故障现象:有伴音,无光栅,关机瞬间荧光屏上出现如图1所示的瞬时带状光栅。故障检查:本例故障无光栅但有伴音。因为供给通道的12V电源电压是由行输出变压器取得的,由此可判断整机电源电路和行输出电路均工作正常。无光栅现象可能是由于视放输出电路引起的,查三只视放输出管各集电极 Symptom: There are sound, no grating, shut down the momentarily appeared on the screen as shown in Figure 1 instantaneous ribbon grating. Troubleshooting: This example fault without grating but with sound. Because the supply channel 12V power supply voltage is obtained by the line output transformer, which can determine the machine power circuit and the line output circuit are working properly. No grating phenomenon may be due to the visual release of the output circuit caused, check the three put the output tube of the collector