Troubleshooting Flowchart#
Use these decision trees to quickly identify the likely failure area based on symptoms.
Symptom: Amplifier Smokes on Power-Up#
Symptom: No Output (Dead)#
Symptom: Distorted Output#
Symptom: Blows Fuses#
Symptom: Protection Triggers / Muted#
Symptom: Supply Voltage Drops Under Load#
Quick Diagnosis Table#
| Symptom | Most Likely Cause | First Check |
|---|---|---|
| Smokes immediately | Shorted FET or diode | Remove FETs, check D801-808 |
| Smokes after delay | Thermal runaway | Gate drivers Q901/Q902 |
| No LED | No power input | Fuses, wiring, remote |
| LED on, no sound | Mute active or preamp | ±14V rails, mute circuit |
| One channel dead | Channel-specific failure | That channel’s transistors |
| Distortion all channels | Power supply issue | Rail voltages |
| Blows fuses | Short circuit | Isolate by removing FETs |
| Gets very hot | Bias problem or short | Check output DC offset |