Unwanted dots appear in pdf when converted from Microstation v8i ss4 dgn

Not sure if this is of any value, but you can check your pltcfg and see if Print Points is set to True under the Advanced Tab. This option states it is for Pattern Points

Are you able to select these points on the screen? It's hard to tell from the screenshots but I do see what appears to be points in the CADD shot. Maybe they are on a level being controlled by a pen table to print at a heavier weight.

It would be best to supply an actual dgn file with some of these dots. 

just out of curiosity 

first you received the drg as pdf why not a vector  like dgn or dwg?

second how did you change the pdf to vector like dxf? what process and  what software?

Lorys,

Most of the supplier send their drawings in pdf and they resist to send the dgn or dwg version.

Second, I converted to pdf to dwg using pdf2cad ver 6.5 converter tool developed by visual integrity

Regards,

Narayan

That may have introduced some unwanted or corrupt elements. Have you used this process before with good results?

Can you attach a sample portion of this drawing? We don't need the whole thing - just a small part that has the problems. If we can play with your actual drawing, we might be able to determine what those spots are made of.