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故障原因分析:故障系因C745间接取样滤波电容漏电变值,使取样电压下降↓→流入误差放大器V745基极偏流减小↓→V745(PNP型管)c极电压↓→V725b极电压↓→V725(NPN管)c极电压↑→V726b
Analysis of the cause of the malfunction: The fault is due to C745 indirect sampling filter capacitor leakage variability, the sampling voltage drop ↓ → into the error amplifier V745 base bias current decreases ↓ → V745 (PNP tube) c pole voltage ↓ → V725b pole voltage ↓ → V725 (NPN tube) c pole voltage ↑ → V726b