Error codes and symptoms (e.g., “no output in Cut mode but works in Coag,” “continuous activation tone”) are mapped to specific test points on the main PCB. The manual lists expected voltage levels at key nodes (e.g., +5V logic supply, +28V RF driver rail).
: Hosts the RF Service Manual specifically for the 120 model. Key Technical Specifications ellman surgitron 4.0 dual rf service manual