Sproadically incomplete prints from Lexmark MS 521

[i-have-no-clue]

Hello fellow technicians,

3 weeks ago I've replaced an old HP Laserjet 4250 with a Lexmark MS521 at a customer.
They print their delivery documents and so on from a software running on a unix system.
It's not so easy to change drivers there (at least for me). As far as I have encountered yet the Lexmark printers
just work fine with the HP drivers, so I've decided not to touch the printer driver and it seemed to be ok.
But now sometimes the printed page is incomplete, meaning letters (within one word for example) or words are missing or sometimes only the first inch
on the top of the page is printed the remaining page is blank.
The error seems to occur only when a bunch of pages, say 50, 100 or 200 is printed. Then you could have one or two pages
with the error in between. If you reprint the faulty pages all is correct. So you can't reproduce the problem.

It seems to me this has something to do with data loss and not a driver problem. But why. The HP had been working for years.
What can I do (besides installing newest firmware)? I've tried to set the ethernet connection speed of the printer from 1000 Mbit
to 100 Mbit (because I know this from other brands, that this could help with such strange errors). But I can't find such and setting option here.
Where can I do this?
I've replaced the old ethernet cable from the old printer with a new one. And I've deactived "Energy efficient network" in the printer menu.

Does anyone know such problems? I don't think that it's a hardware error within the printer. It would be the first one of hundreds. (ok...)
What else could I do?

Thank you.

[mloudy]

Re: Sproadically incomplete prints from Lexmark MS 521

I would say it is a print driver issue. Dropping a letter in a word is weird.

Not sure if this is how you would "set the ethernet connection speed"??
Enter the Service Engineer (SE) menu, and then touch Network SE
Top level menu, MAC, Intermediate menu, Set Card Speed

[tsbservice]

Re: Sproadically incomplete prints from Lexmark MS 521

I would say it is a print driver issue. Dropping a letter in a word is weird.

Not sure if this is how you would "set the ethernet connection speed"??
Enter the Service Engineer (SE) menu, and then touch Network SE
Top level menu, MAC, Intermediate menu, Set Card Speed

+1 on wrong print drivers. I think machine NIC speed has nothing to do with this problem.

[Lance15]

Re: Sproadically incomplete prints from Lexmark MS 521

Why was the 4250 replaced with a Lexmark to begin with????

The 4250's are workhorses and very easy to repair and fast for printing high volume.

I'm speaking here with no experience of Unix systems, but, I think these systems can be very particular with the driver being used.

[i-have-no-clue]

Re: Sproadically incomplete prints from Lexmark MS 521

Thank you,

so I've realized that under Unix/Linux you are printing with CUPS which is postscript. I don't know the exact Unix OS the customer uses.
Sorry I didn't mention it's actually an Konica-Minolta 4402P Printer which is in fact a Lexmark MS521, I thought there are more people which
have experience with Lexmark.
But Konica-Minolta has only the PPD for Linux-Systems. Can the PPD be used on all UNIX systems?
You know, you can change the standard emulation from PCL to PS in the printer settings. Could it help, when I change it from PCL to PS.
Or the admin must use a driver from the lexmark page. There are more unix drivers.
To Lance 15:
The HP was broken and repair too expensive.