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例1.故障现象:无光栅,无伴音。分析检修:经查保险管FV_(801)电阻R_(801)、厚膜块HM8951B、开关管V_(801)2SD820、电阻R_(119)都已损坏。C_(820)在图中标明是1.5pF/500V.而被一只1500pF的瓷片电容代换.经测该电容正常。所以笔者还是用这个电容代替C_(820)。而其他损坏件均换上新件。开机后118V电压升高到150V。屏幕上出现了一会儿光栅。突然“啪”的一下光栅没有了,而保险管、
Example 1. Symptoms: no grating, no sound. Analysis and Maintenance: After checking the fuse FV_ (801) resistor R_ (801), thick film block HM8951B, switch V_ (801) 2SD820, resistor R_ (119) have been damaged. C_ (820) is marked as 1.5pF / 500V in the figure, replaced by a ceramic capacitor of 1500pF. The capacitance is normal. So I still use this capacitor instead of C_ (820). Other damaged items are replaced with new ones. After turning on the voltage of 118V rises to 150V. A raster appears on the screen. Suddenly “snapped” about the grating is gone, and insurance tube,