Phil,

Obviously your choice depends on your own yields and confidence level.  We
use 2DX as a process monitor tool- of course we are backing up the process
with an Agilent 5DX 3D x-ray tool for solder joint inspection.
We are not worried about low volume or shorts due to the process control of
the screen print process.  Missing balls (very rare) are caught by the
placement equipment.  Our only worries are then reduced to whether the parts
have poor solderability, and if the reflow oven is set up correctly.  Thus
we run our first five articles through 2DX to check questionable
solderability of components that often result in the formation of voids and
can be easily picked up by our 2D machine.  Once the process is set up
correctly, we sample every 10th board to ensure parameters have not changed.

Steve Abrahamson

> -----Original Message-----
> From: Phil Bavaro [SMTP:[log in to unmask]]
> Sent: Tuesday,June 19,2001 11:01 AM
> To:   [log in to unmask]
> Subject:      [TN] BGA Xray Inspection:  100% or SPC controlled
>
> Here is a question that many of you have had to deal with.......
>
> Do you xray image inspect 100% of your BGA solder connections
>
> or
>
> do you only process a sample of your production volumes thru xray
>
> or
>
> do you not require xray inspection unless a test failure occurs on the
> board?
>
>
> We have bgas on close to all of our boards these days and even with
> inline automatic xray equipment, it is becoming a bottleneck for
> production.
>
> I hesitate to release my xray inspection control on anything but
> extremely high yielding boards unless there is very high functional
> test coverage to ensure that we don't let bad product out of our
> facility.
>
> I am just wondering what the rest of the industry has adopted as a
> policy for this problem.
>
> Thanks in advance.
>
> Phil
>
> Phillip A. Bavaro
> QUALCO/\/\/\/\  Incorporated
> Manufacturing Engineer, Staff
> [log in to unmask]
> Cell (619) 602-8644 (offsite, after hours)
> Pager (619) 271-3640
> Tel (619) 658-2542 Office/voice mail
> Cell (619) 845-9968 (workday)
> Fax (619) 658-1584
>
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