yes , I have seen this . We had power to ground caps and since they all connect to the same ground, telling which one was shorted was tough. Teradyne made a tester that would measure the most slightest change in resistance and you could hone in within a inch or so of the short with it. We ended up solder pasting and reflowing them on, then masking them over the wave with a pallet ( call me if you are interested in this). The tester is expenisve but if it happens more than 2-3 times a year it is worth it. Jim Gleason 972-494-1911 -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Stephen R. Gregory Sent: Tuesday, April 10, 2001 12:12 PM To: [log in to unmask] Subject: [TN] Caps shorting on bottomside after wave... Hi all! This is a weird one for me. We've got some boards that have 1210 .1uf capacitors epoxied on the bottom and are waved. Test is now telling me that there are capacitors shorted on the bottom...they can't tell me which one (or ones) because they are all in parallel in the circuit, and they can't tell which one it is. So what test does is give the boards back to the operators and have them take all the caps off (over 100) and hand solder them back on the boards...then the board will pass test. I stencil the glue down (I use loctite 368), the glue apertures in the stencil more or less creates a dam of glue bewteen each pad. See the picture at: http://www.xdrive.com/share/986929035134m7P20WC5Rnno6fT1pb7n I don't see how in the world a cap would short given the way the glue is printed. I have not been able to physically see a short, nor has one been shown to me. Test is just telling me there is a short, and when all the caps get removed and then resoldered back down the board works... Has anybody else ever had this weird problem? This just started here recently... Thanks! -Steve Gregory- ---------------------------------------------------------------------------- ----- 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 the following message: SET Technet NOMAIL 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 the following message: SET Technet NOMAIL 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 ---------------------------------------------------------------------------------