PCB Assembly Quality Control
Components Quality Control
In order to ensure good quality of components, there are several processes that we follow:
1.An overview of the visual electronic components inspection process include
1.1 Packaging examined: Weighed and checked for damage; Taping condition inspected-dented package etc; Original factory sealed vs. non-factory sealed.
1.2 Shipping documents verified: Country of origin; Purchase order and sales order numbers match;
1.3 Manufacturer P/N, quantity, date code verification, RoHS
1.4 Moisture barrier protection verified – vacuum sealed and humidity indicator with specification.
1.5 Products and packaging (photographed and cataloged)
1.6 Body marking inspection (faded markings, broken text, double print, ink stamps etc.)
1.7 Physical conditions inspection (lead bands, scratches, chipped edges etc.)
1.8 Any other visual irregularities found.
Once our visual distribution inspection is completed, products are escalated to the next level-electronic components engineering distribution inspection for review.
2.Engineering Components Inspection
Our highly skilled and trained engineers receive the components for evaluation at a microscopic level to ensure consistency and quality. Any suspect parts or discrepancies that are discovered in the visual inspection process will either be verified or discounted by taking a product sampling of the material.
The engineering electronic components distribution inspection process includes:
2.1 Review visual inspection findings and notes.
2.2 Purchase and sales orders numbers verified.
2.3 Verification of labels(bar codes)
2.4 Manufacturer’s logo and date log verification.
2.5 Moisture sensitivity level and RoHS status.
2.6 Extensive marking permanency tests.
2.7 Review and comparision to manufacturer data sheet.
2.8 Additional photos taken and cataloged.
2.9 Solderibility Testing.
AOI Inspection for surface mount technology(SMT)
As a primary testing technique in PCB assembly, AOI applies to fast and accurate inspection of errors or defects occurring in PCB assembly process, so that high quality of PCB assemblies can be ensured with no defect after their leaving assembly line. AOI is contributive to efficiency improvement because it is placed on SMT assembly line, just after reflow. As soon as some problems are inspected and reported by AOI equipment, engineers can instantly change corresponding parameters in the previous stages of the assembly line, so that remaining products will be correctly assembled. AOI can cover primarily come in soldering and components categories. In terms of soldering, AOI detect the defects ranged from open circuits, solder bridges, solder shorts, insufficient solder to excess solder. Component defects include lifted lead, missing components, misaligned or misplaced components.
Our automated X-Ray inspection systems are able to monitor a variety of aspects of a printed circuit board in assembly production. The inspection is done after the soldering process to monitor defects in soldering quality. Our equipment is able to “see” solder joints that are under packages such as BGA, CSP and FLIP chips where the solder joints are hidden. This allows us to verify that the assembly is done correctly. The defects and other information detected by the inspection system can be quickly analyzed and the process altered to reduce the defects and improve the quality of the final products. In this way not only are actual faults detectd, but the process can be altered to reduce the fault levels on the boards coming through. Use of this equipment allows us to ensure that the highest standards are maintained in our assembly.
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