PCB Quality Control That Goes Beyond Final Inspection
We don't just inspect—we prevent. FS Technology's rigorous PCB quality assurance and multidimensional PCB quality management system ensures defect-free boards with 99%+ on-time delivery. From design to delivery, every step is monitored, verified, and documented.
Prevention Over Correction,
Details Determine Success
Exceptional PCB quality assurance stems from forward-thinking design and precise control throughout the entire process—not merely final inspections. Our unique "Critical Process Quality Control Mechanism" focuses monitoring on core processes that directly impact final product performance yet are often overlooked.
❌ Traditional Approach
- Rely on final inspection
- Reactive defect discovery
- Costly rework loops
- Inconsistent quality output
- Limited process visibility
✅ FS Technology Approach
- Design-phase prevention
- Proactive process monitoring
- SPI catches issues pre-soldering
- AXI verifies hidden BGA joints
- Full traceability & reporting
Our PCB quality management system is independently audited and continuously improved.
Why Our PCB Quality Control Method Stands Out
At FS Technology, we precisely concentrate on major processes less attended to by other EMS companies. This includes rigorous solder paste inspection (SPI) before reflow, X-ray inspection (AXI) for BGA assemblies, and comprehensive functional circuit testing (FCT) that simulates real-world operating conditions.
We are not merely a PCBA service provider—we are your reliable manufacturing partner committed to PCB quality control excellence at every stage of product development.
After-Sales Commitment
We stand behind every PCBA we ship. If an issue occurs, we react immediately — repair or refund, no questions asked.
PCB Quality Control Methods at FS Technology
We utilize a diversified inspection methodology to establish a multidimensional monitoring system that accurately detects and locates possible defects. Below are the core PCB quality control methods we deploy for various production volumes and product types.
In-Circuit Testing (ICT)
High-speed PCB quality control method using test probes to detect open circuits, short circuits, and erroneous component values with exceptional speed and accuracy. Ideal for mass production PCB quality assurance.
Learn More Prototype / Low-VolumeFlying Probe Testing
Programmable probe movement eliminates costly fixtures, offering precision PCB quality control for prototypes and small batches. Same electrical verification capability as ICT without the tooling investment.
Learn More Visual & SurfaceAutomated Optical Inspection (AOI)
High-resolution cameras capture PCB images for comparison against schematics. Detects misplaced parts, solder joint defects, and cosmetic errors—an essential part of our PCB quality management workflow.
Learn More Hidden DefectsX-Ray Inspection (AXI)
Non-destructive detection of concealed faults such as BGA solder voids and internal chip cracks. Critical for ultra-fine pitch, high-density PCB quality assurance without destructive teardown.
Learn More Pre-ReflowSolder Paste Inspection (SPI)
3D laser scanning technology verifies solder paste thickness, area, and volume distribution before reflow—preventing defects at the source. A cornerstone of our preventive PCB quality control method.
Learn More Real-World SimulationFunctional Circuit Test (FCT)
Simulates actual-use conditions to verify power management, signal processing, and logic control. Ensures every module meets design specifications—the final gate of PCB quality assurance before delivery.
Learn MorePCB Quality Assurance Throughout the Entire Process
Our PCB quality management permeates every stage—design, manufacturing, and assembly—forming an impenetrable quality defense. Click each phase to explore detailed control points.
Design Phase
DFM & SimulationRaw Material
IQC & StorageSMT Assembly
SPI · AOI · AXIFinal Testing
FCT · ReliabilityDelivery
Packaging & TraceabilityDesign Phase — Quality Control for PCB Design
- Schematic design with professional EDA software
- Signal integrity & power integrity simulation
- Strict impedance matching for high-frequency circuits
- DFM (Design for Manufacturability) review
- Complete Gerber, drill & BOM file verification
- Proactive elimination of design-level defects
Raw Material — Incoming Quality Control (IQC)
- PCB inspection: thickness, vias, pads, silkscreen, warpage
- Component verification: part number, value, RoHS compliance
- Physical & chemical property examination of substrates
- Sensitive components stored at 5% RH humidity-controlled cabinets
- Solder paste refrigerated at 2–10°C with expiration tracking
- Material identification cards for full traceability
SMT Assembly — Core PCB Quality Control Methods
- Automatic solder paste mixing (2–5 min clockwise stirring)
- Laser stencil for high-precision BGA/QFN pads
- 3D SPI inspection: thickness, area, volume verification
- 5 SMT lines + 2 THT lines with automated manufacturing
- 10-zone reflow oven for stable temperature profiling
- First Article Inspection (FAI) before batch production
- In-line AOI at the end of every production line
- X-ray inspection for BGA assembly soldering quality
Final Testing — Functional & Reliability Verification
- 100% Functional Circuit Test (FCT) simulating real conditions
- Aging tests under specific temperature, humidity & vibration
- Thermal stress testing (288°C solder float)
- Temperature cycling (-40°C to +125°C)
- Insulation resistance & dielectric withstand testing
- TDR impedance testing for high-speed/high-frequency PCBs
- Solderability & ionic contamination testing
- Peel strength testing for mechanical stability
Delivery — Packaging & Complete Traceability
- Anti-static bubble bags & pearl cotton wrapping
- Vacuum-sealed electrostatic bags for moisture protection
- Detailed test reports documenting every inspection result
- Failure analysis records for future design improvements
- Video-recorded test operations shared with clients
- 100% customer confirmation before shipment
Common PCB Quality Inspection Items & Standards
Our testing encompasses all dimensions—appearance, electrical properties, physical characteristics, and reliability—strictly adhering to IPC-A-600, IPC-6012, IPC-TM-650 and other internationally recognized PCB quality control standards.
| Inspection Category | Specific Test Items | Key Specifications | Common Standard References |
|---|---|---|---|
| Visual Inspection | Surface defects, line defects, hole wall quality, solder mask coverage, marking/legend | No opens, shorts, nicks, or copper residue; uniform solder mask color | IPC-A-600, Customer Drawings |
| Physical / Structural | Dimensions (thickness, length, width), hole location, line width/space, warpage | Warpage ≤0.75%; dimensional tolerance per drawing | IPC-6012, IPC-TM-650 |
| Electrical Performance | Continuity (open/short), insulation resistance, dielectric withstand, impedance control | Insulation resistance ≥2MΩ (Class 2/3); impedance ±10% | IPC-9252, IPC-6012, IPC-TM-650 |
| Mechanical Performance | Peel strength, solder pad strength, plated-through hole pull strength | After thermal stress; no delamination or cracking | IPC-TM-650 (2.4.1), IPC-6012 |
| Environmental & Reliability | Thermal stress (solder float), solderability, ionic cleanliness, thermal cycling, humidity | 288°C solder float; 85°C/85% RH storage; -40°C to +125°C cycling | IPC-TM-650, IPC-6012, GJB 362B |
| Chemical / Material | Surface finish thickness, flammability (UL94), RoHS compliance | Gold/tin thickness per IPC-4552 series; RoHS per IEC 62321 | IPC-4552 Series, UL 94, IEC 62321 |
Choose FS Technology—Choose Uncompromising PCB Quality Control
Choosing FS Technology means selecting not just an individual service, but an unwavering commitment to PCB quality assurance. Our independent quality department, detailed test reports, and continuous improvement culture ensure your products achieve superior market performance.
Contact Our Quality Experts Download CertificatesOr request a free DFM consultation — we'll review your design for manufacturability before production begins.
Frequently Asked Quertions
We control PCB quality according to the ISO9001:2015 quality management system standard.
The PCB assembly standard our company follows is the PCBA patch quality inspection standard, also known as the PCBA appearance inspection standard (IPC-610).
Yes, we accept product inspections. You can schedule an appointment with our sales staff and we will arrange a workstation for your personnel to inspect the product. We also support video inspections.
Final inspection before packaging is manual. Some products require functional testing with equipment, while others are manually inspected using tools such as microscopes and magnifying glasses.
Our quality control personnel will inspect each production process daily and record any quality issues as required. We will take special action and record any processes with specific issues or customer feedback.
Yes, all our production lines have standard SOP guidelines to ensure product quality and standards. We also provide dedicated training and guidance to our employees during daily morning meetings and before production.
We prioritize suppliers from first-tier distributors. For other suppliers of specialized products, we require sample testing and product inspection before deciding on long-term cooperation. We also require suppliers to provide relevant certifications.
Our Purchasing, Production, and Quality Departments all have their own management systems, and each department works closely with the others.
We use different agents or suppliers for different component brands. We compare prices to select the most competitive supplier for each brand, striving to provide customers with the best pricing and access.
We inspect according to IPC-600G, IPC-610-G, and GB2828-87 standards, and also adhere to our company-developed IQC “Incoming Material Inspection Specifications.”
Yes, we have standard shipping test reports for PCBs. PCBA can provide appearance and functional test reports upon request.
We achieve a 99.4% yield rate for PCB production and a 98.5% yield rate for PCBA production, with a 100% shipping control.
For all products, we archive project information, production date, and all incoming material inspection records. Shipped goods are labeled with a specific project number and production cycle for traceability.
Our company employs IPQC to conduct incoming material inspections on all materials and PCBs, and our PCBs are 100% inspected at the PCB factory. PCBA products that fail testing are handled by our quality control and repair departments to ensure they pass testing before shipment.
All our orders are produced with order instructions. Each production process has a process card to record production data and various problems. If PCBA requires a test report, our company can provide the test report. In addition, all complaints will be sent to the relevant departments by email for archiving and traceability and subsequent quality inspection.
Contact Info
Email Us
info@fs-pcba.com
Call Us
+86-13715307049
Address
Building 4, Fuqiao Industrial Zone, No. 79, Tianfu Road, Fuhai Street, Bao’an District, Shenzhen