HP LaserJet 5si, 8000, 8100, and 8150 Gear Noise

This last year I’ve been experiencing more calls due to noise coming from the left side of these machines and, in extreme cases, the noise is followed by jamming in the face-down delivery assembly. When you close the back door on these machines a swing plate gear drops down and meshes with the top gear on the fusing assembly. Over time this gear gets worn down and a noise develops.

What I’ve noticed is that the swing plate gear noise is gradual and because these machines typically are noisy anyway, customers tend not to notice a problem until the printer starts jamming or the noise gets extremely bad.

To check this out, turn the machine off, remove the fusing assembly and check the gear. If you’re looking at the inside of the machine from the left side the gear is located on the bottom left part of the delivery assembly.  It’s spring loaded so you can pull it down and get a good look at it. If the teeth are worn down it’s pretty obvious. If it’s really bad and jamming all the time you can further test it by running a paper path test from the information menu and send it to the face up exit assembly. The paper will exit out the left side of the machine and drop on the floor if the tray is not there but this test will verify if the fusing assembly is causing the problem or not.

Another way to check is to see if the rollers on top of the machine are rotating. If the teeth on the swing plate gear are stripped out, the exit rollers on the top of the face down delivery system will not be functioning correctly. Sometimes they don’t turn at all and other times they will turn only intermittently. The gear is not sold separately so if you find this to be the case then you will have to replace the face down delivery system. It’s not a tough job and because of the age of these machines the parts seem to be getting cheaper by the day. Right now these are some of the cheapest HP machines to own and operate because of the cost of parts and toner.

HP LaserJet 5si, 8000, 8100, 8150 Face Down Delivery Assembly RG5-1874

Kevin Gumpp is a certified printer technician and freelance writer for Market Point. 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 maryp@marketpoint.com.

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