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What are the detection links of SMT line?
1.
There are many kinds of patch inspections, starting from silk screen printing, including silk screen inspection, pre-furnace patch inspection, and post-furnace inspection, all of which can be inspected by AOI. The inspection benchmarks are set according to the requirements of each company.
2.
With the development of smt and the improvement of smt assembly density, as well as the thinning of circuit patterns, the finer pitch of smd, and the enhancement of features such as non-visualization of device pins, it brings about the quality control of smt products and the corresponding inspection work. many new problems. At the same time, it has become more and more important to adopt appropriate testability design methods and testing methods in the smt process.
3.
Detection is an important link to ensure the reliability of smt. The content of smt inspection technology is very rich, and the basic content includes: testability design; raw material incoming inspection: process inspection and component inspection after assembly.
(1) Testability design: It is mainly the testability design of the pcb circuit carried out in the design stage of the patch processing circuit, which includes the test circuit, the test pad, the test point distribution, the testability design of the test instrument, etc.
(2) Inspection of incoming raw materials: including inspection of PCBs and components, as well as inspection of all smt assembly process materials such as solder paste and flux.
(3) Process inspection: including process quality inspection of printing, patch, welding, cleaning and other processes. Component testing includes component appearance testing, solder joint testing, component performance testing, and functional testing.
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