Can an assembly drawing pcb be modified after assembly?

assembly drawing

A clear assembly drawing pcb allows manufacturing technicians to follow proper assembly procedures and minimize errors in the assembling process. It is also a key tool to assess manufacturability early in the design phase of a printed circuit board. Incorrect component placement, ill-conceived connections, and unnecessarily complex routing can all be eliminated by creating clear assembly drawings that communicate the correct procedures to assembly technicians.

A PCB assembly drawing is the high-level schematic of a complete circuit board extracted from the PCB layout file. It includes all of the component placements along with their associated reference designators and labels. It can also include the locations of cutouts and slots as well as a list of all of the parts that are required to assemble the circuit board. A list of all the populated components along with their part numbers and values must also be included. If your circuit board has any special requirements like impedance control, gold fingers or unique stack up/thickness that would be difficult to represent in a schematic (such as an ejector handle for a mechanical component) you should also specify these in the assembly drawing.

An assembly drawing pcb should also include a description of the physical dimensions of the board including the overall size and spacing between components as well as the placement of any mounting holes. In addition, it should include any post-assembly operations such as conformal coating or testing. It should also show a photo of any physical components such as harnesses, connectors or trays. The underlying silkscreen legend from the PCB layout file should be included to show the location of any solder pads.

Can an assembly drawing pcb be modified after assembly?

In some cases, there may not be enough space on the actual PCB to print all of the necessary assembly markings. In these cases, an assembly drawing is used to provide guidance to assembly, inspection and field service personnel. An assembly drawing pcb should be easy to read and clearly display all reference markings such as component footprints, classes and their corresponding reference designators.

Besides the component outlines, an Assembly Drawing pcb should also clearly illustrate all of the interconnections between each of the components. This can be done using lines or a symbol to indicate each of the connections. It is important to note that the connection points on the assembly drawing should match the corresponding points on the PCB to ensure proper connections during the assembly process.

Finally, the Assembly Drawing pcb should also include the assembly instructions. These can be either a list of steps or a set of numbered instructions that outline the sequence for the assembly of the PCB. This should be matched to the BOM so that any populated components are marked as such and the remainder of the assembly is identified as Non-populated Items (DNI). This will make it easier for the assembly technician to locate each item during the assembly process and reduce mistakes. In addition, the Assembly Drawing pcb should contain all of the parts listed in the BOM to help verify that all of the components are in stock.

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