{"id":2852,"date":"2022-12-29T14:50:00","date_gmt":"2022-12-29T06:50:00","guid":{"rendered":"https:\/\/www.qhsmt.com\/?p=2852"},"modified":"2023-05-17T17:12:49","modified_gmt":"2023-05-17T09:12:49","slug":"smt-pick-and-place-machine-manual-visual-inspection-plays-a-very-important-role-in-pcba-processing","status":"publish","type":"post","link":"https:\/\/www.qhsmt.com\/zh\/2022\/12\/29\/smt-pick-and-place-machine-manual-visual-inspection-plays-a-very-important-role-in-pcba-processing\/","title":{"rendered":"Manual visual inspection plays a very important role in PCBA processing"},"content":{"rendered":"

Today author from QiHe smt pick and place machine sharing you with some tips about manual visual inspection in PCBA processing<\/p>\n\n\n\n

At present, in the process of PCBA processing, the manual visual inspection is mainly through the naked eye or with some relatively simple optical magnification instruments.
Manual visual inspection of PCB solder paste printing and solder joints,
This is a low-investment and effective method,
For manufacturers with low process requirements and imperfect equipment and testing equipment,
Manual visual inspection plays an important role in improving the quality of assembled products.<\/p>\n\n\n\n

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Manual visual inspection includes:
Manual inspection of printed PCB,
Manual visual inspection of glue dots,
Manual visual inspection of solder joints
Visual inspection of printed PCB surface quality, etc.<\/p>\n\n\n\n

Manual visual inspection is the first thing to do after solder paste printing, component placement and soldering.
The main detection contents are as follows:<\/p>\n\n\n\n

(1) Solder paste printing.
First check whether the parameter setting of the solder paste printing machine is correct,
The solder paste of the PCB is printed on the pad, whether the height of the solder paste is consistent or presents a “trapezoidal” shape,
The edges of solder paste should not have rounded corners or collapse into a pile,
However, it is allowed to have some peak shape caused by pulling up a small amount of solder paste when the slab is detached,
If the solder paste spreads unevenly,
It is necessary to detect the solder paste on the scraper,
whether lacking or unevenly distributed,
At the same time, it is also necessary to check the printed steel plate and other parameters.
Finally, check under the microscope whether the solder paste is bright after printing.<\/p>\n\n\n\n

QHSMT is an enterprise specializing in the production of SMT equipment, like pick and place machine \uff0creflow oven\uff0cstencil printer \uff0cwelcome to send inquiry.<\/p>\n\n\n\n

(2) Component placement.
Before the first PCB with solder paste on it starts to place components,
Before printing, confirm whether the rack is placed securely,
Whether the components are correct and whether the picking position of the machine is correct.
After completing the first PCB,
Check in detail whether each component is correctly placed and lightly pressed in the center of the solder paste,
Instead of just “putting” on top of the solder paste.
If the solder paste can be seen in the microscope with a slightly sunken posture, it indicates that the placement is correct.<\/p>\n\n\n\n

Whether all the components on the data list are the same as the components on the PCB,
All components that are sensitive to positive and negative poles,
For example, diodes, tantalum electrolytic capacitors and ICs,
Whether the orientation of these components is correct.<\/p>\n\n\n\u9605\u8bfb\u66f4\u591a\uff1aManual visual inspection plays a very important role in PCBA processing<\/span><\/a>\n\n\n

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