Key Quality Control Points in PCBA Contract Manufacturing with Parts Supply
Key Points
- IQC Incoming Inspection: Visual, Solderability, and X-Ray Checks to Strictly Counterfeit Parts
- SMT Process Control: Four Key Parameters – Stencil Printing, Component Placement Accuracy, and Reflow Soldering Temperature Profile
- Five-stage quality control system with defect rates below 0.3%.
PCBA (Printed Circuit Board Assembly) contract manufacturing and material sourcing services rely on quality control as the core determinant of product reliability. This article details key quality management practices across five critical stages.
1. IQC Incoming Inspection All components must undergo visual inspection, solderability testing, and X-Ray examination (for BGA/QFN packages) before warehousing. Prioritize control of counterfeit parts by implementing a supplier qualification and blacklist system.
II. SMT Stencil Printing Process Control Stencil print thickness, solder paste activity, placement accuracy, and reflow temperature profile are the four critical parameters. We recommend verifying the first article every 2 hours and using SPI (Solder Paste Inspection) and AOI (Automated Optical Inspection) for process monitoring.
3. DIP Plugins and Wave Soldering Observe component polarity, lead forming, and flux application volume. Wave soldering temperature is typically maintained between 250°C and 260°C; conveyor speed should be adjusted based on PCB thickness.
4. ICT Online Testing Verify solder connectivity and component value deviations using bed-of-nails testing. Test coverage must exceed 95%, with focus on power short circuits, open circuits, and missing, extra, or incorrectly oriented components.
5. FCT Functional Test Simulates real-world operating conditions to verify product functionality. Includes power-on tests, communication interface tests, load tests, and burn-in tests.
Lexin Electronic Technology (Baiantu) strictly implements the aforementioned five-stage quality control process for PCBA services, maintaining a defect rate below 0.3% while continuously improving customer satisfaction.
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