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

I am using microstation v8i ss4 I get these unwanted dots in pdf when converting the dgn to pdf. These contents were converted from suppliers pdf drawing to dxf and then taken into dgn. When I print the pdf the unwanted dots appear. How can I hide or remove these dots.

In dgn the dots are not visible.

Can anybody suggest me an idea to clean these dots.

Parents
  • 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

    Started msnt work 1990 - Retired  Nov 2022 ( oh boy am I old )

    But was long time user V8iss10 (8.11.09.919) dabbler CE  update 16 (10.16.00.80) 

    MicroStation user since 1990 Melbourne Australia.
    click link to PM me 

Reply
  • 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

    Started msnt work 1990 - Retired  Nov 2022 ( oh boy am I old )

    But was long time user V8iss10 (8.11.09.919) dabbler CE  update 16 (10.16.00.80) 

    MicroStation user since 1990 Melbourne Australia.
    click link to PM me 

Children