In recent months I’ve seen an increase in intermittent paper jams related to these HP 4200, 4240, 4250, 4300 and 4350 LaserJets. Unlike the last ten or so years, replacing the feed rollers isn’t always doing the trick. I’ve been replacing more and more pick up solenoids for the cassette tray pick up assembly.
When the solenoid actuates, the pick up assembly engages and lowers the pick up roller. There is a foam pad on the solenoid that dampens the noise when the solenoid actuates. As the machine ages, the pad wears down and the tape underneath causes the solenoid arm to stick. When this happens, the pick up roller stays down and occasionally picks up multiple pages.
Typically, if you’re only printing one or two pages at a time you won’t have too much trouble. However, if you are printing large volumes, it can be a more serious problem.
I’ve worked on enough printers with this issue that I can tell by the way it sounds when printing, that this is the problem. However, if you’re not familiar with the problem, the best way to tell is to turn the machine around, move the duplex accessory cover and dust cover on the cassette tray, then tell the machine to print 10 to 50 test pages from the diagnostic menu. The pick up roller (gray rubber / white plastic) should lower once per sheet of paper. If you see the pick up roller lowering more than once per sheet then the solenoid is sticking and needs to be replaced.
Below is a link to the service manuals. Replacing the part [RK2-0269] is not that difficult but a few steps are involved.
Kevin Gumpp is a certified printer technician and freelance writer for Market Point. Market Point is a HP PartsOne Partner selling HP printer parts. If you have a question regarding this topic or have any other printer repair related questions or topics for which you would like more information, please send an email to firstname.lastname@example.org.