Hello Bill:

I am of the view that you leave nothing to chance regarding the
manufacturing notes for printed circuits.
Depending on the vendor you choose,  the quality will be commensurate
with their level of engineering review.
I hold that for the customer to be satisfied with the result, they need
to invest in companies that have a system of
data review in place. It protects both parties.
It clearly did not happen in this case.
I would clearly question these issues on an initial review of the data.
IPC does not and should not come in to play at this level. It is basic
performance criteria to the one we serve...the customer.
Namely, do a DFM on ALL data supplied and ask questions BEOFRE build
when the customer supplies ambiguous data.

Charlie McMahon

Brooks,Bill wrote:

> The Print did not specify SMOBC. But it also didn't specify SOS
> (Soldermask over solder) either! The implication is that the order of
> the notes IMPLIES that we want soldermask after the solder coating
> process.  Don't all PCB vendors know that the solder under the
> soldermask will reflow, wrinkle and damage the soldermask in
> assembly?  If we have soldermask on a thru hole technology board....
> we are going to wave solder the board. Why would a vendor interpret
> the drawing in such a way as to compromise the performance of the
> board? I can't believe this is still happening in 2002. I thought we
> learned our lesson back in 1980.....the first time I ever saw anyone
> DO that...
>
>
>
>  Doesn't IPC have a spec that tells us not to do it that way?
>
>
>
> Bill Brooks
>
>     -----Original Message-----
>     From: Steve Gregory [mailto:[log in to unmask]]
>     Sent: Tuesday, October 22, 2002 11:44 AM
>     To: [log in to unmask]
>     Subject: Re: [TN] Solder UNDER Soldermask Accept/Reject Criteria?
>
>     Hi Bill!
>
>     Was that called out on the fab drawing? I've ran across a few
>     boards here that still call that out on the drawing, and TRY and
>     get that changed before the boards are fabbed...most of the time
>     I've been lucky, but there's been a few that slipped by me.
>
>     Bottomline, if it's called out on the drawing, you don't have much
>     recourse...
>
>     -Steve Gregory-
>
>
>>     Anyone aware of a spec that sets the accept/reject criteria for
>>     boards that
>>     come in with solder UNDER the soldermask? Is this actually done as a
>>     legitimate practice? WHY would a vendor make the boards this way?
>>     Shouldn't
>>     we be making all boards to be SMOBC when there is a soldermask?
>>
>>     Bill Brooks
>
>
>
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