This is not a print spooler issue, I get the same problems feeding the printer by hand with netcat. The document that's immediately a problem is pdfTeX output, but I've also had these problems with printing from Firefox, Inkscape, and OpenOffice (all of which, IIRC, use cairo to generate PostScript, so perhaps that's not as big of a sample as one would think). Needless to say, there are no non-ASCII characters anywhere in the file.
Where that ⬜ should be the 'no such character in this font' dingbat. If I manually feed the document to the printer on TCP port 9100 so I can see errors (rather than using a print spooler) I get this: %%%% If you get a message telling you something cant be deleted, reboot the computer to clear this from memory. Delete any instances of HP 4000 drivers and printers by right clicking and deleting. Under Print Servers, you will see drivers and printers. I used to be able to work around this by running everything through ps2ps with the output language level forced to 1, but this week I have a document that even that's not good enough for it prints two pages of 11 and gives up. Then go to Control Panel, Administrative Tools, Printer Management. The LaserJet 4000 series printers print letter paper at 17 pages per minute, and can be set to print at 600 dpi or 1200 dpi, although when set to print at true 1200 dpi, the printer runs at reduced speed. It's supposed to understand PostScript, but it will frequently refuse to print things that other printers, evince, and ghostscript are all perfectly happy with. The LaserJet 4000/4050 and their respective variants were the first printers released in the 4000 series. I have one of HP's older LaserJet printers (specifically, model 4000).
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