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②该电路由模拟晶闸管V906、V904,6.2 V稳压二极管VD915,分压电阻R927、R925,整流、滤波电路VD917、C935组成,对行输出变压器T402的④~⑧绕组灯丝电压进行检测。当某种原因导致行输出电压升高、CRT高压上升时,行输出变压器T402的④~⑧绕组灯丝电压也随之上升,上升后的灯丝电压经VD917整流、C935滤波、R927、R925分压后的电压高于VD915的稳压值6.2 V时,VD915被击穿,将高电平触发电压加到模拟晶闸管V906的基极,模拟晶闸管被触发导通,将待机控制POW电压拉低,进入待机保护状态。
② The circuit consists of analog thyristor V906, V904, 6.2 V Zener diode VD915, divider resistors R927, R925, rectifier, filter circuit VD917, C935 composition of the line output transformer T402 ④ ~ ⑧ winding filament voltage test. When a certain reason causes the output voltage of the line to rise, when the CRT high voltage rises, the filament voltage of the winding output voltage of the line output transformer T402 also increases. The rising filament voltage is rectified by VD917, filtered by C935, and divided by R927 and R925 Of the voltage is higher than the regulated value of VD915 6.2 V, VD915 breakdown, the high trigger voltage is applied to the base of the analog thyristor V906, the analog thyristor is triggered on, the standby control POW voltage down into the standby Protect status.