Behringer, an audio company based in Germany, manufactures mixers and effects processing equipment for live music reproduction, audio recording and professional disc jockeys. When your mixer stops working or starts to malfunction, repairing it usually means dismantling the mixer and cleaning it out. While it is possible to perform basic repairs yourself, serious electrical repairs should be left to a qualified audio electronics equipment. Attempting major repairs yourself will void your mixer's warranty.
Power down your mixer and unplug all microphone, speaker and instrument cables from all connectors on the mixer. Unplug the mixer's power cable.
Remove all knobs from the mixer. Most knobs can be removed by pulling straight up on each knob. Separate each group of knobs by the section of the mixer they were removed from. For instance, store all volume and fader knobs in one plastic bag, and store all equalisation knobs in a separate bag. Label each bag accordingly to avoid confusion.
Locate, loosen and remove all Phillips screws fastening the mixer's outer casing in place. Remove each piece of the mixer's outer housing to reveal the mixer's internal electronics.
Blow out all dust and debris from inside the mixer with a can of compressed air. Give special attention to circuit board areas and the individual transistors on each circuit board inside the mixer. Be as thorough as possible.
Apply a high-end audio cleaning fluid to a clean wash cloth or paper towel. Wipe down all transistors, circuit board and audio connectors (XLR, quarter-inch and RCA connectors). You can use rubbing alcohol in lieu of a high-end cleaning solution, though a cleaning solution is formulated specifically for audio electronic components.
Replace the mixer's external housing, its retaining screws and all removed knobs and/or buttons.