I dont know that this might fix your issue, but I have a laserjet 1012 and many times, I get "unknown personality" and that's it, printed out on a piece of paper.
Well, I used to actually. I installed the hp printing software it took care of my problem 100%
I dont know if FC has that in their distro or not, but you may want to check into that.
The hp software is a sourceforge project, but there is a link to it from the HP download drivers page at HP site.
GL
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