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问题:一台46cm(18英寸)LC863528C-55K7+LA76810A杂牌机,出现自动搜台不存台(即台号不增加),用微调调整后可正常播放,但有时会出现跑台的故障。检修:按经验分别试换了中周和高频头,故障依旧。测量LA76810A的⑩脚(AFT输出)电压,发现在搜台时在0～0.5V间变化(正常应该在0～4.5V间变化)。检查LA76810A的⑩脚到CPU(LC863528C-55K7)⑩脚(AFT输入)线路上只有两只电阻R113、
Question: A 46cm (18 inch) LC863528C-55K7 + LA76810A brand-name machine, automatic station search does not exist (that is, the station number is not increased). It can be played normally after fine adjustment, but sometimes there is a problem with the treadmill. Overhaul: According to the experience of the trial for the weeks and tuner head, the fault still. Measuring LA76810A ⑩ feet (AFT output) voltage, found in the search station changes in 0 ~ 0.5V (normal should be between 0 ~ 4.5V change). Check LA76810A ⑩ feet to the CPU (LC863528C-55K7) ⑩ foot (AFT input) line only two resistors R113,