Electronics Forum | Wed Nov 01 12:10:20 EST 2000 | Jeff
charles, i can appreciate the hand held "reel to reel" scanner as a good solution that is very cost effective. during my smt supervision days we had a number of part loading checks. 1. load plan check, 2. scan check, 3. reel to reel manual check.
Electronics Forum | Sun Aug 06 14:02:04 EDT 2000 | David Harper
The company I work has been assembling this particular board for several years now, and one thing has always remained constant. Bad Soldering. The board is a double sided board, the solder side has about 250 1206 caps & resistors and Sot-23 transisto
Electronics Forum | Mon Aug 07 10:22:13 EDT 2000 | genglish
Ramon, I have had experience in the problems you are witnessing. The problem can relate to a number of factors. Obviously the printing process is the first place to start your investigations, try looking at the stencil apertures for bleed under the
Electronics Forum | Mon Aug 07 14:02:54 EDT 2000 | Brian W.
If you are satisfied with the apertures, then you need to check placement pressure, plant humidity, and the reflow profile. If the placement pressure is too great, it will separate minute portions of the solder from the pad. When the solder reflo
Electronics Forum | Mon Aug 07 04:25:00 EDT 2000 | dougie
Hi Guys, Thanks for the response. To answer your questions... The compoments we are placing and experiencing trouble with are generally 1206 components. It isn't just one manufacturer either. The one part though we have most problems with though is
Electronics Forum | Thu Jul 13 05:23:30 EDT 2000 | Donnie
There a few questions that I have for you. 1. What type of flux are you using? 2. What temps are your preheaters set at? 3. Can you possibly place them on after the wave? The reason I'm asking is that there may be some adjustments to the wave to bur
Electronics Forum | Wed Jun 14 08:08:56 EDT 2000 | Wolfgang Busko
Hi ji tae, we had a similar problem with QFPs 0,5 pitch processed by one subcontractor. The symptoms we noticed were: - the solderjointshape and wetting looked normal - the surface had a dull gray appearance - by pushing a lead sideways with a tweez
Electronics Forum | Fri Jun 02 17:19:56 EDT 2000 | Big K
I am currently experiencing several problems with QFP's on one of our IP3's. The first problem is with QFP240 devices. We are experiencing a high reject rate with these parts when using vision type 100. What appears to happen is that the vision syste
Electronics Forum | Mon Apr 17 19:44:20 EDT 2000 | Dave F
Ashok: Well, your customer probably has a good reason for wanting you to send them boards without holes in the solder mask. What is their goal for the mask capabilities after you get do reworking the boards? * Cosmetic surface coat? * Performance t
Electronics Forum | Thu Mar 01 10:46:11 EST 2001 | davef
Various lint free stencil wipe suppliers take various approaches to stencil cleaning. For instance ... Techspray Directions: Start with a dry TechClean Wipe (2358, 2361, or 2362) to remove excess solder pastes. Follow this with the 1608 Pre-Saturat
