Weak current College】 【sound reinforcement system equipment maintenance methods! --- Power By】 【China power house network.

<br> 1. Visual inspection method <br> Visual inspection method is disconnected immediately after the power supply. No instruments, meters, with an intuitive feel, mobilization of Visual, auditory, olfactory, tactile, and other characteristics, 4 feeling. The .check method while poor accuracy, but speed, Visual inspection method especially for power failure checking is useful. <br> A look at the observation of the machine or unit and external structures. See the key switch, interface, LEDs have no loose, there .is no Circuit Board received Ogata, with and without virtual welding, discoloration, cracks, burst and other phenomena, there is no blow the fuse, fire, smoke, deformation, not stuck, use the eyes, the direct recognition and judgment. <br .> 2 listen to gently turning the machine or unit, swing swinging, listen to any parts scattered or screw off, is there a rattle. There are continuous flipping all normal "Squeak" or "splat splat" brand impact sound (power). If .you have these phenomena, the fault may occur in these places. <br> Three reports with the nose has no smell the burning smell, odor source is found, the fault may emit smell. <br> 4 touch the hands touch transformer shell ( .powered), do not touch the connection terminals, because sometimes because charging capacitors, high voltage, endanger safety. Feel it, whether over the normal temperature, Perm, can't touch. Power tube is not too hot or cold. Adjustment of possession .without excessive heat or cold is not hot. If you have these phenomena, the problem may occur in these places. <br> Second, the heuristics <br> Heuristics for suspect part of the circuit using comparison, segmentation, alternative, simulation, and .so on means of finding fault, and then exclude. Specific methods are as follows: <br> 1, comparison to find one and fault-exactly the same type of machine, professional equipment using the same machine of left and right channel parts, measurement .corresponds to the part of the voltage, resistance, current, and then to compare, locate the fault lies. <br> 2, split a part of the circuit and the other parts of the undocking, connected to the power, the injection signal. .<br> 3. replacement of components with a good substitute for suspected component, or to the left and right channel parts swap, especially for integrated circuit block can be carried out. If the part on heat exchanger after the machine back to normal, the .parts problems or damage. <br> 4. analog temperature simulation, hair dryer, heating, or cooling down with alcohol, carry out checks the temperature performance, vibration simulation is the use of thin plastic insulated Rod tap some parts, see circuit working conditions ., you can find some virtual welding phenomena, the check is located. This approach is generally carried out by technical players, prone to failure exacerbation. <br> Third, the static parameter measurement <br> Measurement of static parameters must be in possession of .the manufacturers of production equipment of the maintenance manual, specify individual components, static endpoint operating current or voltage, using a multimeter measuring circuit parts of current, voltage or resistance value and see whether or not the nominal value. <br> 1. resistance measurement .<br> Multimeter for ohm stalls × 100 or × 1K stalls, do not use R × 10K stalls because it stalls on the ammeter inscribed 22.5 volt battery, measurement of the transistor, the transistor is easily damaged. In case of power failure, if .any charge to measure capacitors, the screws must be insulated from cone full discharge. Measurement of line resistance must be welded open end, otherwise inaccurate measurement. <br> 2. voltage measurement <br> In the measurement process to consider the internal resistance of .the measured value multimeter. Static measurement and dynamic measurement values (joined signal) is not the same, it should be noted. Measurement of static PIN when the transistors, resistors, capacitors Terminal voltage is consistent with the nominal value, the transistor feet relative voltage .can judge whether the damage to the pipe. <br> 3. current measurement <br> Direct measurement, the ammeter series into the circuit, check the current size. Using indirect measurement, the measuring voltage, with resistance values from voltage values, obtaining .current value size. <br> In addition to the static parameter measurements, you can use dynamic inspection method, using the signal source and the oscilloscope, signal directly to check on the circuit. This approach is direct, accurate, and not easily damaged components ., but also on the circuit and mechanical structures for adjustment and calibration..