Thanks Ron 
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
 








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

  

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


  
Hi=20
  Kareem
  
 
  
I am=20
  assuming that you are removing a component from the circuit =
board. =20
  The circular or square pad surrounds a hole drilled through the =
circuit=20
  board.  The sides of the hole are plated with metal.  The =
component=20
  lead passes through the hole and solder fastens it to the pad on =
either side=20
  of the board and to the plating on the sides of the hole.  The =
pad is=20
  actually copper underneath.  What you see on the surface is a =
solder=20
  coating on the copper.
  
 
  
The=20
  danger with unsoldering components is that the copper pad substrate =
may lift=20
  off the PCB board if the pad is heated too hot and/or too long.  =
If this=20
  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=20
  I interpreted your question correctly and that this =
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 =

    PM
To: PSN
Subject: soldering pad=20
    tips...


    
Hi =

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