Ricoh 1075 Duplex Jam

[nastech]

I am having a problem with a machine that i am currently refurbing its got about 4 million left of its life and is giving me endless duplex headaches

It jams only during a duplex run on simplex its fine.. i swapped feed stations 1 2 and 3 around not much use that was..

Now it tells me according to my logging data all the Jams occur @ Duplex exit sensor but where on earth is the duplex exit sensor?? i know of the 3 transport sensors only that follows the paper out the duplex..

Could clutches be causing this??

Please help

[schooltech]

Yes, it could be the clutches. But, what are the exact jam #'s you are getting?

Also, clutch jams usually will be erratic and cause the paper to jam in different areas of the duplex unit, rather than every single time. When it jams, what exactly is happening? When you do a 2 to 2 with one sheet, and watch the paper, are the solenoids activating and sending the paper under the unit?

When doing simplex copying with 2 or more copies, does it invert copies ok to make them exit face-down?

[cobiray]

With that many clicks on the machine you should check the duplex guides (the ones that move back and forth to jog the paper). I've had them wear on the inside where the edge of the paper rubs. Eventually it will wear through the guide. Also check the exit guides on the left side of the duplexer for burs or wear. At 4 mil plastic can start to wear down from all the paper moving past it.

[Ollie1981]

What state are the registration guides in?

Pull down the "B" flap and have a look at the black plastic mylar strip behind it, a good indicator is if it's black without white wear marks, if it's chewed, creased or has holes in it then you need to change it. The whole registration section has to come out, a pretty gruelling job.

It may sound weird why this would cause duplex jams but trust me, these mylars sit pretty much at the point where paper from the tray is interleaved with paper leaving the inverter, with a fast machine like this even a slight timing deviation will cause jams.

Also has the machine ever had developer leak over the feed stations?

[Jimbo1]

Another goody is the torque limiters in the feed sections. As fast as they are I have had problems with these that didn't cause a timing issue till the paper got round to the duplexer exit..

Here's a thought. Is this all during duplexing jobs? You can turn off the inverter and run and see if you get jams elsewhere.

[TonerMunkeh]

Hell, if it's done 5 million copies it needs all of the above!

Feed stations, registration mylars, feed tyres, torque limiters, bypass feed clutch, possibly the vertical transport motor that sits between trays 1 and 2 too.

I had one go on me, spilled a good amount of dev over the feed stations, kaputski. 1.7mil on the clock too...

[Ollie1981]

Another goody is the torque limiters in the feed sections. As fast as they are I have had problems with these that didn't cause a timing issue till the paper got round to the duplexer exit..

Here's a thought. Is this all during duplexing jobs? You can turn off the inverter and run and see if you get jams elsewhere.

Haha yeah, I had lots of fun recently with an Aficio 700 that needed new clutches on two out of three feed stations, on the relay, new torque limiters on all trays, new registration and duplex transport clutches before it would stop chronically jamming.

All I can say is it was a damn good job that it was far too big and heavy to throw out of the window.

For the person who mentioned clutches, there is a clutch on the duplex unit, but in a massive improvement over the 551/700 they put motors on all feed stations instead of clutches.

[neilt69]

clutches can be a cause especially at 4mil within 2-3mil duplex clutch i changed once same with the inverter rubber rollers in the fuser exit going to the duplex section...Tonermunkeh seems tobe right

[Lagonda]

I would be checking the operation of the interchange gate beween the fuser exit and the duplex feed in. Had no end of trouble with one until I noticed the return spring was missing and the gate just didn't quite get to its home position quick enough.

[nastech]

Thankx for all the feedback it does need alot of attention besides the regular PM parts but i have set the machine aside as i feel its not worth been put back into use...

[paulg]

I would be checking the operation of the interchange gate beween the fuser exit and the duplex feed in. Had no end of trouble with one until I noticed the return spring was missing and the gate just didn't quite get to its home position quick enough.

I 2nd that and a touch of oill at each end stops it squeaking.

move the gate as you inspect it if it squeaks a tiny dab of mineral oil has along with a good service stoped jams. Also clean up the paper exit rollers and check the guides in this section as well.

I also would say go back to the trays and feeds. A machine only this week was jamming in the duplex cleaned up the duplex and checked it over still jamming. Cleaned up the paper feed and reg unit and duplex return rollers and wiping clean all the sensors. Still jamming changed the feed tyres and torques and problem gone.