Category Archives: Quality


Jul22
What purpose of alloy metal of Cu, Ag, Zn, Sb, Bi added to solder paste?

發表於 July 22, 2021

Tin (Sn) based solder is still the best material for PCB (Printed Circuit Board) assembly in the modern industry today. The only difference is the lead (Pb) free from the solder base due to environmental concerns. The melting point of … Continue reading →

Process, Quality, SMT, Soldering     WorkingBear    Views (2,802)     comment (0)

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

發表於 December 5, 2018

Is that possible for both solder joint bridging and open solder joint defect occur in the same BGA (Ball Grid Array) or CSP (Chip Scale Package) device? It is rare to observe both solder joint bridging and open solder joint … Continue reading →

Process, Quality, Soldering     WorkingBear    Views (5,275)     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 (4,857)     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 (2,890)     comment (0)

Jun24
Case study for the mold-in insert screw boss broken

發表於 June 24, 2015

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 →

Design, Plastic, Quality     WorkingBear    Views (8,974)     comment (0)
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