Bob

We are currently doing XRAY Inspection of BGAs. The XRAY TestEngineer
noticed that solder ball size on outer rows is different from the ball size
on inner core areas. 
"We are still seeing a bi-modal data distribution of ball volume between the
middle and periphery balls? Is that normal for BGAs. "

I would appreciate your expert comments as there is not much XRAY related
information on web.

Regards

Ashok Dhawan
Manuf. Specialist
Parker hannifin Electronic Controls
Winnipeg Canada
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