We have a Xerox 3050 plan printer It’s is basically running fine, good clear dark prints, but have an issue when coping the dark blue architect plans they come out very dark, almost completely black, even on the lightest settings still very dark, copying white originals the copies are good, perhaps slightly too dark, but no background.

Is there a way to adjust the contrast, to lighten the exposure? Perhaps ajust the lamp VR?

I think the developer/toner level is fine as we recently replaced the dev.