8. Photosensitive Green Oil: Grinding the board → Printing photosensitive green oil → Molding the board → Developing the film → Grinding the board → Printing the board → Baking the board → Inspection Purpose: Photosensitive green oil is used to transfer the pattern from the green oil film onto the board, serving to protect the circuitry and prevent soldering.
9. Characters: After final application of green oil → Cool and let stand → Adjust the screen → Print characters → Re-apply for mounting → Check Purpose: Characters are easily identifiable symbols that serve as indicators when installing electronic components.
10. Gold-plated fingers: Plate the plug → Degrease → Wash twice with water → Micro-etch → Wash twice with water → Pickling → Copper plating → Wash with water → Nickel plating → Wash with water → Gold plating to make it more hard and wear-resistant. The purpose is to plate a layer of nickel and gold of the required thickness on the plug fingers.
11. Tin-plating board: micro-etching → air drying → preheating → rosin coating → solder coating → hot air leveling → air cooling → washing and air drying to protect the copper surface from corrosion and oxidation. The purpose of tin plating is to spray a layer of lead-tin onto the bare copper surface that is not covered with solder resist.
12. Forming: This is divided into milling plates and die-cut plates. The purpose is to use molds or CNC milling machines to mill out the shapes required by customers. Milling machine plates and die-cut plates have higher precision, while hand-cut plates can only produce some simple shapes.
13. Testing: Upper mold → Plate placement → Testing → Pass → FQC visual inspection → Fail → Repair → Retest → OK. Visual inspection may not easily detect open circuits. The purpose is to pass 100% electronic testing to detect defects such as short circuits that affect functionality. It is mainly divided into test rack testing and flying probe testing.
14. Final Inspection: Incoming material inspection → visual inspection → qualified → FQA spot check → qualified → packaging → unqualified → handling → inspection → OK and repair minor defects. The purpose is to prevent problematic and defective boards from being released by 100% visual inspection of the appearance defects of the boards.
The process involves a series of steps.
Every mistake at any step will result in the scrapping of raw materials.
Fortunately, Director Liao's factory was no pushover; it was very capable.
Having collaborated with Qimingxing for so many years, their capabilities are beyond question.
One month later.
The first batch of electronic versions was shipped to the Qimingxing factory.
Meanwhile, Qian Wang in the production workshop organized the workers to begin assembly.
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