Electronics Forum | Wed Jan 02 13:31:55 EST 2002 | PeteC
The rule-of-thumb is to follow the flux mfg.'s recommended profile to achieve their specified top side PCB temperature before making contact with the wave. Typical top side PCB temps are 100-120deg.C. Your wave contact time should be around 2 seconds
Electronics Forum | Mon Jan 28 07:40:40 EST 2002 | cnotebaert
Yes and Yes, Your solder supplier should recomend a profile (standard profile) in most cases you can follow it. Of course you should be running a thermal profile of each board type to verify it is within the specified temp rang. You should also chec
Electronics Forum | Fri Feb 22 11:49:42 EST 2002 | stimpman
Hi, Have you checked your placements pre-reflow? The most typical cause of a billboard unlike tombstoning is a pick and place issue. Billboarding will usually happen with ( profile/bad pad layout and the most common just poor center placement. I'v
Electronics Forum | Thu Feb 21 13:08:06 EST 2002 | vincent_f
Hello, I had recently a problem of crack between the solder ball (SnPb) and the Ni layer of the PCB pad. We use Electroless Ni/Au technology for PCB. This phenomena is amazing because the crack is very clean (straight) and it creates a space betwee
Electronics Forum | Thu Mar 07 19:19:41 EST 2002 | dason_c
Ron, you need to check all the thermal couples are in good shape and clean before ask the outside service to do the calibration. After the machine calibrated and I suggest that you run 2 profiles and all the heating zone set at the same temperture,
Electronics Forum | Mon Jul 07 00:33:12 EDT 2003 | praveen
First we have to look in to the current situiation of the SMT line.Is the pick and place machine very old and can not perform consistently. Is the board to be inspected is very dense and have lots of connectors and fine pitch comp.with lots of 0402 c
Electronics Forum | Mon Jul 07 21:08:17 EDT 2003 | sam
I have an experience about AOI that it is necessary in a complicated PCB. Due to the final circuit design, the concerned PCB were having nets on the boards, that the Open/Short could not be identified by traditional In-Circuit testers. Some long tr
Electronics Forum | Mon Mar 18 09:10:17 EST 2002 | davef
We use an internally developed database. Check Quality Magazine http://www.qualitymag.com for supplier conracts. We looked at: * novasoft 617.221.0300 * PQ systems 800.777.3020 (Workbench $1k) * Quality Management Products 888.255.1992 Mike Haines
Electronics Forum | Tue Mar 19 11:52:25 EST 2002 | davef
We have had Corfin recommended to us, but have never needed to use them. Also consider: * EMPF uses a ROSA process for solder rejuvenation. Check with Cal [at Manncorp, a SMTnet regular] for the scoop [chocolate, vanilla, or ROCKY ROCOCO] on EMPF.
Electronics Forum | Mon Apr 15 22:37:27 EDT 2002 | davef
Regarding your customer suditor, it would have been nice if you said something like ... Routinely, our testing shall be less than 1.56 microgram/cm^2 NaCl equivalent ionic or ionizable flux residue, according to TM-650, Method 2.3.35 'Detection And
