1, reduce the power supply voltage of the audio part, for example: the voltage of the audio part is positive and negative 45V, and use positive and negative 20V voltage to repair, so it is safer. 2, repair the sound circuit must be the power amplifier signal input to the ground short circuit. 3, some audio is not able to remove the power tube repair, the power tube removed, this can not measure the midpoint voltage. The midpoint voltage is either positive or negative.
And the supply voltage is either positive or negative. The relay of the horn protection circuit cannot be drawn at the same time. Note: Buck repair may keep the relay of the circuit from pulling. This is normal. Do not suspect that the midpoint voltage is too high to cause protection. 4, if you are afraid of burning the power tube, you can do this: temporarily use the tube 2SA940, 2SC2073 instead. Because the general home stereo is not partial A.
The static current is not large, will not burn the pipe, but the pipe must be attached to the heat sink. Don't turn it up too loud during the sound check. Check the trumpet. 5, the component parameters on the bias circuit must be accurate. Bias triode pin, tube type must be connected to the right choice. Otherwise, you're gonna have a hard time. 6, the tube \"complementary to the tube\" amplification beta number is basically one to.
Speaker common problems and maintenance methods 1. When the volume is adjusted, there is a crackling sound, which is louder and quieter. Presumably this should be the most common problem encountered by ordinary users, I believe that many users will have such an experience. This problem occurs when adjusting the volume of the stereo after a period of use. Many users simply do not move the sound pulley above the speaker, using the volume adjustment of the computer system to control the sound, which is undoubtedly a stopgap solution, but does not solve the fundamental problem.
Solution: Replace the potentiometer, cost only about 2 yuan, but do it yourself. In addition, the four crimping pieces behind the potentiometer can be opened to reveal the active contact of the potentiometer. Then, clean the carbon block with anhydrous alcohol, and then drop a drop of oil on the carbon block, and then install it to solve the noise problem. 2. The sound can be played, but noise will appear at irregular intervals.
Some users themselves in the market to buy the kind of small speaker or the kind of cottage brand audio is likely to occur this problem, the use of speakers will appear at irregular intervals \"crackling\" noise, sometimes the sound even high-pitched harsh. The sound will be better when you put on the headphones. This makes many novices feel very strange, because everyone will not think of their own software setup problems or their own computer hardware problems at the beginning.
Another possibility is the problem of poor contact of the audio cable connector, so the plug-in technology is implemented. Solution: Very simple solution, throw away the current socket, buy a well-known brand of high-end socket, the problem is solved. The editor reminds you again, don't find a repair shop when you have a problem, no problem will give you a problem.