OT: Demagnetize Soldering Tip?

[Martin-85]

Hello elecrafters,

recently I worked on my hifi-speakers, I had to replace the
bass-speaker. I somehow must have magnetized the soldering tip,
it will not stop heating. In fact, it becomes glowing red!
What can I do to demagnetize it? Do I have to replace the tip?

It is a Weller WTCP-S, it has a magnetic tip to control
heat.



--
Best regards,
 Martin
K2 #2706                          mailto:[hidden email]


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[G3VVT]

Hi Martin,
 
The Weller TCP soldering iron uses a magnetically operated switch in the  
centre of the soldering iron. The soldering iron tip has a cap on the inner edge  
of specific magnetic attraction properties that is neutralised by what I  
believe is called the "Curie point effect" when this cap reaches a critical  
temperature. This releases the switch actuator and cutting off the 24V feed  to
the soldering iron heater.
 
You may have to replace the TCP switch assembly, though it would  seem that a
permanently magnetised tip may be the cause. Try another  soldering iron tip
first as the actuator switch assembly is rather more  difficult to replace. If
the tip is the cause it may be possible to demagnetise  it with a TV picture
tube degaussing wand.
 
A message to all to keep the TCP iron away from speaker magnets,  
particularly the Hi-Fi kind.
 
Bob, G3VVT
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