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Various things could have contributed to this, eg, details of the CMYK profile u used (compared to what the printer needed / expected), line screen frequency compared to your ppi, etc..  If u could provide a very high resolution scan of a single letter or two of the printed version (so we can easily see individual half tone dots), as well as the same area of your original PSD and PDF files, we could possibly diagnose it.  Without these, the best anyone can do is try to make informed guesses.

Tom M

PS - please also include a scan of some good looking text or advertisement on the same printed page (with exactly the same scan settings), as well as a normal resolution scan of the entire printed page, or, at least, most of it.