----- 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 ---------------------------------------------------------------------------------