The Antex DMX8 USB Mixer is a compact digital audio mixer that accepts eight microphone or line inputs and routes the mix to one‑four Hi‑Speed USB recording outputs for PC capture. Common failure modes reported on this model include power supply board faults (over‑voltage on the 5 V rail), USB interface issues (USB‑D+/D– shorting or loose connector), and internal capacitor degradation causing intermittent output dropouts. First‑check steps: verify that the AC adapter supplies correct voltage and current to the mixer’s main board; inspect the USB port for bent pins or corrosion and test with a known good cable; examine the power supply PCB for bulging electrolytics or burn marks, then review any recorded error codes in the accompanying software.[oss-gpt-20b]