Do not enter the service menu and change values randomly. Copy down all original factory parameters before making changes. Required Equipment for Full Alignment: A calibrated DC Power Supply (13.8V, 25A) An RF Signal Generator (up to 60 MHz) An RF Dummy Load (50-Ohm, 150W minimum) An RF Power Meter / Wattmeter An External Frequency Counter Common Alignment Procedures Covered:
These diagrams help visualize the entire radio structure, making it easier to determine which board (Main or PA) is likely responsible for a specific issue. C. PCB Layouts and Parts Lists yaesu ft-891 service manual
This is just a sample and you should get the real manual to do any repair work. Do not enter the service menu and change values randomly
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