First off, that whole ad seems to be a jpeg, so I don't think there really is anything there to trap. What you see in the print may jst be the ant-aliasing of the type.
How are you printing?
How are you making the PDF. Trapping isn't applied when you export a PDF.
It is possible to make a trapped composite PDF if you save a postscript file with the Output>Color set to In-Rip Separations and make the PDF from Distiller.
You can trap images internally but it's not the default, so you need to open the Trap panel and check Trap Images Internally:
The trap will likely be pretty ragged with a jpeg because of the compression artifacts, but with 100% cyan on black only you'll need it. You could also open the placed jpeg in Photoshop and trap it there via Image>Trap... I'm guessing the results will be better out of PS, this is a 2 pixel trap:
Thanks to all, this is a PDF sent to us by customer, we have no control over it.
Guess we're stuck with what we get.
As to how we're printing, it's a round-a-bout way --- we print on an HP 5000 laserjet to positive, then contact to film negative, then make metal plate... poor man's way to get good quality with limited resources. It works, hey, that's something!!
Thanks to all, Lamar