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Navman 8120 - fish finder on the blink. . .-gctid813648

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    Navman 8120 - fish finder on the blink. . .-gctid813648

    My old Navman 8120, after years of great service, has started to go on the blink with respect to the sonar function.

    The bottom trace is now indistinct and broken. When I turn the gain up little happens. It used to flood the screen with every particle detected below the boat when the gain is turned up. The depth reading is fine. I can compare it with my back-up device.

    So far, I have cleaned the transom transponder, cleaned the LT6 connector, done a factory reset and checked the spliced cable (all soldered joints).

    Anyone seen this before? I am loathe to start swapping in new parts like a new transponder. It is too hard on the wallet.

    I have thrown myself on merci of Navman Marine but they have no effective representatives in the UK.

    Thanks in advance
    Terry (Retired Diving Instructor and Part Time IT Consultant)
    1998 Bayliner 2452. 5.7l V8 - Edelbrock 1409 4bbl - Alpha1Gen2 - Solent UK.
    MMSI 235061726