[Jamming] double-sided

[decacazza]

hello i have a problem with a ricoh mpc 3350: double-sided sheets come out wrinkled
thanks

[ruben]

Re: double-sided

What have you tried so far?

[decacazza]

Re: double-sided

I tried to fix joggers drawer and check the paper path all seems ok.
it does not happen always, but quite frequently
the defect occurs ol in front and back.
from 2 drawer seems to happen.
thanks

[Eric1968]

Re: double-sided

You will first have to know where the wrinkling occurs. The Fusing Unit can be the cause, or maybe the paper isn't fed properly. Open one of the covers during printing to see where the wrinkling happens.

[Herostrat]

Re: double-sided

This is just guessing but I'd say it wrinkles after it comes out of the fuser for the second time,otherwise it wuldn't come out of machine at all.
Perhaps it isn't guided out propper,check out for anything off in gudes after the fuser,try diferent paper.
It culd be high humidity on paper.

[teebee1234]

Re: double-sided

Well, I can tell you our office has been experiencing this on almost all of the new mp3353 model and the problem may be the same as your issue. The ribs on the gate pawl at the top of the duplex module are molded with a rough texture, maybe yours has the same problem or a nick in it. What's happening is when the pawl actuates to divert the first printed side to go above the exit assy before reversing direction, the lead edge of the paper is striking the rough surface of the ribs and either bending the corner or the paper ripples. Removing the pawl and smoothing the surface with scotch brite or emory cloth has solved the problem. Also check that the tabs that the pawl hinge pins go into are not too tight against the ends. This has happened on a few and prevents the pawl from fully actuating, just bend them apart slightly.

*I've compared the pawls on the new models to the old and there is a definite difference in texture. Maybe a different material, manufacturer or finishing defect. I have informed tech support but I don't know that they have received enough complaints yet to issue a bulletin.

[Cipher]

Re: double-sided

• Check the pressure roller springs are located in the same notch either side or the pressure will be lob sided.
• Check the plastic on the lower fuser frame has not collapsed under the hot roller bearing(s) or the pressure will be lob sided.

[decacazza]

Re: double-sided

Thank you all for the help I do the tests and then write the result hello

[pppp]

Re: double-sided

Dear All,
In Poland we have noticed epidemic paper wrinkling on MP3353 whilst duplex printing. At the moment we are testing entire Gate assembly (I mean Gate assembly including D3694677 part) taken from older MP2851.
Like someone said earlier, new Gate assembly looks poor and cheap. So, it seems good solution to use older assembly.

BTW. It looks that wrinkling is strictly depending on paper moisture and poor quality of mensioned above assembly


10 points go to Ricoh...

[Smee]

Re: double-sided

I dont want to hijack this thread, but it sounds very similar - maybe the same problem - as posted in this thread I started - http://www.copytechnet.com/forums/ri...ing-paper.html

All these black and white machines, right from the original MP2550 have crinkled paper and I have NEVER found the one definate cause for it. Are you sure its only doublesided that you get this problem? My gut feeling, thru seeing it many times is that its a coincidence you only see it double sided. Test it more and I figure it'll happen single sided too...

Ive replaced fusers, tray doors, paper, even entire duplex doors trying to fix this but the only time ive ever been sure ive fixed it was with a new PTR assy fitted - not just the roller but the entire assy.

I introduced the fault when I took it off a perfectly working machine, then refitted it and it crinkled straight away. I played around with it for a while, couldnt see or work out what I'd adjusted, then gave up and replaced the whole thing in disgust! I think it was a slight adjustment or play in the screws or hinges holding it on that caused it but I never got to the bottom of it ( think a micron of a gnats cock here....)

Check out the link above - lotsa good ideas to try! But id love to hear the fix too.

[Mark Bbb]

Re: double-sided

I dont want to hijack this thread, but it sounds very similar - maybe the same problem - as posted in this thread I started - http://www.copytechnet.com/forums/ri...ing-paper.html

All these black and white machines, right from the original MP2550 have crinkled paper and I have NEVER found the one definate cause for it. Are you sure its only doublesided that you get this problem? My gut feeling, thru seeing it many times is that its a coincidence you only see it double sided. Test it more and I figure it'll happen single sided too...

Ive replaced fusers, tray doors, paper, even entire duplex doors trying to fix this but the only time ive ever been sure ive fixed it was with a new PTR assy fitted - not just the roller but the entire assy.

I introduced the fault when I took it off a perfectly working machine, then refitted it and it crinkled straight away. I played around with it for a while, couldnt see or work out what I'd adjusted, then gave up and replaced the whole thing in disgust! I think it was a slight adjustment or play in the screws or hinges holding it on that caused it but I never got to the bottom of it ( think a micron of a gnats cock here....)

Check out the link above - lotsa good ideas to try! But id love to hear the fix too.

At last... someone with the same problem, i was begining to think i was the only one on this planet (with this problem, i mean)... Jams on second side on nr 26 (smc), wrinkeled between the junction gate pawl and the exit of the F.U. I have had this problem now for years, it comes and go's on al models. It is my impression that it is starting every time after a replacement of the pcu (type pcu 1027). This is in fact not the original pcu for this model, and i'm wondering if that can be the cause? I would be so greatfull if anyone would help me out, here! Thanks a lot in advance. greetins, Mark.

[Counsel]

Re: double-sided

If this is the one im thinking of that has the fuser that looks like the older 3025 machines with the exception they added the levers to the fuser for the door to push on and add pressure to the lower roller. Then the cause is the bottom entrance guide to the fuser. If you flip the fuser over there is an entance guide plate with 2 screws holding it on kind of slips off with a metal grounding plate on the rear side. On this guide plate you will see right in the middle two nubs usually slightly worn down. Get a file or sand paper remove the guide plate and sand the nubs smooth then try.

Usually see this happen on duplexed or paper run SEF or more so with legal 8.5x14 SEF single sided I have always just sanded the nubs to smooth with the rest of the guide and wrinkle is gone, you can if like just replace the part but sanding works just as well.

[Mark Bbb]

Re: double-sided

Dear Counsel,
i will try this out at wensday, at my next visit to this client.
I thank you very much for your reply, i let you know if it's ok or not.
Good luck with your business,
Mark

[Counsel]

Re: double-sided

Hope it helps, this is usually what causes SEF to *wrinkle in the middle of the sheet usually it does exit and just looks like it got mashed in the middle and ironed in that way. As for jamming I don't see it do that as often unless it wrinkles first time through and doesn't feed on the second side properly through the duplex. There were some other things people used to mention one could be the pcu shutter not opening as far as it should sometimes it jumps gear position and wont flip completely back you can remove the shutter in this instance. Another on the older models was if it happened from a certain tray the foam guide roller right at the trays exit might have a chunk missing in it which can catch paper as it travels out of the tray. If your jams are in the fuser directly and are crumpled inside of the fuser rollers make sure the door is properly engaging the pressure levers on the fuser sometimes the rear side does not engage or the bearing on the lower fuser roller the side with the spring on it gets stuck and the lever will not push it to get pressure evenly across the hot roller this usually causes toner to not fuser or paper to slip and skew in the fuser.

A lot of these ones with the levers I swapped out for the older 3025 models the ones with just the springs insides to maintain fusing pressure, I got tired of people breaking the levers or shutting the door improperly sometimes the rear side of the door was not shut at all. Its the same fuser just without the levers on it.

Good Luck and let me know how it goes.