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例8 华声3DK770型VCD机显示及检测正常,但面板及遥控控键均失控。分析与检修:该故障原因主要发生在红外线遥控接收头或微处理器电路,因为VCD机上的面板操作指令和遥控器按键指令一样均须先进行编码,然后再将电信号经机内的红外发光二极管转换成红外光信号,由红外线接收头接收后送入微处理器进行操作系统控制。因此,如果红外线接收头或微处理器出故障均令造成上述现象发生。打开机盖,先检查红外线接收
Example 8 Vocoder 3DK770 VCD display and detection is normal, but the control panel and remote control are out of control. Analysis and Maintenance: The cause of the malfunction occurs mainly in infrared remote control receiver or microprocessor circuit, because the VCD console commands and remote control buttons must be encoded, and then the electrical signal through the machine’s infrared light Diode converted into infrared light signal, received by the infrared receiver into the microprocessor for operating system control. Therefore, if the infrared receiver or microprocessor failures are caused by the above phenomenon. Open the cover, first check the infrared receiver