Failing to print very large files

I've got an iMac running the newest Leopard, printing to a network printer. Printing usually works without incident. However, when printing large documents -- say a 20-40MB PowerPoint presentation with lots of color -- I receive the following message after 10-20 minutes of waiting:
/usr/libexec/cups/backend/socket failed
The printer is an HP Color LaserJet 8550DN with 96MB RAM and a 3.1GB internal HD.
When printing large documents to this printer, printing seems to proceed correctly (if slowly) before reaching the inevitable error message.
Possible causes would seem to be
--too large a print job for the printer (though lpq suggests that many of the jobs that failed were <50MB). There was no other network printing taking place on this printer when the jobs failed.
--some kind of timeout issue. How is the timeout value set? It doesn't appear to be in /etc/cups/cupsd.conf, at least at the moment.
Any other suggestions appreciated.
Thanks.

This info relates directly only to an Epson 9800. However, it may have applications elsewhere.
Generally, the print spooler in the 9800 with Photoshop will not print large files (>100 mb or so) unless you first convert them to the printer profile and shut down and restart the Mac and then print the converted image. This is true for Tiger and Leopard. In addition Leopard takes about twice as long to spool and since I print lots of 500 mb files, I have given up and gone back to Tiger (lots of other reasons also).

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