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机型:青羊35D2—2G 黑白电视机故障现象:光栅时有时无,伴音正常。故障分析与检修:本机伴音正常,说明该机电源电路、公共通道电路工作正常.故障可能是行、场扫描电路,但行扫描电路可能性又最大。又因光栅时有时无,又必须考虑行振荡电路。首先查关键点电压。测行管 C 极电压为14V(正常值为28伏),故怀疑自举升压电路。用 R×1K 档测提压二极管和提升电容正常。激励电路是否电流过大或激励不足,用万用表测得激励
Model: Qingyang 35D2-2G black and white TV Symptom: sometimes no grating, sound normal. Failure Analysis and Maintenance: The sound of the machine is normal, indicating that the machine power circuit, the common channel circuit is working properly. Failure may be line and field scanning circuit, but the possibility of line scanning circuit and maximum. And sometimes because of the grating, but also must consider the line oscillator circuit. First check the key point voltage. Bank trip tube C voltage is 14V (normal value of 28 volts), it is suspected bootstrap boost circuit. With R × 1K file booster diode and boost capacitor normal. Whether the excitation circuit current is too large or insufficient incentives, measured with a multimeter incentives