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can you tell if there is a wire broken? if you know how to use a vom meter you can check to see if you have continuity if you don't then you have a wire problem & make sure that your battery is good.
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.
I don't understand your question. The "Aux in" is just that an input that goes to the power amp. Please note that the Fishman Loudbox does NOT have a headphone jack so don't be disappointed as there plain isn't a headphone jack on this unit. I would recommend that you get a small headphone amplifier for the purpose... or even go to a thrift store and get an old stereo system that has a headphone jack and use that.
The fuse is inside and if it blows, there is something wrong that caused the failure and MUST be repaired as just changing the fuse MAY do additional damage.
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