the Ljet4000N headache

[EricF]

I've been battling with a very well use Laserjet 4000N the entire day.
With help from this site as well as a lot of internet searching, I was able to find the problem that's been lingering.

First I got printer codes 41.5 and then a 13.1
I cleaned and reseated the gray rollers and that didn't help.
I tore the printer apart as far as I could go looking for a solenoid next to an "L" bracket that I couldn't find. Blew a lot of dust out anyway.
Well whatever I did the codes have not come back.

However one of the old issues is still here.. When I goto print a config page, it prints the page and all seems fine. When I go and print it again, a black page shoots out as fast as I can push the Select button. and then the config page spits out.

Before, I was getting a paper jam error, whereas nothing was jammed.
I'm honestly willing to live with this because I'm tired of looking at this poor printer.

Any ideas what's causing this to get a blank sheet readied, but no codes kicking in??

Thank you!

[MichaelTech]

Both are media feed issues. Could be paper size settings.
Pull the MP assy. and replace the feed assy.
Check the base for a sticking solonoid in the P/U assy. {remove the engine}

[woodss]

replace the following parts:


feed assembly
4 pickup rollers that are shaped of the letter D these are in tray 2
2 Feed rollers also in tray 2
Torque Limiter
Clean the soleniod in tray 2 assembly and place eletrical tape around the metal plate.


Doing this will solve this problem.