Weak current College】 【public broadcasting amplifier failure analysis and elimination of.

<br> Amplifier for basic processing methods <br> <br> 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> <br> 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> <br> 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> <br> If the 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, namely cleanup and guarantee contact correctly, tighten fastening screws. <br> <br> Splash protection lights: .first universal table measuring whether a contrant to short-circuit, resistance is lowered (normal is not less than 30 Ω) if out-of-line machine, namely to distinguish normal resistance to amplifier failure, namely to post checks. <br> < .br> Sound when there might be a small phenomenon lies in the possibility of: <br> <br> 1, bad signal lines; <br> <br> 2, potentiometer bad; <br> <br> 3. signal coupling capacitor .; <br> <br> 4, the feedback resistor is bad, etc. <br> <br> In measuring amplifier Board normal circumstances no sound are: <br> <br> 1. signal is blocked or coupling capacitor circuit; < .br> <br> 2. lead-free power supply, power measurement; <br> <br> 3. volume potentiometer bad; <br> <br> 4, magnifying IC bad wait appears this fault. <br> <br> .As pure power amplifier sound distortion, defective parts: <br> <br> 1. power tube soft breakdown; <br> <br> 2, voltage, positive and negative voltage or a low; <br> <br> 3, resistance .varying values, etc. <br> <br> Sound level lights do not work properly: <br> <br> 1, the first measure voltage is normal; <br> <br> 2, then measuring signal is sent to; < .br> <br> 3. measuring components for damage. <br> <br> Treble bass tuning has not: <br> <br> 1, potentiometer is normal; <br> <br> 2. voltage is normal; <br .> <br> 3, the resistor is normal; <br> <br> 4, the line is connected or bad; <br> <br> 5. solder joints are soldered and welded. <br> <br> <br> .<br> <br> <br>.