​All inspections should follow IPC‑A‑610 (Acceptability of Electronic Assemblies), Class 2 standards.

 

Inspection Equipment:

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For visual inspection of solder joints and components, the following simple tools are recommended:

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• Magnifying glass (3×–5×) – for checking solder joints, bridges, and LED orientation.

• Smartphone camera with zoom (up to ~10×) – useful for close‑up inspection and capturing photos for later review.

• Good lighting source – desk lamp or LED ring light to highlight solder fillets and component placement.

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Visual check

• Inspect solder joints for cold joints, bridges, cracks, voids, insufficient wetting, or missed connections.

• Verify the Schottky diode orientation (cathode stripe toward positive supply).

• ​Verify that the red (+) and black (–) 24 VDC power supply wires are properly connected to the corresponding input pads on the circuit board.