Technet,

PWA's experienced solder wetting difficulties to plated through holes
including via's during the wave solder process. PWA's are two sided
multilayer finished with Electroless Nickel Immersion Gold (ENIG). Top
side SMT components were reflowed and bottom side SMT and through hole
components were wave soldered.

SEE PICTURES of bottom side of PWA at this website.

http://www.ripus.com/images/pwa/index.htm

Does anyone know what may have caused this issue?

Regards,
Frank Norman
Manufacturing Support Engineer
Raytheon, Space and Airborne Systems (SAS)
(805)879-2745
[log in to unmask]

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