Electronics Forum: marjk off pcb (Page 1 of 87)

pcb change

Electronics Forum | Wed Apr 20 10:09:20 EDT 2011 | accessguy

I have a simple battery powered led array pcb that is turned on and off via rf remote. I want to modify it so that it turns off after 90 seconds, and it flashes or blinks every second or so during those ninety seconds. Can anyone suggest a forum or w

pcb manufacturing

Electronics Forum | Mon Jul 31 01:24:28 EDT 2006 | fastek

If you ask me, these were the two issues that contributed the most to the decline in PCB Assembly Manufacturing in the US...for that matter the electronics industry in general. 1) The obsession of management to please shareholders which was driven f

Printing off contact

Electronics Forum | Fri Feb 09 16:11:31 EST 2007 | MAC

Not an expert on PCB manufacture, but it looks like mask from other side of PCB flowed through vias before this side was masked. Is it possible previous vendor masked this side first, or used film-type mask which would not flow through?

Squeege Snap off

Electronics Forum | Mon Jan 15 16:32:46 EST 2001 | Darby

Adrian, I'll go again. The term "snap off" on it's own refers to the distance between the bottom of the stencil and the top of the pcb. Sometimes referred to as "print gap". As you prefaced your question with "squeegee snap off" I thought you were as

Printing off contact

Electronics Forum | Wed Feb 07 06:37:39 EST 2007 | mk

We have been processing a family of boards for 3 years. No issues. New PCB Vendor and the boards suddenly will not print very well. Sloppy printing definition. Closer inspection reveals that the soldermask is built up .0012-.0019 over the vias, preve

Printing off contact

Electronics Forum | Wed Feb 07 17:19:36 EST 2007 | stepheniii

We have been processing a family of boards for 3 > years. No issues. New PCB Vendor and the boards > suddenly will not print very well. Sloppy > printing definition. Closer inspection reveals > that the soldermask is built up .0012-.0019 over >

BGA dropping off the board

Electronics Forum | Thu Feb 14 04:38:43 EST 2008 | marjorie

Anyone knows why BGA fell off sometimes from the board? I was running in a single sided only. I encountered a BGA falling off from the pcb pad. The pcb is ENIG and lead free process. The pads had no solder and didn't looks like having a black pad thr

BGA dropping off the board

Electronics Forum | Thu Feb 14 07:34:10 EST 2008 | jdumont

How many fell off out of your entire lot? What was the soldering quality like on the ones that didn't fall off (xray, visual)? You need to determine if its a random problem or if even the ones that stayed on are barely on and go from there. If the o

parts popping off during reflow

Electronics Forum | Thu Sep 27 21:19:56 EDT 2001 | stimpy

>> try a linear ramp to allow the entire pcb to heat up evenly. What is your conveyor speed?

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

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