There are certain steps in the production of LED circuit boards. The basic steps in the production of LED circuit boards: welding-self-inspection-mutual inspection-cleaning-friction
1. LED circuit board welding
① Judgment of the direction of the lamp: the front is facing up, and the side with the black rectangle is the negative end;
②The direction of the circuit board: the front is facing up, and the end with two internal and external wiring ports is the upper left corner;
③Judgment of the direction of the light in the circuit board: starting from the light on the upper left (clockwise rotation), it is negative positive → positive negative → negative positive → positive and negative;
④ Welding: Weld carefully to ensure that every solder joint is full, clean, and there is no missing or missing solder.
2. LED circuit board self-check
After completing the soldering, first check whether the solder joints have false soldering, missing soldering, etc., and then touch the positive and negative terminals of the circuit board with a multimeter (outer positive and inner negative), check whether the four LED lights are on at the same time, and perform Modify until all circuit boards can work normally.
3. Mutual inspection of led circuit boards
After the self-inspection, it must be handed over to the person in charge for inspection, and can flow into the next process with the consent of the person in charge.
4. LED circuit board cleaning
Brush the circuit board with 95% alcohol to wash away the residue on the board and keep the circuit board clean.
5. LED circuit board friction
Remove the LED light circuit boards from the entire board one by one, use fine sandpaper (coarse sandpaper if necessary, but with the consent of the person in charge) grind off the burrs on the side of the circuit board, so that the circuit board can be placed in the fixed seat smoothly Inside (the degree of friction depends on the model of the holder).
6, led circuit board cleaning
Clean the circuit board with 95% alcohol to remove the dust left on the circuit board during friction.
7, led circuit board wiring
Connect the circuit board with a thin blue wire and a thin black wire. The connection point near the inner circle is negative, and the black line is connected. The connection point near the outer circle is positive, and the red line is connected. When wiring, make sure that the wire is connected from the reverse side to the front side.
8. LED circuit board self-check
Check the wiring. It is required that each wire pass through the pad, and the length of the wire on both sides of the pad should be as short as possible on the surface, and the thin wire will not be broken or loose when pulled lightly.
9. Mutual inspection of led circuit boards
After the self-inspection, it must be handed over to the person in charge for inspection, and can flow into the next process with the consent of the person in charge.
10. Sophisticated led circuit boards
Separate the lines on the part of the LED circuit board according to the blue line and the black line, and energize each LED lamp with a current of 15 mA (the voltage is constant, and the current is multiplied). The aging time is generally 8 hours.