Conformance Boundary
Mandatory inspection and test standards define the threshold that a manufacturing lot of printed circuit boards must satisfy before physical shipment or transfer to assembly line stock. Production lots failing to satisfy batch release criteria remain quarantined until non-conformance reports resolve the underlying defect or trigger scrap procedures. Testing at this stage applies strictly to completed production lots prior to integration into higher-level subassemblies.
Verification Mechanism
Automated optical inspection combines with microsection analysis to evaluate plating thickness, solder mask alignment, surface finish and barrel copper integrity across designated test coupons. Quality assurance personnel cross-reference cross-section microphotographs against design drawing tolerances to ensure all physical dimensions meet contract requirements. Automated flying probe tests confirm net list continuity, catching latent open circuits or trace shorts before packaging.
When coupon microsections reveal voiding inside plated through-holes that exceeds permitted percentages, the entire lot is withheld from distribution.
Lot Disposition
Non-compliant lots undergo failure analysis to isolate whether processing anomalies occurred during electroplating, etching, drilling or lamination. Remedial rework occurs only if the governing engineering specification explicitly permits re-baking, re-soldering or selective trimming. Uncorrectable physical defects force total scrap disposition to prevent defective circuit boards from entering production supply chains.
Acceptance documentation signed by certified quality auditors seals the record and allows shipment.
