Hi Richard,
I am glad to read that even you are using OrCAD SDT...Well you are not alone, even I use it...even today!!!

Here is(was) my method to Create PDF File out of Orcad SDT.

Complete the Design in SDT.
1.Configure Orcad "PL: Plotter Driver" to PSCRIPT.DRV"
2.Give the command "PLOTALL FileName.sch FileName.000"
3.A file will be created with a name "FileName.000"
4.Rename this File to "FileName.PS"

This is a Postscript file. Now you can use any of the utilities that can convert this *.PS File to *.PDF.

The above method might seem to be Long and tedious, but you can generate a Batch File to do the above; and in one single command from the "Good Old DOS Prompt" your *.PS File is ready.

My preference was to use the CorelDraw...import *.PS File in CorelDRAW, and File->"Publish to PDF"....My PDF File is Ready.



Now I use Orcad 7. With a utility (link) I posted, I can get a PDF File directly without any conversion utilities. Just Select the PDF Creator as the default printer.

Happy "Creating PDFs"...
With best regards from,
Kiran V Sutar