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故障现象:摇控器功能键及面板功能键失灵。开机后能收到(上次关机前)某一频道节目,且图像、伴音均正常,但用摇控器或面板功能键均不能改变当前状态,只有在按住面板某一功能键再用摇控器操作时才能改变当前状态(如:调台,改变色饱和度、亮度等)。分析与检查:用面板上任一功能键和摇控器同时操作时能实现各功能的操作,说明摇控器、红外接收器均正常,中央处理器(M34300N4—012SP)也正常。故障可能在:①中央处理器不能接收复位信号,因此不能改变当前状态;②4MHz晶体振荡器停振,使中央处理器不工作。按住面板上某一功能键时,仅仅是给中央处理器一个触发信号,使晶振振荡,同时中央处理器内
Symptom: remote control function keys and panel function keys failure. After powering on (before the last shutdown), a certain channel program is received, and the picture and sound are normal. However, neither the remote control nor the panel function keys can change the current status. Only by pressing a certain function key on the panel and then using the function key When the controller is operating, the current status can be changed (such as adjusting the desk, changing the color saturation, brightness, etc.). Analysis and Inspection: When using any of the function keys on the panel and the remote control to operate at the same time, the operation of each function can be realized. The remote control and infrared receiver are normal, and the central processing unit (M34300N4-012SP) is also normal. Failure may be: ① central processor can not receive the reset signal, so can not change the current state; ② 4MHz crystal oscillator stop vibration, so that the central processor does not work. Hold down a function key on the panel, just to the central processor a trigger signal, the crystal oscillation, while the central processing unit