【 Weak current College 】 sound reinforcement system faults

Sound reinforcement system of symptoms, causes and solution as shown below.
(A):
No sound playback sound reinforcement systems
1 threaded audio device from one or more device power plug is plugged in.
Solution: check the power strip, make socket contact good
(2):
Sound reinforcement system sometimes "sentries" sound, especially when playing music, continuing this phenomenon
1 sound reinforcement system device connector has virtual welding phenomena. In the music signals, sound signals virtual solder joints make sporadic
Solution: (1) must thoroughly check various channel equipment wiring, best heavy welding connection points; (2) If a thorough examination of the solder connection, still has the "a-cha" phenomenon, there may be a connector line, using a multimeter check each wire, will have a broken line inside the cable replacement
(3):
Mute the sound reinforcement systems, AC sound serious
1 the channel device shielded cable bad or soldered
Solution: check the shield line between devices, try to use welding
2 there are three-foot power plug of the device connected to a second line input jacks and the level of FireWire and neutral line reverse
Workaround: you must set the input socket of the second line, neutral and FireWire reversed. General Jack left foot to right foot FireWire, as neutral. Power supply Panel should be configured in three feet, above the pins should be connected to earth ground to ensure electrical safety
3 some audio equipment using 2-pin plug, but some of the equipment must be three-pin plugs, which may occur when you connect the AC induction phenomenon leads to hum
Workaround: Add two-pin plug of the audio devices from their electrical outlets reversed
(4):
Sound system and lights system while running audio system AC noise is very big, but light system shut down, the sound system is running you hear the hum
Sound and light system share the same single phase power. Lighting system controlled rectifier operating current is large, but also through the exchange of pulse power inlet directly coupled to the enlargement device input, resulting in a very big hum
Solution: (1) sound system with a single-phase power supply, lighting system with a single-phase power; (2) audio system powered by isolating transformer, isolation transformers of power than the sound system with power big
(5):
In sound reinforcement, left and right channels of a set of computer speakers or two sets of speaker suddenly silent
In General, is due to a power amplifier overload destroyed or speakers around bear sound power too great burning
Solution: (1) replace the amplifier or speaker; and (2) replace the special pairing, high-power transistor amplifier repair, you must be aware of this situation are overload, tuning should pay great attention to operational problems. In order to protect the power amplifier or speaker, sound reinforcement system can consider joining limiter
(6):
In karaoke room, singing the sound of singing and playing music accompaniment of separation, not fusion
1. audio sources left and right channels into the mixer, the corresponding channel's sound like spin out, resulting in the sound like confusion
Solution: correct the corresponding channel sound like spin of regulation, so that the mixer's output signal to retain the original sound source of sound and image

2. room Equalizer only on music for compensation, or the room room equalization curve Equalizer unreasonable regulation
Workaround:
Resize the room equalization curve
(7):
Singing sound effects processing isn't
1. sing sound effect is not into the machine
Workaround: the singing sound channel corresponding auxiliary knob open, open secondary bus sent secondary knobs and observation effect machine input signal indicator, if there is no input signal
2. the effect of the machine out of the left and right channels of sound is not included in the bus, or group bus
Workaround: press the keys into the corresponding bus
3. the effect of the machine is damaged
Solution: replace the effect machines
(8):
Singing sound effect levovist small and not enough plump
You may only use the effects sound effect of single machine, or fails to effect machine binary II out connection
Workaround: general effect machines are left channel input and output, as much as possible about channel will connect this way
(9):
Sound source reproducing, silent sound reinforcement system speaker
1. put the sound source without output acoustic signals, or sound source device output plugs shorts or open circuit phenomenon
Solution: the maintenance of sound source device or replace sound source equipment. Carefully check the sound source in wiring and plugs, exclude short circuit or open circuit
2. the connection between the devices exist open circuit or short circuit
Solution: check the device wiring and plug, socket connection, exclude the virtual welding, welding, shorted
3. threaded device from one or several sets of power switch is not connected, the sound signal interrupts
Workaround:
Connect the audio equipment power supply
4. Enter the channel mixer sound source press misplaced
Solution: correct placement of sound source switch button
(10):
Microphone plugged into the mixer silent signals
Microphone off bad, microphone switch is not turned on, or the microphone is damaged
Solution: check the microphone connector on the microphone switch or replace microphone
(11):
Hand-held wired microphone stage, slight swing movement, sound reinforcement speaker "sentries" sound
1. microphone switch bad
Solution: replace the microphone switch, or welding switch wiring
2. microphone Terminal occur off-line, or shielded line caught signal cable phenomenon
Workaround: open the card holder, you plug the off-line welding, shielded wire and signal lines clearly separated, welded solid
(12): a single microphone is switched on, the volume is large. Two-channel microphone is switched on, the volume will decrease
Two-channel microphone input mixerInvert the signal
Workaround: If you enter a per-channel mixing console with inverted phase press, two-channel microphone input phase all the way in which key is pressed, if not every road input mixer set down-press, which had a microphone signal wire welding, swap and then welded solid (13):
Wireless microphone is open, at the microphone to speak no sound
1. wireless microphone battery on the
Solution: replace the batteries with new ones
2. tuner level is not open
Workaround: open the tuner level switch, and more than 3/5
3. tuner receiver antenna angle is not good
Workaround: change the tuner antennas receive perspective, avoid dead-end host activity area
(14):
Sources left and right channels are output into a mixer after no sound signal output
1. on the corresponding input channel mixer fixed value decay key is pressed
Workaround:
Pop up on the corresponding channel mixer fixed value decay key
2. the corresponding channel gain adjustment is placed in the lowest position
Workaround: open the appropriate channel for gain adjustment, on 2/3 positions
3. the appropriate channel of spin button placement and input signal instead of left and right channels
Workaround: the corresponding channel sound like spin button placement and enter the left and right channel signal is consistent
4. enter a mixer of the plug is bad or off-line
Solution: check the input plugs, solid welding
5. mixer output bad or unsoldering
Solution: check the mixer output plug is properly inserted, solid welding
6. the input signal is not included in the corresponding output on the bus
Workaround: press the corresponding output included in the press
(15):
Left and right channels of sound-reproducing imbalance
1. left and right channels of sound speaker sensitivity is not the same
Solution: adjust the left and right channels of the output level, so that the speaker was almost unanimous
2. left and right channels of output signal imbalance
Workaround: to each channel's device input level adjustment in approximately the same direction on the
(16):
Left and right channels of sound which way treble speakers (tuner) no treble
The way speaker treble speakers overload destroyed
Workaround: to two-channel power amplifier input signals are switched, if the sound treble speakers still no treble, treble speaker burning, should replace the voice coil
(17):
Left and right channels of sound box is split, the speaker sound is not uniform
2-ch electronic frequency divider ratio point is not good
Workaround: use the divider, carefully regulate low-end high frequency point of intersection