With respect to freely available information, an XP Deus is one of the most ‘non-public’ detectors. You will not find even a disassembly instruction to say nothing of the circuit diagram. Maybe the XP Deus is so good that it never breaks down? See the photos and video: opening the machine, what’s inside.
Opening an XP Deus coil — XP 22.5 DD.
All about the XP Deus metal detector is collected here (repair, videos, tests, comparisons). Plus, there is additional information related to XP Deus (manual, coils, and more) on Knowledgebase pages.