Totally agree Bob. We only hand-assemble through-hole. Don't do our own prototypes. For limited SMT repair/rework we use water-washable and go through the same process. Never have tried to remove a BGA myself - I let the CM do that. Fortunately (knock on wood) we have had very few failures in SMT assemblies so haven't had to do much rework/repair. The only part we've had to remove/replace is the Analog Devices AD208 (RS-232 interface) as even with transorb zener protection, occasionally a customer smokes one of them. We're in the electric utility industry and sometimes lightning can take out a unit and it's always the interface that fails. Happens when the customer doesn't do the grounding correctly. Bob Landman H&L Instruments, LLC On Sep 8, 2010, at 3:32 PM, Robert Kondner wrote: > Bob, > > Try a "Water Pick" from a drug store, I got one at Walmart. I use it after > rework of a small part, it really blasts water under parts. I fill the > container with hot water and blast under small SMT parts. For complete board > wash I use a spray assembly like found on a kitchen sink. > > This is ok for protos but a real washing system would be suggested for > production. It takes a long, good, hot spray to get under BGAs. For QFNs > forget it, you can not clean under those parts. Cleaning solutions are a big > help. > > Also: > > I did not see any comments on my analyses of using tap water. Even with > 500mg / L dissolved solids tap water it takes a good number of small drops > to push towards the 10ug/insq limit. A 1mm drop (1/2 sphere) per 1 inch sq > is only .25 ug/insq. It would take 40 drops per inch square and THAT is a > lot of tap water. A quick blow off with an air gun leaves much less. > > Bob Kondner > > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Bob Landman > Sent: Wednesday, September 08, 2010 5:18 PM > To: [log in to unmask] > Subject: Re: [TN] Hand Soldering > > We switched to water-soluble Kester brand and are very satisfied with it. > Hot water and a good brush (we use a dish washing brush). > > Bob Landman > H&L Instruments. LLC > > On Sep 6, 2010, at 6:30 AM, Kenneth Wood wrote: > >> Hi all. >> What is the best setup for hand soldering as far as solder / cleaner? >> Rosin core? Water soluble? No-Clean? >> What cleaner too? >> >> I've been using rosin core with various cleaners but I have a hard time > with >> the white residue the cleaners leave. >> >> Thanks >> Ken >> >> >> >> >> >> ______________________________________________________________________ >> This email has been scanned by the MessageLabs Email Security System. >> For more information please contact helpdesk at x2960 or [log in to unmask] >> ______________________________________________________________________ >> >> --------------------------------------------------- >> Technet Mail List provided as a service by IPC using LISTSERV 15.0 >> 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 or (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) >> To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest >> Search the archives of previous posts at: http://listserv.ipc.org/archives >> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 > for additional information, or contact Keach Sasamori at [log in to unmask] or > 847-615-7100 ext.2815 >> ----------------------------------------------------- >> > > > ______________________________________________________________________ > This email has been scanned by the MessageLabs Email Security System. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 15.0 > 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 or (re-start) delivery of Technet send e-mail to > [log in to unmask]: SET Technet NOMAIL or (MAIL) > To receive ONE mailing per day of all the posts: send e-mail to > [log in to unmask]: SET Technet Digest > Search the archives of previous posts at: http://listserv.ipc.org/archives > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 > for additional information, or contact Keach Sasamori at [log in to unmask] or > 847-615-7100 ext.2815 > ----------------------------------------------------- > > ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. 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