Electronics Forum: pass (Page 87 of 142)

BGA Rework

Electronics Forum | Mon Apr 28 04:02:39 EDT 2003 | chrissieneale

Hey, i'm back from the holiday. Progress on this board is quite good actually, althought the guy who i got to take off and replace all the bga's won't even look me in the eye!! He said he had a really tough job re-doing all the paste. 22 BGA's in a

Flux residue?

Electronics Forum | Wed Apr 30 14:35:35 EDT 2003 | clarkk

Hello all, We have received reports from two customers about electrical leakage on pcb assemblies that used Kester paste #HM531 (63/37) and washed with Kester 'Bio-kleen' saponifier and DI water. The leakage is such that when the boards receive power

Coatings to prevent water ingress

Electronics Forum | Tue Jun 03 13:01:16 EDT 2003 | Ramanandkini

We have some experience in manual application of conformal coating using a brush that too for small circuits espceially on the soldered pads. We use Chase corporation's Humuseal 2A64. This passes high humidity tests. I am also in touch with Lackwere

Wave soldering profiling

Electronics Forum | Fri May 07 17:38:00 EDT 2004 | bruce @ knoll

I will try that next. I did speed up the wave pump motor with a larger pully(20% more speed) This was done at the time to try to increase the size of the wave because I had component leeds touching the wave pot as they passed by. Due to the wave high

Optimal Speed for Universal Chip Shooters

Electronics Forum | Tue Sep 16 09:02:16 EDT 2003 | Graeme

Murtuza You have recieved loads of good info mainly all the preventive maintenance to be done. But can I ask was all of components placed twisted or just some when machine was run at full tact time 0.12s, I ask this as I run a 4791 and if its only so

Printing On Aluminum

Electronics Forum | Wed Aug 20 18:07:13 EDT 2003 | davef

If you desire fairly uniform paste deposits, consider dispensing your solder paste. Neither a screen, nor a stencil will conform to the rough surface commonly seen in cast aluminum blocks, as you mention. Just out of curiosity: * What flux type and

Soldermask thickness

Electronics Forum | Mon Oct 06 12:37:18 EDT 2003 | ramanandkini

It was a nice discussion. What I did here was a thermal shock test 1 hour@ +90 deg.c and immediately 1 hour @ -40 deg.c. The second test I did was a high humudity test for a week. After each test, I carried out a peel test with scotch tape. Those bo


Electronics Forum | Tue Nov 04 19:34:27 EST 2003 | gregoryyork

Blimey that's a problem and a half. Water Solubles will look completely different residue wise than No Cleans, pending age and solids contents No Cleans will go white powdery - watersolubles will stay oily Alternatively process reworked PCB's through

Outgoing QC Measurements for Board Operations

Electronics Forum | Tue Oct 21 10:24:54 EDT 2003 | russ

Whoever established the PPM rates should tell you what it is covering (solder joints/assemblies) PPM is nothing more than a ratio. Determining quality levels is really up to you/company and how you want to measure your quality. This can be anything

World Class First Time Yield

Electronics Forum | Sat Dec 27 01:32:42 EST 2003 | Ian Chan

IMHO, depending on whether its a regular run model, or a properly designed/setup pilot run model, getting a mean 75%-95% First Pass Yield (FPY%) is possible as a benchmark target. This is derived from your manufacturing history capabilities, and requ

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