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在安装天线放大器时,突然出现记录与重放无彩色,无E-E信号(即收不到电视台信号输出)的故障。此时拨通录像机测试信号开关,电视屏幕可出现正常的测试信号,这说明射频组件工作正常。显然,上述故障是由于机器内部E-E开关没有被接通和色度通道故障引起的。这时检查IC_(014)脚发现无电-电状态(即E-E状态)和放像状态切换控制信号输入再检查相关的Q_(046)及其周围电路未发现问题。进一步检查
In the installation of antenna amplifier, suddenly appeared in the record and playback without color, no E-E signal (that is, can not receive television signal output) fault. At this point dial the VCR test signal switch, the TV screen can appear normal test signal, indicating that RF components are working properly. Obviously, the above fault is due to the internal E-E switch is not connected and the chromaticity channel fault caused. At this moment, check IC_ (014) feet found no electricity - electric state (ie E-E state) and playback state control signal input re-check related Q_ (046) and its surrounding circuits found no problem. Further examination