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故障现象:图像整体向右移位,左边有3cm垂直黑边(无信号时无黑边)。分析检修:开机后伴音正常,图像虽然正常但整幅画面向右移位约3cm。说明故障在行振器及行频自动频率控制(AFC)电路。调节行频旋钮也调不到正确位置,说明行振荡器无故障。再查行频自动频率控制(AFC)电路中的一些主要元件,测得9R_(10)、9C_6都是好的,同时测得行频比较电压也正常。再查鉴相器,测得9BG_2、9BG_3是好的。当测到9BG_1(3DG8)时,发现集电极电压力5V(正常应为10.5V)、发射极电压为5V
Symptoms: the whole image to the right shift, the left 3cm vertical black edge (no black border without signal). Analysis and maintenance: boot sound normal, although the normal image but the whole picture to the right shift of about 3cm. Describe the fault line oscillator and line frequency automatic frequency control (AFC) circuit. Adjust the line frequency knob also tune to the correct position, indicating that the line oscillator without failure. Then check the frequency of automatic frequency control (AFC) circuit in some of the major components measured 9R_ (10), 9C_6 are good at the same time the measured line frequency comparison voltage is also normal. Re-check phase detector, measured 9BG_2, 9BG_3 is good. When measuring 9BG_1 (3DG8), the collector voltage was found to be 5V (normally 10.5V) and the emitter voltage was 5V