subject: the noise from the work of the adapter switching transformer [print this page] remove the measurement model D3SB that the rectifier bridge (Figure 10) is indeed corrupted. When replacing the rectifier bridge, filter capacitor C1 found below the short-circuit-board traces of liquid dry, remove the filter capacitor, saw that it has serious leakage capacitor, the top has to muster out (Figure 11). Replacement of the same size filter capacitor, replaced the fuse again, the adapter is connected to power, the measurement adapter has the normal output of 16V DC voltage output. Safety, maintenance of the power Ac adapterAcer laptop ac adapter adapter after put into use, the best load testing with a false stability of their work. Is: find a resistance heating wire or the power for the 4 resistor connected to the adapter output, close to full capacity so that the adapter 1 to 2 hours, and monitoring the output voltage with a multimeter (Figure 12), if the output voltage has stabilized between the 15.2 ~ 16.8V (ie 16V 5%), the adapter can be considered stable and can be connected to the official use of laptop computers. Example 3: a power adapter at work loud "creak" sound, a place far away from the adapter is also clearly heard, seriously affecting the users of mind. Maintenance process: In general, there is a weak power adapter working noise is normal, but if the noise impact to cause restlessness, then this counted as failures. However, the source of such failures is better to find fault, because the power adapter only switching transformers, inductors, magnetic coils and the coil gap between the big events will lead to "creak" generation. Anatomy adapter, power supply is not the case moving gently pull the two parts of the inductor coil on the coil (marked 3 in Figure 6), found no loose sense, to be sure, the noise from the work of the adapter switching transformer. Work to eliminate the transformer switch the "creak" sound methods are: electric soldering iron a few pins on the switch transformer connection with the printed circuit board solder joints re-welding, welding transformer when the switch by hand pressure to the circuit board, so that switch at the bottom of the transformer in close contact with the circuit board.
the noise from the work of the adapter switching transformer
