FISHMAN Loudbox Artist repair

white noise in channel 2
The part number for the Q10 is MMBF4392.

[G-vm]

Hola, mi parlante tenía roto una resistencia de 0.1 ohms, la remplaze y suena genial, solo tiene un inconveniente, y es que cada vez que lo enciendo emite un ruido, la primera vez al encenderlo después de un tiempo no hace ningún sonido, pero las veces siguientes lo hace, ya revise capacitores y todo está bien, no ce si sea problema de voltajes de algún regulador o los mismos transistores, pero cuando curse mecatronica en la escuela no aprendí mucho, fue más teoría que practica, y pues como ya no continué la universidad pues me quedé solo con algún conocimiento teórico, por último la llevé con un técnico en reparación y tampoco pudo hacer nada

[mmilanek]

Hello again, I just retested it and found that channel 2 also has white noise but not as much

[CanadaSocial]

Thank you.. I have the same issue... Would you say that the Q10 (MMBF4392) is the same for channel 1 and 2 ?

[mmilanek]

I have a loudbox performer 700bt with the same problem in channel 1 but i don't see a Q10 in it .
Can you tell which component I need . Thanks, Mitch

[MarkCookmusic]

Well this video could go into a little more detail that would help

[davidpatrick]

can I bypass the head part and use the speakers as a speaker cement for a different amp head..? Any idea how to build a speaker unit by itself

[kenneyaustine]

Hello. My loudbox mini's reverb is not working for mic channel. Do you have any Idea how to fix it?

[rubenmborgesmusic]

Channel 2 is significantly louder on my amp. Yes there is more static when I crank the gain for channel 2 but it's also way louder. Idk. I messaged fishman for info.

[lauraharada]

Thanks for this. Do you happen to know if the the part number is the same for Channel 1?

[panzrwagn]

My Loudbox Artist has EXACTLY that same problem, same channel. Where did you source the part?

[thomaschiappisi]

Same issue but in Channel 1 (Top) which FET needs to be replaced for the top channel

[jakelucasmusic]

What if the speaker is making no sound?

[seanmchugh]

I would keep that removed FET for making a pink-noise generator