At PPI-Time Zero, all Printed Circuit Board Assemblies (PCBAs) in our SMT production are optically inspected by our computer-based Automatic Optical Inspection (AOI) system. The AOI system takes a high-resolution image of the inspected PCBA. The image of the PCBA is then analyzed against a reference board. During the analysis, the AOI system will identify possible unacceptable deviations such as wrong components, misorientated and/or misaligned components, “Tombstoning” (where the component is situated like a tombstone), wrong text on chips, or wrong color shades. Some of these mistakes are considered “false errors” where the AOI system learns new approved week codes and texts, so the system will get more accurate with continued use.
The data that we gather from the AOI system is used for many purposes in our production process: general debugging, statistics analysis for our internal quality control, input to improve the processes in SMT production, optimization of the stencils used for applying solder paste, and increased traceability in our production — all PCBAs are scanned and the data from the AOI system is stored on our servers. All PCBAs are registered in our system and PPI-Time Zero makes this information available to our customers, so they also have the opportunity to optimize their design.AOI