Efficient Evaluation of PCB Board Quality without Testing Tools
When assessing the quality of a PCB board without specialized testing tools, several visual inspection methods can be employed. Here’s a step-by-step guide to quickly judge the quality of a PCB board:
- Dimensions and Thickness:
- Verify that the dimensions and thickness align with the specified external measurements without any deviation.
- Surface Inspection:
- Ensure the circuit board surface is free from defects, deformations, shedding, scratches, open circuits, short circuits, oxidation, white or yellow discoloration, excessive etching marks, and impurities such as dirt or copper particles.
- Ink Covering Layer:
- Examine the ink covering layer for uniformity, brightness, absence of shedding, scratches, copper dew, deviation, printing plate issues, and any impurities.
- Screen Printing:
- Check for clear and accurate signs and letters in screen printing, ensuring there are no omissions, blurriness, inversions, or deviations.
- Carbon Film Examination:
- Inspect the carbon film for defects, deviations, short circuits, open circuits, and reverse printing.
- Bottom Plate Evaluation:
- Assess the PCB bottom plate for proper forming, with no leakage, deviation, hole collapse, cutting edge issues, plug holes, beer burst, beer reaction, or crushing.
- Edge Smoothness:
- Check the smoothness of the PCB edges, paying attention to symmetry in the case of V-shaped cutting processes, ensuring it doesn’t lead to wire breaks.
By thoroughly examining these six key aspects, you can swiftly and effectively gauge the quality of a PCB board, even in the absence of specialized testing tools.