QUALITY ASSURANCE

Calpak USA's quality pipeline begins with engineering review and design for manufacturability analysis before any board enters production, catching pad geometry issues, trace clearance violations, and component footprint errors when corrections cost the least. During assembly, IPC J-STD-001 certified operators follow documented work instructions with process controls on solder paste deposition, reflow profiling, and selective soldering parameters. Every populated board passes through automated optical inspection programmed to detect solder defects, component misalignment, polarity errors, and missing parts. Custom functional test fixtures then verify that each unit meets electrical and performance specifications under operating conditions. Finally, visual inspection and packaging verification ensure that shipped product meets cosmetic and labeling requirements. All five stages are documented with serial-number traceability at our Hawthorne, California facility under AS9100 Rev D quality controls.

Calpak USA applies structured root-cause analysis using 8D methodology and fishbone diagramming whenever a defect is detected during assembly, inspection, or test. Rather than simply reworking the defective unit and continuing production, our quality engineers investigate the failure mechanism to determine whether it originated from a component issue, a process parameter drift, an operator technique variation, or a design marginality. Corrective actions are documented, implemented, and verified for effectiveness through follow-up monitoring at our Hawthorne, California facility. Statistical process control data from solder paste inspection, reflow profile monitoring, and AOI defect trending provides early warning indicators that allow Calpak to detect process shifts before they produce defects. This proactive approach, combined with our AS9100 Rev D corrective action system, drives continuous improvement toward the zero-defect manufacturing target that aerospace and defense customers require.

Calpak USA's automated optical inspection systems use high-resolution cameras and advanced image processing algorithms to inspect every populated circuit board after reflow soldering. AOI detects solder bridges, insufficient solder, tombstoned components, missing components, wrong-value components based on marking verification, polarity reversals on diodes and electrolytic capacitors, and lifted leads on fine-pitch QFP and connector packages. Programming each new board model involves creating a golden reference image library and defining inspection windows with acceptance tolerances for each component and solder joint. At our Hawthorne, California facility, AOI is positioned inline after reflow soldering and again after selective or wave soldering for mixed-technology boards. Defects flagged by AOI are reviewed by IPC-certified inspectors who disposition each finding as a true defect or false call. AOI defect data feeds into our statistical process control system to track yield trends across production lots.

Calpak USA's design for manufacturability review evaluates the customer's Gerber files, bill of materials, and assembly drawings against our manufacturing process capabilities and IPC design guidelines before any production tooling or material procurement begins. Our engineers check pad-to-pad clearances against solder paste stencil design rules, verify that component footprints match manufacturer-recommended land patterns per IPC-7351, evaluate thermal relief connections on ground planes that affect solderability, and flag components with moisture sensitivity levels requiring bake-out procedures. Drill-to-copper clearances, solder mask dam widths, and via-in-pad designs are verified against our fabrication capabilities. DFM findings are documented in a formal report with recommended corrections categorized as critical, major, or advisory. Calpak USA's Hawthorne, California engineering team reviews DFM results with the customer before releasing files for production, preventing yield-impacting issues from reaching the assembly floor.