When a DGN file with PDF rasters is printed on a plotter, the PDF rasters are printed incorrectly. The rasters are not printed completely and there are white stripes over the rasters. If a PDF is created from this DGN drawing (with the PDF rasters) and then this pdf is printed in the plotter, this is also incorrect.
The plotter may be running out of memory. Please try to decrease the "Raster Quality Factor". If this helps, you may have to do several tests to find a value that gives a complete printout and acceptable quality.