Weak current College】 【amplifier failure basic processing methods.

<br> <br> ⑴ Radio: check the power cord to the fuse is, whether the power line breaking or fuse bad, fuse blow → ie check Amp Rectifier power rectifier bridge or electrolytic and other components is bad, as rectifier diode or bridge .heap of bad change into better components and then checks the other lines, for example, power amplifier, etc. <br> ⑵ signal level indicator is blinking normal, but no sound output: first checks the driver is functioning, such as normal, ie .check that normal trumpet leader, check the Terminal contact good, normal, ie open chassis the rink or ear has not heard or saw the output relays are snap-action, if the snap-action properly (such as a universal table) that is, .before measuring relays of the input and output is through, such as access to the relay contact oxidation or within striking achievements made, ie for relay charcoal. <br> ⑶ power light indicates the normal no sound output, but hear the sound output pick- .up: the first universal table measuring power amplifier power is normal, as normal, that is signal input signal cable terminals using head and hand pass as heard great current sound that most discriminating power on initial basic normal, that is, light rock the signal if .there is no leader or bad, if it is bad, that is, the universal table measurements is the thread failed processing properly. <br> ⑷ as power amplifier output when no sound output: that is, check the driver's normal, such as Terminal .has no bad and burned, if it is a terminal block burning black, clean and guarantee access to normal, screw fastening screws. <br> ⑸ splash protection lights: first universal table measuring whether a short-circuit the Horn group, resistance is lowered .(normal is not less than 30 Ω) as normal line outside the machine, that distinguish the resistance to the amplifier is at fault, that is, to boot. <br> ⑹ sound when there might be a small phenomenon lies in the possibility of .: <br> 1, bad signal lines; <br> 2, potentiometer bad; <br> 3. signal coupling capacitor; <br> 4, the feedback resistor is bad, etc. <br> ⑺ in measuring amplifier Board normal circumstances .no sound are: <br> Signal is blocked or coupling capacitor circuit; <br> 2. lead-free power supply, power measurement; <br> 3. volume potentiometer bad; <br> 4, magnifying IC bad wait appears this fault .. <br> ⑻ as pure power amplifier sound distortion, defective parts: <br> 1. power tube soft breakdown; <br> 2, voltage, positive and negative voltage or a low; <br> 3, resistance varying values, etc .. <br> ⑼ sounds normal level light does not work: <br> 1, the first measure voltage is normal; <br> 2, then measuring signal is sent to; <br> 3. measuring components for damage. <br> .⑽ treble bass tuning has not: <br> 1, potentiometer is normal; <br> 2. voltage is normal; <br> 3, the resistor is normal; <br> 4, the line is connected or bad; <br> .5. solder joints are soldered and welded. <br> <br> <br>.