Mail Archives: geda-user/2012/07/18/03:30:10
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I would like to add that water soluble flux can cause issues also. It
can be conductive. I have seen ~50K Ohms between pads on SMT devices due
to organic water soluble not being properly cleaned. This is a real
issue with small pitch LDOs or LDOs with power pads. This can affect the
set point of the adjustable LDO and cause un-desirable voltages.
Good luck,
Joe
On 07/16/2012 01:08 PM, Ed Simmons wrote:
> On 16/07/12 19:41, Rob Butts wrote:
>> Thanks Ed!
>>
>> That is exactly what is happening.
>>
>> On Mon, Jul 16, 2012 at 10:22 AM, Ed Simmons <ed AT estechnical DOT co DOT uk
>> <mailto:ed AT estechnical DOT co DOT uk>> wrote:
>>
>>
>> We had this issue when using the damp sponge to clean the iron.
>> Switching to a brass spiral cleaner helped keep the iron clean,
>> and when it gets really dull and refuses to re-tin, use something
>> like this:
>> http://uk.rs-online.com/web/p/soldering-iron-tips-accessories/0226287/
>> - this brings up a good-as-new shine on the bit.
>>
>> Hope that helps.
>>
>> Ed
>>
>>
>
> No worries - please make sure you've got good fume extraction - it's
> nasty!
>
> Are you using no-clean flux? It's really difficult to deal with since
> most no-clean flux contains a plasticiser to halt any reaction from
> the small remaining amount of possibly active flux after it's been
> through a soldering cycle. This gets all over the bit of the iron and
> quenching the heat out of the bit with a sponge only makes it stick on
> harder. Reworking reflowed boards is such a pain (not to mention ugly
> and obvious) we're switching to water soluble fluxes so that we can
> actually clean it at the end. Such are the trials of short-run
> electronics. :-|
>
> If it spits while you feed the solder into the joints, the iron is
> probably a bit too hot, but this is hard to avoid without preheating
> the whole PCB until it's really toasty. On multilayer boards with pins
> connected to the ground-plane this is almost essential in order to be
> able to solder at anywhere near the correct temperature.
--
Keen Support Services, LLC
http://keensupport.net
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I would like to add that water soluble flux can cause issues also.
It can be conductive. I have seen ~50K Ohms between pads on SMT
devices due to organic water soluble not being properly cleaned.
This is a real issue with small pitch LDOs or LDOs with power pads.
This can affect the set point of the adjustable LDO and cause
un-desirable voltages.<br>
<br>
Good luck,<br>
<br>
Joe<br>
<br>
<div class="moz-cite-prefix">On 07/16/2012 01:08 PM, Ed Simmons
wrote:<br>
</div>
<blockquote cite="mid:500474CA DOT 5020505 AT estechnical DOT co DOT uk"
type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
<div class="moz-cite-prefix">On 16/07/12 19:41, Rob Butts wrote:<br>
</div>
<blockquote
cite="mid:CALSZ9gp5eTrMGWsU4fXJLJvjBX=kcTwSLNZBFd=FAveZJS8qeg AT mail DOT gmail DOT com"
type="cite">
<div>Thanks Ed!</div>
<div> </div>
<div>That is exactly what is happening.<br>
<br>
</div>
<div class="gmail_quote">On Mon, Jul 16, 2012 at 10:22 AM, Ed
Simmons <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:ed AT estechnical DOT co DOT uk" target="_blank">ed AT estechnical DOT co DOT uk</a>></span>
wrote:<br>
<blockquote style="margin:0px 0px 0px
0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid"
class="gmail_quote">
<div class="HOEnZb">
<div class="h5"><br>
</div>
</div>
We had this issue when using the damp sponge to clean the
iron. Switching to a brass spiral cleaner helped keep the
iron clean, and when it gets really dull and refuses to
re-tin, use something like this: <a moz-do-not-send="true"
href="http://uk.rs-online.com/web/p/soldering-iron-tips-accessories/0226287/"
target="_blank">http://uk.rs-online.com/web/p/soldering-iron-tips-accessories/0226287/</a>
- this brings up a good-as-new shine on the bit.<br>
<br>
Hope that helps.<span class="HOEnZb"><font color="#888888"><br>
<br>
Ed<br>
<br>
</font></span></blockquote>
</div>
<br>
</blockquote>
<br>
No worries - please make sure you've got good fume extraction -
it's nasty!<br>
<br>
Are you using no-clean flux? It's really difficult to deal with
since most no-clean flux contains a plasticiser to halt any
reaction from the small remaining amount of possibly active flux
after it's been through a soldering cycle. This gets all over the
bit of the iron and quenching the heat out of the bit with a
sponge only makes it stick on harder. Reworking reflowed boards is
such a pain (not to mention ugly and obvious) we're switching to
water soluble fluxes so that we can actually clean it at the end.
Such are the trials of short-run electronics. :-|<br>
<br>
If it spits while you feed the solder into the joints, the iron is
probably a bit too hot, but this is hard to avoid without
preheating the whole PCB until it's really toasty. On multilayer
boards with pins connected to the ground-plane this is almost
essential in order to be able to solder at anywhere near the
correct temperature.<br>
</blockquote>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">--
Keen Support Services, LLC
<a class="moz-txt-link-freetext" href="http://keensupport.net">http://keensupport.net</a>
</pre>
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