3.场扫描电路故障的检修与常见故障实例分析。场扫描电路的常见故障主要有:水平一条亮线、场幅压缩、场线性不良、场不同步有回扫线等。根据扫描原理,荧光屏上光栅的形成是电子束在行、场偏转磁场的作用下,作水平和垂直扫描的结果。若场扫描电路不工作,在场偏转线圈中无场锯齿波电流通过时,则出现 3. field scan circuit fault repair and common fault instance analysis. Field scan circuit common faults are: level of a bright line, field compression, field linearity is poor, the field is not synchronized with the flyback line. According to the scanning principle, the formation of the grating on the phosphor screen is the result of the horizontal and vertical scanning of the electron beam under the action of the field and field deflection magnetic fields. If the field scan circuit does not work, there is no field sawtooth current in the field deflection coil