2 with a multimeter Find

    In the absence of information, the multimeter to find out. The method is: use a digital multimeter, the file location on the buzzer ( usually diode file ) , with a sheet of copper foil strokes off the pin, and the other leads in the rest of the circuit board pin of paddling, if hear a beep , beep of which is caused by loss of the pin with copper pin connected , then, the desirability of a suitable length of wire, between the two pins connected to .

3 Re- welding

    If two or more valid method , it is possible that this pin is empty legs . But if not empty after foot , could not find foil off at the pin and the pin is connected to which component used a blade to gently scrape off at the circuit board copper foil , scrapings new copper, iron plus available tin pin gently leads to the sealing off pin welding.

4 Control Act

    In the case of conditions , it is best to find a normal aircraft of the same type of circuit boards to compare , measure the junction point of the corresponding normal machine , and then control the shedding of copper connection failure .

    Note that, when the connection portion is connected to distinguish the RF circuit or a logic circuit , in general, logic connection is not disconnected , cause side effects , and often radio connection portion side effects due to RF circuit signal frequency is higher, even on a line, the distribution parameter greater impact , so the RF section is generally not easy to connect , even if you want to connect , it should be as short as possible .