Postscript driver problem?

Vincent Favre-Nicolin writes:
> I was going to blame hp, but my brother printer (HL5170DN) does not print
> it either - all I get is a postscript error:
> ERROR NAME;
> invalidfont
> COMMAND;
> stringwidth
> OPERAND STACK
> --stringtype--

Thanks for that. I found my printer manual and toggled error
printing. I get a simalr message:

ERROR: invalidfont
OFFENDING COMMAND: stringwidth

STACK:

(psmarker0)