I do not know just how clean I need, but pretty dern clean. But, it gets potted in silicone, so I just need a way to get it "clean enough" just before potting.
----- Original Message ----- To: "Multiple recipients of list CHIPDIR-L" <[EMAIL PROTECTED]> Sent: Friday, February 28, 2003 11:54 AM > I suspect you do not truly need ultra clean boards. If you do, you are > embarking on a long and difficult road. There are testers to measure board > cleanliness. I suggest you get one and determine your working requirements. > > Zero ion, ultra clean requires a clean room type assembly. Very difficult to > do. I had a zero ion requirement. The PCBs had large clear out areas around > the critical components. My biggest problem was both the PCB fab vendor and the > assembly vendor insisted on placing dirty test stamps in the clear out areas in > violation of the board specifications. The combination of a carbon based ink in > a solvent that penetrated the gel coat caused a 100% defect rate. Numerous lots > returned to vendor finally convinced them to read the specification before they > made the product. It took four months to get my first lot of ultra clean boards. > > Fred Townsend > > "Syd Levine (AnaLog)" wrote: > > > I am working on a high voltage shunt regulator design where contamination on > > the circuit board is causing problems. What is the best way to scrub or > > rinse all or most of the ionic contamination off a circuit board? I usually > > use denatured alcohol to remove flux residue, but that is not good enough in > > this case. Any suggestions or wisdom would be much appreciated. > > > > Here is a link to the Data Sheet on the little project: > > www.logwell.com/products/Codatron.PDF > > > > Syd H. Levine > > AnaLog Services, Inc. > > Phone: 270-276-5671 > > Telefax: 270-276-5588 > > E-mail: [EMAIL PROTECTED] > > URL: www.logwell.com > > > > -- > > Author: Syd Levine \(AnaLog\) > > INET: [EMAIL PROTECTED] > > > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > > San Diego, California -- Mailing list and web hosting services > > --------------------------------------------------------------------- > > To REMOVE yourself from this mailing list, send an E-Mail message > > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > > the message BODY, include a line containing: UNSUB CHIPDIR-L > > (or the name of mailing list you want to be removed from). You may > > also send the HELP command for other information (like subscribing). > > > -- > Author: Fred Townsend > INET: [EMAIL PROTECTED] > > Fat City Network Services -- 858-538-5051 http://www.fatcity.com > San Diego, California -- Mailing list and web hosting services > --------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in > the message BODY, include a line containing: UNSUB CHIPDIR-L > (or the name of mailing list you want to be removed from). You may > also send the HELP command for other information (like subscribing). > -- Author: Syd Levine \(AnaLog\) INET: [EMAIL PROTECTED] Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
