Black lines on MPC2800

[brodera]

These lines appears only when you do Duplex from ADF and from the scanner glas. But only on the rear side.

What can it be?
I have clean the scanner glas and CCD lens and those moving mirrors in the scanner.

BEST REGARDS!

[rsyarcia]

have you checked and cleaned the exposure glass guide on the adf? maybe there are scratches. it should plain white. And check for the margin adjustments. just an idea.tnx

[Jomama46]

Go into user tools>copier settings and change the duplex margin to 0

[brodera]

Go into user tools>copier settings and change the duplex margin to 0

Yeah i have done that but still the same problem. I sent out an another tech to see if he can find the problem, I stare at that problem for like 2 Hours lol.

Thanks for fast replys!

Ill let you know if he solve the problem.

[ucinn]

I would say paper registration adjustment in the SP modes for duplex (2nd side)

[jonezy999]

it looks like 1-2 sided duplex margin. its always set to 5mm from factory.

[Jomama46]

is there an echo in the room?

[jonezy999]

echo in the room, the room.......

[NeoMatrix]

in the room ... room

[NeoMatrix]

(Hi Sorry about the echo in the room, funny as though...

Ok being serious...
On zooming your attached PDF image you posted, I see a two rows off whats best described
as morse code dots down the centre of the copy. Assuming A4 SEF (Short Edge First). Not A4R (LEF)
If its the dots you are taking about, then its interesting, because I can't determine if its periodic. I will have to print the attached image out and have a look closer. Nothing comes to mind except charge roller or the charge roller cleaner is badly deteriorating and foam is layered on the charge roller. Or a piece of paper or staple has gone into the drum and/or blade area.

HTH
GDM

[Prodigal Son]

I'm the senior tech he was talking about... And I've been digging deep in this. It turns out our showroom machine (though an MPC4000) does the exact same thing.

First of all - prints are perfect, this is no mechanical error. Normal copies are fine, it's only duplex copies that are weird - and only the backside. As some of you have suggested, the first thing I did was to go into copier settings > edit and set 1-2 sided duplex margin to 0. Strangly enough, this does not have any effect at all. I even tried setting it to 30mm just to see what happens but there is still no visible change what so ever which clearly indicates an error of some sort.

I've gone through the usual leading edge registration adjustment (SP1001, SP4010) and also checked sub scan magnification, side to side reg, etc. And as I said - singlesided copies are perfect. Duplex copies are also perfect but only on the front page. On the rear this line always shows, and of course it is the originals paper edge that shows because the image is being moved way to the left. There is a perfect example of this attached...

One other thing I think is rather odd... When scanning (to mail) the same original with duplex setting, there is no movement of the image. They look perfect. So it actually looks as though the scanner is working as it should, which suggests the problem lies in how the machine utilizes the scanned image to make a copy. Again, this points to the 1-2 sided duplex margin. And the fact that nothing happens when I change it's value makes me suspect there is a firmware issue.

Therefore I updated all the firmware to the latest one I could find on Tessa. I even updated the ones that were the same version, just to overwrite any bad firmware in case that could happen. So the entire firmware is updated. Still no progress...

To quote Tuvok from Star Trek Voyager... "Logic can never be flawed" - but where the hell is the logic in this?

[NeoMatrix]

If you done every thing else it sounds like the RDF (Doc Feeder) is lagging ?
Is this a single image copied double side off the glass (Platen)?
I had some R/ADF drive mag-clutchs bind up on brand new machines and lag/drag causing p/j's.

Causing hair pulling out fustration....

HTH
GDM

[Prodigal Son]

Is this a single image copied double side off the glass (Platen)?

Yes exactly. I've only concentrated in copying from the glass and not the document feeder, so far. Figured it's best to get it right from the glass first and go from there. And to make sure I don't accidently move the paper, I've let it stay on the glass and just copied the same image twice, just as you said.

[E Winter]

Have you checked if the machine is shifting the backside in PRINTING mode as well?
I'd also recommend to printout the non-default SMC page and check if there's any suspicios SP setting. You can also scan and post the page so we can take a look as well.

You can also backup the NV-Ram data via SD card and perform an engine reset, try a test run again and restore the nvram data with your backup. I've seen problems disappearing even if it's not logical if you copy this 1:1 backup into the machine.

[Prodigal Son]

Have you checked if the machine is shifting the backside in PRINTING mode as well?
I'd also recommend to printout the non-default SMC page and check if there's any suspicios SP setting. You can also scan and post the page so we can take a look as well.

You can also backup the NV-Ram data via SD card and perform an engine reset, try a test run again and restore the nvram data with your backup. I've seen problems disappearing even if it's not logical if you copy this 1:1 backup into the machine.

Yes, prints are not a problem. I've also compared the non-default SMC to the factory mode setting list and tried to change everything back to factory settings. Still the same though.

Remember there are two seperate machines, the MPC2800 at the customers and our showroom MPC4000, acts exactly the same. To reset NVRAM is a good idea, I think I'll try that this afternoon.