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Keep the mixer covered when not in use to prevent dust from settling inside the fader tracks.
| Test Point | Voltage | Tolerance | |------------|---------|-----------| | C222 (+) | +15.0V | ±0.3V | | C223 (-) | -15.0V | ±0.3V | | C224 | +48.0V | ±1.5V | | IC10 (pin 8) | +5.0V | ±0.1V |
Scratchy knobs or sudden drops in volume when moving a fader are caused by dust and carbon track oxidation.
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Always unplug the external power supply and the USB cable before removing any screws.
Carbon track contamination inside potentiometers.
Behringer XENYX QX1202USB Go to product viewer dialog for this item.
Official documentation is typically split between user guides and technical service manuals:
Open the mixer and inspect the large electrolytic smoothing capacitors near the power input jack. Look for bulging tops or leaking fluid.
Carefully lift the top faceplate away from the bottom housing.
The analog main mix routes to both the physical Main Out jacks and the A/D converter of the USB codec chip. 3. Power Supply Specifications and Troubleshooting