Behringer B312

[lowell]

Yes, another Behringer. It's a Eurolive B312. This thing has not woofer output. "high out" is working. With my signal tracer I get signal before L1 but not after. L1 is the inductor that filters out the Class D noise before the woofer. I measure 170k DC resistance across it and about 160mH. The schematic states 57uH. Anyone think that it's bad from these measurements? Ever seen this problem?

[Tubebass]

Hi Lowell, the DC resistance of that inductor should be less than an ohm. Looks like it's shot.

[52 Bill]

I agree, I can't imagine any output coil with a resistance of 170K. Try replacing it.

[lowell]

wow, ok. Thanks! Now for finding one. I emailed Music Group for it but not sure they'll have one.

[52 Bill]

It's just a coil of wire, check to see if one of the ends is broken or if there is a cold solder joint.

[lowell]

You're right. I figured since I wasn't getting OL on the meter that it was indeed connected. But there is most likely a parallel path that the meter is seeing.

[Enzo]

Usually one end has broken off from the board. If nothing else, you might try unwinding one turn - if it at the outside end - and using that extra lead length for the repair. We might be able to come up with one, if it is not salvagable

[lowell]

Thank you. Is was indeed broken. Not visible til I pulled it off the glue. I scraped the coating off the lead on the broken end. Soldered bus wire to it, filed a U shape into the side and got it fit right back in. Added a fair amount of glue gun glue to keep it on the board.

[lowell]

Yep, had replaced the mosfet driver to this thing cause had no signal ON its output, and after repairing the induction It's all fixed.

[deltagulf]

Good day,I am new to this forum and firstly would like to introduce myself.I am experiencing some problems with my B312,and was wondering if anyone can assist me with a schematic.Thanks.