Nuclear Services / Engineering Services

Tin Whisker Inspection and Printed Circuit Board Cleaning Services

Background A digital photograph of the PCB both pre- and post-inspections will be included in the final Westinghouse will test and repair customer- report. provided printed circuit boards (PCBs), even when the boards were not designed or All defect conditions found will be identified and documented on a board-specific basis. The supplied by Westinghouse. The boards will be following defects can be identified, although the inspected by a certified IPC-A-610 specialist inspection is not limited to this list: (CIS), who will identify and remove any tin whisker formations, which are small metal yy Tin whisker(s) hairs that can grow between metal solder yy Cold solder joints pads, and then re-inspect the boards. yy Inadequate circumferential wetting Description yy Insufficient solder fill, excess solder Westinghouse’s PCB testing and repair service yy Violation of electrical clearance is based on an IPC-A-610 inspection for yy Mounted hardware (connectors, mounting defect conditions, and performed to IPC Class hardware) defects or damage 2 inspection criteria. (If Class 3 or Class 1 yy Circuit trace damage inspection standards are required, the customer will have to specifically identify the acceptability yy Component damage class requirements for each PCB submitted yy Laminate conditions (blistering, delamination, to Westinghouse.) The IPC-A-610 Class measling and crazing) identifications are: yy Cleanliness yy Class 1: General electronics products yy Gold finger cleanliness and condition yy Class 2: Dedicated service electronic products yy Flux residue on electrical mating surfaces yy Class 3: High performance electronic products yy Heat Damage yy Other IPC defect identified during inspection

June 2013 NS-ES-0253 ©2014 Westinghouse Electric Company LLC. All Rights Reserved Any identified defect will be evaluated, and a Benefits recommended corrective action will be given. These Westinghouse standard PCB inspection and repair corrective actions may include product testing due to service practices include: the nature of the repair recommended. All testing of yy Inspection per IPC-A-610, Revision E, Class 2 product performance after inspection, cleaning and/or acceptance standards pre-authorized repair will be the responsibility of the customer. yy Electrostatic discharge sensitive component controls in accordance with ANSI/ESD-S-20.20 Westinghouse will provide all standard and calibrated equipment, such as oscilloscopes, electronic loads, yy All repairs performed per repair and rework digital voltmeters, and DC and AC power supplies standard IPC-7711/7721 if required and approved (50 AND 60 Hz), while the customer will provide all by customer required test procedures, unique test fixtures and Westinghouse inspection and repair service capabilities cabling necessary to test the PCBs. include: yy All technicians certified IPC specialists (CISs) in one or more of the following IPC standards: --IPC-A-610 --IPC/WHMA-A-620 --IPC J-STD-001 (surface mount and through-hole technologies) yy On-site certified IPC trainers (CITs): --Two CITs for IPC-A-610 --One CIT for IPC/WHMA-A-620

IPC inspection --One CIT for IPC-J-STD-001 yy On-site MicroBlaster® to remove conformal coatings yy On-site Huntron® Tracker for diagnostic troubleshooting yy On-site digital zoom magnification (1:1 to 200x) inspection camera yy IPC-7711/7721 repairs: --Traces, lands, pads, eyelets and plated through holes --Gold finger replacement or re-plating --Bow and twist repair --Delamination/blister repairs

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