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(1)断开开关管的方法按图2所示的断开STR-5412内开关管方法的示意图。将STR-5412连同散热片从电路板上拆下来,在距引脚11mm处,沿两个固定孔横轴方向,用钢锯条向下锯约2mm深,如图2中所示。可采用边锯边测量②脚与④脚间正、反向电阻值的方法,当测得电阻值为∞时,说明其内的开关管基极已与其他电路脱开了。(2)加接开关管的方法将STR-5412的①脚齐根剪去,另取一只PCM≥50W、图2断开STR-5412内开关管方法的示意图
(1) The method of disconnecting the switch tube The method of disconnecting the switch tube in STR-5412 according to FIG. 2 is shown. Remove the STR-5412 with the heatsink from the circuit board and saw it down about 2 mm deep with a hacksaw blade along the horizontal axis of the two fixing holes at a distance of 11 mm from the pin, as shown in FIG. 2. Can be used to measure the edge sawing ② feet and ④ feet between the positive and negative resistance value method, when the measured resistance value is ∞, indicating that the base of the switch has been disconnected from other circuits. (2) plus the method of switching the STR-5412 ① feet Qigen cut off, the other to take a PCM ≥ 50W, Figure 2 STR-5412 disconnect the switch within the schematic method