[OS X TeX] Pb with Epson printer

[Eric DÉTREZ]

Hello

I hope it's a question that fits with this list's aims.

I schitched to a mac book with osx 10.4 from an old imac with system 9.
My printer is an Epson EPL-5800.
I used to print without any problem with system 9 but now the math  
characters (\int, \oplus, ...) doesn't print anymore.
They are in the pdf (on the screen)
They print when i transfer my pdf file to the old imac
They print on another printer (HP) from the macbook.

Is it any hope I don't have to buy another printer ?

Thank's by advance.