--0__=85256A50004C390F8f9e8a93df938690918c85256A50004C390F Content-type: text/plain; charset=us-ascii Your boards should be delivered functional, which means no bridges. With any machine squeegeed (?), placed, and reflowed parts there is a possibilty of error that a visual inspection might detect. A functional or flying probe test (Genrad) could be used to spot problems, but this is usually cost effective on high volume, or very high priced boards. For 100 pieces, a visual should shake this out. What you get, however, ultimately depends on the service you paid for. Could be you got a good price because the house stated that they would simply run them and ship. Scott F. Touchton 1550 Engineering Manager JDS Uniphase Wynn Rostek cc: (bcc: Scott Touchton/US/UNIPHASE) Subject: Re: [EE]: Solder bridging on low volume PCBs acceptable? 05/18/01 08:42 AM Please respond to pic microcontroll er discussion list I expect well under 1 percent. Wynn Rostek ----- Original Message ----- From: "Scott Newell" To: Sent: Friday, May 18, 2001 1:14 AM Subject: [EE]: Solder bridging on low volume PCBs acceptable? > What percentage of fine pitch surface mount boards should be expected to > return from the assembly house with solder bridges? > > At my day job, we've taken a couple of new designs into low-volume (100 > boards at a whack) production. This is the first use of surface mount > technology at this company. > > The current design I'm working on has three fine pitch parts: a TQFP-144, a > 48 pin TSOP-II, and a 28 pin SSOP. Eight of the 100 (supposedly machine > built) boards arrived today, and four had visible solder bridges, some > covering more than 2 pins. All bridges were confirmed to be hard shorts > with a meter. > > Is it considered acceptable industry practice to make the buyer do a > detailed physical examination? These designs don't have provision for > boundary scan or self test, but all I needed was a unaided visual scan and > a meter to find all the shorts. I can easily fix the boards with a little > solder wick, but it seems like I shouldn't have to. (Considering the time > constaints and backorder status, we'll probably have to do our own repair > work in the short term, but I'm getting to where I just want to reject the > shipments outright.) > > Comments? > > > thanks, > newell > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. 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