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Sound reinforcement system common faults and solutions
1. The sound reinforcement system sometimes emits a "click" sound, especially during the playing of music.
Cause of failure: There is a phenomenon of joint welding between the equipment of the sound reinforcement system. When there are music signals, the virtual solder joint makes the signal intermittent
Solution: (1) It is necessary to thoroughly check the wiring of each channel. It is better to re-weld the connection points.
(2) If the connection solder joints are thoroughly inspected, the “scrutiny†phenomenon still occurs. The connection line may be disconnected. Check each of the wires with a multimeter and replace the cables with broken wires inside.
2, sound amplification system without sound
Fault reason: The power plug of one or several devices in the connected audio equipment is not inserted properly
Solution: Check the power terminal board so that the socket contacts well
3, when the sound reinforcement system is muted, the hum sound is serious
Cause of failure: poor connection or false welding of the connection shield of each channel device
Solution: Carefully check the shielded wires between the devices and try to use soldering
Fault reason: The device with three-pin power plug is connected to the two-wire input socket, and the two-phase power cord is reversed to the neutral wire.
Solution: The two-wire input socket, neutral line and fire line must be reversed. Generally, the left foot of the socket is a fire wire and the right foot is a neutral wire. Power plug board should be configured with three legs, and the middle and top pins should be connected to earth ground to ensure power safety
Cause of failure: Some audio devices use two-pin plugs, but some devices must use three-pin plugs. Otherwise, AC induction may occur during connection, leading to hum
Solution: Turn the plug of the audio device of the 2-pin plug upside down
4. During the process of sound reinforcement, a group of speakers or two groups of speakers on the left and right channel ports suddenly sounds silent
Cause of the fault: Under normal circumstances, it is due to the amplifier overloaded or the sound box is subjected to too much sound power and burned.
Solution: (1), replace the amplifier or speaker
(2) Replacing abnormally paired high-power transistors and repairing the amplifier must pay attention to the occurrence of this situation. All of these are caused by overload. Attention should be paid to the operation when tuning. To protect the amplifier or speaker, sound reinforcement system can consider adding limiter
5. In the karaoke hall, the vocals of the singers are separated from the playing music accompaniment and are not merged.
Cause: The left and right channels of the audio source enter the mixer, and the panning buttons on the corresponding channels are randomly placed, causing confusion
Solution: Correct the adjustment of the corresponding channel panning knob so that the console's output signal retains the sound image of the original sound source
The reason of the trouble: The room equalizer only compensates for the sound of music, or the room equalizer room balance curve adjustment is not reasonable
Solution: Re-adjust the room equalization compensation curve
6. When the sound system and the lighting system are operating at the same time, the acoustic noise of the sound system is very loud. After the light system is turned off, the sound system operation is inaudible.
Cause of failure: Sound system and lighting system share the same single-phase power. The thyristor of the lighting system has a large operating current and is an AC pulse type. It is directly coupled to the input of the expansion device through the power supply lead, resulting in a large hum
Solution: (1) A single-phase power supply for the audio system and another single-phase power supply for the lighting system
(2) The power supply of the sound system adopts an isolation transformer, and the power of the isolation transformer should be higher than that of the sound system.
7. The effect of singing sounds sounds small and not full
The reason of the failure may be that only the single-channel effect sound of the effect machine is used, or the two-input and two-out connections of the effect machine are not used.
Solution: The general effect machine has left and right channel input and left and right channel output, try to connect in this way
8, the effect of singing voice processing did not join
Cause of the malfunction: The vocals do not enter the effect machine
Solution: Open the corresponding auxiliary knob on the singing channel, open the auxiliary knob sent by the auxiliary bus, observe the input signal indicator of the effect machine, and see if there is any input signal.
Cause of failure: The effect sound sent by the effect machine is not programmed into the left and right channel buses or the group bus.
Solution: Press the button programmed into the corresponding bus
Cause of the malfunction: The effect machine is damaged
Solution: replace the effect machine
9, microphone into the mixer silent signal
Cause of failure: poor microphone switch contact, microphone switch is not open, or the microphone is damaged
Solution: Check the microphone cable, turn on the microphone switch or change the microphone
10, handheld stage wired microphone, slightly swinging motion, sound box issued a "click" sound
Cause of failure: poor microphone switch contact
Solution: Replace the microphone switch, or re-weld the switch wiring
Cause of the fault: The microphone terminal appears off-line, or the shielded cable runs into the signal line
Solution: Unpack the card connector, secure the disconnected wire, and clearly separate the shield and signal wires.
11, left and right channel speaker sound unbalanced
Fault reason: The sensitivity of the left and right channel speakers is different
Solution: Adjust the output levels of the left and right channels so that the sound of the speakers is nearly the same
Cause of failure: Unbalanced output signal of left and right channels
Solution: Adjust the device input level for each channel to approximately the same indication
12. When a single microphone is connected, the volume is larger. When two microphones are connected, the volume decreases
Cause of failure: Inverting the signal of two microphone input mixers
Solution: If the mixer has an inverting button for each input, press one of the two mic inputs and press the invert button. If the mixer does not have an invert button for each input, one of the microphone signals will be used. Welded wire, welded after reconciliation
13. After the wireless microphone is turned on, aim at the microphone and speak without sound
Cause of the problem: Insufficient battery on wireless microphone
Solution: Replace the battery
Cause of malfunction: Tuner volume is not turned on
Solution: Turn on the tuner volume switch and exceed 3/5
Cause of failure: Tuner receiving antenna angle is not adjusted
Solution: Change the receiver antenna angle of the tuner to avoid blind spots in the active area of ​​the host.
14, left and right channel speakers are split type, each speaker sound uneven
Fault reason: The two-channel electronic crossover frequency divider is not adjusted well
Solution: According to the use of divider, carefully adjust the crossover frequency of the high and low ends
15, the left and right audio channels have output, no sound signal output after entering the mixer
Cause of the problem: The set value attenuation button of the corresponding input channel on the mixer is pressed
Solution: Eject the corresponding channel's setting attenuation key on the mixer
Cause of failure: Gain adjustment on the corresponding channel is at the lowest position
Solution: Turn on the gain adjustment of the corresponding channel and place it on the 2/3 position
Cause of failure: The panning button on the corresponding channel is placed opposite to the input left and right channel signals.
Solution: Position the panning button on the corresponding channel in accordance with the input left and right channel signals
Cause of failure: Poor contact or disconnection of the input mixer plug
Solution: check the input plug, firmly welded
Cause of failure: Poor contact or take off of the mixer output
Solution: Check the mixer output plug, connect it properly, and securely solder
Cause of failure: The input signal is not programmed into the corresponding output bus
Solution: Press the edit button for the corresponding output
16, sound source sound, sound reinforcement system speakers silent
Cause of failure: No sound signal is output from the sound source, or there is a short circuit or open circuit at the output socket of the sound source device
Solution: Repair the sound source device or replace the sound source device. Carefully check the sound source in the wiring and plug sockets, eliminate short circuit or open circuit
Cause of the fault: Open or short circuit between the cables between the devices
Solution: Carefully check the connection status of each device's wiring and plugs and sockets, and eliminate the need for dummy welding, desoldering, and short-circuiting.
Fault reason: One or several power switches of the series connection device are not connected, and the acoustic signal is interrupted
Solution: Turn on the power of the audio device
Cause of malfunction: Sound source button misalignment on mixer input channel
Solution: Correctly place the sound source switch button
17, left and right channel speakers which way tweeter (high-frequency head) no high
The cause of the malfunction: The speaker tweeter overload burned
Solution: The power amplifier two input signals are reversed. If the speaker tweeter still has no high tone, the tweeter is burned and the voice coil should be replaced.