Yaesu Ft-891 Service Manual Repack Jun 2026

Using a dummy load and a digital multimeter (DMM), measure these test points. If voltage is correct but actual RF power is low, the issue is between the directional coupler and the final amplifier. If voltage is low, the issue is in the ALC or pre-driver stages.

Step-by-step instructions for calibrating the reference frequency, local oscillators, receiver sensitivity (S-meter levels), and transmitter power/bias. yaesu ft-891 service manual