Computer does not have a voice here to teach you how to overhaul

Class A common fault: the silent sound card

1. Speaker power to open it? Speaker line plugged it? If there are headphones, you can use headphones to test.
2. Set up a “mute” it? Click the bottom right corner of the screen voice of a small icon (a small cough叭), appeared to adjust the volume slider below the “mute” option, click the check box in front to clear the mark box.
3. Volume to minimize it? In the above to adjust the volume slider on it dragged up.
4. Is to install a Direct X sound card can not be audible after it? Note that this sound card with Direct X compatibility bad, need to update the sound card driver.
5. Is a silent channel it? Check the sound card to the speaker audio line whether there is disconnected. Check the master volume control panel inside the “Acoustic” and “master volume” button to adjust the balance is in the middle. I once changed the settings on winamp into a channel, and then to come back on the list. There was no audio line interpolation, and also the emergence of a channel.
6. The sound card drivers installed it? Loaded the correct it?

Troubleshooting Class II: the silent speaker

(1) without the voice of the cause of the malfunction: blown speaker voice coil; speaker voice coil wire circuit; feeder road; and amplifier connected properly missed.

(2) the voice of low-fault reasons: poor quality speakers; phase then the anti-woofer.

(3) sound distortion causes: speaker voice coil askew; speaker deviated from the core or the magnetic gap has debris; speaker cone deformation; fed to the power amplifier is too large.

(4) the cause of the malfunction hum: speaker cone rupture; speaker cracking joints; speaker loosening after the board; speaker盆架not fixed tight; speakers face net too loose.

(5) high-frequency difference causes: high-frequency sub-band bad capacitors; bad tweeter unit; surface nets used improperly.

(6) low-frequency difference causes: non-performing sub-frequency networks; bad woofer unit.

(7) the effect of poor stereo failure reasons: speakers placed himself; polarity does not connect the two speakers.

Here for everyone to give an example of maintenance.

Example: the shock wave speaker maintenance

Trouble phenomenon: a pair of shock wave Antimagnetic speakers, rated power 30w, speakers in the course of a sudden no sound.

Fault Analysis: First of all, you checked the speaker’s appearance, has not found any abnormalities, connected power, can hear the humming noise, This shows that the speaker did not burn speaker. Touched the rear speakers, I found that the rear cover is gradually changing scalding. Because the rear speakers at the same time as the heat sink power amplifier chip, so initially identified the speaker amplifier chip is damaged. Cut off power, open the rear speakers to observe the speaker’s power amplifier circuit, did not find circuit components such as resistors and capacitors abnormal signs. Re-connect power, found that apart from the amplifier chip especially hot, the bridge is particularly hot, preliminary judge for the possibility of damage to power amplifier chip larger.

Replacement bridge will bridge the four-pin solder used on the iron and tin suction device to remove. After the replacement of electricity, are still found fault; then amplifier chip for down. TDA1521 amplifier chip and pin with nine more dense, so it’s relatively complicated demolition. First of all, to put amplifier chip on the screw to unload, and then slowly chip solder all pins removed; installation, attention should be paid to each pin on the lining of tin not too much, otherwise easily adjacent to a short circuit caused by pin. The screw in the last chip, it is necessary to pay special attention to the tight, so that chip with the speaker in close connection with the rear cover, so as to achieve a good cooling effect. End chip replacement after troubleshooting.

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