MessageI 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
    =20
    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.
    =20
    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.
    =20
    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.
    =20
    Hope I interpreted your question correctly and that this helps.
    =20
    Ron
    =20
      -----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,
      =20
      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.
      =20
      =20
      Thanks,
      =20
      Kareem








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 field,=20
but many days I spent at the bench fixing things I had =
replaced....On one=20
day I was real bored as the only stuff I had to do were a very common =
part=20
replacement...so I got out my solder gun and found a bottlecap and =
melted solder=20
into it...Then a notion came to mind.....Why not be creative? I put a =
silver=20
dime into the bottlecap and melted solder around it. And just then I had =
a=20
service call and went out...There were only two techs and nobody knew I =
was=20
goofing around...so I put the bottlecap in my toolbox.... the next day I =
picked=20
up the bottlecap to see what I had done....I took it out of the =
cap...and there=20
was no dime...so I figured the art test was a flop...so I heated the =
solder to=20
see what had happened....Guess what? NO DIME...the dime was like =
gone...only=20
solder left....so what in the heck happened...this happened in 1967.. =
Anyone got=20
a clue? I have never solved the problem, nor have been able to re-create =
the=20
thing...

  
----- Original Message ----- 
  From:=20
  Kareem 
  
To: psn-l@.............. 
  
Sent: Friday, February 08, 2002 =
6:15=20
  AM
  
Subject: RE: soldering pad =
tips...
  


  
Thanks Ron 
  
Your=20
  interpretation was adequate because it helped.
  

    

    
-----Original Message-----
From: psn-l-request@...............
=20
    [mailto:psn-l-request@webtron=
ics.com]=20
    On Behalf Of Ron Westfall
Sent: Thursday, February =
07, 2002=20
    11:14 PM
To: psn-l@..............
Subje=
ct:=20
    RE: soldering pad tips...


    
Hi=20
    Kareem
    
 
    
I=20
    am assuming that you are removing a component from the circuit=20
    board.  The circular or square pad surrounds a hole drilled =
through the=20
    circuit board.  The sides of the hole are plated with =
metal.  The=20
    component lead passes through the hole and solder fastens it to the =
pad on=20
    either side of the board and to the plating on the sides of the =
hole. =20
    The pad is actually copper underneath.  What you see on the =
surface is=20
    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 too=20
    long.  If this happens, you are in deep =
trouble.
    
 
    
If=20
    you are real careful, you can heat the component lead, and when the =
solder=20
    liquifies, gently pull the component lead out through the =
hole.  Remove=20
    the lead in stages rather than let the pad get too hot.  =
Alternatively,=20
    you can buy a device called a Soldevac that uses a brief burst of =
vacuum to=20
    suck molten solder out of the component lead hole.  If done =
right, its=20
    quick and you are left with a dry hole which the component will =
almost fall=20
    out of.
    
 
    
Hope I interpreted your question correctly and that this=20
    helps.
    
 
    
Ron
    
 
    

      
-----Original Message-----
From:=20
      psn-l-request@.............. =
[mailto:psn-l-request@...............On=20
      Behalf Of Kareem
Sent: Tuesday, February 05, 2002 =
1:41=20
      PM
To: PSN
Subject: soldering pad=20
      tips...


      
Hi=20
      all,
      
 
      
I'm preparing=20
      to unsolder a pad on a circuit board and I'm not exactly sure =
where=20
      unsolder. If anyone is familiar with electronic circuitry, please =
let me=20
      know. I seems that I just need to remove the solder from a =
particular pad=20
      - the only problem is that I'm not certain what the pad actually =
looks=20
      like. Any links or websites with pictures on how to unsolder this =
would be=20
      greatly appreciated.
      
 
      
 
      
Thanks,
      
 
      
Kareem
      =