1 guests to reflect anything wrong with the machine, no sound output, how to treat?
A. open the machine cover check whether the fuse is broken, if it is broken, replace the fuse;
B. check input signal protection IC is burst, the burst, need to pay the repair personnel;
The C. circuit is burned? The short needle plate is missing? Install back short pin;
D. check volume, quality adjusted is normal.
2 horn failure, speaker wire short circuit, the impact on the power amplifier?
A. slightly short circuit, the intermittent sound, but a long time will produce a fault relay;
B. fuses, relays
C. is serious, resulting in a power tube burning, more serious two, four burned;
The 3 sound; image input signal short-circuit impact?
The A. damage of IC4052; IC4053
B. severely burned large line
At present around the VOD are modified, low quality of such situation many, if short circuit is a high pressure range, the impact will

be burned to protect IC4052; IC4053; severe burn a lot of line
The 4 power amplifier power is less than (or greater than) the speaker power impact?
Amplifier power small cause field sound pressure is insufficient, often excessive use of power amplifier distortion, damage the power

tube; speaker power is great, if the power amplifier distortion will cause damage to use loudspeakers.
A good speaker, under high power amplifier, show out the sound play, effect is good, but if too much power, will damage the horn, the

appropriate ratio: power amplifier power: the most safe and give play to the sound box power =10:8.
5 equipment how to match the most appropriate?
A. power amplifier and speaker of the ratio should be appropriate
B. field volume size, sound pressure ratio, power ratio, sound box number ratio should be appropriate
The C. activities of the guests position, the positioning of the speakers, reflection, the scene of the resonance, resonance...

Decoration sound-absorbing, sound insulation condition;
D.20 square meters of space, generally applicable to the use of appropriate singing, the sound pressure of 89dB - 93dB; apparent volume

the size of sound pressure increase or decrease calculation.
E. needs to match the appropriate microphone
6 why will produce howling, the impact on the equipment?
The frequency of feedback, power amplifier circuit to handle bad will squeak, especially KTV space is small, the sound pressure and

frequency of reflection four channeling the most difficult to deal with, equipment system good for MIC, amplifier, speakers are

emphatically in this case,
A. instant high sound pressure, howling, tweeter damage, damage or power amplifier;
B. long time high sound pressure howling, will damage the power fuses, relays, power tube and damage, tweeter, so the equipment

reasonable collocation is very important
The 7 power amplifier power is greater, have what effect?
Power amplifier power is greater, of course the sound expression will be full, but when used should be more circumspect, the

engineering requirements are higher, if the engineering experience, the failure rate is high, especially the fuse and the power tube

high damage rate.
8 why the amplifier in the field when there is fault phenomenon, but get treatment said no problem?
A. contractors should self check whether really belongs to the power problem
B. test speaker cable, audio signal line, the image signal line is normal, short circuit, high voltage? If not removed, use a short

meantime problems will appear.
9 Why relay failure rate high? Whether it is the quality problem?
A. speaker improper configuration
The quality problem of B. project
C. also has some quality problems
10 Why circuit board piece apart?
Engineering is a separate piece; met with small local convenience repair; high dynamic current professional equipment through the

connector to connect to coarse. And the emergence of new audio-visual equipment change rapidly, peripheral equipment interference NEW
The 11 amplifier placed ventilation convection is bad, what effect?
Heat can not convection emissions produced by the body, temperature increases gradually, starting temperature protection circuit, voice

gradually become smaller, the temperature is reduced back to normal, if long time at high temperature, the amplifier will gradually

aging, produce high failure rate.
The 12 amplifier why often relay attracted no action (voltage instability)?
Voltage instability, fluctuation is too large, less than the minimum voltage equipment design through the range of the hold no action.
13 why amplifier often sweat wet it (fan role)?
Power amplifier in the high temperature working, after shutdown due to environmental factors cause the body showed the sweating

phenomenon. If the fan convection, the humidity effect, reduce the aging phenomenon