pcb copy board technology implementation process in simple terms, is to first scan copy board circuit boards, record the details of the components, and components removed to make material list (BOM) and arrange the material purchasing, empty plate image is scanned into the software processing back into PCB copy board figure file, and then send a PCB file to plate making factory system board, the board is made after the purchase to components made of welded to the PCB board, then through the circuit board testing and debugging.
PCB copy board specific steps:
The first step is to get a piece of PCB, first in the paper to record all elements of the model, parameters, as well as the location, especially the diode, the direction of the triple tube, the direction of the IC gap. It is better to digital camera two pictures from a location. Now the PCB more do more advanced the diode triode, some do not pay attention to don't see above.
The second step, tear down all laminated copy board, the tin in the PAD holes and be removed. PCB clean with alcohol, and then put into the scanner, the scanner to scan when need somewhat higher scan pixels, in order to get a clear image. Yarn paper will top and bottom with water slightly grinding, polishing to copper film, into the scanner, start PHOTOSHOP, knocked two layers respectively into in color mode. Note that the PCB must be horizontal even vertical, put in the scanner or scanning image is unusable.
The third step, adjust the contrast of the canvas, the contrast, the copper film part of and not part of the copper film contrast, then the first figure to black and white, check whether the line is clear, if not clear, repeat this step. If clear, will survive for the black and white TOP. The BMP file format of BMP and BOT. BMP, if found problems graphics can also repair and correction in PHOTOSHOP.
The fourth step, the two BMP format into PROTEL format file, respectively in PROTEL transfer into two layers, such as a two layer of the PAD and the location of the VIA basic coincidence, that several steps before doing very well, if there is a deviation, then repeat step 3. So PCB copy board is a very need patience work, because a little problem will affect the quality and copy the board after the match.
Fifth, TOP. The TOP layer of BMP can be converted to PCB, be careful to into a SILK layer, the layer is yellow, then you are in the TOP layer is tracing, and drawing device according to the second step. After the draw will delete the SILK layer. Repeated know to draw all the layers.
Six, In TOP.PCB and BOT.PCB in PROTEL, as a graph on OK
The seventh step, using a laser printer TOPLAYER, BOTTOMLAYER print to transparencies (1:1 ratio), the film on the piece of PCB, compare whether the error, if yes, you will be accomplished.
Copy board piece and the original board like was born, but this is only half done. Would also like to test, electronic technology and performance testing copy board is not and the original board. If it is done.
Note: if the multilayer also carefully polished to the inside of the inner layer, at the same time, repeat third to copy board step fifth step, of course, the naming of the graphics are different, according to the number of layers, the general double sided board than many simple multilayer, multilayer board copy prone misaligned, so the multilayer copy plate to be especially careful and careful (internal vias and not via hole is prone to problems).
Methods double sided board:
The 1 scan line board on the surface, two BMP images.
2 open the copy board software Quickpcb2005, point "file" "open map", opened a scanned image. Zoom in screen using PAGEUP, see pad, put a pad in PP, see the line according to the PT line...... Just like children tracing, in this software painted again, click "save" to generate a B2P file.
3 Click "file" "open map", open the scanning pictures a second layer;
4 click "file" "open", open a previously saved B2P file, we see just copy plate, stacked on the picture -- the same piece of PCB board, hole in the same location, just a line to connect different. So we press the "option" -- "layer", here to show off the top line and screen printing, leaving only a hole multilayer.
Through hole and the bottom to the top of the picture 5 through holes in the same place, now we like childhood tracing, tracing out the bottom line on it. Then click "save" -- when the B2P file is the data of top and bottom two layers.
6 "file" "export to PCB file", you can get a two layer data of PCB files, can be changed to a board or schematic or sent directly to PCB plate making factory
Method of multilayer board:
In fact, four ply board copy board is to repeat the copy two double-sided board, the six layer is to repeat the copy three double-sided board...... , multilayer is daunting, because we can't see the inside line. A sophisticated multilayer board, how can we see the inner universe? -- layered.
There are many layered approach, a potion corrosion, cutter stripping, but very easy to layer is divided into head, missing data. Experience tells us, sanding is the most accurate.
When we had copied the top bottom PCB, usually with sandpaper and grinding method, grinding out the inner surface display; sandpaper is hardware store sells ordinary sandpaper, generally flat PCB, and then press and hold the sandpaper, even on PCB friction (if the board is very small, also can be tiled sandpaper, use a finger hold PCB friction on the sand paper). The key is to pave the way, so that they can wear a uniform.
Screen printing and the green is generally a wipe off, copper and copper will take just a few. In general, the Bluetooth board can wipe a few minutes, the memory about ten minutes; of course, big strength, take a little less; time will be a little more effort.
Grinding plate is the most common use of the hierarchical scheme, is the most economical. We can find a piece of discarded PCB try, in fact, grinding plate not what technical difficulty, just a little boring, put some effort into, need not worry completely put the boards worn grinding to trigger finger.
PCB chart review
PCB layout process, the system layout is completed, to examine the PCB diagram, system layout is reasonable, whether we can achieve the optimal effect. Usually can be studied from the following several aspects:
1 system layout is to ensure the reasonable and optimal routing, is to ensure the reliability of the wiring, whether can assure the working reliability of the circuit. In the layout to the signal and power and ground networks have a overall understanding and planning.
2 printed board dimensions and processing drawings size, can meet the requirements, PCB manufacturing process has no behaviour marker. This requires special attention to the circuit layout, many PCB board and wiring are beautifully designed, reasonable, but neglect the accurate positioning of connectors, lead to the design of the circuit and other circuit connection cannot be.
3 elements have no conflict in two-dimensional, three-dimensional space. Note that the actual size of the device, especially the device height. In the welding free layout of the components, the general height should not exceed 3mm.
4 element layout is orderly density, arranged in neat rows, whether all the cloth. When the component layout, we should consider not only the types, signals and signals to the need to pay attention to or protection in place, but also to consider the overall density device layout, to achieve uniform density.
5 the need for frequent replacement of components can be replaced conveniently, board insertion device is convenient. Should ensure that the replacement of frequently changing components and plug convenient and reliable.
