| https://www.eptac.com/blog/5-common-solder-mistakes-and-how-to-resolve-them
you’re faced with an overheated joint, you’ll need to remove the burnt flux so it looks right. You can scrape it off with the tip of a PCB tool, or you may need to use a solution like isopropyl alcohol on a toothbrush to get the job done. Q
| https://www.smtfactory.com/What-is-the-parameter-debugging-skills-of-the-Full-auto-SMT-Stencil-Printer-id3338478.html
. Usually only need to scrape the solder paste on the stencil, leaving a single particle layer evacuated on the stencil is acceptable. The pressure of the front and back squeegee may vary depending on the condition of the squeegee
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