JEXPCB / Engineering knowledge
Knowledge Center
Clear answers for better builds. Practical guidance on PCB manufacturing, assembly, component sourcing and engineering decisions—from the first file review to production release.
Featured Articles
Start with these practical guides for your next PCB or PCBA project.
What Files Are Required for a PCB Assembly Quotation?
Prepare a consistent Gerber, BOM and placement package, define the assembly scope and learn how to start with incomplete files.
ENIG vs HASL: How to Choose the Right PCB Surface Finish
Compare planarity, assembly requirements, cost and lead-free specifications before choosing ENIG or HASL for a PCB.
Latest Articles
New technical guidance, automatically added when an article is published.
First Article PCBA Approval: What Should Be Checked Before Mass Assembly?
A practical first-article PCBA approval checklist covering revision control, placement, soldering, traceability, programming, test and release decisions.
PCB Copper Balance: How Uneven Copper Causes Bow, Twist and Assembly Problems
Uneven copper distribution can drive PCB bow, twist, plating variation and assembly instability. Learn what to review before fabrication release.
Why a PCB Supplier Capability Table Is Not Enough for Supplier Evaluation
A PCB capability table is only a screening tool. Evaluate samples, process control, test records, traceability, change control and corrective-action evidence.
PCB Design for Test: Test-Point Planning for ICT, Flying Probe and Functional Test
Plan PCB test points for ICT, flying probe, programming and functional test without compromising access, mechanics, signal integrity or revision control.
PCB Microsection Analysis: What a Cross-Section Can Verify
Learn what PCB microsection analysis can verify about plated holes, inner-layer registration, stackup, laminate and via-fill quality—and its sampling limits.
Moisture-Sensitive Components: MSL, Floor Life, Storage and Baking Guide
Learn how to control moisture-sensitive components using MSL labels, floor-life tracking, dry storage, resealing and validated baking before reflow.
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