Before introducing the PCBA semi-finished product inspection standard, let us first understand the definition of PCBA semi-finished product inspection standard:

①Class A unqualified: defects that cause harm to human body or machinery or endanger life safety, such as non-compliance with safety regulations, burn-in, electric shock, etc; . ③Class C unqualified: does not affect product function and service life, some defects in appearance and minor defects or differences in mechanism assembly.

The inspection method is: you must wear protective gloves or finger cots, and wear an electrostatic bracelet to work. Place the product to be inspected about 25cm away from the eyes, 45 degrees up, down, left, and right, and inspect it visually or with a three-fold magnifying glass.

The following Sanjing briefly introduces the inspection items and inspection methods for everyone:

The main inspection items for SMT parts are as follows: 1. Cold welding of solder joints: Use a toothpick to lightly touch the pin of the part. If it can be moved, it is cold welding. 2. Reverse or wrong polarity: cause burning or explosion. 3. Turnover: the text face down. 4. Side standing: chip element length≤3mm, width≤1.5mm, no more than three. 5. Tombstone: The end of the chip component is lifted. 6. Part foot offset: the side offset is less than or equal to 1/2 of the weldable width. 7. Floating height: the distance between the bottom of the component and the substrate is less than 1mm. 8. The feet are high and tilted: the height of the tilting> the thickness of the part feet. 9. The heel is not flat: the heel does not eat tin. 10. Body damage: The capacitor is damaged, exposing the internal material. 11. Soldering point tin tip: the height of the tin tip is greater than the height of the part body. 12. The amount of tin eaten: too much or too little.

The main inspection items for the board are: 1. Crystallization phenomenon: there are white residues on the surface of the PCB board, soldering ends or around, and white crystals on the metal surface. 2. The surface of the board is not clean: the surface of the board is not clean, dirty or has residue. 3. PCB with foreign matter: conductive foreign matter can easily cause short circuit.

The above is about the content of PCBA semi-finished product inspection standards, I hope it can be helpful to everyone!