bizhub 420 duplex jamming

[brent]

we have a bizhub in the field with 550k jamming here and there. but it will not duplex. simplex is fine.
the jam I thought was out of tray 1. but tray 2 is the same. there is one jam coming out of the tray. one folded in the fuser. and one is in the duplex transport on the side. there was a thread on this somewhwere but I could not find it. could someone shed some light on this situation? thanks

brent

[copytechman]

Try replacing or cleaning the 2 duplex transport clutches, solves a lot of problems!

Regards!
A.

[fixthecopier]

I second that. If it will duplex legal, but jam on letter, change both clutches.

[rocky246]

I agree. KM puts too much grease on these clutches and it migrates into the clutch. Since its somewhat involved to replace them, I always do them as a set.

[brent]

so are these the 2 clutches you can see when the vertical transport/duplex unit is pivited down? if so I replaced them. the jam is in the duplex. but always in the same spot. the actuator that is wide twards the top. the paper stops within one half inch of that. the paper is folded with 2 pieces below that. and one in the duplex itself. these people don't use duplex that much. but I still would like to have all my machies working. any thoughts? sensors? thanks

brent

[copytechman]

You can't see these clutches @ all without removing the duplex side cover (which can be a bit of a chore) .. they're not visible just by opening the jam access covers. The 2 clutches drive the 2 vertical drive rollers inside the duplex jam access cover.. and those 2 clutches are attached to ends of the shafts.. Are those the ones you changed because u may have changed the reg/relay clutch combo (right below drum unit?) and iirc they are visible when you open the side cover and pivot the duplex unit away from the machine..

Regards!
A.

[brent]

I did not get to the duplex clutches apparently. I am going to replace those duplex clutches tomorrow and se how it goes. you guy's must be on the right track. because the machine is definitly jamming in the duplex top roller area. thanks again

brent

[brent]

I have been through the entire service book. but to no avail. where in the book does it discuss the dissasembly and reinstallation of this duplex section? thanks

brent

[fixthecopier]

Brent, just remove the unit , you will see there is only a couple of screws holding the side cover on the duplex. The two clutches are the same, one on top and one on bottom, and are not hard to swap out. That is why the manual does not go into detail, as far as I know. You won't have any problems.

[copytechman]

Um yah, do like fixthecopier said! There aren't any dissassembly instructions for the duplex (hence the term "chore"). Go with what he said since it's kinda hard how to describe how to remove that cover.

Regards!
A.