I put the PCL driver on and got them to try but same result. If the only work around is to convert to a pdf and then print then I will inform them of this as it prints correctly when that method is used.
As for usung the PPD driver I'm not sure where to install that within CAD as no experiance on that and would refer the customer back to CAD tech support for that.
You would likely be much better off using the PCL driver in the case of any CAD application. For multiple reasons.
PS code is better for color, PCL for accuracy, PCL.
Transparencies are truly misunderstood in printing, the printer knows there is something there, typically it will try to print it, so most often you would get a dark spot in its place, in Postscript applications, there is often a Transparency flattener, with PDF, they developed the pdf/x format, which is designed for print and therefore doesn't send it to the printer. Then there is Composite Overprint which often can push the transparency to the bottom layer where it won't affect t anything.
So the easiest method is likely to switch to PCL for CAD applications, then you have the Export to pdf and print from acrobat option assuming it shows up in Acrobat ok (I've seen lots that don't)
Then there is shot - in - the - dark try until you find one that works options in the driver. These specific ones is where I would start.
As for the CAD software, my experience with that ended really in about 2001 ;-) . Some of them use PPD's as well, if that is the case, make sure it is loaded in the application.
When printing a plot from CAD LT2105 and tick the plot transparancies option I'm only getting the first 15mm of the image then the rest is blank. If the option is unticked then all prints ok.
I'm using the latest PS driver and it the built in controller.
Is there anything within the Xerox driver that would allow this to be printed?