Olivia:
- Re the hole fill question.  Presuming that you are using IPC-A-610C as the
acceptability standard for visual inspection, please note that the 50% hole
fill is Acceptable for Class 2 ONLY when: 1) the partial hole fill is caused
by thermal planes or conductor planes internal to the PWB, 2) solder wetting
is 100% of the circumference of the lead and PTH wall on the secondary side,
and 3) surrounding PTH's meet the requirements of Table 6-2.
- Bottom line, if you meet the criteria above, and can comply with Criteria A
of Table 6-2 then the condition is Acceptable.  If you don't meet 1), 2), &
3) above and/or can't visually confirm that you meet Criteria A (180 degrees
of circumferential wetting on primary side [solder destination side] of the
lead and barrel) then the condition must be considered a Defect.
- Hope the above helps.  If not call (317.773.5570)and we can discuss it
further.
Regards, Jim Moffitt, Moffitt Consulting Services

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