PDF PLotting too light

[Anonymous]

Lately, all of my drawings are plotting too light. Everything checks out, settings-wise, as far as I know...Some objects, such as title block and 3D outlines are solid/bold as they should be.

However, all of my linework within the blocks and objects prints so faint it is hardly readable. 

I have looked at the layer transparency; screening; pen settings; etc. I even copied everything into a new dwg on a different version. STILL WRONG.

ATTACHED IS A PDF OF MY ISSUE. I can submit a dwg as well, if needed. 

ANY TIPS/IDEAS?

[S.Faris]

Can we have a look at your Plot settings?

[s.borello]

How are you plotting?  What virtual printer are you using to create said PDF?  Have you bumped up your line weights to something quite bold to see if that is your issue?