Yesterday I printed the calibration panels supplied in the installation folders and wondered why my laser printer printed them slightly rasterized. I used the PDF-files in different sizes. Today I had the idea to open the PDF files in Adobe illustrator to check the color and I was surprised that the dots where not 100% black but ~85% Cyan, 78% Magenta, 61% Yellow and 96% Black. in RGB mode it was R-G-B: 10-0-0 and in grayscale 98,82%. As soon as I edited the dots to 100% black they printed solid.
Also the PNG-files are only 92% black.