One , PCB board profile system concept
PCB board system refers to the process of obtaining a cross-sectional schematic diagram and board (PCB diagram ) based on the original PCB board kind . For the purpose of later development . Late development including the installation of components , deep test, modify circuit. PCB board because they do not belong to the category of cross-sectional and associated system , so do not only describes in detail .
Two , PCB board cross flow system
1 , removal of the device of the original board.
2, the original plate scanning , get a graphics file .
3 , the surface layer was rubbed to obtain the intermediate layer .
4 , the intermediate layer is scanned to obtain a graphics file .
5 Repeat steps 2-4 until all layers are processed.
6 , the use of special software to convert graphics files dossier --- PCB electrical diagram . If you have the right software , designers can simply graphical depiction again .
7, check verification , complete the design .
Three , PCB board skills profile system
PCB board is a cross -sectional system , especially the system of multi-layer PCB board is a time-consuming job, which contains a lot of repetitive work . Designers must have enough patience and careful , otherwise very error prone. The key to doing a cross-sectional design of the system lies in the PCB using appropriate software instead of doing repetitive work, that save time and accurate.
1, the profile system process must use the scanner.
Many designers used to draw lines directly on PROTEL, PADSOR or CAD , such as PCB design system. This habit is very bad. Both a graphic files scanned document is converted into base PCB , and is based on the late conduct inspections. Using a scanner can greatly reduce labor difficulty and intensity . It is no exaggeration to say that if we can make full use of the scanner , even without design experience to personnel can complete PCB board profile system work .
2, single direction grinding plate .
Some designers in the pursuit of speed , two-way choice mill plate ( ie, the middle layer of lamellar worn by the front and rear surfaces ) . In fact, this is very wrong . Because the board is very easy to wear bi- worn , causing damage to other layers , with predictable results. The outer layer of the PCB copper foil due process and , most hard pads and other reasons , the middle layer of the softest . So to most middle layer , the problem is more serious , often can not be polished. In addition , the various manufacturers of PCB board material , hardness, elasticity is different, and difficult to accurately rubbed off .
