Konica-Minolta 4750en crashed using CUPS 1.52 but not 1.50

[Mark Blades]

> Mark Blades wrote:
>
> >> Mark Blades wrote:
> >>
> >> > Hi
> >> >
> >> > I just updates my Ubuntu desktop to 12.04 (fresh install rather than
> >> > upgrade).  ON reinstalling my printers from the cups web interface I
> >> > found that the 4750en although found and installed by CUPS using the
> >> > same ppd file (from K-M support site) any job sent to the printer from
> >> > cups 1.52 hangs the printer (flashing processing light and the printers
> >> > web
> >> > interface becomes unreachable).  I have tried installing as a
> >> > jet/direct
> >> > or ipp printer to no avail.  Also tried installing via USB with the
> >> > smae results.
> >> >
> >> > I have a laptop with cups 1.50 (on ubuntu 11.10) installed and this
> >> > prints fine over ethernet using either jet/direct or ipp protocols.
> >> >
> >> > I am currently trying to find a way to print to file from the 2 cups
> >> > versions so that I can compare the PS output for any clues but can't
> >> > see a way to do that? If the problem is malformed postscript can I send
> >> > a .pdf to the printer from the shell to bypass the interpreter?
> >> >
> >> > any help much appreciated
> >> >
> >> > Mark
> >>
> >> To save the final data sent to the printer, you may do the following:
> >> (1) shut down cups
> >> (2) save the file /etc/cups/printers.conf for safety
> >> (3) for the printer in question, change the DeviceURI line to
> >>     DeviceURI file:///absolute_path_to_destination_file
> >> (4) make the directory where the destination file should be written to
> >>     world wrietable
> >> (5) start cups
> >> (6) make a test print using the same source that caused the problem
> >> (7) shut down cups
> >> (8) restore the original DeviceURI for the printer in question in
> >>     /etc/cups/printers.conf
> >> (9) start cups
> >> (10) post (an URL to) the saved sample files.
> >>
> >> Note that steps 2,3, and 8 must be done as root (or via sudo command).
> >>
> >> Helge
> >>
> >>
> >
> > Hmm, Thought I posted a reply to you but I'll try again.
> >
> > Thanks for the instructions.  The output from cups 1.50, cups 1.52 & the
> > .odt file used to create the output are at the following url.
> >
> > https://sites.google.com/site/kmcupstest/
> >
> > thanks in advance
> >
> > Mark
>
> I modified the cups1-52_fail.txt by decompessing the compressed prologue
> part of the file, as my suspicion is that the printer's PS interpreter
> cannot execute LZW (de)compression, as for a long time there was some
> uncertainty about the LZW decompression (as the compression was covered by a
> patent until, I think, 2000 or so).
> Please download the file from this URL:
>
> http://www.file-upload.net/download-4322578/cups1-52_t1.ps.html
>
> and feed it to your printer as a raw job with the command
>
> lp -d your_printer -o raw cups1-52_t1.ps
>
> and let me know if it works.
>
> Helge
>
>
>
Hi,

Feeding the printer the raw file had the same effect as printing from office. the printer hangs on processing the file and cups reports the job as complete. I also tried using the same command with the 1-50-success file and this printed out OK.

thanks again