Thin lines in pdf file

Hi all!
I have a question. The same problem in Illustrator CS6 (but it appears from a few version of CS back).
I have document in an Illustrator. The document is generally for print, I don't using them to making website, so without using Slice tool.
I need have separation pdf so first I print the document to postrscript usind pdf ppd. Always the same settings:
1. General - only media size
2. Marks and Bleed - none (i mean all off)
3. Output - mode: Separations (host-based), and rest like is: emulsion: Up, Image: Positive, Printer Resolution: 71lpi/600dpi
4. Graphic - none
5. Color Managment - none
6. Advanced - none
7. Summary - none
After printing I have a separation, pdf file. Always appears vertical and horizontal thin white lines, like document was preparing for website and sliced.
Why this happend? Can I use some settings to avoid this situation? I tried a various setting but the lines always appears.. Help!

It always was in a bitmap.
2013/8/21 Monika Gause <[email protected]>
Re: thin lines in pdf file created by Monika Gause<http://forums.adobe.com/people/Monika+Gause>in
Illustrator - View the full discussion<http://forums.adobe.com/message/5613437#5613437

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// 10dec10: bug of contour plots in pdf's having white lines on mac
x=span(0,3,21);
y=span(-2,2,30);
x2 = x(,-) + 0*y(-,);
y2 = 0*x(,-) + y(-,);
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png,"pdfmacbug_pli.png";
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