Explain the SMT process for PCB. What are the checks and testing you will ensure to make your product defect free.

Question

Accepted Answer

SMT process involves placing surface mount components on PCB. Testing and checks include AOI, X-ray, ICT, and functional testing.

Solder paste is applied to the PCB pads
Components are placed on the solder paste using pick and place machines
The PCB is then heated in a reflow oven to melt the solder paste and attach the components
Automated Optical Inspection (AOI) is done to check for any defects in component placement and solder joints
X-ray inspection is done to check for any hidden defects such as solder voids
In-Circuit Testing (ICT) is done to check the functionality of the PCB
Functional testing is done to ensure the product meets the required specifications
Quality control measures are put in place to ensure the process is repeatable and consistent

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