Category Archives: Quality
Jun19
Will Increasing Solder Paste Volume Help Prevent MLCC Cracking?
Figure: Will Increasing Solder Paste Volume Help Prevent MLCC Cracking? Recently, Workingbear received a complaint from R&D asking us to increase the solder paste volume on the MLCC (Multilayer Ceramic Capacitor) component pads to improve a capacitor cracking issue. R&D … Continue reading
May03
Trouble Shooting Guide for Plastic Injection
Trouble Suggested Remedies (Solutions) DIMENSIONAL PROBLEMS Shot-to-shot dimensional variations Increase injection pressure Maintain uniform pad (cushion) Repair leaking back flow value if pad cannot be maintained Increase screw forward time Maintain uniform cycle Eliminate un-melted particles (see below) Use larger … Continue reading
Jul01
Why do thinner PCBs will need carrier for reflow process?
As the career of Manufacturing Process Engineering(MPE), WorkingBear has noticed a constant battle between Designers, Marketers, and Manufacturers. Marketers always want thin, modern design that look thin. Designers think fabrication is simple, while Manufacturers want strong, robust, sturdy assemblies that … Continue reading
Jun24
Case study for the mold-in insert screw boss broken
In a previous discussion, WorkingBear identified potential root causes for screw boss cracking after mold-in screw nut insertion. Following a complaint from the field, we asked EMS and the plastic injection supplier to double-check their inventory and found that approximately … Continue reading
Jun10
PCB rework: Selective solder mask removal by laser
As an engineer in the electronics manufacturing industry, have you ever encountered the need to rework a printed circuit board (PCB) to remove the solder mask? If so, how did you approach this problem? Traditionally, the solder mask is manually … Continue reading
