- Oct 13, 2017 -
PCB board debugging method
For just come back to the new PCB board, we first want to look at the board, whether there is a problem, for example, whether there are obvious cracks, with or without short circuit, open circuit and so on. If necessary, you can check whether the resistance between the power supply and the ground is large enough.
For a new design of the circuit board, debugging often encounter some difficulties, especially when the board is relatively large, more components, often unable to start. But if you master a reasonable set of debugging methods, debugging will be more with less.
PCB board debugging steps
1, just come back to the new PCB board, we first want to look at the board, whether there is a problem, such as whether there are obvious cracks, with or without short circuit, open circuit and so on. If necessary, you can check whether the resistance between the power supply and the ground is large enough.
2, and then is to install the components. Independent of the module, if you do not grasp to ensure that they work properly, it is best not to all installed, but part of the installed (for a relatively small circuit, you can all installed), so easy to determine the fault range, Free to encounter problems, no way to start.
In general, you can put the power part of the first installed, and then power on the detection power supply output voltage is normal. If you are not sure when you are powered up (even if you have a great deal of confidence, it is recommended that you add a fuse, just in case), consider using a regulated power supply with current limiting.
First set the current overcurrent protection current, and then the voltage regulator voltage slowly to increase, and monitor the input current, PCB input voltage and output voltage. If the process of upward, there is no over-current protection and other issues, and the output voltage has reached a normal, then the power section OK. Instead, turn off the power, find the point of failure, and repeat the above steps until the power is normal.
3, then gradually install the other modules, PCB each installed a module, on the power test, power is also in accordance with the above steps to avoid the design error or / and installation errors caused by overcurrent and burn the components.