During the period from the early stage of reform and opening up to the end of the 1980s, due to the huge gap in technology level, China relied mainly on foreign engineers for the maintenance of electronic devices for imported equipment. The desire to increase the utilization of imported equipment and reduce maintenance costs has created a special business opportunity which is the Printed Circuit Board Reverse Engineering Cause.
During this period, technicians made PCB spare parts by manually reverse engineer the printed circuit board schematic diagram. For equipment without schematic diagrams or complex PCBs, it was basically uneconomical and could not be repaired.
In the mid-1990s, PCB testers began to be used for electronic repair in China. Due to the practical limitations of the PCB tester, if it is not possible to make breakthroughs in the recovery of pcb board schematic diagram technology, it is difficult to be widely used as a general-purpose instrument. It is currently only used in a large number of large state-owned enterprises, institutions and military departments. At present, the products similar with PCB reverse engineering technology mainly include PCB board copying software and PCB tester.
At present, neither the reverse engineer project based on the circuit board cloning technology nor the maintenance process based on the PCB tester does not have the automatic generation function of the schematic diagram. These two products are only some of the functions that implement PCB reverse engineering, and the functional effects have yet to be further improved. Their solution to the invisible circuitry pattern in the middle layer is to polish the printed circuit boards, that is, they are based on the destructive measurement of the printed circuit board and belong to the contact pcb board reverse engineering technology.
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