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How are components soldered onto an assembly drawing pcb?

components soldered onto an assembly drawing pcb

Once the PCB layout is complete, it needs to be turned into an assembly drawing pcb, which will provide fabrication and assembly instructions for the manufacturer. These instructions will be used to solder the components into place on the board, and they must be accurate in order for the manufacturing process to go smoothly.

The assembly drawing pcb will typically include the board outline, component outlines with reference designators, and assembly notes. The latter will include instructions for assembling the board, and they may contain details like specialized assembly methods, height restrictions of the board, cable orientation, and more. The notes can also contain a parts list if requested by the contract manufacturer.

Some designers feel that assembly drawings are unnecessary for small boards with simple features and well-marked silkscreen legends. However, even low-complexity circuit boards require assembly drawings to help prevent errors and aid inspection.

How are components soldered onto an assembly drawing pcb?

The first step in creating an assembly drawing pcb is to use the CAD system’s format to build the layout from your component database and your PCB layout. This is usually done using a button or menu in the software program. Depending on the CAD system you’re using, it may also auto-generate the drawing formats for you.

You’ll need to identify all of the components that will be soldered onto the board, and you’ll need to add reference designators for them. Reference designators are alphanumeric labels that are assigned to each component on the board, and they can be referred to by name in the bill of materials and in the assembly drawing. You’ll also want to include the dimensions of the components and their spacing on the board.

Identifying label locations: If the circuit board has any identifying labels such as barcodes or assembly tags, you’ll need to indicate their location with a drawing pointer and include a reference to them in the assembly notes. Similarly, if the circuit board has any special handling requirements you’ll need to indicate them with a warning note or text box in the assembly drawing.

Other important elements of the assembly drawing include a list of assembly notes, a list of industry standards and specifications for the assembly process, and any special features that need to be noted on the assembly drawing. You’ll also need to include the bill of materials if requested by the contract manufacturer.

The assembly notes will include information such as the designation of the primary side, mounting instructions, specialized assembly methods, height restrictions, and cable orientation. In addition, you’ll need to specify if the board has plated through-holes or surface mount holes. The factory will then solder the components into place using a wave or selective soldering method. The finished product is inspected for defects by the contract manufacturer. If there are any issues, the contract manufacturer will contact the designer and work with them to resolve the problem. The contract manufacturer will then send the assembled circuit board back to the designer for testing and revision.

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