Solving solderability issues for printed circuit boards (PCBs) can be a real hassle. Nothing is more frustrating than having lined up all your materials for an assembly, only to start running the package through reflow and discover that the solder paste is wetting poorly to the pads. Immediately, the profile is checked to confirm proper parameters.
With the introduction of ISO 9001:2015, which specifies requirements for quality management systems, the statement “quality management system documentation shall include a quality manual” no longer need apply. Many celebrated this as a reprieve from previously having to fully document their quality management system. However, eliminating the supplier quality manual altogether could be a dangerous takeaway on the new standard’s intention.
Root cause analysis is a technique performed to identify the underlying reasons why a particular problem is occurring. At Epec, we do a lot of problem solving. As manufacturers, we strive to discover better, more efficient ways to delight our customers. Whether we are working on an 8D CAPA or running an A3 Project, we are often working to determine the foundational cause of issues as the means to solving the problem.
As the benefits and capabilities of vendor outsourcing continue to grow, it becomes more important to know what to look for before committing to outsourcing. Developing a sound evaluation approach while knowing what questions to ask of potential suppliers helps maximize efficiency, saving time and money down the road.
With the uncertainty the global economy has brought over the last decade, it has been challenging for many companies to balance the fine line of just-in-time (JIT) inventory management, being line down, and being over budget on inventory numbers. We live in a world where next day delivery of virtually anything has become a guarantee, or at least an expectation.
I can remember the first ‘incident’ of black pad, years ago, when Epec started to use the electroless nickel immersion gold (ENIG) process. We didn’t notice the issue at the time, as it is not evident on the bare board, but received the complaint from assembly as it was later identified on completed assemblies.
IPC 4101 (Specification for Base Materials for Rigid and Multi-Layer Printed Circuit Boards) was released for publication in December, 1997. It was released as the replacement standard for MIL-S-13949. However, it contained a majority of the exact wording from the military standard. It maintained the “slash sheet” format appendix to the standard that specifies the resin and fiber system of different PCB laminates, along with testing parameters and properties. Initially there were 41 slash sheets, but as the industry opens up to “Lead Free” and “Green” processes, the slash sheets have increased to 66, the current revision.
Bow and twist of printed circuit boards (PCB) routinely rank among the highest levels of falsely identified non-conformance because it is perhaps the least understood. Envisioning a perfectly flat rigid circuit board as the standard is a fallacy believed by many incoming inspectors. Understanding the reasons and causes for PCB bow and twist can help resolve the issue at the board design stage.
There was a time when “Made in China” was synonymous with cheaper, poor quality products. "Buyer beware" was the common theme associated with outsourcing to any Asian PCB manufacturers. So how did Epec approach this challenge and succeed? It was by managing quality through intense auditing, training, and qualification. Epec understood at a very early stage that first-class quality products from Asian manufacturers would require consistent presence, training, and auditing.
Cleanliness of bare circuit boards increases in importance with advances in PCB technology that continue to decrease conductor spacing. Inorganic contamination within printed circuit board fabrication can lead to electrochemical migration. Electrochemical migration is the dissolution and movement of metal ions in presence of electric potential, which results in the growth of dendritic structures between anode and cathode. These dendritic growths, which were minimal over periods of time, were not a concern of "yesterdays" bare boards.