Seektronics

  Bare plate welding test procedure   1. After the circuit board is obtained, it is necessary to observe whether the circuit board circuit is damaged or not, and whether the welding plate is damaged or not.   2. Use a multimeter to measure whether there is short circuit between the power supply and the ground and between different power sources;   3, welding the first part of the power supply, and the power debugging successfully;   4. Weld the CPU and peripheral resistance, crystal oscillator and reset circuit again, and test the power supply and ground again after welding to avoid short circuit and thermal breakdown during welding;   Test after welding CPU: It is necessary to confirm that the crystal oscillator can start normally and reset normally. The program can be downloaded and simulated. When debugging, ensure that the corresponding IO port can be set.   IO port can be directly set to light the LED light.   5. Welding SDRAM and debugging.   6. Weld the serial port and connect i