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故障现象:自动搜索时有图像出现,但不能存储,搜索完毕屏幕显示PASS,遥控等其他功能正常。分析与检修:自动搜索不能存储的主要原因有:(1)CPU不良;(2)存储器不良;(3)AFT移相中周或图像检波中周故障,CPU不能识别节目调谐的准确点(4)送往CPU的行同步信号故障,CPU不能判断是否收到节目。根据故障现象除自动搜索不能存台外,其他各功能正常。开机时各模拟量能保持原来状态,说明CPU基本正常,存储器基本正常。用万用表直流电压档测CPU(D1001)(36)脚电压为4.6V,在自动搜索时此
Symptom: Automatic search images appear, but can not be stored, search finished screen displays PASS, remote control and other functions are normal. Analysis and Overhaul: Automatic search can not store the main reasons: (1) CPU failure; (2) memory failure; (3) AFT phase shift weeks or image detection week failure, CPU can not identify the program tuning accurate point (4 ) Sent to the CPU line synchronization signal failure, the CPU can not determine whether to receive the program. According to the symptoms in addition to automatic search can not save the station, the other functions are normal. When starting up, each analogue can maintain the original state, indicating that the CPU is basically normal and the memory is basically normal. With multimeter DC voltage filer CPU (D1001) (36) pin voltage is 4.6V, in the automatic search this