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故障现象1:无规律性自动关机。分析与检修:首先判断是电源电路,还是行扫描或其他电路出故障。将L405电感断开,接上假负载(100W灯泡代替),观看灯泡是否发亮,通电试机,灯泡不亮,说明故障发生在电源电路。将V406、C2594、V407、C2594、V404、C1569取下检查都是好的。通电手摸开关管V401无温度变化,维修陷入困境。最后考虑是不是V401(C4111)无放大倍数?以前维修其他机器遇见过此
Symptom 1: irregular automatic shutdown. Analysis and Maintenance: First determine whether the power circuit, or line scan or other circuit failure. The L405 inductor disconnected, connected to the fake load (100W bulb instead), watch the light bulb is lit, power test machine, light bulb does not shine, indicating that the fault occurred in the power circuit. V406, C2594, V407, C2594, V404, C1569 remove the check is good. Power switch touch switch V401 no temperature changes, maintenance in trouble. The final consideration is not V401 (C4111) no magnification? Previously repaired other machines have encountered this