Focustek Manufacturing Services Interview Questions and Answers

Q1. Are you aware about AOI machine and SMT process
Ans. 
Yes, AOI machine stands for Automated Optical Inspection machine used in SMT process for quality control.
• AOI machine is used in Surface Mount Technology (SMT) process to inspect the quality of printed circuit boards (PCBs).

• It uses cameras and lighting to detect defects such as missing components, misalignment, soldering issues, etc.

• AOI machine helps in improving the quality and reliability of electronic products by ide...read more
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Q2. Is spc is applicable in AOI machine ?
Ans. 
Yes, SPC (Statistical Process Control) is applicable in AOI (Automated Optical Inspection) machine.
• SPC can be used in AOI machines to monitor and control the quality of the inspection process.

• It helps in identifying trends, variations, and abnormalities in the inspection data.

• By using SPC, manufacturers can ensure consistent quality and make data-driven decisions for process improvement.

• Examples of SPC tools that can b...read more
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Q3. If nozzel is dropping a lot of component during mounting and showing less then how would you control on that
Ans. 
To control component dropping from nozzle, ensure proper maintenance, calibration, training of operators, and monitoring of process parameters.
• Regular maintenance of the nozzle to prevent wear and tear

• Calibration of the equipment to ensure accurate placement of components

• Training of operators on proper handling and adjustment of the machine

• Monitoring process parameters such as speed, pressure, and temperature to identi...read more
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Q4. What is the role of MSA is a job work company
Ans. 
MSA (Measurement System Analysis) plays a crucial role in ensuring the accuracy and reliability of measurement systems in a job work company.
• MSA helps in evaluating the measurement processes and equipment used in production.

• It ensures that the measurement systems are capable of providing accurate and consistent results.

• MSA helps in identifying and quantifying sources of variation in the measurement system.

• It assists in...read more
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Q5. What is the difference between poision test and MSA
Ans. 
Poison test is used to determine the toxicity of a substance, while MSA (Measurement System Analysis) is used to assess the measurement system's capability and reliability.
• Poison test is conducted to determine the toxicity level of a substance, usually in the context of chemicals or drugs.

• MSA is performed to evaluate the measurement system's accuracy, precision, repeatability, and reproducibility.

• Poison test focuses on...read more
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Q6. What is main difference between 3D AOI machine and and 2D AOI machine
Ans. 
3D AOI machines use height information to detect defects, while 2D AOI machines only use 2D images.
• 3D AOI machines use height information to detect defects, providing more accurate inspection results.

• 2D AOI machines only use 2D images, which may lead to missing defects that are not visible in 2D.

• 3D AOI machines are more expensive but offer higher precision and reliability compared to 2D AOI machines.

• Examples: 3D AOI ma...read more
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Q7. What kind of defects detected in ICT machine
Ans. 
Defects detected in ICT machine include soldering issues, component placement errors, shorts, opens, and incorrect values.
• Soldering issues: incomplete or poor quality solder joints

• Component placement errors: components placed in the wrong location or orientation

• Shorts: unintended connections between two points causing a short circuit

• Opens: lack of connection between two points causing an open circuit

• Incorrect values: c...read more
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Q8. If any IC pin is detectable in coverage report then how will you ensure the product is defect free
Ans. 
Ensuring defect-free product with detectable IC pin in coverage report
• Investigate the root cause of the detectable IC pin, such as design issue, manufacturing defect, or testing error

• Implement corrective actions based on the root cause analysis to address the issue

• Perform thorough testing and verification to ensure all IC pins meet the required quality standards

• Utilize advanced testing techniques like boundary scan tes...read more
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