Effects button not working!!!!

Check that all the eqs are set not to cut bass, check there are no effects on and that the XPQ is off. If you still have the problem how sure are you there is no bass coming from the mixer? Have you tried it with another amp? We had one hire customer who had the same problem you describe and his amp had a crossover and it was set to act as a mid/top amp and wasn't giving him any bass, unsurprisingly, switching it back to full range sorted it.

Behringer fired their USA distributed a few weeks ago. You'll have to call Behringer directly and request the part. Or email.goto th website

the faders were actually fails functioning it well, it must be replace a new one!im a audio technician of BEHRINGER!

Open the unit and search for a hot chip with your finger on the failing side.

One of the chips or circuitry is likely drawing too much current. I have seen traces on a circuit board start to short out and cause this due to spillage of liquid in a mixer.

You could use circuit cooler to cool suspect chips to see if it restores. This would be a quick way to isolate bad chip.

Semiconductor things involved with sending the booth signals into the mains are:

IC2 which is a 5241 gate controlled by MIC_ON.

IC30 4580 summer for MIC and BOOTH.

IC53 4580 inversion and gain control.

IC39 4580 MAIN output drivers.

You MAY have to exit the mode first to change it... Try pressing the sync-lock button to exit the mode before changing.

The D2 PROBABLY means "delay 2"... although the documentation is really poor... One has to read between the lines...

This is a wild educated guess.

I repaired a Behringer guitar amp that had a DSP effects in it (BX1200 I believe).

The effects were on a seperate board and the board had its own 5 volt power supply. The filter capacitor for the 5 volt power on the board was UNDERSIZED and it had degraded causing the 5 volts to drop out of regulation, dipping to 4 volts. This caused the DSP effects to fail.

YOUR device MAY use the same DSP OR design.

Check the 5 volt power with an OSCILLOSCOPE to look for dips below the 5 volt operating point that occur at 120 HZ.

Behringer only gives schematics to their authorized service people.

I find I can usually trace stuff out as needed as the mixers are a very symetrical repeating circuitry.

Most components are readily available from other sources.

The effects on the PMP powered mixers flash UNTIL you push in on the selector knob. This way you can dial in the next effect number and then push in later to activate when you want it... Could yours possibly be the same technique?

Most likely internal fuse for effects module has blown. look inside the mixer for the blown fuse (it'll be near the bit that's not working) and replace with a fuse of the same rating,