Electronics Forum: take (Page 272 of 468)

Stainless Steel in wash system

Electronics Forum | Thu Sep 13 13:34:55 EDT 2001 | bschreiber

Kevin, Hot DI water will leach ions form stainless steel over time � much like an acid effect on metal. If you have ever seen a Steam Age Chamber after about 6-months use, you will know what I mean. DI water is �hungry� for ions and it will take th

parts popping off during reflow

Electronics Forum | Fri Sep 28 09:30:07 EDT 2001 | kmorris

Just had a similar phenomenon 2 days ago. May relate to your issue --- or not. Like you, I did a once over looking for mechanical obstruction & couldn't find any. Ran a thermal profile on the offending PCB & all checked out. Looked in end of oven

Reflow Oven

Electronics Forum | Fri Oct 05 08:35:52 EDT 2001 | Hussman

Hey Steven, Achieving the proper profile like you described does require you to engineer proper conveyor speeds and zone temps. Most conveyorized ovens have the inside of the ovens divided into zones. Each zone has a top and bottom heater that can

bridging between 2 pads

Electronics Forum | Wed Nov 07 21:16:44 EST 2001 | davef

Consider using the following hierarchy of rules for pad design: 1. If you have a land pattern in a manufacturer�s data sheet, use it. 2. If the data sheet doesn't have a land pattern, but does have an RLP (registered land pattern) number or JEDEC n

Where's The Drill?

Electronics Forum | Fri Nov 16 14:10:01 EST 2001 | mparker

I have oftened wondered how this industry lets its workers get away from being responsible. The best way I know of is to have them buy their own tools. Just take a look at the trades - carpenters, plumbers, welders, sheet metal men, body repair, mech

Where's The Drill? ... or responsibility

Electronics Forum | Mon Dec 03 12:17:05 EST 2001 | mparker

DaveF- did you get your answer? By the way, did you ever find that misplaced drill or did you have a fine time at Wal-Mart, grumbling in the aisles whilst evaluating a new do-hickey replacement? I believe I have read from the responses that most agr

Voiding in uBGA's w/blind uvia's in pads

Electronics Forum | Sat Nov 24 22:15:16 EST 2001 | Glenn Robertson

Tony, I'm not sure if even baking will stop the voids if you have gaps in the plating. It probably doesn't take much moisture or even trapped air. I'm not speaking from a lot of direct experience here, so please run the tests and let us know wh

Non-wettig on chip cap.

Electronics Forum | Fri Dec 07 15:23:27 EST 2001 | davef

I'm with Brian. TIN COATED 0603 FAILURES Welcome to the lead-free generation. ;-) The Eurolanders are so blanking stupid, it just makes my head hurt. But then again, it doesn�t take much. OK, enough pontification. Your profile is setup incorrec

PCB Manufacturers Certificate of Conformance

Electronics Forum | Wed Jan 02 12:11:32 EST 2002 | mparker

Ian is correct in saying that the Cert.s and x-section should be forwarded to QA. It would be the responsibility of Incoming or Receiving Inspection to validate the materials. Your suppliers are offering proof that they comply to industry standards o

Contract Manufacturing in INDIA

Electronics Forum | Sat Aug 10 06:38:25 EDT 2002 | jojojameson

Dear Freinds, We are having 18000 sqfeet airconditioned space for pcb contract manufacturing.We had chipschooters,through hole machines & fine pitch placement machines with international standard.In addtion we had clean rooms & wire bond facilities.W


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