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If it is the four layer, the six layer, the eight layer, but also how to deal with it?
In fact, the four layer is to repeat the two double, the six layer is to repeat the three double...... The multilayer, daunting, because we cannot see its internal wiring. A precision PCB multilayer, how do we see the inner universe? - stratification.
There are a lot of PCB layered approach, there is water erosion, cutting tools, etc., but it is easy to PCB layer over the head, the loss of information. Experience tells us that the sandpaper is the most accurate printed circuit board.
When we copied the top bottom of the PCB are generally polished with sandpaper, grinding out the inner surface display; sandpaper is hardware store sells the ordinary sandpaper, general tiling PCB, and then press and hold the sandpaper, uniformly on the PCB friction (if the board is small, can also be tiled sandpaper, a finger hold PCB in sandpaper friction with). The main point is to pave the way, so that it can be worn evenly.
Silk screen and green general a wipe off, PCB copper wire and copper skin you need to brush a few times. In general, a few minutes of Bluetooth board will be able to wipe, memory is probably a dozen minutes; of course, great efforts to spend time will be less; strength of the time will be a little more flowers PCB copy board .
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