QC Laboratory — 10-Station Inspection & Testing Pipeline

Beyond the Production Line — The QC Laboratory

The SMT line assembles boards. The QC laboratory verifies them. These are separate physical zones in the workshop, deliberately separated to maintain the QC lab's controlled environment and to create a clear mental boundary: production builds, quality validates.

Superb Automation's QC laboratory is organized as a 10-station linear pipeline. Each station is a gate — a board must pass all applicable stations before it is cleared for shipment. The pipeline is not rigid; depending on the board's complexity and the customer's requirements, some stations are mandatory for all orders (AOI, ICT, FCT, Visual Final) and others are optional or application-specific (X-ray, Thermal Stress, Conformal Coating Inspection).

[PHOTO: Wide shot of QC laboratory — workstations arranged in linear flow, test equipment visible]

QC Pipeline at a Glance

Laboratory Environment

The QC laboratory is a controlled environment within the workshop:

• Temperature: 22 ± 2°C (tighter than production floor)

• Humidity: 45-55% RH (tighter than production floor)

• Lighting: 1,000 lux at inspection stations, 500 lux ambient

• ESD: Conductive flooring with embedded copper grid, continuous monitoring at each workstation, ionizers at static-sensitive stations

• Vibration isolation: X-ray CT and precision measurement stations are mounted on vibration-dampened tables isolated from the building structure

[PHOTO: Wide shot of QC lab showing ESD flooring, workstation layout, temperature/humidity monitor on wall]

Station Highlights

Stations 1-4: Visual and X-Ray Inspection Area

The inspection stations (SPI, AOI, X-Ray) are grouped together in a dimmable lighting zone. Reduced ambient light improves AOI camera contrast and X-ray image quality. Each station has its own monitor and operator console.

• 3D AOI station: The operator reviews flagged defects on screen — the system highlights the joint, shows the reference image side-by-side with the actual image, and suggests a defect classification. The operator confirms or overrides, then routes the board: pass to next station, or divert to rework.

• 3D X-Ray CT station: A shielded enclosure housing the X-ray source, rotation stage, and flat-panel detector. The operator manipulates the 3D reconstruction — rotating, slicing, and measuring voids. For BGA inspection, typical review time is 2-5 minutes per board depending on ball count.

[PHOTO: AOI station — operator reviewing flagged joint on dual-monitor setup] [PHOTO: X-Ray CT station — operator manipulating 3D reconstruction, BGA slice visible on screen]

Stations 5-7: Electrical Test Area

The electrical test stations (Flying Probe ICT, Bed-of-Nails ICT, FCT) are in a separate zone with dedicated power, grounding, and safety interlocks.

• Flying Probe ICT (see TAB2 article for full details): A glass-enclosed machine with 6 articulating probe arms moving at high speed. The operator loads the board onto the universal fixture frame, starts the test program, and monitors the measurement display. Test reports are generated automatically and stored per serial number.

• Bed-of-Nails ICT (for high-volume orders): A pneumatic press that lowers the fixture onto the board. The operator places the board on the fixture base, presses two-handed start buttons (safety interlock), and the machine cycles in under 5 seconds — pass/fail indicator lights green or red.

• FCT Station (see TAB2 article for full details): Custom test fixtures with integrated power supplies, signal generators, loads, and instrumentation. Each fixture is board-specific and racks into a standard test bay. The operator connects the board to the fixture, starts the test sequence, and reviews the pass/fail report.

[PHOTO: Flying Probe ICT — probes in motion over a PCB, monitor showing measurement values] [PHOTO: FCT station — custom test fixture with board connected, oscilloscope and power supply in rack]

Station 8: Environmental Test Chamber

A standalone programmable thermal chamber capable of -70°C to +180°C with controlled ramp rates. Boards are mounted on racks inside the chamber with thermocouples attached at critical locations. Electrical monitoring cables pass through sealed ports to external data loggers.

The chamber operates 24/7 for long-duration test runs (500+ cycles can take 2-3 weeks). A UPS backup ensures test continuity during brief power interruptions.

[PHOTO: Thermal chamber — door open showing board rack, temperature controller panel]

Station 9: Ionic Contamination Test Bench

A dedicated wet-chemistry bench for ROSE (Resistivity of Solvent Extract) testing. Includes:

• Test cell with circulating pump for solvent extraction

• Conductivity meter with temperature compensation

• Solvent handling station (IPA/DI water mixture)

• Chemical storage cabinet with ventilation

(Full testing procedure in TAB2 article.)

[PHOTO: Ionic contamination test bench — test cell, conductivity meter, solvent bottles]

Station 10: Visual Final Inspection

The last QC station and the only one that requires significant human judgment. Each inspector works at a dedicated station with:

• Stereo zoom microscope — 10× to 40× magnification, ring light illumination

• Digital microscope camera — captures images for the inspection report

• Barcode scanner — verifies serial number against the production traveler

• Digital calipers / height gauge — dimensional verification

• ESD-safe work surface with wrist strap monitor

• Inspection checklist — printed or on-tablet, with sign-off for each item

The inspector examines every board against the IPC-A-610 criteria appropriate to the order's class (Class 2 or Class 3). The checklist covers solder joint appearance, component alignment, coating coverage, label readability, and packaging compliance. The inspector's sign-off is the final authorization before a board ships.

[PHOTO: Final inspection station — operator at microscope, board under examination, checklist visible]

Test Report Archiving

Every test station generates digital reports. These are stored per production lot and per serial number in Superb's quality database. Customers receive:

• Standard: Pass/fail summary with station-by-station status

• Detailed (on request): Full measurement data — ICT component values, FCT test step results, X-ray void measurements, thermal cycle log, ROSE test conductivity readings

Reports are retained for the duration of the customer relationship. For customers with regulated products (medical, aerospace), reports can be archived for the required retention period.

Continue the factory tour: SMT Production Line | Facility & Environment | Warehouse & Logistics