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下面以夏普29S1—A1型彩电为例,介绍其引脚功能、外电路说明及检修数据。应用电路如图1所示。 1.CPU的工作条件 (1)电源端:(42)脚是CPU5V供电端。是由开关电源提供的12V电压,经R1061限流、D1102稳压后得到5V电压。 (2)复位端:①脚是CPU复位信号输入端。采用低电平复位,复位信号由R1027、C1013、D1020提供,复位后,该脚电压为4.2V。
The following to Sharp 29S1-A1-type TV, for example, describes the pin function, external circuit description and maintenance data. Application circuit shown in Figure 1. 1.CPU working conditions (1) Power: (42) feet is CPU5V power supply terminal. Is provided by the switching power supply 12V voltage, R1061 by the current limit, D1102 5V voltage regulator. (2) Reset: ① feet CPU reset signal input. Using low reset, reset signal provided by the R1027, C1013, D1020, reset, the pin voltage is 4.2V.