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

[Helge Blischke]

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