Di350 duplex

[stacyrf]

I have a problem with several of my di350 and di250 models on duplexing. when the machine duplexes more then one copy of the original the machine will jam at the exit of the fuser. the paper will come out of the fuser after fusing side one and start to return back into the machine to be flipped to copy side 2 but only goes in about 2 inches then is pushed back out of the fuser resulting in a paper jam since that paper never reaches the sensor in the duplexer. I have spoken to several people at minolta and none of them have ever heard of this problem. I have at least 6 machines if not more doing this exact same thing. the jam does not occur every time (the dreaded intermittant word) but does so often enough for me to duplicate the problem on a visit. anyone else seen this or have a solution? I've tried new fuser, new duplexer, new bypass (since it's used in the duplex process), new control boards. I just don't think these copiers like it here in my town.

[mtech]

Sorry, but I work on these and they just don't like it anywhere. I have not seen this. I have seen duplex units cracked by slamming the door. Do you think it is a logic problem rather than mechanical? Try reflashing the machine? God help you!

[MinoltaManager]

I have at least 250 of these in the field and have never seen this one!

Check that the paper is showing the correct size on the display and reinstall the firmware. Good luck! I will ask my techs at our next service meeting if any have run into this one and if so, I will post your answer here.

[nmfaxman]

Make sure the screws attaching the duplexer to the machine are tight.
Also check the support brackets are set right.
The duplexor has to be flush with the side of the machine.

[Elle]

wow that sounds exactly like a problem i just had on a NEC IT3530D - i was lost with it. this machine was also scoring the drum at the rear side so the plan was to fix the duplexing problem first (i had clutches on order and a switchback sensor in hand) so i cleaned the clutches as best as i could and replaced the switchback sensor but the problem remained, i did find that the captured screw at the bottom of the gear cover on the duplex was missing so i replaced that too to no avail. after all of that i decided it was time to at least fix the drum problem for clean copy single sided. new drum, new dev unit, new developer. i closed it all up and it made great single sided copies - i tried duplexing one more time and much to my amazement it worked. inspecting the dev unit revealed a missing mylar to match the scoring on the drum also a considerable amount of arcing was evident - we still dont know why the dev unit made that much difference with duplexing and guessing just left us with possible latent charge in the copies and thats still our best guess. anyways i know its not quite the same machine but maybe this will help some. good luck

[fixthecopier]

I have had tons of these machines in the field and lots of duplexer problems. I think KM tech support is made up of people who have never worked in the field and just read out of the manuals that we have. The duplexer on 250/350 and 251/351 work the same. If the drive motor on the duplexer gets weak you will have trouble. A weak motor will even cause problems doing single side copies. Take the duplexer off of a good working machine, swap and see if problem goes away. If it does then change the top motor on the duplexer. If trouble stays then swap the fuser. If that fixes it look at the exit rollers on the fuser. It's rare but sometimes they can cause trouble. Hope this helps.

[fixthecopier]

Sorry, its morning and I didn't read all the way down to see that you traded out those parts. Lets try the big stuff. Swap the main drive motor for the machine, it's not that hard. If that does not get it, then swap the MFB from a working machine, that is where your firmware is. Good luck!

[stacyrf]

well like I said, I have at least half a dozen that do this. I would suspect that I have many more but I am thinking that alot of my customers simply do not do duplex copies, or do the occasional 1 or 2 duplex copies so they do not notice this problem. like everyone else I have many of these copiers in the field, probably around 100 or so. I have swapped out the duplexer, fuser, bypass, mfb board with known good units. This happens when no finisher is present so I ruled out the horizontal transport. still baffled that no one else that I talk to experiences this problem, especially those of you with 200 something of these units in field. quite possible that your customers don't do alot of duplexer as well I guess.

[fixthecopier]

Sorry, but I have never fought that one. By chance would you have noticed if the text on any of the copies in the machine when it stops, is off center. Could a clutch slipping be throwing the timing off?

[stacyrf]

no the copies are normal looking, nothing out of the ordinary.