If you want, I can produce a detailed PCB schematic diagram (SVG/PDF) or a parts placement PCB layout—specify which.
A primary feature of the MD-100 is its bottom-mounted switches that allow for real-time audio tailoring: Yaesu Md 100 Schematic
Many users are confused by the two-stage PTT. The schematic reveals a clever diode logic: If you want, I can produce a detailed