PSN-L Email List Message
Subject: Re: soldering pad tips...
From: "Mark Robinson" mark.robinson@...............
Date: Sat, 9 Feb 2002 06:25:52 +1300
MessageWas that one of those really old dimes ... back when they were =
95% sikver ?
I suspect that it was still there, but had done a shape shifter trick.
Mark
New Zealand
ps: what's a dime ?
----- Original Message -----=20
From: bobshannon.org=20
To: psn-l@.................
Sent: Saturday, February 09, 2002 4:22 AM
Subject: Re: soldering pad tips...
I wonder if some solder genius can tell me what happened to me 30 =
years ago. I was an electronics tech for Seeburg Corp and usually worked =
in the field, but many days I spent at the bench fixing things I had =
replaced....On one day I was real bored as the only stuff I had to do =
were a very common part replacement...so I got out my solder gun and =
found a bottlecap and melted solder into it...Then a notion came to =
mind.....Why not be creative? I put a silver dime into the bottlecap and =
melted solder around it. And just then I had a service call and went =
out...There were only two techs and nobody knew I was goofing =
around...so I put the bottlecap in my toolbox.... the next day I picked =
up the bottlecap to see what I had done....I took it out of the =
cap...and there was no dime...so I figured the art test was a flop...so =
I heated the solder to see what had happened....Guess what? NO =
DIME...the dime was like gone...only solder left....so what in the heck =
happened...this happened in 1967.. Anyone got a clue? I have never =
solved the problem, nor have been able to re-create the thing...
----- Original Message -----=20
From: Kareem=20
To: psn-l@.................
Sent: Friday, February 08, 2002 6:15 AM
Subject: RE: soldering pad tips...
Thanks Ron=20
Your interpretation was adequate because it helped.
-----Original Message-----
From: psn-l-request@.............. =
[mailto:psn-l-request@............... On Behalf Of Ron Westfall
Sent: Thursday, February 07, 2002 11:14 PM
To: psn-l@..............
Subject: RE: soldering pad tips...
Hi Kareem
I am assuming that you are removing a component from the circuit =
board. The circular or square pad surrounds a hole drilled through the =
circuit board. The sides of the hole are plated with metal. The =
component lead passes through the hole and solder fastens it to the pad =
on either side of the board and to the plating on the sides of the hole. =
The pad is actually copper underneath. What you see on the surface is =
a solder coating on the copper.
The danger with unsoldering components is that the copper pad =
substrate may lift off the PCB board if the pad is heated too hot and/or =
too long. If this happens, you are in deep trouble.
If you are real careful, you can heat the component lead, and when =
the solder liquifies, gently pull the component lead out through the =
hole. Remove the lead in stages rather than let the pad get too hot. =
Alternatively, you can buy a device called a Soldevac that uses a brief =
burst of vacuum to suck molten solder out of the component lead hole. =
If done right, its quick and you are left with a dry hole which the =
component will almost fall out of.
Hope I interpreted your question correctly and that this helps.
Ron
-----Original Message-----
From: psn-l-request@.............. =
[mailto:psn-l-request@................. Behalf Of Kareem
Sent: Tuesday, February 05, 2002 1:41 PM
To: PSN
Subject: soldering pad tips...
Hi all,
I'm preparing to unsolder a pad on a circuit board and I'm not =
exactly sure where unsolder. If anyone is familiar with electronic =
circuitry, please let me know. I seems that I just need to remove the =
solder from a particular pad - the only problem is that I'm not certain =
what the pad actually looks like. Any links or websites with pictures on =
how to unsolder this would be greatly appreciated.
Thanks,
Kareem
Message
Was that one of those really =
old dimes ...=20
back when they were 95% sikver ?
I suspect that it was still =
there, but had=20
done a shape shifter trick.
Mark
New Zealand
ps: what's a dime =
?
----- Original Message -----
From:=20
bobshannon.org=20
Sent: Saturday, February 09, =
2002 4:22=20
AM
Subject: Re: soldering pad =
tips...
I wonder if some solder genius can tell me what happened to me 30 =
years=20
ago. I was an electronics tech for Seeburg Corp and usually worked in =
the=20
field, but many days I spent at the bench fixing things I had=20
replaced....On one day I was real bored as the only stuff I had to do =
were a=20
very common part replacement...so I got out my solder gun and found a=20
bottlecap and melted solder into it...Then a notion came to =
mind.....Why not=20
be creative? I put a silver dime into the bottlecap and melted solder =
around=20
it. And just then I had a service call and went out...There were only =
two=20
techs and nobody knew I was goofing around...so I put the bottlecap in =
my=20
toolbox.... the next day I picked up the bottlecap to see what I had =
done....I=20
took it out of the cap...and there was no dime...so I figured the art =
test was=20
a flop...so I heated the solder to see what had happened....Guess =
what? NO=20
DIME...the dime was like gone...only solder left....so what in the =
heck=20
happened...this happened in 1967.. Anyone got a clue? I have never =
solved the=20
problem, nor have been able to re-create the thing...
----- Original Message -----
From:=20
Kareem=20
Sent: Friday, February 08, =
2002 6:15=20
AM
Subject: RE: soldering pad=20
tips...
Thanks Ron
Your interpretation was adequate because it=20
helped.
Hi Kareem
I am assuming that you are removing a component from =
the=20
circuit board. The circular or square pad surrounds a hole =
drilled=20
through the circuit board. The sides of the hole are plated =
with=20
metal. The component lead passes through the hole and solder =
fastens=20
it to the pad on either side of the board and to the plating on =
the sides=20
of the hole. The pad is actually copper underneath. =
What you=20
see on the surface is a solder coating on the =
copper.
The danger with unsoldering components is that the copper =
pad=20
substrate may lift off the PCB board if the pad is heated too hot =
and/or=20
too long. If this happens, you are in deep=20
trouble.
If you are real careful, you can heat the component lead, =
and when=20
the solder liquifies, gently pull the component lead out through =
the=20
hole. Remove the lead in stages rather than let the pad get =
too=20
hot. Alternatively, you can buy a device called a Soldevac =
that uses=20
a brief burst of vacuum to suck molten solder out of the component =
lead=20
hole. If done right, its quick and you are left with a dry =
hole=20
which the component will almost fall out of.
Hope I interpreted your question correctly and that this=20
helps.
Ron
Hi=20
all,
I'm=20
preparing to unsolder a pad on a circuit board and I'm not =
exactly sure=20
where unsolder. If anyone is familiar with electronic circuitry, =
please=20
let me know. I seems that I just need to remove the solder from =
a=20
particular pad - the only problem is that I'm not certain what =
the pad=20
actually looks like. Any links or websites with pictures on how =
to=20
unsolder this would be greatly appreciated.
Thanks,
Kareem
=
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