The user should place the amplifier in a dry, ventilated place, and avoid working in humid, high temperature, and fume chemical agents.Дў. Otherwise, the fault is in the subsequent circuit.ДЎ. If the noise is significantly reduced, the fault is in the front circuit. The front and rear signal connection plugs can be removed. When repairing, you should first determine whether the noise comes from the front stage or the back stage circuit. The noise of the amplifier includes AC noise, popping noise, induced noise, and white noise. If the sound level of the speaker is the same, the fault is in the rear circuit. For a single channel, the signal output by the pre-stage circuit can be exchanged and input to the post-stage circuit of the other channel. If all are normal, then it depends on whether the fault is in the pre-stage or post-stage circuit. Then check various transfer switches and control potentiometers to see if the volume can be increased. You can use alternative methods to check. When repairing, you should first check whether the signal source and speakers are normal. Tone light refers to the fact that during the amplification and transmission of an audio signal, the gain of the amplifier is reduced or the output power is reduced due to a change in the amplification level of an amplification stage or attenuated at a certain stage. If the positive and negative power supplies are normal, check the amplifier tubes in the power amplifier circuit for damage. If the positive and negative voltages are not symmetrical, the load circuit of the positive and negative power supply can be disconnected, so as to determine whether the power amplifier circuit is faulty or the power supply circuit itself is abnormal. Check whether the positive and negative power supplies are normal. If the midpoint output voltage shifts or the overcurrent detection voltage is abnormal, it means that the power amplifier circuit is faulty. If the relay does not operate, measure the mid-point power amplifier of the power amplifier circuit, whether the overcurrent detection voltage is normal, and whether the output voltage is shifted. When repairing the amplifier with protection circuit, it should be checked whether the protection relay can be pulled in after starting. Silent fault manifests as the corresponding status display when operating each function key, but no signal output.

This image was provided by a registered user 'ж©еђ de ж®їе ‚', Copyright feedback If it is infinite, check whether the primary winding of the transformer is open, whether the fuse is blown, and whether there is a break between the plug and the power line. If the gap is too large and the power transformer is extremely hot, it means that there is a local short circuit in the primary circuit of the power transformer. In normal times, the resistance value is several hundred ohms. The failure of the whole machine is that the amplifier has no display after power-on, each function key is invalid, and there is no sound, just like when it is not powered on.Дuring maintenance, you should first check the power circuit, turn on the power, and use a multimeter to measure the DC resistance value at both ends of the power plug.

Power amplifier repair