Vehicle Tracking System, Electric Vehicle Gps Tracker Pcb Assembly Manufacturer From China
Product general process requirements:
Power IC: In the secondary product series, when the material of LP2985-50DBVR is used, the silk screen must be dotted with a horizontal bar as a defective product.
Shield: The size of the shield must meet the requirements of the drawings. If there is a deviation in the dimensional requirements, the result of the engineering confirmation shall prevail.
PCB board: The surface of the PCB surface of the black oil solder mask cannot be scratched or damaged. It is operated according to the "PCB inspection standard". If there is a black oil PCB board, it is judged as a defective product.
Solder paste printing: In addition to the requirements of conventional tin printing, it is necessary to confirm the printing of tin on the LED pad, and it is not necessary to reduce the leakage of tin E.
Use machine patch: This process must be confirmed for mounting. The surface of the LED lamp cannot be broken and scratched by the machine nozzle. The surface of the LED lamp can be confirmed with a microscope of 60 times or more.
Reflow oven: When the LED lamp board is over the furnace, the furnace temperature must be tested with the corresponding PCB test board. The maximum temperature must meet the temperature resistance requirements of the LED lamp.
Post-furnace quality inspection: 1. Solder on the pad: The tin on the heat-dissipation pad at the bottom of the chip LED must reach 80% or more, and less than 80% is a defective product. Every time it is produced, it needs to be inspected. 捡, batch sampling by 3%. 2, LED surface requirements: The phosphor layer on the surface of the LED can not be damaged, if it is slightly damaged, it is a defective product. 3. When the single product process requires testing, short circuit and power-on test must be performed.
Welding and cleaning: 1. The operation process is not allowed to touch the surface of the LED to prevent damage caused by the fluorescent layer of the LED. 2. The LED lamp board cannot leave rust, tin slag and other dirt. 3, can not use the washing water to clean the LED lights, dirty, industrial alcohol can be used to carefully clean the LED around. 4. When cleaning the shield, it must be cleaned with wash water. Ultrasonic can only clean the entire LED panel with industrial alcohol. 5, A10 customers with SMT process PCBA, need ultrasonic to take industrial alcohol cleaning, mainly to clean the residual rosin and tin slag