How many revolutions should the feed rollers make per sheet when feeding paper on a hp 4000 laserjet

[Ljtsirk]

Having trouble with paper feed on hp 4000 laserjet will feed 4 sheets then feeds a multiple sheet and getss a 41.5 error then a 13.xx paper jam error. Feed rollers seem to turn all the time causing a timing issue. Have replaced the grey rollers in unit and tray

[east2100]

It's about two.

If you put a stack of paper and want to print just only one then HP 4000 should grab only one and stop but actually it grabs one after another and both of the two papers jam which one stops nearby the exit and another one just input into HP 4000.

Most of the time it will act like what i said then you have a so called Sticky Solenoids problem and it's no big deal every HP 4000/4050 will act like that and no exception.

Take care of the Sticky Solenoids and do it well just one time and it will happen again.

There're two solenoids on HP 4000 bith of them seat at right side of HP 4000 and one for tray1 another for tray2.

http://westhillprinters.blogspot.com/2011/12/sticky-solenoids.html

You will need a Service Manual google and download it.

There're some videos on YouTube hope it will help.

https://www.youtube.com/watch?v=OCm9u0N1bsc

https://www.youtube.com/watch?v=H8FqYtgBNgU&list=PLbdSTfgWzBfXi32poZ2jCMVwya0S2JDP6

https://www.youtube.com/watch?v=NkjSkiDXno0

[Ljtsirk1]

thank you I will try that at the first opportunity I have

[Ljtsirk1]

It was indeed the sticky solenoid , this solenoid on the HP 4000 is located at the front of the printer to the right of the paper tray. I took the whole printer apart before I actually found the solenoid but it's working now thank you