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４．判定和排除故障的主要方法（１）观察法。检查故障主板及其它板卡、各插头、插座；跨接线JP４：１－２，JP５、JP１０：２－３；拨码开关JMP－３：２、３、４、６、ON，１、５、７、８、OFF是否有松动及接触不良；各零件之间是否有相碰、打火、烧焦痕迹；印刷线路板上的铜
4. The main method of determining and troubleshooting (1) observation. Check the main board and other boards, plugs and sockets; jumper JP4: 1-2, JP5, JP10: 2-3; DIP switch JMP-3: 2,3,4,6, ON, 7,8, OFF is loose and poor contact; whether the collision between the parts, ignition, scorch marks; printed circuit board copper