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I have a Fishman pre-amp mod MKAB Acoustic Base Optimized in a Michael Kelly Dragonfly 5FL TBK.. as soon as the plug is pushed in the jack, the battery lite on the amp flashes for an instant , then goes off, I'm not sure if it should stay on all the time OR if it acts like a warning light when the battery voltage goes low. Either way, there is no audio output. Would appreciate any assistance befor eI trouble shoot further. I am a tech so its always wise to ask an expert....... thanks, jerry

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Most acoustic/electric pre-amp's red light comes on when the battery is low & ready to die. The red light flashes when you put the jack in because the battery light takes a fraction of a second to proccess. If the red light flashes off & on when you push on the pre-amp, it is probably because you are causing the battery connector to short or disconnect giving the pre-amp low voltage so the red light comnes on.

Posted on Feb 21, 2012

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Fishman loudbox mini american power to aust power


I'm not as familiar with Fishman products, but you might find your answer on this forum: http://www.acousticguitar.com/ubbcgi/ultimatebb.cgi?ubb=get_topic;f=1;t=030507

Remember to be VERY specific about the problem, what you WANT to work, and what is NOT working as a result of your purchase.

Good luck!

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There are only a few things that could be responsible for your problem. Dirty volume knob on guitar or amp. Faulty ground on all affected parts; including cables. I suggest you plug into a different amp with a new chord, and see if the problem still exists. This way you can quickly eliminate compnents & focus on the actua lproblematic one. If it still exists..you can assume it'sin the pick-up.

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What's your problem?I have two Fishman amps.The older Loudbox 100 single channel and a Loudbox mini. I am trying to find the service manual for the older fishman as I have a fault with it and the


Fishman iis you best bet http://www.fishman.com

You can download the user manuals, they do have a block diagram, but the scan is pretty bad.

It may end up the person looking at it is going to need to rely upon their general knowledge.

My own suggestion is to pull the chassis out so you can work on it while powering it. And then work your way through the amp with either a signal source plugged in at the input, and with high impedance headphones with test lead ends, go through each audio stage carefully. until the fault is isolated. If it is not caps or the rectifiers in the power supply, faulty ground connections to chassis or faceplate, a faulty 4558 is most probable. The headphone approach is the fastest way to address this last one. If a different series of preamp chip is used, a good source for the IC datasheets in general is Digikey http://www.digikey.com and parts too.

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1 Answer

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yes there probably is a dry jopint on the wiring or the jack input isnt tight enough also the battery connector could have a dry solder or looose connection I would go for it if the price is low and just spend a few bob to solder it or check the connections.Good Luck

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