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Common Malfunction And Elimination Method Of DC Power Adapter

               Common trouble and elimination method one, the line fault line fault, including the power line damage does not power, contact mouth oxidation contact and so on. The emphasis is on checking the input line and the output line for power. If the line fault, can be solved by replacing the power cord.

               Second, the output voltage is too low to cause the output voltage of the main reasons: 1 switching power supply load short-circuit fault (especially the DC/AC converter short-circuit or poor performance, etc.), at this time, first disconnect the switching power supply circuit of all the load, check is the switching power supply circuit or the load circuit failure. If the load circuit is disconnected and the voltage output is normal, the load is too heavy; the switch power supply circuit is faulty. 2 Output voltage end filter Capacitor or rectifier diode failure, etc., can be judged by the substitution method. 3 The performance of the switch tube, resulting in the switch tube can not be normal conduction, so that the internal resistance of the power increase, load capacity drop. 4 Switch transformer is not good, not only caused the output voltage drop, but also caused by the switch tube excitation is not enough to damage the switch tube 5 300V filter Capacitor bad, resulting in a poor load capacity, a load output voltage will be reduced.DC Power Adapter

               Third, excessive output voltage output voltage is generally from the voltage regulator sampling and voltage control circuit. In the DC output, sampling resistance, error sampling amplifier such as TL431, Optocoupler, power control chips and other circuits together composed of closed control loops, any one of the parts problems will cause the output voltage rise.DC Power Adapter

               Four, the safety of normal, no output voltage insurance tube normal, no output voltage indicates that the switching power supply is not working or entered the protection state. The first step is to check the power control chip start the boot voltage value, if there is no start-up voltage or low starting voltage, then check the start of the device and the start of the resistance of the components and whether the electrical leakage. If the power control chip is normal, the fault can be detected quickly by the above monitoring. If there is a start-up voltage, then the output of the measurement control chip at the start-up moment whether there is a high, low-level jump, if no jump, indicating that the control chip damage, peripheral oscillation circuit components damaged or protection circuit is faulty, by replacing the control chip, check the peripheral components, to check each;DC Power Adapter

              The insurance burns out or blows up the main inspection rectifier bridge, each diode, the switch tube and 300 volts on the large filter capacitor and so on. Causes the insurance to burn, The Blackening, may also be the anti-interference circuit to cause the problem. Especially noteworthy is: because the switch tube breakdown causes the insurance to burn, usually will burn out the power control chip and the current detection resistance. Thermistors are also easily burned with insurance.DC Power Adapter

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