----- Original Message ----- From: tony steinke <[log in to unmask]> To: <[log in to unmask]> Sent: Tuesday, February 26, 2002 11:19 AM Subject: Fw: [TN] The board looks funny... > > ----- Original Message ----- > From: tony steinke <[log in to unmask]> > To: <[log in to unmask]> > Sent: Tuesday, February 26, 2002 11:18 AM > Subject: Re: [TN] The board looks funny... > > > > Genny, > > Sounds like your board supplier is using various types of materials and > > processes if you are recieving boards from the same supplier. As you > > explained > > if your inner cores are lighter in color they probably used an oxide > > replacement > > or double treat copper which will not give you the "black oxide" or very > > dark > > coloration. If your traces on the outside appear darker they may have > > switched > > to an adhesion promoter for the soldermask, but usually you would not see > > this unless the board has ENIG, white tin, or other aggresive finish which > > do in fact > > attack the mask. > > Tony Steinke > > Process Engineer > > AIT-Atlanta Inc.(multi-wire lives on) > > [log in to unmask] > > ----- Original Message ----- > > From: Genny Gibbard <[log in to unmask]> > > To: <[log in to unmask]> > > Sent: Tuesday, February 26, 2002 6:59 AM > > Subject: [TN] The board looks funny... > > > > > > > Hi, > > > We just received a new rev of a PWB in house. It has not been populated > > > yet. It looks like it has been built correctly - the right layer order, > > > connections, etc - but it looks different than the rest of our 4 layer > > > boards. Normally the traces on the inner layer that is closest to the > > > surface appear dark in colour and the deeper layer appears lighter. > This > > > board is the opposite. The layer closest to the surface is light in > > colour > > > and the deeper layer is dark. Also, the FR4 seems much easier to see > > > through than usual. > > > > > > Any thoughts or explanations for this? > > > Thanks for your time. > > > > > > Genny Gibbard (mailto:[log in to unmask]) > > > > > > > -------------------------------------------------------------------------- > > ------- > > > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > > > To unsubscribe, send a message to [log in to unmask] with following text > in > > > the BODY (NOT the subject field): SIGNOFF Technet > > > To temporarily halt delivery of Technet send e-mail to [log in to unmask]: > > SET Technet NOMAIL > > > To receive ONE mailing per day of all the posts: send e-mail to > > [log in to unmask]: SET Technet Digest > > > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > > > E-mail Archives > > > Please visit IPC web site http://www.ipc.org/html/forum.htm for > additional > > > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > > ext.5315 > > > > -------------------------------------------------------------------------- > > ------- > > > > > --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------