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故障现象:金星C37—401型彩电开机后,屏幕上、下部各有1/3无光栅和图像,即出现宽银幕状态,色彩及伴音正常。分析检修:根据上述故障现象,可确定是由于场幅度过小或不足所致。应重点检查有关影响场幅的电路。首先查整机直流输出C909端电压为+108V,正常;再查提供给场电路工作的C_(909)端电压为+54V,也正常。用起子调节场幅度可调电阻器R_(610)川(V·SIZE),正
Symptom: Venus C37-401-type TV boot, the screen, the lower part of 1/3 without grating and images that appear widescreen state, color and sound normal. Analysis and maintenance: According to the above symptoms, it can be determined due to the field amplitude is too small or inadequate. Should focus on checking the impact of the circuit. First check the machine DC output C909 terminal voltage is +108 V, normal; C_ (909) for the field circuit to check the voltage of + 54V, it is normal. Adjustable field amplitude with a screwdriver Resistor R_ (610) Sichuan (V · SIZE), positive