Final Quality Control (FQC)
KKPCB is your trusted partner for PCB manufacturing and assembly. Beyond providing friendly service and on-time delivery, we are committed to producing high-quality PCBs and PCBA solutions that consistently meet or exceed customer expectations.
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Manufacturing Standards
Our experienced technicians follow strict industry standards and high-quality requirements to ensure every PCB and PCBA meets exceptional performance and reliability.
Quality Control Process
At KKPCB, we believe that a comprehensive quality control process is the key to consistently delivering reliable and high-quality PCBs and PCBA products.
Quality Reports & Certifications
KKPCB provides comprehensive quality reports and industry-standard certifications, demonstrating the reliability and high quality of our PCB and PCBA products.
Raw Material Download
Download detailed specifications of the raw materials used in our PCB and PCBA production to ensure transparency and quality compliance.
Manufacturing Standards
Our skilled technicians adhere to strict industry standards, ensuring every PCB and PCBA is manufactured with exceptional quality, reliability, and consistency.
PCB Standards
PCB Production standards follow IPC Class 2,IPC Class 3, ,Automotive Standard, Customer Standard
| Item | Advanced PCB | Standard PCB |
|---|---|---|
| Engineering | One file/1 day + Senior Engineer | Mid-level Engineer (1 file/hour) |
| Material | Shengyi, Rogers, Arlon, Isola, Omega, Nelco, 3M, etc. Compliant with Class B/L IPC4101 | KB (Kingboard) / GDM (Goldenmax) Compliant with Class B/L IPC4101 |
| Inks & Solder Mask | Rohm&Haas, TAIYO, Kuangshun, Compliant with Class T IPC-SM-840 | TAIYO, Kuangshun, Compliant with Class T IPC-SM-840 |
| Drilling | Min. mechanical hole size 0.15 mm, laser hole 0.1 mm | Min. mechanical hole size 0.2 mm |
| Plating | PTH (copper thickness in hole ≥20 μm), IPC 3 (25 μm) | PTH (copper thickness in hole ≥18 μm) |
| Solder Mask Offset | ±2 mil | ±3 mil |
| Dimensional Tolerance | ±0.13 mm | ±0.2 mm |
| Warp Angle | 0.75% | 1% |
| Testing Method | A.O.I, 4-wire Kelvin measurement, microsection, solderability test, impedance test... | A.O.I., flying probe testing, fixture testing |
| Glass Transition Temperature ℃ | >140℃ | >130℃ |
| Trace Etching | Repairing traces is prohibited (IPC 3, Automotive standard, Customer standard) | – |
| Cleanliness | Higher cleanliness requirements than IPC | Higher cleanliness requirements than IPC |
PCB Assembly Processing Capability
KKPCB offers comprehensive PCB assembly services with advanced equipment and skilled technicians to ensure high-quality results. We are capable of handling SMD, DIP, BGA, Micro-BGA, QFN, and other leadless package components, supporting both prototype and mass production. Our precise assembly processes guarantee excellent placement accuracy, reliable soldering, and consistent performance across all products.
| Parameters | Capabilities for Bulk Orders | Capabilities for Trial Orders |
|---|---|---|
| Board Size | L50×W50mm ~ L510×W460mm | No restrictions |
| Board Thickness | T=0.4~4.0mm | No restrictions |
| Min. SMD Size | 01005 (inch) | 01005 (inch) |
| Max. SMD Size | 45×45mm (connector length: 150mm) | No restrictions |
| Min. IC Pin Pitch | 0.3mm | 0.3mm |
| Min. BGA Ball Pitch | 0.4mm | 0.4mm |
| Equipment Placement Accuracy | ±0.35mm @3σ | ±0.35mm @3σ |
| SMD Production Capacity | 1,000K points/day | 200 orders/day |
| DIP Production Capacity | 500K points/day | 200 orders/day |
// Perfect quality systemQuality Control Process
The perfect quality assurance system and various testing equipment help us monitor the entire production process to ensure the stability of the process and product quality. At the same time, we also introduce advanced instruments and technical methods to achieve continuous improvement.
PCB Quality Control Process
At KKPCB, quality is not just a standard—it’s our commitment. Our comprehensive PCB Quality Control Process ensures that every PCB and assembled board meets the highest industry standards for precision, durability, and reliability. By integrating advanced inspection technologies, rigorous testing protocols, and strict compliance measures, we guarantee zero-defect production and unmatched performance across all industries, including automotive, medical, aerospace, industrial, and consumer electronics.
Copper plating
Electroplating
Fully automatic electroplating line
Silkscreen laser printer
Automatic dry film coating machine
FPC cover film
Lamination machine
Driling machine
Copper plating
Our PCB Quality Control Process Includes:
1. Raw Material Inspection
- Verifying PCB laminates, copper foils, and solder masks for thickness, dielectric properties, and surface integrity.
- Ensuring compliance with RoHS, REACH, and UL safety and environmental regulations.
2. Inner Layer & Outer Layer Inspection
- Performing Automated Optical Inspection (AOI) to detect alignment errors, etching defects, and surface contamination.
- Verifying copper thickness uniformity and ensuring high-precision trace formation.
3. Drilling & Plating Quality Control
- Using X-ray drilling alignment verification to ensure accurate via placement.
- Conducting plating thickness measurements to meet conductivity and durability requirements.
4. Solder Mask & Silkscreen Inspection
- Checking for uniform coverage, adhesion strength, and proper curing to prevent delamination.
- Ensuring accurate legend printing for component identification.
5. Electrical Testing
- Conducting Flying Probe & Bed-of-Nails Testing to detect shorts, open circuits, and resistance variations.
- Ensuring signal integrity and impedance control for high-speed PCB applications.
6. Final Quality Assurance
- Performing thermal shock, humidity resistance, and mechanical stress tests for enhanced reliability.
- Ensuring every PCB meets IPC-A-600 Class 2 & Class 3 quality standards.
At KKPCB, we are committed to zero-defect PCB manufacturing, delivering high-performance, high-reliability circuit boards for applications in automotive, aerospace, medical, and industrial electronics.
PCB Assembly Quality Control Process
At KKPCB, we implement a strict, multi-step PCB assembly quality control process to guarantee that every assembled PCB meets the highest industry standards for precision, durability, and functionality. By utilizing advanced inspection technologies, rigorous testing protocols, and certified quality management systems, we ensure zero-defect production and long-term reliability for industries such as automotive, aerospace, medical, industrial, and consumer electronics.
KKPCB has dozens of SMT production lines. Advanced production equipment, strict quality control and intelligent service system to ensure the standardization and best quality of each production process.
Smart management system & Advanced production and testing equipment:
Depaneling Machine
Microboard Cleaning Machine
Wave Soldering
AOI
Smart Warehousing
Online AOI
Conformal Coating Equipment
Barcodes & QR Codes for Inventory Management
Pre-Reflow AOI Machine
X-Ray Inspection
Wave Soldering
SPI (Solder Paste Inspection)
Solder Paste SPI
Surface Mount Machine (SMT Machine)
1. Incoming Material Inspection (IQC)
- Verifying PCB bare boards, components, and solder paste for conformity with specifications (RoHS, REACH, UL, IPC standards).
- Using X-ray fluorescence (XRF) and material traceability systems to ensure component authenticity and quality.
2. Solder Paste Inspection (SPI)
- Ensuring precise solder paste volume, thickness, and alignment to prevent defects like bridging and insufficient soldering.
- Using automated SPI systems to detect inconsistencies before placement.
3. Automated Optical Inspection (AOI) – Pre & Post Reflow
- Identifying misaligned, missing, or incorrect components during placement.
- Checking for cold solder joints, insufficient solder, or bridging after reflow soldering.
4. X-ray Inspection (For BGA, QFN, and Hidden Joints)
- Detecting voids, solder balling, and hidden defects in BGA, QFN, and other leadless packages.
- Ensuring proper solder joint formation and connectivity.
5. In-Circuit Testing (ICT) & Flying Probe Testing
- Checking for open circuits, shorts, incorrect component values, and solder joint integrity.
- Ensuring electrical connectivity and proper signal transmission.
6. Functional Testing (FCT)
- Simulating real-world operating conditions to verify board functionality.
- Testing power-up, microcontroller programming, signal integrity, and load performance.
7. Final Quality Assurance & Reliability Testing
- Conducting burn-in testing, thermal cycling, humidity resistance, and mechanical stress testing for mission-critical applications.
- Ensuring compliance with IPC-A-610 Class 2 & Class 3, ISO 9001, IATF 16949, and other industry standards.
Quality checking process and description
01-Process review
Assess and inspect the particularity of the PCBA manufacturing process in advance, guide the production, and improve the quality from the process technology.
Assess and inspect the particularity of the PCBA manufacturing process in advance, guide the production, and improve the quality from the process technology.
02-IQC Incoming Quality Control
● Check whether the resistance and capacitance values are correct
● Check whether the pads on the components and the board are consistent
● Confirm whether the incoming quantity is accurate
● Check whether the components are abnormal
● Check whether the resistance and capacitance values are correct
● Check whether the pads on the components and the board are consistent
● Confirm whether the incoming quantity is accurate
● Check whether the components are abnormal
03-SPI Solder Paste Inspection
SPI can detect whether the solder paste is sufficient and uniform, which can effectively prevent production quality problems in advance caused by poor solder paste printing.
SPI can detect whether the solder paste is sufficient and uniform, which can effectively prevent production quality problems in advance caused by poor solder paste printing.
04-Online AOI Inspection
The AOI can detect the wrong solder, reverse solder, false solder, empty solder, incomplete solder, short circuit, offset, tombstone, etc. after reflow soldering. And it can also detect excessive solder, less solder, continuous solder and other undesirable phenomena in the appearance of PCBA solder joints.
The AOI can detect the wrong solder, reverse solder, false solder, empty solder, incomplete solder, short circuit, offset, tombstone, etc. after reflow soldering. And it can also detect excessive solder, less solder, continuous solder and other undesirable phenomena in the appearance of PCBA solder joints.
05-First sample test
Combined with Gerber, BOM and coordinate files, the resistance and capacitance in the completed PCBA are verified again by the first-sample tester to ensure the correctness of all parameter values.
Combined with Gerber, BOM and coordinate files, the resistance and capacitance in the completed PCBA are verified again by the first-sample tester to ensure the correctness of all parameter values.
06-Off-line AOI inspection
According to the IPC610D standard, inspect the soldered surface mount PCBA for errors, omissions, and false connections.
According to the IPC610D standard, inspect the soldered surface mount PCBA for errors, omissions, and false connections.
07-X-Ray welding inspection
Inspect the solder joints of invisible components to ensure the reliability of each solder ball of the BGA.
Inspect the solder joints of invisible components to ensure the reliability of each solder ball of the BGA.
08-QC manual inspection
Refers to the standard IPC–610 inspection standard, and the finished board is visually inspected to ensure 100 % Good products shipped.
Refers to the standard IPC–610 inspection standard, and the finished board is visually inspected to ensure 100 % Good products shipped.
// Our Quality CertificationsQuality Certifications
KKPCB quality management system is to ensure with efficient printed circuit boards which meet customer’s requirements. Our partners manufacture in compliance with, among others, the following standards:
Thanks to the materials used and advanced technology, we always ensure highest quality of our printed circuit boards!
KKPCB can provide customers with certifications in various markets, such as: EU RoHS certification, EU CE certification, US UL certification, US FCC certification, Australia SAA certification, Australia C-tick certification, Australia RCM certification, Japan PSE certification, Brazil INMETRO certification, Mexico NOM certification, Canadian IC certification, Korea lithium battery KC certification, Argentina IRAM S-mark certification, DLC certification, GS certification, CB certification, etc.
KKPCB is a professional electronic solutions provider specializing in PCB design, fabrication, assembly, and testing for Flex, Rigid-Flex, RF/Microwave, HDI, rigid multilayer boards, and ATE test boards. We deliver end-to-end services including prototyping, component sourcing, SMT/THT assembly, functional testing, enclosure assembly, and final product packaging.
With our one-stop, in-house capabilities, KKPCB provides OEM and ODM solutions, ensuring fast turnaround, high quality, and cost-effective results for clients worldwide.