PCBA Maintenance Fixture with Rotatable Barrier Layer
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Solution Overview
Problem
During maintenance of printed circuit board assemblies (PCB′A), wet strippers used to remove conductive adhesives can infiltrate into electronic component zones, causing corrosion and leading to the scrapping of PCB′A due to their corrosive nature.
Innovation Solution
A maintenance fixture comprising a support baseplate with a stopper unit and a rotatable cover plate featuring a barrier layer that covers the electronic component zone while exposing the electrode zone, preventing the wet stripper from entering the electronic component zone.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wet stripper is used to remove conductive adhesive from electrode zone, then conductive adhesive removal is achieved, but wet stripper infiltrates into electronic component zone causing corrosion and element falling off
Solution Approach 1:
The maintenance fixture divides the PCB'A surface into two distinct zones: an electrode zone (exposed) and an electronic component zone (covered by barrier layer). This segmentation allows selective application of wet stripper only to the electrode zone where conductive adhesive needs removal, while protecting the electronic component zone from corrosive damage.
Solution Approach 2:
The barrier layer provides localized protection to the electronic component zone while allowing the electrode zone to remain exposed for adhesive removal. This local quality differentiation enables the wet stripper to perform its function on the electrode zone without causing harm to the electronic components.
2Object-affected harmful factors
If barrier layer covers electronic component zone, then protection from wet stripper infiltration is achieved, but access to electrode zone for adhesive removal is restricted
Solution Approach 1:
The barrier layer is designed to be movable rather than fixed. It can be shifted laterally along the PCB'A surface, allowing the operator to dynamically adjust the covered area. This enables the barrier layer to cover the electronic component zone during protection phases while allowing access to the electrode zone when adhesive removal is needed, by simply repositioning the barrier layer.
Solution Approach 2:
The barrier layer acts as an intermediary element between the wet stripper and the electronic component zone. It can be positioned to block the wet stripper from reaching sensitive components while still allowing the electrode zone to be accessed for adhesive removal, thus mediating between protection and operational access requirements.
Data Source
AI summary
A maintenance fixture for PCB′A and an operating method thereof are disclosed to mitigate the problems that the PCB′A may be scrapped upon removing a conductive adhesive. The maintenance fixture includes a cover plate and a support baseplate which is configured to support a PCB′A and provided with a stopper unit; the cover plate is movably connected to the support baseplate at a first end to be rotatable towards and away from the support baseplate, and is provided with a barrier layer at a first side which is perpendicular to the rotation direction and close to the support baseplate; the barrier layer is configured to be contacted with the PCB′A upon the cover plate being rotated towards the support baseplate to cover an electronic component zone and expose an electrode zone of the PCB′A.