Management of Outsourced PCBA Processing Inspections
Introduction: For companies that have their PCBA manufactured by outsourced SMT factories, it is not sufficient to simply hand over the manufacturing requirements and expect good quality without oversight. Discovering issues only at the end of the process is too late for effective remediation. A crucial aspect is that a series of steps during the manufacturing process require supervision and reminders to minimize subsequent problems. For example: Are the correct auxiliary materials being used as per customer requirements? Are the required inspection actions being performed adequately? Are the materials that need to be baked being baked for the correct duration? Are any temporary issues during production being clearly communicated and promptly addressed?
1. Purpose
By strengthening on-site supervision and inspection at the source of manufacturing, we can promptly identify and report relevant quality issues, ultimately ensuring the quality of PCBA processing.
2. Scope of Application
This guideline is applicable only to the manufacturing sites of the outsourced SMT factories that our company collaborates with.
3. Responsibilities
1. Factory: Designate several IPQC personnel to conduct on-site inspections, supervision, and feedback.
2. SMT Outsourced Factory: Cooperate with our IPQC personnel for on-site inspections and timely improvements.
4. Overall Process Description and Workflow Diagram
When there is a batch of production orders being processed by the SMT outsourced factory, and during the production period (such as during SMT placement or wave soldering), our factory will dispatch 1-2 IPQC inspectors to conduct on-site inspections, supervise the production process, and provide relevant feedback and records.
*Whether on-site inspection supervision is required for this batch of products and the number of days for follow-up inspections will be determined by factors such as the quantity, importance, and urgency of the products. The quality manager of the process department will assess and arrange accordingly.
5. Example of Inspection Content
1. Management: Check whether the materials that need baking have been properly treated, whether materials on-site are disorganized affecting quality, whether static electricity requirements are met, and other relevant parameters that should be recorded.
2. SMT Manufacturing: Check if production is carried out according to requirements, whether appropriate automatic equipment is used for inspection, whether there are changes in temperature curve consumables, handling of defective products, on-line sampling, and follow-up checks after inspections.
3. Wave Soldering Manufacturing: Check for changes in wave soldering parameters, flux, compliance of pre-soldering components, post-soldering appearance inspections, specifications for handling defective products, on-line sampling, and follow-up checks after inspections.
4. Process Turnover: Check for abnormalities in the turnover process from the SMT workshop to the wave soldering workshop, and whether the placement method on the turnover rack poses risks of collision or deformation.
5. Packaging: Ensure that the packaging materials and methods meet protection and transportation requirements, and check for risks of collision.
6. Feedback and Records
1. Feedback:
1.1. During normal inspections, if any abnormal quality issues are found, promptly report them internally to the responsible person at the processing factory, such as the foreman, team leader, or other responsible personnel, and follow up to ensure resolution.
(For example, if soldering issues are found in a completed sub-batch of PCBA, highlight the rework, key positions and standards for appearance inspection, specifications for operations during repairs, and other quality-affecting issues on-site.)
1.2. If internal feedback cannot be addressed promptly, escalate the issue to the technical department’s process manager.
(For example, if quality issues raised with the SMT outsourced factory are not corrected or cannot be communicated, such as failure to rework inspections as required, packaging not being executed as specified, or other quality-related issues being ignored.)
2. Records: After completing the product follow-up inspection for the day, fill out the “PCBA Inspection Record Form”.
7. Process Flow Diagram
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