UP/DOWN switches: Pin 6 (DOWN) ----+--- 100R ---+--- GND Pin 7 (UP) ----+--- 100R ---+
: A slide switch on the bottom allows the user to bypass the internal equalization ("Thru") or engage the tailored audio filters ("Filter"). 8-Pin Wiring Diagram Yaesu Md 100 Schematic
If your MD-100 stops transmitting, emits a loud hum, or sounds muffled, the schematic points to a few common failure points: Symptom 1: Intermittent Audio or "Humming" Broken shield wire inside the coiled cable. UP/DOWN switches: Pin 6 (DOWN) ----+--- 100R ---+---
: A high-performance dynamic element with a frequency response of 100–5000 Hz. Audio Tailoring (Filters) : emits a loud hum
The MD-100 uses a standard 8-pin round connector (often called a "Hirose" or "Yaesu 8-pin"). The schematic labels each pin: