Electronics Forum: iron (Page 22 of 71)

Lead-Free SMD repair

Electronics Forum | Sat Apr 30 13:56:31 EDT 2005 | steve

My experience with different size boards and pre-heaters. The perfect world (right?) you would saturate the complete pcb with bottom pre-heat. But it is difficult with repair and rework equipment, not to mention the expense and foot print of large pr

SIR Testing

Electronics Forum | Tue Jul 04 08:04:37 EDT 2006 | davef

The heat from a soldering iron will push raw flux across the surface of the board and into surprising places. It's bad practice to squirt liquid low residue flux on the board during rework, because the portion of the flux that does not get heated pr

PCB Blistering / Delamination

Electronics Forum | Tue Jul 18 18:53:23 EDT 2006 | Mike F

Is it showing up after wave or reflow soldering, or after hand soldering? If the delamination or blister bridges between traces you have the potential for a short circuit between those traces. A delamination might be repairable, but in most cases i

solder void in oscillator joint

Electronics Forum | Tue Sep 04 10:27:33 EDT 2007 | rgduval

I haven't experienced this problem, exactly, but I have had issues with noise in digital circuits that appear to have gone away with touch up. The problem was that the customer blamed the noise issue on the solder quality, and he pointed to the fact

SN100C Selective Solder Voiding

Electronics Forum | Tue Nov 11 19:41:06 EST 2008 | gregoryyork

Thats the problem residual residue from HASL fluxes Lead free especially are worse.Very hygroscopic and out gass and produce dewetting as well over wave soldered boards especially. Leave iron on blown joint and will after several seconds fizz and pop

Multiple Resistor Rework

Electronics Forum | Mon Aug 30 11:09:13 EDT 2010 | davef

Lots of small parts, lots of hand soldering, lots of tired eyes inspecting on lots of boards: yields lots of room for error. How about this: * Part removal ** Cut each resistor between the pads using dykes ** Using a soldering iron [or hot air pen],

HMP hand soldering.

Electronics Forum | Tue Sep 11 21:24:00 EDT 2012 | vergara1

I'm also looking for tips for SMT hand soldering > with Sn05Pb93.5Ag1.5. Our technician is quite > good with standard SMT hand soldering, but hasn't > worked with HMP solder. > > Some specific > questions: > > - If the iron tip is hot enough >

Soldering Specification Needed

Electronics Forum | Mon Sep 26 12:58:33 EDT 2011 | action_101

So you are saying that building to class III is going to prevent failures? I disagree. Class III is trying to hit target condition in every aspect of the production of the circuit board. That my friend does not ensure failures from happening. I see

Re: Desperately looking for help

Electronics Forum | Wed Dec 13 11:24:08 EST 2000 | Wolfgang Busko

Hi George, bad luck! That�s why we professionals get so much money for it. Those "thingies" are mainly capacitors or resistors. If a capacitor is missing you might with luck not even notice it. A resistor, that�s different, you will notice it, what

Re: Desperately looking for help

Electronics Forum | Wed Dec 13 11:24:10 EST 2000 | Wolfgang Busko

Hi George, bad luck! That�s why we professionals get so much money for it. Those "thingies" are mainly capacitors or resistors. If a capacitor is missing you might with luck not even notice it. A resistor, that�s different, you will notice it, what


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