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The PCB design of the printed circuit board (hereinafter referred to as the circuit board) is based on the schematic circuit diagram, thus realizing the functional characteristics required by the engineer. The design of the PCB refers to the design of the layout, while considering the overall layout of external connections. Finally, the overall layout of internal electronic components is coordinated. The overall layout of the metal wire and the through hole (through hole). Electromagnetic protection. Factors such as heat dissipation. A reasonable and complete layout design can not only save production costs, but also maximize the use of the circuit board to achieve good circuit performance and heat dissipation. Simple layout design can usually be realized by hand, while complex layout design may be realized with the help of computer functions.
Since our PCB pricing is mainly based on the customer’s well-designed document design, it is converted into our internal Gerber production document and circuit board production. Therefore, in the daily processing of EQ, it is impossible to understand the principle of customer design, and we need to contact the customer again confirm. The engineer designed a summary of some common small problems that appeared above.
In terms of dimensions:
1: The customer lacks the form factor layer (mechanical layer 1 or reserved layer) in the PCB design file.
2: The mechanical layer and the barrier layer overlap to produce large and small loops.
3: The template layer and the drilling layer overlap to form a slotted hole.
4: The shape above the groove is less than 0.8 (the shortest drill width of the current Jet Circle factory is 0.8), the customer needs to increase it to 0.8 or cancel production. Fifth, the shape of the corners has a right angle and the arcs coincide.
online:
1: Where the customer is at the line disconnection, whether the connection/line somewhere overlaps, regardless of whether the connection is disconnected or not.
2: The spacing and width between the line and the second line exceed the limit of 5 million in our factory.
3: The grid spacing of the board is too small and less than 0.2mm. Don't do it. Fill in the copper sheet directly to produce or modify the spacing to 0.2 or greater?
On the solder block:
1: There is more than one window in the solder paste layer, and there is no corresponding open window in the group soldering layer.
2: The ic pad spacing is not 0.25mm and can not be used as a welding bridge, whether it can be designed with windows.
About the role:
1: The character design on the PCB pad will affect the soldering and will be deleted or deleted directly.
2: The minimum width of the character (0.15mm) The minimum height of the character (0.8mm), if it is less than the standard length and width, the physical board may cause the characters to be unclear due to design reasons.
3: The basic feature design of the file is affirmative, and it is necessary to confirm whether the basic design is affirmative or the need for mirroring or special design according to the file.
In the well:
1: Vias with the edge of the board less than 0.4mm cannot guarantee pads. Does it contain no copper?
2: It is not possible to make electroplated holes over 10mm, can it be made without copper? of
3: Square holes cannot be made, can they be made oval?
4: In the PCB file, some holes are copper-free, but there should be a cushion to open the window. Should they be copper-free according to this characteristic?
5: There are a lot of files, each hole has a heavy hole, not sure what to do?
6: The slot, drilling, shape, and size of the mechanical layer in the file are different. Please confirm which layer the file is produced in.
