Many people who repair their own HP printers change the feed rollers and continue getting jams and decide to call it quits at that point. They cant understand why it’s still jamming. The problem more than likely is the Paper Feed Solenoids. Look in the event log. You will see 13.98, 13.02, 13.03 errors if the solenoids are having issues.
It’s a hassle to have to pull all the covers off just to see if the paper feed solenoid needs to be replaced. Here’s a way to test them so you don’t have to. This test applies to Hewlett Packard Laser Jets 4200, 4300, 4240, 4250, 4350, P4014, P4015, P4515 and many others.
Go into “Diagnostics” and “Paper Path” Test Mode.
Set it for 10 prints, single sided and select the tray that you would like to test.
Pay close attention to the sound, speed and rhythm of the machines operation.
If the solenoid is good you will hear the same rhythm and operation through out the test. But, if there is an issue with the solenoid you will notice a pause. It will “hiccup” and pause just for a moment, then continue. If it is really bad, it may end up jamming or become obvious that the foam is totally destroyed.
You will become acquainted with this and be able to quickly tell if there is a problem. If you don’t do it that often you may have to pull the solenoids off to test them. It’s very subtle but if you do it enough you’ll be able to spot it right off.
Look at the following Video below. I am testing tray 2 and tray 3 on a Hewlett Packard Laser Jet 4250. First is tray 2 with no problem ( Just Changed it) and next is tray 3 with an obvious problem with the solenoid.
Remove the Solenoid and do a visual inspection.
See Video Below
Replaced the bad solenoid with a “New Solenoid RK2-0269”.