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一、故障现象开机时,系统POST检测程序检测1024KB内存正常,之后试图启动硬盘、自举系统,盘驱动器被选指示灯亮,但不能从硬盘中读出数据,而且指示灯一直亮着。约过三分钟后,检查程序认为无法从硬盘中自举系统,则从软盘驱动器A中自举系统。与硬盘一样,A驱动器指示被选,同样举不起系统,至此,A驶动器指示灯常亮,系统“死机”,而且每次开机故障现象一样。二、故障分析和处理笔者对该故障首先采用了原理分析法进行分析。从故障现象看,POST能检测完1024KB内存,并显示正常,说明主CPU-80286及主存储体、外围的数据、地址、控制信号的“瓶颈”没故障。CPU的地址、数据和命令线经测试均未处在第三态,说明总线响应逻辑电路部分基本正常。系统能对硬盘和软盘在不同的时刻进行启动,试图自举起系统,但都遭失败。原因很
First, the fault phenomenon At boot time, the system POST detection program to detect 1024KB memory normal, then try to start the hard disk, boot the system, the disk drive is selected indicator light, but can not read data from the hard disk, and the indicator has been lit. After about three minutes, if the checker finds it impossible to boot the system from the hard disk, boot the system from floppy disk drive A. As with the hard disk drive, the A drive indicator is selected and the system can not be lifted. At this point, the A-pilot light is on and the system “crashes”, and the fault occurs every time. Second, the failure analysis and processing I first used the principle of the fault analysis. From the symptom, POST can detect the end of 1024KB memory, and display normal, indicating the main CPU-80286 and the main memory, peripheral data, address, control signal “bottleneck” is not a malfunction. CPU address, data and command line are not tested in the third state, indicating that the bus response logic part of the basic normal. The system can boot the hard disk and floppy disk at different times in an attempt to bootstrap the system but failed. The reason is