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Precautions during PCBA production
A normal and complete PCBA production line is equipped with solder paste printing machine, placement machine, reflow soldering, wave soldering, AOI detector, ICT online tester and other equipment. What should we pay attention to during the PCBA processing of so many equipment?

1、 PCBA processing plate washing requirements
The board surface shall be clean and tidy without tin beads, component pins and stains. In particular, no dirt left by welding should be seen at the solder joint of the plug-in surface. When washing the board, the following devices must be protected: wires, connecting terminals, relays, switches, polyester capacitors and other corrosive devices, and the relay must not be cleaned with ultrasonic wave.

2、 About Edges
All components shall not exceed the edge of PCB after installation.

3、 When PCBA is processed
As the pins of plug-in components are washed by tin flow, some plug-in components will tilt after being welded in the furnace, resulting in the component body exceeding the screen frame, so the repair welding personnel after the tin furnace are required to correct it properly.

(1). The horizontal floating high power resistor can be righted once, and the righting angle is unlimited.
(2). Horizontal floating diode (such as DO-201AD packaged diode) or other components with pin diameter greater than 1.2mm can be righted once, and the righting angle is less than 45 °.
(3). Vertical resistor, vertical diode, ceramic capacitor, vertical fuse, varistor, thermistor, semiconductor (TO-220, TO-92, TO-247 packaging), the component body with a floating height of more than 1mm can be righted once, and the righting angle is less than 45 °; If the floating height of the bottom of the element body is less than 1mm, the solder joint must be melted with a soldering iron and then straightened, or the element must be replaced with a new one.

4.In PCBA processing, electrolytic capacitors, manganese copper wires, inductors and transformers with framework or epoxy plate base are not allowed to be straightened in principle. They are required to be welded at one time. If there is tilt, it is required to use soldering iron to melt the solder joint and then straighten it, or replace new components.

5、 Packaging
In order to prevent PCBA from being damaged, the following packaging should be used during transportation: anti-static turnover box is generally used for containers; The isolation material is anti-static pearl cotton. The placement distance should be more than 10mm between PCBs and between PCBs and boxes. The placement height must be more than 50mm from the top surface of the turnover box to ensure that the turnover box is not pressed against the power supply, especially the power supply with wire.