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Have a look at the pdf with something like GSview or if you use windows AcrobatReader on your PC. You may find they have used a font colour that is not black which appears a a light grey on a B&W screen.
If that is the case it should be possible to convert the file to a standard B&W which should solve your problem. I have had to do this a few times where a colour has been used for highlighting in a manual.
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