Identifying the specific 0-ohm resistors on the control board that dictate frequency coverage.
Step-by-step instructions for calibrating the reference frequency (TCXO), setting the idle current for the final power amplifier (PA) FETs, and adjusting the S-meter. Key Technical Specifications for Servicing yaesu ft-891 service manual
However, here is the definitive guide to obtaining or working around the FT-891 service manual: Identifying the specific 0-ohm resistors on the control