Electronics Forum | Wed Jun 02 15:29:47 EDT 2004 | pr
Make sure the board is stopping at the center of the worknest or you will waste lots of time (you'll get software limit errors when you try to find fids.). If it's not in the center, you need to go in and reteach from scratch (doesn't take too long).
Electronics Forum | Thu Jun 17 10:57:41 EDT 2004 | RicardoF
Believe me, I don't see any problem about optimization on Placement equipment nor printing or even the oven, my concerns are with the people: - Am I on the limit to assemble about 1100 to 1200 boards per shift (8 hours)? I have seen some of our lines
Electronics Forum | Sat Jun 12 00:34:00 EDT 2004 | kanwal324
Hi ! The main problem being faced currently is formation of solder balls - to be precise, these are micro solder beads generally found attached with bodies of SOTs, Chip Caps, Chip Resistors, between pins of SOICs (50 mil) - lying on PCB surface,
Electronics Forum | Mon Jun 14 14:39:12 EDT 2004 | davef
HASL Thickness: * HADCO DFM manual specifies a nominal thickness of 50-1500uin with an option for 100-1000uin * Merix DFM manual specifies 30-200uin IPC-6012, Class 1, 2, 3 do not spec a HASL thickness at all but only require that full coverage is m
Electronics Forum | Wed Jun 16 16:04:42 EDT 2004 | hulbert
An issue just came up concerning the color of FR-4. By accident we received a prototype board that was blue. We like the looks of it but can not justify a change because it looks cool. My questions are: 1: Why are most common PCB's green? 2: What are
Electronics Forum | Thu Jun 17 06:39:41 EDT 2004 | davef
Q1: Why are most common PCB's green? A1: Tradition Q2: What are the tradeoffs, ie electrical characteristics, etc for changing board colors? Q2: None. We use different colored solder mask on boards to indicate different development stages. See you
Electronics Forum | Tue Jun 22 22:26:12 EDT 2004 | pdeuel
we keep some extra chain belt that is used in most washers and reflow ovens. We have not had any problems. Our wash has slightly more pressure comming from the top nozzles than the bottom nozzles. same for the air. This will hold the boards down in t
Electronics Forum | Mon Jun 21 07:48:23 EDT 2004 | BobL
Contact Jim Marquis at Kimchuk, Inc. (203) 790-7800. They are marketing a rack and stack product that allows you to store the pc boards flat. It is esd safe and eliminates damage from handling boards. I have been in electronic manufacturing for 20 ye
Electronics Forum | Fri Jun 25 18:57:21 EDT 2004 | Pete
One word of caution, depending on the complexity of the boards and package, the Xray on Jewel Box may not be powerful enough to show the voiding defects within the solder sphere. We ran a board side by side against a high end system and find that out
Electronics Forum | Tue Jul 06 10:46:12 EDT 2004 | blnorman
We have now switched to Kester EP256. During our solder paste evaluation, resistance to humidity was one of the selection criteria. We printed multiple boards, then exposed them to 85�F/65% RH. At 30 minutes, 1 hour, 2 hours, and 4 hours exposure
