Ron: We have two issues with flux residues on our mixed tech boards. 1 Poor probing 2 Corrosion on probes that prevent electrical connection between the probe and the outer barrel of the probe assembly [the part that is wire wrapped and connected to the GenRad bus] Our test machine operators: • Think flux residues are a pain in the gluteus maximus. • Change probes [from a collection of different tip types: crown, straight point, diamond] to hopefully select [tailor] the correct probe for the probe location. [Documenting probe changes is a ... ] • Dry scrub probe tips with a wire brush [a little like Techni-Tool 872M1034, but with longer rows of bristles] when a fixture begins to act-up. • Inspect the probe side surfaces for corrosion [corrosion turns probe shafts black][from the flux???] that prevents good contact. [Operators seem to change probes haphazardly. The probe manufacturer recommends a change-out schedule ... 50k hits or something like that.] Sounds like constant maintenance, maintenance, maintenance ... ooooo babeeee, if maintenance wasn't tough enough to start with ... I wonder if the cost analysts figured this in when we changed over to NC? Yes, some fluxes probe better than others. Dave Fish "Hollandsworth, Ron" wrote: > Hello TechNet: > I have another question??? > > In the No-clean/Low-residue world, could you respond to this another > question? > > 1. After processing your boards with a No-clean/Low-residue paste or > flux, and do not clean them, do you have problems at your incircuit test > with flux build up on pogo pins? > > 2. If you have problems with your pogo pins, do you > > A. Clean the pogo pins and re-use them? > B. Replace the pogo pins? > C. Have found a formula/recipe/profile to process the boards w/o doing > A or B/ > > 3. Do you do Incircuit Testing immediately after SMD reflow or are > there other operations such as for mixed technology, say wavesolder, or post > wave assembly, etc., before your incircuit test? > > 4. I guess the question here is do you even do Incircuit test? > > All inputs are most certainly appreciated. > > Thanks > Ron Hollandsworth > > ************************************ > If this email is not intended for you, or you are not responsible for the > delivery of this message to the addressee, please note that this message may > contain ITT Privileged/Proprietary Information. In such a case, you may not > copy or deliver this message to anyone. You should destroy this message and > kindly notify the sender by reply email. Information contained in this > message that does not relate to the business of ITT is neither endorsed by > nor attributable to ITT. > ************************************ > > --------------------------------------------------------------------------------- > 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 > 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 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 ---------------------------------------------------------------------------------