[Jamming] SR790 Jamming on MP3351SP

[df3036]

Anyone been having jams that seem to roll into the staple stack. See attached. I stopped the machine in this pic otherwise it will keep going. R5 was pulled back after to see it better. Paper has very little curl. Always seems to be the front. 38K on MP3351SP. If you let it continue it will keep ramming them in, try to staple, and code or jam when the belt tries to lift this mess out... I have taken all the guides in the area out to check for burrs etc. Almost everything they do is stapled. when it does jam there are around 15 pages for the customer to take out. I have 2 exact machines doing the same thing. Any ideas? Dave

IMG-20120403-00130.jpg

[Gift]

Re: SR790 Jamming on MP3351SP

I bare recall having a bad mylar somewhere in the stapler area causing such kind of trouble - unfortunately I don't remember the exact location but it was a bit hard to discover. On the other hand: The MP3351 is quite a new model and I had this on some old SR790 with lot's of staple tasks on the clock. In case your SR790 is way older than the machine (sometimes salesdudes thinks they can re-use options of a former machine^^) the firmware might be too old to keeo the finisher compatible with new MFPs. But in this case the issue should be there since the installation date, so it's probably not your problem.

[df3036]

Re: SR790 Jamming on MP3351SP

Both machine and finisher installed new a few months ago. Firmware is up to date. Have had that before. As far as the mylars in the stapler, the paper is already rolling before getting to the stapler. Good thought.

[nmfaxman]

Re: SR790 Jamming on MP3351SP

I have seen the sponge roller(seen in picture) not turning cause the paper to not lay flat as it feeds into the staple tray, and the eject belt slip off the tension roller throwing off the timing.
Have you cheated the door and watched it jam?

[df3036]

Re: SR790 Jamming on MP3351SP

I have seen the jam happen a few times. I have watched with the door open for a couple of thousand copies. It does start rolling over before the sponge roller drops. These sponge rollers are driver by a ribbed belt and are hard to stop unlike the older plain rubber band of yesteryear. Dave

[Gift]

Re: SR790 Jamming on MP3351SP

Maybe it's just a peper quality/moisture problem then? How does the paper generally looks like after copy process? Maybe it's quite "pre rolled" - bad condition for further finishing.

[df3036]

Re: SR790 Jamming on MP3351SP

That's what I think too but the paper is not curled much at all. It is kept in a dry location and the humidity is not that high here yet. Two different brands of paper and not the no name crap. One is our house brand from another vendor. I am guessing it will only get worse. We have hundreds of these in the field and see see this jamming once and a while but not as regular as this. A lot of what they do is stapled though. We have tried modifying the guide under R4 by extending some mylars to get the paper in further before it has a chance to curl. That is the last thing we have done. Another thing we tried was shaving the ribs off the ends, suggested from a different tech.

[ucinn]

Re: SR790 Jamming on MP3351SP

That's what I think too but the paper is not curled much at all. It is kept in a dry location and the humidity is not that high here yet. Two different brands of paper and not the no name crap. One is our house brand from another vendor. I am guessing it will only get worse. We have hundreds of these in the field and see see this jamming once and a while but not as regular as this. A lot of what they do is stapled though. We have tried modifying the guide under R4 by extending some mylars to get the paper in further before it has a chance to curl. That is the last thing we have done. Another thing we tried was shaving the ribs off the ends, suggested from a different tech.

It doesn't take much curl at all to make these things roll up and jam. When watching it, see if the front corner of the paper gets stuck on the front black roller of the exit rollers or the staple tray entry rollers. I have had a few do this. What I do to fix is remove those white flaps on that exit J guide..the one you can move that's spring loaded. I also take that roller and remove the two black end rollers and replace them with some Minolta rollers..ever since doing those two things, I've never had the problem again.

If that is what is happening to yours, then I can give you part #'s and pics.

[df3036]

Re: SR790 Jamming on MP3351SP

Is this for part number:
B408 2251 Stapler Exit Roller
Section 6 Item 11 from the B408 parts manual?

Are you installing larger or smaller diameter rollers? Are you just breaking off the old black hard plastic ones?
We were looking at this too but went for extending some mylars past where the guide ends to get the paper further so it did not have a chance to curl. They have now called back, yet. It does happen pretty quick and it is a busy office that I would rather not bug too much more than I already have. We have some extra units here we are modifying and taking over. We used to be a Minolta dealer at one point, but if you happen to have a pic, I can see if we have something similar from the ridiculous number of other machines we service...
Thanks

[ucinn]

Re: SR790 Jamming on MP3351SP

Is this for part number:
B408 2251 Stapler Exit Roller
Section 6 Item 11 from the B408 parts manual?

Are you installing larger or smaller diameter rollers? Are you just breaking off the old black hard plastic ones?
We were looking at this too but went for extending some mylars past where the guide ends to get the paper further so it did not have a chance to curl. They have now called back, yet. It does happen pretty quick and it is a busy office that I would rather not bug too much more than I already have. We have some extra units here we are modifying and taking over. We used to be a Minolta dealer at one point, but if you happen to have a pic, I can see if we have something similar from the ridiculous number of other machines we service...
Thanks

Yes, that is the roller I adapt. I also remove the trailing edge guides(4 of them) item 15 of section 6. I use the small flappers from minolta part#4643520101 I took a picture from the back so you can see what direction they go on the shaft. Since I've put these on my trouble machines, I have not had them have staple problems since. The only side effect is a little more noise as those flappers hit against the guide, but my customers don't mind it since it's working. Take off the two end black rollers, just grab them tight and you can twist them off the ends of the shaft, replace them with the flappers and you are set to go.

[ucinn]

Re: SR790 Jamming on MP3351SP

Yes, that is the roller I adapt. I also remove the trailing edge guides(4 of them) item 15 of section 6. I use the small flappers from minolta part#4643520101 I took a picture from the back so you can see what direction they go on the shaft. Since I've put these on my trouble machines, I have not had them have staple problems since. The only side effect is a little more noise as those flappers hit against the guide, but my customers don't mind it since it's working. Take off the two end black rollers, just grab them tight and you can twist them off the ends of the shaft, replace them with the flappers and you are set to go.

I forgot to mention, that minolta part has enough flappers to do two sorters, use the smaller flappers, it can do even more if you trim down the larger flappers.

[df3036]

Re: SR790 Jamming on MP3351SP

That is nice.... A picture is worth a thousand words.
Thanks, will look into it.

[Polarbear]

Re: SR790 Jamming on MP3351SP

Do you know if that customer uses short or long grain paper? Short grain in the short edge feed direction is more prone to curling.