Yaesu FT-107 Memory Shift Issue

Discussion in 'Radio Circuits, Repair & Performance' started by WB2QLL, Jul 31, 2020.

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  1. WB2QLL

    WB2QLL Ham Member QRZ Page

    Just this week got an FT-107M, this is the #6 run with WARC and DMS. The DMS memory store and recall works as it should, as does the memory fine. However, when the memory shift button is depressed, the rig starts tuning lower in frequency step by step, and turning the M SFT knob has no effect whatsoever.

    As the manual states, every few steps as it tunes down there's a brief chirp as the DMS relocks, leading me to believe the DMS is working but something is tying its input high or low to cause it to change frequency. Again, only when M SFT is depressed.

    I have the manual in both physical and electronic form and have tried to find the M SFT control, but I can't find it on the diagram. The photo-interrupter control assembly itself looks very complex.

    I appreciate the help.


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