asked Jul 20, 2011 at 1:37am
Hp HP LaserJet 4

HP Laserjet 4 LOUD CLICKING Noise

I have an HP Laserjet 4

The printer started making a loud clicking noise. At this point I can not even get it to print. When I try to print, an error message pops up on my monitor stating there was an error with the printer.

However, when the noise started the paper was pulled into the printer, but did not make it to the fuser. The toner image was completely on the paper, but could be wiped off since it had not gone through the fuser.

What I can see is that the 6th gear at the back of the main gear assembly is missing two teeth, so I know this is going to have to be replaced.

Upon inspection of the gears on the fuser I noticed that the middle gear band is not missing teeth, however it has a horizontal split. It looks like a clean cut, so I am uncertain if it was manufactured this way, or if it is broken.

I am looking for a main gear replacement, and an instructional picture tutorial on how to do this. I also need to know if the second gear on the fuser is supposed to have a horizontal split. If not I need a gear and a tutorial on replacing this as well.

Any information is greatly appreciated!
This kit will replace the broken coupling gear and has a video tutorial http://www.fixyourownprinter.com/kits/hp/K21 We can also supply the heat roller gear on the fuser and a video tutorial for that as well.
by moe on Jul 20, 2011 at 9:11am Add comment
have another closer look at the metal gear on the fuser unit. sure it's not worn as well? usually you'll find that only half of it would be worn as that's the half that's driven by the coupling gear. the other half drives the heat roller gear and normally don't wear out.
by seriously on Jul 20, 2011 at 2:26pm Add comment
Seriously, the metal gear on the fuser unit does not appear to be worn. The only thing I found was a small piece of plastic caught between the teeth from the main motor gear that has broken teeth.

And again the gear ring that wraps around the heat roller has an even horizontal cut. This cut is so straight and smooth that it looks like it was made that way. Was it made this way, or is it supposed to be a solid ring wrapped around the end of the heat roller?
by DumpsterDiva on Jul 20, 2011 at 4:14pm Add comment
it's not meant to have a crack. so you need to replace that too.
by seriously on Jul 20, 2011 at 11:13pm Add comment
Where can I find the main gear replacement, along with photo instructions on how to replace it?
by DumpsterDiva on Jul 22, 2011 at 10:06pm Add comment
read moe's post above again :)

just click on his name to contact him.
by seriously on Jul 23, 2011 at 2:03am Add comment