(1) Common self -faults of the tuning deck: 1. The volume of volume push is not good, and the sound is intermittent during work. 2. The channel input port failure is easy to "up -up". 3. Control system disorders. In short, the failure of the mixer is nothing more than input part, output, control, power part, etc., which are generally caused by aging equipment.

(2) Balancer's common self -fault: 1. Balancer push -push key contact failure, which is the most common, mainly due to the aging of equipment and harsh environment. 2. Internal line failure in the balancer, such as only one -way signal output.

(3) Common self -faults such as pressure limits, electronic frequency division, professional feedback suppressor, professional delay device: In addition to the severe aging equipment, these equipment generally will not have big problems. At most, it is to adjust the knob and the back plate. There is a little problem with the signal socket.

(4) Common faults of digital effects: 1. Noise, digital effects have a certain digital noise when processing audio signals. If the signal line is not shielded, the noise will be like rain. 2. The core part of the digital effect is the digital processing chip. When these digital chips also fail, I have seen a Yamaha500 effector that can be turned on but not working. Complex digital chips can not be repaired at all.