Inventory Accounting
Batch inventory verification systematically audits total production inputs against finished units and confirmed scrap upon completion. In printed circuit assembly, yield reconciliation establishes the numerical balance between issued bare boards and final conforming units. The audit procedure governs contractual scrap allowances between buyers and suppliers.
It ceases to apply to warehouse stock outside active job travelers.
Attrition Allocation
Production losses across high-speed surface mount lines divide between natural component attrition and catastrophic process defects. Tape splicing misalignments and vacuum nozzle mispicks consume a baseline percentage of miniature discrete passives during continuous pick-and-place operations. Master service agreements define contractual attrition allowances, commonly permitting up to one percent scrap on standard chips while imposing zero attrition allowances on expensive microprocessors.
Performing yield reconciliation requires matching automated feeder reject counts and manual floor sweepings against electronic enterprise resource planning logs. When actual component fallout surpasses negotiated allowances, financial liability shifts to the assembly contractor for replacement procurement. Discrepancies involving serialized high-value semiconductors trigger root cause investigations to prevent counterfeit substitution or warehouse shrinkage during assembly operations.
Variance Audit
Formal closeout documentation compiles automated defect logs and final warehouse return receipts into a unified reconciliation statement. Quality auditors verify that unpopulated bare boards and defective rejects equal the exact lot traveler issue volume. A discrepancy between physical panel counts and software inventory records prevents production order closure.
Completing yield reconciliation establishes final payment release and validates line efficiency metrics across contract manufacturing programs.
