look like exposure problem or masking process issue (light leakage or the dust on the mask. depend upon what is the resist). Not rare. (at least I have seen it before - if it is low volume parts, QA should be more careful... due to high mix, change mask very often, you do have miss here and there - opposite what class III guys usually expect). my 1.6 cents. jk > It is very rare. Have you tried to poke it with an exacto to make sure it > isn't just stuck to the top as debris ? > If it is adhered to the part It is indicative of poor cleaning practices > which should cause some concern... > > It appears to be on the surface so removing it and touching up any damaged > Soldermask or surface finish appears as though it would not adversely > affect form, fit or function. > > James Hofer > General Manager > Accurate Circuit Engineering (ACE) > 3019 S. Kilson Dr. > Santa Ana CA 92707-4202 > [log in to unmask] > (714) 546-2162 wk > (714) 473-6127 cell > AS9100C / ITAR > ISO9001 > MIL-PRF-31032 and 55110 > Follow us on Facebook! > > > > -----Original Message----- > From: Watson, Howard August [mailto:[log in to unmask]] > Sent: Thursday, June 04, 2015 10:04 AM > To: TechNet E-Mail Forum; James > Subject: RE: [TN] PCB blob defect > > James, > > Yes, I concur. Not knowing anything about that process, is this something > that would be extremely rare? > > Howard A. Watson > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of James > Sent: Thursday, June 04, 2015 9:34 AM > To: [log in to unmask] > Subject: Re: [TN] PCB blob defect > > That is a blob of resist on the surface > > James Hofer > General Manager > Accurate Circuit Engineering (ACE) > 3019 S. Kilson Dr. > Santa Ana CA 92707-4202 > [log in to unmask] > (714) 546-2162 wk > (714) 473-6127 cell > AS9100C / ITAR > ISO9001 > MIL-PRF-31032 and 55110 > Follow us on Facebook! > > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Vladimir Igoshev > Sent: Tuesday, June 02, 2015 4:10 PM > To: [log in to unmask] > Subject: Re: [TN] PCB blob defect > > It's definitely done thing on top of the board. To be more certain, > we'd need the board for analysis. > > Regards, > > Vladimir > > Sent from my BlackBerry 10 smartphone on the Rogers network. > Original Message > From: Watson, Howard August > Sent: Tuesday, June 2, 2015 18:56 > To: [log in to unmask] > Reply To: TechNet E-Mail Forum > Subject: [TN] PCB blob defect > > Hi all, > > My PCB fab knowledge is limited, and a very unusual defect was discovered > (too late) in assembly. I'm wondering if anyone has seen something like > this before, or has an idea what this could be. The blue color seems > noteworthy to me. This is for IPC class III, space. I will return this to > the fabricator, but I wanted to get educated in case there is a debate > regarding the cause. Thanks for your help! > > Steve put the pictures here: > > http://stevezeva.homestead.com/Howards_Blob.jpg > > http://stevezeva.homestead.com/Howards_Blob_close.jpg > Howard A. Watson > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________