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一、修M11机芯(金凤C47S2A)电源的一段弯路故障现象:光栅缩小且又不稳。分析与检修:初步判断为电源有问题。开盖检查+B电压只有80 V左右且不稳,57 V和16 V的两组电压亦成比例下降。调R811最高只能调到95 V,R816上的压降只有1.2 V(正常时应有1.8—2 V左右),显然是电源不正常。据理论和经验:一是行逆程脉冲没有加到Q801的b极,可能是R817或C813与这段铜箔
First, repair M11 movement (Jinfeng C47S2A) power section of the detour phenomenon: grating narrow and unstable. Analysis and Maintenance: The initial judge as a power problem. Open cover check + B voltage is only about 80 V and unstable, 57 V and 16 V of the two sets of voltage also decreases proportionally. Transfer R811 can only be transferred to the maximum 95 V, R816 only 1.2 V drop (normal should have about 1.8-2 V), apparently the power is not normal. According to theory and experience: First, the reverse pulse is not applied to Q801 b pole, it may be R817 or C813 and this section of copper foil