Step 1 : When there is no chip on the locking seat,input the type of 25XX in “Enter Chip Printing”; ![](https://box.kancloud.cn/43456bef74f75ac2a1c75bfa120bf048_462x202.png) Step 2 : Click![](https://box.kancloud.cn/fe21f1eb1da4098cfe19051b2dbeaa6a_112x36.png),it will hint that there is no chip or the locking seat hasn’t been impacted well,which is normal; ![](https://box.kancloud.cn/a78b99241d898bca6d5f49b475919086_381x147.png) If it hints that there may be a pin empty solder; ![](https://box.kancloud.cn/fd11fa8ead2ea52b35d666d2ac94b230_393x162.png) Attention : In the case of that some users have no test board,as long as the selftest 0 and 25 chip test pass,the machine is normal. If there is other hints when doing selftest 0,the way to deal with it could be as following: ![](https://box.kancloud.cn/f62745e69f9b5a93ea84a50e38cff41f_497x157.png) The problem of connection with computer and the programmer,please step-by examine according to the hint of failure process; ![](https://box.kancloud.cn/6d004259bee39b259cd458ab0bde0340_491x112.png) Hardware trouble like pin electric leakage,problems inside the pins,VPP open circuit,GND open circuit,VPP short circuit,VCC short circuit,GND short circuit,VPP protection not shut off,which must be returned to factory to repair.