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一、常见故障三例例1 故障现象:无彩色,无字符显示,黑白图像和伴音正常。分析与检修:该机的解码块为CD7698CP,CPU为CH01001(TMP47C433AN的掩膜块),字符显示块为TC9020P—003。解码电路和字符显示电路正常工作时都需要引入行脉冲。两部分电路都不能正常工作,很可能是两者共需条件:即行脉冲没有引入,应首先检查行脉冲信号引入电路的共同部分(相关电路见图1)。
First, the common failure of three cases 1 Failure phenomenon: no color, no characters, black and white images and sound normal. Analysis and maintenance: The machine decoding block CD7698CP, CPU CH01001 (TMP47C433AN mask block), the character display block TC9020P-003. The decoding circuit and the character display circuit need to introduce line pulse during normal operation. Two parts of the circuit can not work properly, it is likely to be both conditions: the line pulse is not introduced, should first check the line pulse signal into the common part of the circuit (related circuit shown in Figure 1).