Author Archives: WorkingBear


Dec05
Both solder joint bridging and open solder joint happen at same BGA?

發表於 December 5, 2018

Is that possible both solder joint bridging and open solder joint defect happen at same BGA (Ball Grid Array) or CSP (Chip Scale Package) device? It is hard to see both solder joint bridging and open solder joint defect happen … Continue reading →

Process, Quality, Soldering     WorkingBear    Views (150)     comment (0)
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Nov14
How to print solder paste on PC Board and screen printing notices?

發表於 November 14, 2018

Printing the solder paste on the PCB (Printed Circuit Board) and go through reflow oven to re-melt the solder paste and solder the electronic components on PCB is most common process in today’s electronics manufacturing industry. Printing the solder paste … Continue reading →

SMT, Soldering     WorkingBear    Views (422)     comment (0)
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Jun19
Increase solder paste volume will improve the MLCC capacitor broken?

發表於 June 19, 2017

Recently WorkingBear got complaint from R&D and ask increase the solder paste volume on the MLCC (Multi-Layer Ceramic Capacitor)  component pads to improve the capacitor broken issue. R&D said he had verified that the capacitor’s footprint in the board design … Continue reading →

Design, Manufacture, PCB, Quality, Reliability, SMT, Soldering     WorkingBear    Views (1,573)     comment (0)
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Jan05
Comparison between shielding-can directly mount and shielding-clip/frame

發表於 January 5, 2017

Recently one of my top manager ask to mount the shielding-can or call shielding-cover directly on the Printed Circuit Board to instead of mount the shielding-clip or call shielding-frame on the board first then cover the shieling-can. He said this … Continue reading →

Design, Manufacture, SMT     WorkingBear    Views (1,890)     comment (0)
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May03
Trouble Shooting Guide for Plastic Injection

發表於 May 3, 2016

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 … Continue reading →

Plastic, Quality     WorkingBear    Views (1,307)     comment (0)