Electronics Forum: after (Page 291 of 656)

Part of PCB silkscreen turns yellow brownish

Electronics Forum | Thu Aug 28 23:15:44 EDT 2014 | phyllishwl

Hi all, Our production reported that they found 3 panels out of 53 panels with strange phenomenon after reflow. 1/ Blister / Delamination of PCB panels, 2pcs blister/delamination under solder mask, 1pc under Gold plating at Gold finger 2/ Silkscr

opalxii

Electronics Forum | Fri Nov 14 10:56:12 EST 2014 | max83

We are working with SMT lines consisting of > machines opalxii after 5/6 years of operation > have appeared problems in operation of the > engines on the x and y axes. I disassembled the > engines from the machine and I removed the cap > that c

Quad 4C MK2, Z axis drift

Electronics Forum | Fri Mar 13 15:09:20 EDT 2015 | marcelorotofrance

Hello everybody Lately our machine has been working pretty well, but it can’t last too long. Now, during this week’s production cycle, it began to increase the component’s reject rate to alarming levels (obviously the operators reported me when the m

Re: Wavesoldering of PLCC44 package

Electronics Forum | Fri Feb 25 11:13:32 EST 2000 | Russ

This probably won't help much but I find it at least a little interesting. During some experimentation recently I accidently loaded a board into the wave upside down and it had a PLCC 68 package along with other types of components that had only bee

Re: Cure/Reflow Profile

Electronics Forum | Tue Feb 22 14:20:55 EST 2000 | Sal

Please let me rephrase the question. Running passive side first and curing the adhesive using a reflow profile derived for 63/37 solder paste. After curing the board is flipped around, pasted and reflowed. My concern is when curing the adhesive usin

Re: BGA PAd Soldermask

Electronics Forum | Mon Feb 21 11:22:21 EST 2000 | K. Ckak

Hi Kurt, I agree with Dave F. I had exact same problem with PBGA placement. We requested our PCB vendor to plug/tent via (button printing) after HASL with SR1000 which worked well in the long run. There are couple of failure modes associated wit

Re: Lead Contamination....Coplanarity???

Electronics Forum | Fri Feb 11 13:36:40 EST 2000 | Finepitch Services

Jeff, I guess my experience in such issues always took me back to the screen printing process and I only want to bring up that portion of the possible causes to this case. When we talk about coplanarity, the component lead coplanarity first comes t

I am looking for the s/w for smt process

Electronics Forum | Mon Jan 08 20:33:15 EST 2001 | Kyung Sam Park

Where can I find this kinds of S/W for SMT PROCESS. With defects collected for each smtline Analyze the cause of defect using D/B in smt process automatically(DB means cause of defects in smt process already prepared with for a long period ex

Clean before conformal coating?

Electronics Forum | Thu Jan 04 17:26:17 EST 2001 | Cory

We're going to begin conformal coating a few of our assemblies as required by our customer. We're using Kester No clean paste and will use cotton gloves to keep the boards clean while handling. My question is: Do we need to clean the boards prior to

Re: Component Identity Help!

Electronics Forum | Thu Jan 04 21:27:39 EST 2001 | John L.

Thanks for the reply Stevo...! I am looking at doing just that. I would really like to ID this component and repair this Pico board though... After several searches, I can't find any (3) element resistor or capacitor networks to match it. I'm hop


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