Formal Discrepancy Documentation
Printed evidence provides a record of failure when a fabricated component or an assembled circuit board deviates from the specific requirements of a defined quality plan. A non-conformance report captures the exact nature of the variance discovered during incoming inspection or during the final audit of a completed production run. This instrument defines the technical boundary between acceptable yield and rejects by citing the precise standard that the hardware fails to reach.
Every physical anomaly requires a documented justification for the departure from drawing specifications or industry workmanship norms.
Control Mechanism
Deviations often arise during the transition from bare board fabrication to populated assembly when component placement accuracy drops below the threshold set by the solder paste stencil or the pick and place machine profile. Inspection stations generate the non-conformance report immediately upon detecting a bridge between pads or a skewed orientation that exceeds the allowable tolerance for high density circuitry. Personnel initiate the review process by categorizing the error as reworkable, repairable or scrap based on the potential impact on long term signal integrity or thermal management.
Engineering staff evaluate the findings to determine whether the deviation exists within a small subset of the population or indicates a systemic failure within the surface mount line. Systematic errors force a halt to the conveyor to prevent further accumulation of defective units while the root cause undergoes a rigorous technical assessment. Records generated here provide the data for statistical process control charts and future design rule adjustments.
Operational Consequence
Formal identification of defects prevents sub-standard hardware from entering the supply chain or reaching an end customer where electrical failure might occur. Rigorous adherence to the reporting procedure ensures that scrap costs stay visible to the management team while maintaining clear accountability for individual production shifts. Each document tracks the lifecycle of the defect from detection through the final disposition of the affected inventory.
Disposal of unrecoverable units preserves the integrity of the total stock.
