GPS locator circuit board assembly
Printed circuit board, often use abbreviations—— PCBA, is an important electronic parts, is the support of electronic components,the provider of the electronic circuit connection.Because it is produced by using electronic printing technology, it is called "printed" circuit board.Before appears in the printed circuit board, electronic components of interconnection between relied on wires connected directly and form a complete circuit.
PCBA appearance inspection instructions
1,The lack of components: In the corresponding position, no solder components in accordance with the requirements.
2,dry soldering: component not tin or the tin is less than three-quarters of the solder joint area (SMT components for the solder area is less than the width of 1/2 of component).
3,continuous tin electrodeposit: due to abnormal operation, connect of two point which are disconnected on the electrical with tin.
4,Error components: the components which is soldered on board is not match with the BOM.
6,Cold welding: welding surface is gray, no wetting well.
9,Positive and negative solder wrong
10,Open circuit: Component’s pins are disconnected or the PCBA board line is disconnected.
12,Excess components: The file indicates the location of a component without the presence of components on the PCBA board.
13,Tin cracking: usually after the solder joint is subjected to external force, the solder joint and the component lead are separated, which has an impact on the welding effect.