Question about Fishman Music

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Unit inoperative, one LED blip on battery install only.

Martin Guitar with a Fishman Classic4. New 9VDC battery installed, LED blips once only. I can slide the Fishman out, squeeze the battery tighter to the connections (assuming it was too loose) and same - only one blip. I even went as far as removing the whole unit from the body of the guitar in order to wiggle test, tap, squeeze anything, and still the same - one blip only and can hear a faint pop in the Amp that the guitar is plugged into. i am pretty handy and knowledgeable in electronics and am suspecting an internal problem in the Fishman's IC board/components. Thanks in advance!

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  • Brad
    Brad May 19, 2009

    The single "blip" is normal:

    Low Battery Light
    This light has two distinct functions:
    1. Power Up Indicator
    The low battery LED will flash briefly when you plug in your guitar. Some people ask us, "why doesn't this light stay on, like a conventional pilot light?" We believe that a steadily lit LED devours too many precious hours of battery life. Since the light flashes briefly only when the unit turns on, battery power is conserved and battery life is extended.

    2. Low Battery Warning
    When the Low Battery LED lights steadily, it is time to change the battery.

  • Brad
    Brad May 20, 2009

    I tested out the cord (was fine) re-soldered and re installed it. I tested out the marshall amp and found the acoustic input is dead. (aux input is fine and all works there) Off to shift my attn to the amp board & jack!

  • Brad
    Brad May 23, 2009

    After re installing the Fishman, I checked output on an oscilloscope - signals out looked good. I went to the Marshall amp and found the culprit - acoustic input jack - one leg was broken off the circuit board. Swapped with Aux. input jack (not used) and all is well.
    Thanks all.

  • rjivaro May 11, 2010

    Before you tear into the circuitry, try using a different guitar cord. Stranger things have happened. :)



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Its possible that if you changed strings the saddle might have changed position in its slot. It has to sit uniformly on top of the piezo element in order to work properly. Try testing the pickup(piezo element) first before suspecting the preamp.

Posted on May 23, 2009


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