PCB Assembly Drawing: Show How the Board Must Be Built

For a prototype assembly review, provide top and bottom assembly views as needed, with reference designators, component outlines and clear orientation. Label the viewing direction so a mirrored bottom view cannot be mistaken for a top view.

Identify connector orientation, pin 1 and polarity for parts where a mistake would be difficult to detect or rework. Keep critical notes readable at the exported page size; a crowded screenshot is not a controlled assembly document.

Add DNP markings, variant notes, hardware, fasteners, cables, adhesives, coating keep-outs and other project-specific assembly instructions. Define any required torque or process value through the approved design rather than generic text.

For turnkey PCB assembly, cross-reference the BOM and relevant mechanical drawings so sourcing and assembly use the same requirements. If a non-electrical item is required for delivery, give it an identifier and a clear source of specification.

Put assembly number, revision and variant on the drawing and check consistency with the BOM and placement export in the PCB assembly data package. Review the final PDF rather than assuming the CAD view exported exactly as intended.

When a change affects population or orientation, revise the drawing and identify the affected build. Keep previous releases for traceability without mixing them into the current manufacturing folder. Define the drawing features to compare during first article inspection so the fitted assembly is reviewed against the intended variant.