Talking about: PCB board production precautions

1. Schematic common errors

(1) The ERC report pin has no access signal:

a. Define the I/O attribute to the pin when creating the package;

b. Inconsistent grid properties were modified when components were created or placed, and pins and lines were not connected;

c. When the component is created, the direction of the pin is reversed, and the connection must be non-pinname.

(2) The component went outside the drawing boundary: No component was created in the center of the component library chart sheet.

(3) The created net file of the project file can only be partially transferred to pcb: When netlist is generated, global is not selected.

(4) Do not use annotate when using self-created multi-component components.

2. Common mistakes in PCB

(1) NODE was not found when the network was loaded:

a. The components in the schematic use packages that are not in the pcb library;

b. Components in the schematic use packages with inconsistent names in the pcb library;

c. The components in the schematic use packages with inconsistent pin numbers in the pcb library. For example, if the transistor is sch, the pinnumber is e, b, c, and the pcb is 1, 2, and 3.

(2) Prints cannot always print on one page:

a. The pcb library was not created at the origin;

b. Multiple movements and rotations of the component, hidden characters outside the pcb board. Select Show All Hidden Characters, Decrease pcb, and Move Characters Within Borders.

(3) The DRC report network is divided into several parts: Indicates that the network is not connected. Look at the report file. Use CONNECTEDCOPPER to find it. In addition to remind friends to use WIN2000 as much as possible to reduce the chance of blue screen; several times to export files, make a new DDB file, reduce the file size and PROTEL zombie opportunities. If you have to design more complex, try not to use automatic routing. In the PCB design, wiring is an important step to complete the product design. It can be said that the previous preparation work is done for it. In the entire PCB, the design process of the wiring is the most restrictive, the technique is the finest, and the workload is the largest. PCB layouts are single-sided, double-sided, and multilayer.

There are also two ways of wiring: auto-wiring and interactive wiring. Before auto-wiring, you can interactively pre-wire the more stringent requirements. The input and output side edges should avoid adjacent parallel to avoid reflection interference. If necessary, ground isolation should be added. The wiring of two adjacent layers should be perpendicular to each other, and parallelism is likely to cause parasitic coupling.