PCB reverse engineering is a technical process through which the design and functionality of existing printed circuit boards can be obtained and understood. This process typically involves disassembling and analyzing the original circuit board in order to replicate its functionality or make improvements. In many cases, reverse engineering is used for product replication, repair, upgrade, or intellectual property analysis.

　　The steps include: first, taking photos and recording the circuit board, including the position and connection method of each component. Then, use chemical solvents to remove solder and components from the circuit board, in order to observe the copper foil routing more clearly. Next, recreate the schematic and layout of the circuit board through scanning or manual drawing. Finally, using this information, the same circuit board can be redesigned or manufactured.