Audio system fault check and solution

Brief analysis of sound strategy (1)

There are various problems with the audio system, don't rush to send it for repair, first see if some of the audio system maintenance tips introduced here are useful.

One. Acoustic music is silent

1. Take a wired microphone and insert it into the M1C (microphone) input port of the combined power amplifier, turn on the power amplifier power, turn on the microphone front input control button to the 12 o'clock position, and turn the microphone output volume button to the 12 o'clock position. Open the microphone switch to shout, if the microphone is silent, then in turn the microphone of the direct plug are inserted into the other two microphone input ports test, all input ports have been tried after still silent may have the power amplifier has failed, you can contact the technical engineer of the factory by phone to consult the treatment method, in the absence of electronic technical support, the fault status of the power amplifier should be written on the small paper piece and stick the small paper piece on the power amplifier, packaged and returned to the factory for maintenance.

2. If the microphone is sound and the music is silent after following the above method, you should first check whether the input of the audio source (VOD) is correct, whether the input cable is intact and has been reasonably connected to the amplifier, if the cable is intact and connected correctly, but the music is still silent, you can check whether the music input port selection on the front panel of the power amplifier is consistent with the audio input port, and the input port can be re-selected to have music sound (if the cable is output from VOD and then connected to the "CD" input of the power amplifier, but "VOD" is selected on the front panel of the power amplifier) port, then the music must be silent).

3. If the music is still silent after the above inspection operation, and the microphone has sound, check whether the VOD is faulty. You can move the amplifier to a room where the music and microphone are sound to check it, and if the music is sound in another room, you can check whether there is a problem with the VOD (song computer). If there is a problem with the VOD setting or output, reset the setting to solve it.

4. If the audio uses a combination of professional pre-stage and professional amplifier, the inspection is roughly the same as the above method.

Two. The sound of the stereo is not normal

1. The speaker is generally impossible to burn out all the high, medium and bass units at once, so if the speaker is silent,        please check whether there is a problem with VOD, pre-stage, and power amplifier, and then check the speaker after determining.

2. The speaker emits an abnormal sound of "bubu".

   
   

   (1) Disassemble the box network, check whether the box body has air leakage, whether the unit is installed firmly

   on the box (sometimes the unit is not firmly installed, and the iron edge of the unit collides with the box during the

   use of high power and dynamic will also emit a strange sound of air leakage), such as each unit is installed firmly,

   listen carefully to determine which unit the abnormal sound comes from.

   (2) Remove the unit with abnormal sound, place the unit flat on the ground, check whether the bubble edge is leaked

   and degummed, and whether the dust cap is degummed (usually the sound of "bubu" is related to the above reasons).

   If there is no degumming and leakage, use your right finger as a triangular balance to naturally push down the paper tray

   of the unit (when the normal unit pushes down, there should be no noise, and the unit due to edge rubbing, voice coil

   deformation and other reasons will emit abnormal noise. )

   (3) If the unit is not firmly installed and makes noise, it can be reinstalled firmly, if the unit bubble edge or dust cap is

   degummed and leaked, it can be sealed with agricultural machinery glue (glue for roadside leather shoes) to make up

   for natural air drying.

   (4) Check whether the contact point between the iron mesh of the speaker and the cabinet body is free of foam rubber

   buffer strips, if not, add rubber strips to remove noise.

   (5) If the speaker unit burns out, it should be returned to the manufacturer for maintenance, because the voice coil and

   paper cone will affect the timbre, and the timbre of the speaker will change if the original factory is not used.

3. If the music is still silent after the above inspection operation, and the microphone has sound, check whether the VOD

   is faulty. You can move the amplifier to a room where the music and microphone are sound to check it, and if the music

   is sound in another room, you can check whether there is a problem with the VOD (song computer). If there is a problem

   with the VOD setting or output, reset the setting to solve it.

 Brief analysis of sound strategy (2)

How to check for sound inversion and microphone noise and how to resolve similar failures.

One. Speaker reverse

   1. Check whether the speaker line connection at the output end of the power amplifier is correct

      (the positive pole should be connected to the positive pole, and the negative pole should be connected to the negative pole, 

      generally the positive pole is red. ), and then check whether the port of the speaker cable connected to the speaker is 

      connected correctly, if the system connection error causes inversion, then restore the correct connection.

   2.If the speaker unit is installed in reverse, disassemble the speaker, check whether the connection cable of the woofer is 

      wrong, and if it is wrong, reconnect the two wires correctly. In addition, a battery can be used for polarity test, and the 

      speaker cable can be used to touch the battery to see the direction of action of the speaker unit. After the positive and 

      negative poles of the speaker line collide with the positive and negative poles of the battery, if the woofer moves outward, 

      the phase is normal, and if the speaker is retracted, it is inverted.

   3.In addition, if the speaker is installed in reverse, the simplest way is to connect the positive and negative poles of the 

      speaker line of a speaker in reverse on the output end of the power amplifier.

One. The microphone makes a "silky" sound

   1. Check whether the connecting wire (especially the ground wire) has desoldering, poor contact and other conditions. If so, 

       re-solder.

  2.Check whether the microphone cable has problems such as internal break and poor contact. If there is an internal break, 

     the thread should be changed.