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据用户反映:“先后请两位技术员上门帮忙维修后,使用几天故障依然如故——有时能开机工作,有时无法开机”。打开机盖,发现电源与行部分补焊处理过,而且电源位置的多数电容有换新的痕迹。本机电脑 IC001采用 Z9023306,电源厚膜块 IC601用 STR-S6709,小信号处理电路 IC101用 0M8361。先测+B(140 V)及各路低压正常,机器工作几小时无故障,摇动底板无变化,隔一天多次试机正常,偶尔一次试机真的无法开机,翻动底板要测试 CPU(IC001)的(41)脚,验证开机0 V,待机5 V 时,机器又能正常工作。这时候,感觉要快速找出故障点不容易,分析电路虚焊的可能性小(已补焊
According to the user: “Please have two technicians come to help repair after a few days the fault remains the same - sometimes boot, and sometimes can not boot.” Open the lid and found that the power supply and the line part of the welding repair, and the majority of the power supply location has a new trace of the capacitor. The local computer IC001 using Z9023306, power supply thick film block IC601 STR-S6709, small signal processing circuit IC101 0M8361. First test + B (140 V) and various low-voltage normal, the machine works hours without trouble, shake the floor no change, every several days test machine normal, occasionally a test machine really can not boot, flip the bottom plate to test the CPU (IC001 ) Of the (41) feet, verify boot 0 V, standby 5 V, the machine can work properly. At this time, I feel it is not easy to quickly find the point of failure, analysis of the possibility of solder joint circuit is small