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Desoldering/ component removal
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Julian Barnes
Feb 26, 2016, 2:11:38 PM2/26/16
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hey guys,
I need to remove a sub-miniature audio transformer from a PCB. It should
be a piece of cake and always has been in the past, but something's
different about this one. At those odd times previously when I've done
this, I've just used a soldering iron and a vacuum pump to melt the
joints and suck off the solder. The pins are then free and the part
almost drops off by itself.
This one is not so simple, though. It's a double-layer board and the
transformer is mounted directly on top of the traces that feed it. On the
reverse side, I can see the end of the transformer's leads poking through
just proud of where a pad would normally be, but in this case, there are
no pads 'cos there are no traces; just tiny, isolated circles of solder
around each lead-end. I guess I need to get at the actual solder joints
proper on the top side, but the transformer is sat right on top of them
making it totally impossible to even see the joints I need to get at! Whut
gives here? Are these things deliberately designed to be unserviceable
nowadays? Is that the idea? Bastard manufacturers want us to buy new
stuff instead of fixing old?
Sigh. Does anyone know a ruse to defeat this darstardly scam?
I need to remove a sub-miniature audio transformer from a PCB. It should
be a piece of cake and always has been in the past, but something's
different about this one. At those odd times previously when I've done
this, I've just used a soldering iron and a vacuum pump to melt the
joints and suck off the solder. The pins are then free and the part
almost drops off by itself.
This one is not so simple, though. It's a double-layer board and the
transformer is mounted directly on top of the traces that feed it. On the
reverse side, I can see the end of the transformer's leads poking through
just proud of where a pad would normally be, but in this case, there are
no pads 'cos there are no traces; just tiny, isolated circles of solder
around each lead-end. I guess I need to get at the actual solder joints
proper on the top side, but the transformer is sat right on top of them
making it totally impossible to even see the joints I need to get at! Whut
gives here? Are these things deliberately designed to be unserviceable
nowadays? Is that the idea? Bastard manufacturers want us to buy new
stuff instead of fixing old?
Sigh. Does anyone know a ruse to defeat this darstardly scam?
tom
Feb 26, 2016, 2:27:37 PM2/26/16
to
"Julian Barnes" <jb9...@notformail.com> wrote in message
news:naq7rg$3c4$1...@dont-email.me...
This one works nice:
http://www.ebay.com/itm/281501377815?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
Consider adding ChipQuick to lower the melting point.
http://www.ebay.com/itm/CyberDoc-CHIP-Quik-Quick-DESOLDERING-REMOVAL-ALLOY-2ft-FOUR-4x-6-5-inch-STICKS-/141758972378?hash=item21017e41da:g:XGcAAOSwPgxVLEkM
And flux.
N_Cook
Feb 26, 2016, 2:28:55 PM2/26/16
to
Cursitor Doom
Feb 26, 2016, 5:04:03 PM2/26/16
to
On Fri, 26 Feb 2016 19:08:33 +0000, Julian Barnes wrote:
> Are these things deliberately designed
> to be unserviceable nowadays?
Probably.
> Are these things deliberately designed
> to be unserviceable nowadays?
> Is that the idea? Bastard manufacturers
> want us to buy new stuff instead of fixing old?
> Sigh. Does anyone know a ruse to defeat this darstardly scam?
on how to deal with them:
https://www.youtube.com/watch?v=Z38WsZFmq8E
Rheilly Phoull
Feb 26, 2016, 6:22:29 PM2/26/16
to
N_Cook
Feb 27, 2016, 4:43:47 AM2/27/16
to
A small length of tungsten wire from a smashed 40W mains lamp, crimped
to thicker delivery wire. Varying current of a bench ps, find the
current for dull red heat of the tungsten. Drape the tungsten wire over
one of the pins , and a forcing blade/wedge in the gap while delivering
heat to that pin and repeat?
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