Typical Issues and Solutions for PCB Assembly

 Standardize Procedures: Use checklists aligned to IPC-A-611/AS9100 (e.g. LCR meters for active components and ICT for passive devices) for visual inspection and automated tests.

Leverage technology: Implement XRF spectrometers to analyze material composition, automated optical inspection for high-volume runs and thermal chambers to screen for reliability.

Supplier collaboration: Implement the PPAP (Production part Approval Process), and conduct regular audits, to ensure traceability. This will reduce the risk of counterfeit parts or non-conforming components.

 Solder Paste Printing Stage

PCBA | solder paste | assembly | AOI | ICT | circuit design

Defects in Solder Paste Deposit :An incorrect stencil design, or excessive wear of the stencil; an uneven squeegee or abnormal angle or pressure; an abnormal paste viscosity; or inadequate agitation when printing can cause localized over/under-deposition. Insufficient thickness can cause cold joints and compromise the mechanical strength of solder joints.

Insufficient Paste/Missing Paste: No paste on pads or partial omission may result from clogged stencil apertures, PCB misalignment, excessive squeegee speed, or inadequate stroke.  Manual rework is necessary for open circuits or functional faults brought on by missing solder joints.

Bridging/Excessive paste: Inadequate squeegee pressure, low paste thixotropy or excessive humidity diluting paste, and aperture spacing smaller than IPC-7525 norms might cause paste to join adjacent pads or overlap onto the solder mask.

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