Thank you so much for the schematic for the PB-1827 LED version. I have one of these LED receivers as well as several of the more common VFD versions and have never been able to find any documentation for the later LED version. I don’t think Yaesu made many of these before production? ended.
I found a "Yaesu FR-101 Digital Counter Unit instruction manual" with discription and partlist of the VFD tubes version BUT with a schematic of the PB-1827 LED version. I uploaded it to the Files section.