Hello Rosstscpan,
I see no one has responded to this post yet. So, at this point I would recommend contacting your local Xerox Support Department to speak with a Product Specialist for more assistance. Please call 1-800-821-2797 or 1-800-835-6100.
My company uses the the altalink c8155. We need to print halftones at and around 35LPI. I have changed the setting to let the software manage halftones, however they are still coming out at smooth halftones. We need to see the dot pattern to work with screen printing business (see picture below). In the past xerox has sent us a file the we run through the printet that "unlocks the halftone screen". However we have had no luck with our xerox dealer getting these files (the old files don't work). Please let me know if you guys have a solution.