The article analyses the reason of retrace line which is produced by changing line output transformer of TV set and its removing method on the basic of color TV set circuit and its working principle.

• 本文根据彩色电视机的电路结构和工作原理,分析了更换高压包引起场逆程回扫线干扰的原因及消除该逆程回归线的方法。