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现象;水平一条亮线。该机行场振荡、行场激励均由集成电路IC301(TA7609)来完成,场扫描输出采用的是电容充电式泵电源输出电路,目的是满足场逆程所需要的高电压,减小功耗,使用了双电源供电方式。检修;测量场输出管Q306集电极电压,正常情况下为60V,实测值高达105V,V_c的上升表明没有场激励脉冲信号输入,致使场输出管截止。IC301⑦
Phenomenon; level of a bright line. The machine field oscillation, field incentives are integrated circuit IC301 (TA7609) to complete the field scan output capacitor charging pump power output circuit, the purpose is to meet the needs of high field reverse voltage, reducing power consumption , Using a dual power supply. Overhaul; measuring field output tube Q306 collector voltage, normally 60V, the measured value up to 105V, V_c rise indicates no field excitation pulse signal input, resulting in field output tube cut-off. IC301 ⑦