked or damaged. Fuser exit sensor seems to work cause when I manually actuate it it gives a jam indication straight on. Take up rollers and fuser unit are almost new. Fuser rollers seem to nip the paper normally since removal of the jammed sheet needs some force.


Any idea's where to look?

.......and yes, you're right I'm a HP-Noob.....


Hans

[Dickie]

Re: HP LJ4000N, jams in fuser.

Is it an original or a reman fuser ?

Usual cause of this is failure of fixing film to rotate freely due to lack of grease on the contact heater bar.

Try another fuser if you have one handy

[Hansoon]

Re: HP LJ4000N, jams in fuser.

Yes Dickie, re-manufactured fuser but from a well known supplier. I would normally try another fuser unit first but have none at hand for the moment. Any other indications that the fixing film isn't rotating before I submit a claim with the supplier?

Hans

[Dickie]

Re: HP LJ4000N, jams in fuser.

Just take out the fuser and try to wind a sheet of paper through it by winding the drive gear by hand.

Also if you have any of the white grease try putting more on the heat bar.

These fusers are easy to split and work on

[blackcat4866]

Re: HP LJ4000N, jams in fuser.

What jam code?

[BuddyMc]

Re: HP LJ4000N, jams in fuser.

I have had this happen too, it usually goes back to the fuser assembly Teflon roller not rolling because of to little grease. As others have stated, disassemble the fuser and re-grease it, the problem should go away.

[Hansoon]

Re: HP LJ4000N, jams in fuser.

Thanks guys for all your info.

Re-Grease it with what? Silicone oil will do? (I'm a noob. 'told you...)

Hans

[Blizzoo]

Re: HP LJ4000N, jams in fuser.

Uniflor grease.
Does the pressure roller and bushings in fuser assembly looks good?

[NeoMatrix]

Re: HP LJ4000N, jams in fuser.

Uniflor grease.
Does the pressure roller and bushings in fuser assembly looks good?

Is that the high temperature grease that comes in a 300ml pressure pack can and around 80-90 dollars a can ?
I could never read the foriegn writing on the label of the can ...

How much grease should be applied/recommend for the fuser bar relube ?

[Blizzoo]

Re: HP LJ4000N, jams in fuser.

Is that the high temperature grease that comes in a 300ml pressure pack can and around 80-90 dollars a can ?
I could never read the foriegn writing on the label of the can ...

How much grease should be applied/recommend for the fuser bar relube ?

Yes,or 100ml tube.
I personaly put a thin layer over fusing resistance bar and make sure cover the entire surface and some on film bushing.Before that five a good clean over old grease.If you put too much grease,won't fuse the toner properly on paper.

[theengel]

Re: HP LJ4000N, jams in fuser.

I've always thought white lithium high temperature grease works best. But I have no idea where to get it right now. I tried using regular white lithium, and I was back in two months with the same problem. At this moment, I'm using regular old fuser oil--the kind we use to use on fuser units that got poured into those little pans and a wick roller would dip into it and carry it to the heat roller. I still have like ten bottles of that stuff.

[prntrfxr]

Re: HP LJ4000N, jams in fuser.

Not all types of grease work. HP high temp grease is better. I do not recommend lithium grease.

[Hansoon]

Re: HP LJ4000N, jams in fuser.

So no silicone oil?

Hans

[theengel]

Re: HP LJ4000N, jams in fuser.

I think fuser oil is silicone. I'm pretty sure HP's fuser grease is silicone.