Last week, one friend asked to go with him and buy a Toshiba M105 M115 AC adapter. As I often bought from the internet. And there is very detailed information. This time we went to the store to have a look. And the four steps below are helpful through this experience.
Visual inspection
As the good quality Toshiba M105 M115 AC adapter has dedicated appearance. So carefully check the power of the heat sink is large enough or not. Another point is to check the power cable is thick enough structure, because the power supply output current generally greater resistance of very small point drop would have a great loss, good quality power cables are relatively thick, cable line quality are better.
Check the heat sink material
Heat sink from view, are generally of good quality name brand power using aluminum or copper heat sink, and a large children thick heat sink. Although low-grade power with aluminum or brass, but the heat sink is small and thin. Sometimes bad products use metal plates as heat sinks; in general these are fake and shoddy products.
Do some simple tests
The first method is to simply test the load drop, which drop the smaller power supply better quality. But never in the course of the experiment at 12 V, -12 V to do, would it burn the power. The second method is to connect the power supply is not the case ground, hand-to-power case (no risk), there should be a sense of shock Ma hand, because the power supply starts the shell about 110 volts AC on voltage. The third approach is to listen to the voice of power supply fan, power supply fan running in the load is small and uniform operation of the sound (connected to the load is increasing fan sound).
Finally, my friend got a new under this circumstance. Next time you want to get a new replacement, you can follow these steps.
Toshiba M105 M115 AC adapter