asked Feb 20, 2008 at 2:33am
Hp HP LaserJet 2420DN

HP2420dn paper jam 2/3 way out of fuser

Printer has done ~5000 copies. Problem started after attempting and failing to printing on 6x4 cards, and now no paper will go through - reports 'paper jam' and A4 sheet stops 2/3 way out of fuser. Reading on here I assumed it must be the exit sensor arm although I could see nothing wrong - I bought another fuser assembly, and it is doing exactly the same with new fuser.

I've no idea what to look at next, can anyone help?

Many thanks.
Check the registration sensor flag as it may be sticking and not flipping back right away and also cause a jam message.
by dmzcompute on Feb 20, 2008 at 5:13am Add comment
Thanks for the tip - where would I find the registration sensor? The error number I forgot to say is 13.06.00 - unknown
Refer to item 8 in the link below. You will want to check the flag movement for the top of page sensor as it is usually the flag which sticks and does not move back in time so the printer thinks there is a jam.

by dmzcompute on Feb 20, 2008 at 3:23pm Add comment
Thanks for your help - I took the printer apart at the weekend to look at this sensor, and in doing so noticed that there is a transverse rod across the paper path, after the paper pick up, below the toner cartridge. This is held in place by two coil springs wrapped round bushes, one on each end, with two flats on them. The RHS bush had jumped out of the housing and rotated through 90 degrees so it was being held out of its proper position. Simply rotating the bush allowed the flats to sit back down. On testing the printer it now works perfectly.

I have no idea how this could have happened - the printer has not been moved. I suspect when card jammed in it it may have been pulled out forcibly.
by unknown on Feb 25, 2008 at 3:11am Add comment