L7维修指导正式版V1.0

L7维修指导正式版V1.0


目录
一、维修平台/工具/设备准备要求：...................................................................................................................................................................................2
1、平台要求：..................................................................................................................................................................................................................2
2、设备要求：..................................................................................................................................................................................................................2
3、测试工具要求：..........................................................................................................................................................................................................2
4、维修辅助材料/工具需求：........................................................................................................................................................................................ 2
5、常见维修备用物料需求：..........................................................................................................................................................................................2
二、维修要求：....................................................................................................................................................................................................................2
三、治具制作及注意事项....................................................................................................................................................................................................2
四、原理概述........................................................................................................................................................................................................................3
1、L7 运算板工作结构：.................................................................................................................................................................................................3
2、L7 运算板升压电路：.................................................................................................................................................................................................5
3、L7 芯片信号走向：.....................................................................................................................................................................................................6
4、整机架构：..................................................................................................................................................................................................................6
五、运算板常见不良现象及排查步骤................................................................................................................................................................................7
1、现象：单板测试检测芯片为 0（
PT1/PT2 站别）....................................................................................................................................................7
2、现象：单板检测芯片不全（
PT1/PT2 站别）.........................................................................................................................................................10
3、现象：单板 Pattern NG ，即回复 nonce 数据不全（
PT2 站别）.......................................................................................................................11
4、现象：P:NG（
PT2 站别）........................................................................................................................................................................................13
5、现象：Sensor NG）................................................................................................................................................................................................. 13
六、控制板异常..................................................................................................................................................................................................................12
1、不运行........................................................................................................................................................................................................................12
2、找不到 IP....................................................................................................................................................................................................................13
3、无法升级....................................................................................................................................................................................................................13
4、读取运算板失败或少链............................................................................................................................................................................................13
七、整机故障现象..............................................................................................................................................................................................................14
1、整机初测....................................................................................................................................................................................................................14
2、整机老化段................................................................................................................................................................................................................14
3、售后维修....................................................................................................................................................................................错误！未定义书签。
八、其他注意事项..............................................................................................................................................................................................................15

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