Hi Mark,
The fiducials on HASL boards can sometimes be a HASSLE (grin). The flatness
of the finish is definitely an issue, but probably more so is the contrast
between the fiducial and the surrounding circuit board. Are you leaving a
sufficient border around the fiducial that is clear of solder resist? There
is nothing worse than shiny HASL fiducial surrounded by nice shiny solder
resist!
I take it that the customer has tried adjusting the gain etc on their fid'
camera?

Justin

> -----Original Message-----
> From: Mark Hargreaves [SMTP:[log in to unmask]]
> Sent: 21 August 2001 04:57
> To:   [log in to unmask]
> Subject:      [TN] P&P can't locate fiducials
>
> Hi All,
> We've made boards for a customer for a few years.  They've  been very
> satisfied with HASL finish.  Last month they started rejecting approx 40%
> of
> boards received (3 lots) because their P&P camera couldn't locate the
> fiducials.  The coating looks typical to us (thickness & smoothness).
> Customer can't see any difference between good & bad boards until they're
> on
> the P&P machine.  They say they haven't changed equipment, processes or
> operators.  We say the same.  No HASL hassles from other customers in this
> time period.  We tried reworking by wicking solder from the fiducials.
> Customer rejected approx. 20% for the same reason.  They also say that
> boards from another vendor are working fine.
> Any comments/ ideas?
>
>
> Mark
>
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