HP Color LaserJet 4600dn Duplex Jamming

**hydrosam** · 04-13-2017

I have an HP Color LaserJet 4600dn that has given me all sorts of problems with duplex jamming. It gets the 2nd page stuck in the Paper Pickup Assembly about an inch into it with the preceeding page stuck halfway through the fuser (on its way back INTO the printer to have its second side printed).

I followed this guide: http://www.lbrty.com/tech/tarticles/ta46xxJAM.pdf which helped me replace the RB2-8306-A Junction Guide Assembly. I've also swapped out the paper tray and tried swapping it with a known good feed belt, but neither of those did anything. Does anyone have any idea what might still be causing this jam? Is there a sensor problem that I'm missing somewhere?

**theengel** · 04-13-2017

Look at the event log and see what the exact code is. Maybe that will give you a clue as to which sensor is sensing the jam.

**Phil B.** · 04-13-2017

i had a few like this.. ended up being the paper feed assmy

**Lance15** · 04-13-2017

+1 on the paper feed assembly. Have replaced a bunch of these assemblies for jamming. A deflector breaks off of the assembly and produces jamming, mainly on duplexing

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**theengel** · 04-14-2017

Yeah, I remember that now. They're pretty easy to replace... and cheap.

**hydrosam** · 04-14-2017

When you guys say "paper feed assembly" do you mean what's also called the "Paper Pickup Assembly" part # RG5-7453 (or the thing I thought I fixed, ugh!)?

Here are some pictures of the stop condition when the error happens. You're right that the lead page is about 2 inches into the Paper Pickup Assembly (having gone past the end of the back-side of the transfer belt) when the error happens.

https://1drv.ms/i/s!Aq_pRgLaMqbgi7VD0ouWp5WA9o-98Q
https://1drv.ms/i/s!Aq_pRgLaMqbgi7VCGpllm4rZxye6rg

Thanks for the tips!

**theengel** · 04-14-2017

Yes... RG5-7453

It's not fixable. The little plastic pieces snap off.

**Lance15** · 04-14-2017

It is actually fixable. I've refurbished these in the past.

https://www.partsmart-corp.com/other...evised-version

I think that's the deflector/guide.

or this:
https://www.partsmart-corp.com/other...junction-guide

**hydrosam** · 04-22-2017

Those are the parts that I replaced on the existing one and am still having the problem. I'm going to try replacing this part and will report back on if that solves the problem.