MP 2550 Mystery Jam

[rthonpm]

I've got a customer with a fairly new 2550 that's giving them a persistent lag jam at the junction gate sensor (code 065) after the machine runs for a little while.
I took out the fuser and inverter unit and everything looked good, but it seems like it comes back with a vengeance every few weeks. By the time I'm able to get there the machine is fine.
I've seen a couple of strange jams on this model, but nothing that can account for this.
Any ideas would be appreciated...

[E Winter]

I have no specifiv idea but does this happen during a duplex job? Does the paper "crash" or stop inside the machine without any damage?

[Star]

Firmware up to snuff?

[rthonpm]

Firmware is the latest and greatest. I have yet to see the machine jam myself, even running over 200+ pages at a time for testing... I will be starting my day there when they next run their big job.
If I find anything I will share properly...

[leo34staffs]

check the discharge grid (does this machine have one?) if the power pack fails for the discharge grid you will get jams like you mention on duplex jobs, as after a while theres no discharge for the paper and static charge bulids up, this can cause odd jams like this. (especially on duplex)

[rthonpm]

Thanks Leo...

I think I've narrowed down to the sep pad for tray one. Having finally seen the machine jam, it seems that it chain feeds: there was a page past the drum with an inverter jam but there is no image on the paper. The pad is one of the plastic type as opposed to the cork pads that just seem to hold up better.

[rthonpm]

I finally got an answer on this one: it's a firmware error with the resolution still in production. It is supposed to be released soon....

[Cipher]

I think I could have a similar issue with a MP2550 30k on the clock.

Non feed jams being logged for Tray 1, A4 LEF and jam code 57 (reg late) shown as the latest plotter jams.
Customer says they remove two sheets from the reg area every time it happens.
But sure enough when I'm onsite I cannot recreate the problem, it works fine for hundreds of copies.

Strange one.

[rthonpm]

Cipher, that sounds a lot like my issue as well: double sheet feeding and such. I have yet to see firmware for this issue come out and I have one customer still having repeated issues with this jam. Maybe the speed is too great for a non-FFR feed system?

[TonerMunkeh]

Watch these buggers, they're a good one for throwing up really wierd jams.

A good one I've seen is where the side fence position sensor gets knocked out of place by customers pushing the tray back in with a little too much force. It'll present faults such as the machine detecting A5LEF with A4LEF in the tray, A4LEF with A4SEF in the tray. This is while the machine is on Auto Detect. When the tray is set to a certain paper type in User Tools, it will just continually jam out of the tray.

[Cipher]

I've reset the jam counters and asked the customer just to use tray 2 for their A4 LEF for a few days.
I just want to see if they get the same issues using a different tray source.

A non-feed would suggest the bottom plate pressure may not always be sufficent or the feed clutch is failing to engage intermittenly.
But as I cannot recreate the problem it's not easy to get a picture of what is actually happening.

If I make any progress on this one I'll be sure to let you know.

[iMind]

[KopyKat]

Had a non-feed problem in tray 1. Trial and error with the settings in the attached file (SP 1908) for the pressure plate adjustment and it did the trick for me.

Might be worth a shot. I highlighted the SP Modes.

[largo]

yep, like tonermunkeh says:

at the rear of the machine the sensor pops out of the little chasis

then if your machine is set in usermode on auto detect paper,

than the machine gives an other paper format and also sometimes add paper when there is still some paper in the tray left

I would check first this option because i had a lot of this problem

greetz

[Cipher]

Had a non-feed problem in tray 1. Trial and error with the settings in the attached file (SP 1908) for the pressure plate adjustment and it did the trick for me.

Might be worth a shot. I highlighted the SP Modes.

I went back a few days ago and reduced the tray lift reverse time on all the fill levels for tray 1 A4 LEF.
The default values had worked fine for the first 30k of the machines life so I'm hoping only a minor pressure adjustment is required.

SP1908-005 -100 (100%)
SP1908-006 -100 (70%)
SP1908-007 -100 (30%)
SP1908-008 -150 (10%)

Fingers crossed.