Good evening again.
Well this weekend, I pulled out my old Beckman logic analyzer and started
tracking down the scan command
in the FT-5100 and found the problem. Between the display board and the CPU
board is a small flexible
PC board that's used to connect them together. This board has some of the
lines open and some of them resistive. Yaesu does not show this board as a
separate part. I suspect it was sold as part of a complete
controller (CPU) assembly. The board gets flexed every time the radio is
opened to change the backup battery.
On this radio, I only get 3-4 years out of a battery, and I've had it for 13
years. I suspect others have had this
same issue. Wondering what you did? Thanks in advance
Dave WA0ZZG
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