FW 870 paper JAM

[Guest]

Hi, I have specific paper jam on FW870 wide format copier. I enclose two pictures for example if somebody has the same problem. I change rollers, el. mag.clutches, paper feed senzors and stap motor of paper feed. I suspect a problem with cut sinhronizatio and measured original lenght? I'm not shure and I asked if you have similar problem with this copier.

THNX

Bostjan SLO

[schooltech]

Great pictures. Now, if only others could post pics like that....

I am not familiar with this model, BUT it looks as though there should be a sensor that needs to change state to tell the in-feed rollers to begin. It looks like the in-feed rollers aren't turning at the right time, and it may be sensor related. I see that there is a cutout in the center of the frame for what looks like a photointerrupter. And, are you absolutely certain that there no obstructions, bent metal, or any type of little burr or something catching the paper? Just to double check, that's all.

I'm leaning towards a flaky sensor, given my lack of knowledge on this model. Even though you said you changed the sensor(s), is the wiring sound? If you can do an input check with the sensors and make sure when you change state that the bit switch changes state as well. At least that way, you'll absolutely know that the sensor is telling the machine that it is working properly and sending the proper info to the boards.

[Rorschach]

I agree. Great pictures.

It's been a while since I've worked on one of these beasts, but you may want to try a few things...

When you load a new roll of paper (or a used one, for that matter), does the lead edge of the roll feed to the roll lead edge sensor before retracting to the paper feed start position?

How about roll 2; does it feed properly, without jamming like this? Take roll 1 out, and try to use the wide format with just roll 2. The reason I ask this is because the two rolls follow separate paths in the roll unit, and these paths don't meet up until about 120mm before the cutter. If roll two feeds correctly, then you probably have something blocking the paper path from roll 1, like the above poster indicated. A burr, or scrap piece of paper would certainly do the trick.

Also, take a look at the roll feed roller assembly, just above the cutter. It's driven by a series of gears, about three of them, and if the gears don't mesh properly, the roll jams. This would apply if the problem occurs from each roll, not just the first one.

For the output check that was suggested, the roll lead edge sensor is program 10. This is the only sensor in the feed unit that, as I recall, doesn't indicate a roll end condition. But this sensor is located near the roll feed roller assembly, not at the beginning of the paper path by the roll.

[The-Peanut]

i've had this b4

when the paper roll drawer is shut, the gears from the door mesh with the drive gears from the main machine, they dont quite join well enough causing this problem, they r located on the left hand side of the machine

the paper drawer can be adjusted to solve the problem

also it can be caused by the sensor that is located under the dev unit (PJ81)

try testing the bypass and see if it works from there

[bostjanma]

I give you some more informations:
1. The problem is the same from the both roll feeders!
2. I'm shure that is NO obstructions on the paper way.
3. If I do one by one copy the copier works ok.
4. If I work multiple copy first I have diference between the original size and copy size?! After that (3-5 copy) the jam appear.
5. The gears between the copier and paper feed unit looks in good conditions.

What do you thing about original lenght senzor? Probably I have the problem in this part but I'm not shure?

[trc]

saw the same thing....unfortunately in my case it wsa the main board...a fried ic.....

[copytec]

The problem is in AJ03 0006 Cutter Unit . The cutter roller have alocations in his house. Get out catter unit, clean and put some greas on Al. house whear cutter roller going.I have the same problem only from the 2 roll feed, and the problem is the simple,
but 2-3 hours you mast lose.

[bostjanma]

In my case The cuter is not a problem I replaced with new one and the problem I did'n save! Most probably the problem is on a Main Board?!

THNX

[Guest]

Make sure the rollers above the cutter unit can turn freely. If they are hard to turn then you can take the whole assy. apart and clean all the bushings and make sure the tension rollers turn well. This can cause the problem you are describing.

[The-Peanut]

Was this fault ever solved?

if so how

Cheers