PCBA, that is, PCB component assembly, patch and soldering is the core link in PCBA. So, what are the precautions for PCBA processing by Shenzhen circuit board manufacturers?
一. Transportation: In order to prevent damage to the PCBA, the following should be done during transportation:
1. Storage container: anti-static turnover box.
2. Isolation material: anti-static pearl cotton.
3. Placing spacing: there is a distance greater than 10mm between the board and the board, and between the board and the box.
4. Placement height: There is a space greater than 50mm from the top surface of the turnover box.
二. Requirements for PCBA processing and washing board:
1. Board surface requirements: clean, no tin beads, no stains on component pins.
2. Devices that should be protected when washing the board: wires, connecting terminals. Relays, switches, polyester capacitors and other devices.
三. Component requirements: All components are not allowed to exceed the edge of the PCB board after installation.
四. Welding requirements:
1. In PCBA processing, electrolytic capacitors, manganese copper wires, inductors with skeletons or epoxy board bases, and transformers are not allowed to be straightened in principle, and they are required to be soldered at one time.
2. When the PCBA is processed through the furnace, due to the scouring of the pins by the tin flow, some plug-in components will be tilted after the furnace is soldered, and repair soldering personnel are required to make appropriate corrections.
3. The horizontal floating high power resistor can be righted once, and the righting angle is not limited.
4. Horizontal floating diodes or other components with component lead diameters larger than 1.2mm can be righted once, and the righting angle is less than 45°.
5. For vertical resistors, vertical diodes, ceramic capacitors, vertical fuses, varistors, thermistors, etc., if the bottom floating height is greater than 1mm, it can be righted once, and the righting angle is less than 45°; if the bottom floating height is less than 1mm , The solder joint must be melted with a soldering iron and then straightened.
