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故障现象:开机“三无”。分析与检修:开壳后测+B端对地电阻,正、反向均为4Ω,断开“行管”集电极后,+B处电阻值恢复正
Symptoms: boot “three no ”. Analysis and Overhaul: After open-shell test + B-side resistance to ground, positive and negative are 4Ω, disconnect the “row tube” collector, + B at the resistance value recovery is positive