Electronics Forum: after (Page 473 of 658)

PCB lamination issues

Electronics Forum | Mon Feb 12 11:12:16 EST 2007 | davef

Q1. After reflow some boards start producing bumps/bubbles which damage the internal layers causeing PCBs failed in Electrical-testing. How can I eradicate this problem from my assembling process? A1. Find a proper board supplier. Q2. If SMT compon

SMT on Flexible circuits

Electronics Forum | Fri Feb 16 06:47:38 EST 2007 | CL

vshan, We were using pallets (delmat with cavities for the flex) We put stips of double sided Kapton tape in the critical areas. The tape held up to the heat and kept the circuit flat for the QFP's and BGA's. We based our assembly process for this c

ImSn thickness

Electronics Forum | Mon Feb 19 17:34:02 EST 2007 | GS

Thank You Pavel and Dave, Unfortunately I do not have IPC-4554. Anyway I 0.6-1.0umm is what I remember, and confirmed by reading also through leterature available on google. I was just going to understand if it possible to obtain more thickness

Reflowing BGA's 2x on a double sided board

Electronics Forum | Thu Mar 01 12:08:33 EST 2007 | rob_thomas

It sounds like something is a little off here. ROHS compatible and ROHS capable parts are going to be ok with a leaded solder paste and processing unless you are building high reliability product.( some are going to argue that even high rel products

Clearance between Through hole and chip component

Electronics Forum | Wed Feb 28 00:01:47 EST 2007 | Muhammad Haris

Hi, The distance between the two terminations/endings/pads of 0603 (0201)is 0.15mm i.e. lesser than than the distance between the 0603 and through hole i.e. 0.5mm My ques is that, then why its termination doesnot short as it has a minimum distance.A

How long can you leave paste?

Electronics Forum | Thu Mar 15 07:04:59 EDT 2007 | chrissieneale

Hello Just wondering if anyone has done trials on how long you can leave paste (tin-lead or pb free) on a board after you have printed it before it starts going 'off'? Thanks Chrissie FYI - have searched and found the 'pasting ahead' thread - jus

Scratched Flex

Electronics Forum | Thu Mar 15 12:22:13 EDT 2007 | Steve

Hi All! There were a few rigid flex assemblies brought to me this morning with some scratches in the coverlay of the flex. They are pretty minor, but they do go down into some traces a bit. I don't think the traces are really signal traces, but are


Electronics Forum | Fri Mar 23 09:07:55 EDT 2007 | oldsmtdude

Proper care and calibration of feeders helps the most. Once repeatability of position is gone the machine's feeder offset will start to resemble the agility of a drunken sailor. That can manifest itself in vision errors or worse as placement problems

Pattern matching type fiducial at Topaz/ Emerald machines

Electronics Forum | Thu Mar 22 17:24:19 EDT 2007 | coop

Have you tried changing the algorithym type in mark info. to special 1 or 2 ? you will have to perform an F6 on this after you change it. If you were on Normal before then you will want to lower the threshold from the what you have it set at ,probabl

LGA36 6.5 x 3.5 mm

Electronics Forum | Sat Mar 24 03:06:55 EDT 2007 | aj

Hi Mika, We came across some difficulties with this type of device a couple of years back . After the proto run we needed to touch up the outside fillets to get stability and product to pass test. ( even though the manf. stated that there is no fill

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