4.2. Power AMP (AMP PCB)No audio output.Protection is activated.Is the power transistor open or shortcircuited?2SB1560/2SD2390Is the emitter resistor of the power transistoropen?0.47ΩIs the base resistor of the power transistoropen?22ΩIs the trimmer potentiometer between thebase of the power transistor open?1kΩAre any other transistors faulty?Are any other resistors faulty?Turn on the power and check that the voltage of each part is correct and that there is an idlingcurrent.Replace the power transistor.Replace the transistor.Replace the resistor.Replace the emitter resistor.Replace the base resistor.Replace the trimmer potentiometers.YESYESYESYESYESYESNONONONONONOYES79
