In article ,
Bob Stephens wrote:

I've heard this sort of Iron referred to as a "Curie Point" Iron. Is this
the same thing?

Probably so. A material's Curie point (or temperature) is the
temperature at which, when heated, the material ceases to be able to
support/retain a magnetic field, and any existing magnetic field is
randomized.

Heating a permanent magnet above its Curie temperature demagnetizes it.

The slugs used in the Weller tips have Curie temperatures of 600, 700,
or 800 degrees F (plus or minus a bit, I imagine).

--
Dave Platt AE6EO
Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

The temperature is regulated via a rather elegant (I think)
implementation in the iron. At the base of each tip, there's a slug
of a ferromagnetic material. The properties of this slug are
controlled during manufacture, so that it will change from a magnetic
to a nonmagnetic state at a specific temperature (e.g. 700 F).

Inside the shaft of the iron there is a switch with a magnet on the
end. When the tip is below its transition temperature, the magnet is
attracted to the ferromagnetic slug on the back of the tip, the switch
is pulled forwards, the contacts close, and current flows through the
iron's heating coils. When the tip reaches its desired temperature
the ferromagnetic slug becomes non-magnetic, the magnet in the shaft
"loses its grip", the switch is pulled backwards by a spring, the
contacts open, and the current to the heating coil is interrupted.
You can hear (and feel) a gentle "thick" when the magnet switch pops
back and forth.

I've heard this sort of Iron referred to as a "Curie Point" Iron. Is this
the same thing?

Bob Stephens

It is VERY EASY to fix / repair the Weller WTCP units.

First, Are you positive you have the CORRECT TIP in this iron.

It MUST BE A Weller "PT" style tip - other Weller model tips such as the ET
series will cause this problem and damage the iron.

Greg
w9gb


"Joshua G Senecal" wrote in message
...
Hi all,

I have a Weller WTCPS soldering station with a 201U power supply and 201P
iron, using a 700 degree F tip. Last night I powered it up in preparation
for soldering some connectors, and a few minutes later I saw that the tip
and metal shaft of the iron were glowing red-hot.

Any ideas as to what is causing this, and will it be cheap to fix? Are
there any checks I can do to diagnose the problem? Or should I just dump
the thing and buy a new one? I bought the station over 11 years ago, in
practically new condition, at a yard sale for $5, so I got my money out
of it, but if a reliable fix is cheaper than purchasing a new soldering
setup I'd rather go that route.

Thanks!

-Josh, AE6IQ

--


Remove the reversed "nospam" in the address.

"Joshua G Senecal" wrote in message
...
Hi all,

I have a Weller WTCPS soldering station with a 201U power supply and 201P
iron, using a 700 degree F tip. Last night I powered it up in preparation
for soldering some connectors, and a few minutes later I saw that the tip
and metal shaft of the iron were glowing red-hot.

Any ideas as to what is causing this, and will it be cheap to fix? Are
there any checks I can do to diagnose the problem? Or should I just dump
the thing and buy a new one? I bought the station over 11 years ago, in
practically new condition, at a yard sale for $5, so I got my money out
of it, but if a reliable fix is cheaper than purchasing a new soldering
setup I'd rather go that route.

Thanks!

-Josh, AE6IQ

Josh -

Let's deal with your problem and Facts.

The WTCP series base only provides 24 volts - that's it - its a transformer
in a base.
The "brains" of the temperature control is the tip working in concert with
the SW60 switch assembly
The WTCP series has a unique click as the SW60 switch engages and
disengages - turning the heater on and off to maintain
the specific temperature engraved on the base of the removal tip.

The Red-Glow tells you 2 things:

1. The heater (Weller EC234) is still working (but you are shortening its
life operating in this manner - cherry red)
2. The WTCP series temperature control (which works with the "PT" tip and
the SW60 switch) is not working properly.

Recommend: Change tips. Improper tips will cause this problem.
Get a Weller PTA7 (which is the standard tip shipped with this iron).
The barrel net (BA-60 may also require replacement.

If iron exhibits identical problem - then the SW60 requires replacement
(shorted closed).

All parts for this specific model (WTCPS) are available from Wessco (So.
California).
Wessco also just ended a 1/2 price sale on Weller "PT" series tip in
November ($ 2.25 each)

I also have the Weller Tech Sheet for this model -- if you need
a copy. This has part numbers, diagrams and troubleshooting advice (shipped
with every unit new)

Yes, I will consider repairing for you - but it would have to be after the
holidays.
Greg
Repairing the Weller WTCP series since 1975

"G.Beat" wrote:

I also have the Weller Tech Sheet for this model -- if you need
a copy. This has part numbers, diagrams and troubleshooting advice (shipped
with every unit new)

Yes, I will consider repairing for you - but it would have to be after the
holidays.
Greg
Repairing the Weller WTCP series since 1975

I would like a copy of that, if you don't mind.

--
7 days!


Michael A. Terrell
Central Florida

Mike -

Sounds like I will have to get the scanner (for Acrobat Reader creation)
warned up this weekend - :-)

The Weller Tech Sheets (WTCP/ WTCPL; WTCPN; WTCPS and WTCPL) were available
directly from Weller (free) --
but have not asked for them --- since the factory was moved from the
Carolinas to Mexico last year.

Greg

"Michael A. Terrell" wrote in message
...
"G.Beat" wrote:

I also have the Weller Tech Sheet for this model -- if you need
a copy. This has part numbers, diagrams and troubleshooting advice
(shipped
with every unit new)

Yes, I will consider repairing for you - but it would have to be after
the
holidays.
Greg
Repairing the Weller WTCP series since 1975

I would like a copy of that, if you don't mind.

--
7 days!


Michael A. Terrell
Central Florida

"Michael A. Terrell" wrote in message ...
"G.Beat" wrote:

I also have the Weller Tech Sheet for this model -- if you need
a copy. This has part numbers, diagrams and troubleshooting advice (shipped
with every unit new)

Yes, I will consider repairing for you - but it would have to be after the
holidays.
Greg
Repairing the Weller WTCP series since 1975

I would like a copy of that, if you don't mind.

Bugger me - I'm glad you lot are not troubleshooting a nuclear power
station!
The Weller WTCP must be one of the simplest decent temperature
controlled irons on the market, mine runs 15hrs/day and does so year
in / year out. Sometimes more when I forget to turn it off - the new
ones dont have the neon in the mains switch so it does happen - I have
2 of them now, one on each bench...

Test procedure.

1. Runs continually, therefore base station and element OK.

2. Check switch - unscrew bit retainer and remove (iron off). Pull
tip in and out - should hear click if switch working. If not, then
switch or tip faulty.

3. LOOK at tip, see if mangnet thingo at bottom has fallen of - if so,
buy new tip (and after all the years youve had it, I wonder if it
could solder anything except 2 wires together, my tips last about 3
months on average, I buy them by the half dozen). If tip defective,
completely dismantle iron and remove magnet from switch assembly.

4. If tip OK (go on, be a devil, buy a new one anyway....) then switch
faulty. Buy new one.

5. Exception to item 4 - if you have done bugger all maintenance to
your iron, clean the garbage out of the barrel - it is rare for
switches to fail "on" (never had one do it, as a matter of fact, but
have only been using Wellers for 20 years so it COULD happen...) - use
a bamboo satay skewer to clean out the crap, then follow procedure 2.

Hope this helps,

de VK3BFA Andrew (at 50, an "official old grump")

"Andrew VK3BFA" wrote in message
om...
"Michael A. Terrell" wrote in message
...

3. LOOK at tip, see if mangnet thingo at bottom has fallen of - if so,
buy new tip (and after all the years youve had it, I wonder if it
could solder anything except 2 wires together, my tips last about 3
months on average, I buy them by the half dozen). If tip defective,
completely dismantle iron and remove magnet from switch assembly.

I have heard this from some other user - but I have tips that last years -
BUT I
only use the 700 degree tips.

4. If tip OK (go on, be a devil, buy a new one anyway....) then switch
faulty. Buy new one.

A spare tip should always be available on the bench. I just repaired an
older WTCPN station
an the college student had placed an "ET" tip (aka tips are all the same
right! - wrong)
from the Weller EC1000/EC2000/WES50/WES51 models.
Glowed cherry red -- changing to the proper tip -- corrected problem.

5. Exception to item 4 - if you have done bugger all maintenance to
your iron, clean the garbage out of the barrel - it is rare for
switches to fail "on" (never had one do it, as a matter of fact, but
have only been using Wellers for 20 years so it COULD happen...) - use
a bamboo satay skewer to clean out the crap, then follow procedure 2.

I saw my first internally shorted SW60 last year (although I think the user
had wacked it against a hard surface to
cause this type of damage). I also have seen a "kinked" spring -- near as I
can tell -- originally assembled that way --
over a decade earlier. I never saw a heater fail as shorted (dead short -
but not heating) until last year -- all previous ones
failed as "open". See enough stations and you see many failures, bad
operating practices and unique equipment abuse.

Hope this helps,

de VK3BFA Andrew (at 50, an "official old grump")

OK - As long as we have all this Weller knowledge here, who has the secret
stash of tips for the W200 iron? Yes, they made a 200 watt iron with the
magnetic temperature control, but I have been unable to find parts for many
years. Can't find W200 on the Weller web site.

Thanks in advance.

"G.Beat" wrote in message
news:idDEb.602781$Fm2.547319@attbi_s04...
"Andrew VK3BFA" wrote in message
om...
"Michael A. Terrell" wrote in message
...

3. LOOK at tip, see if mangnet thingo at bottom has fallen of - if so,
buy new tip (and after all the years youve had it, I wonder if it
could solder anything except 2 wires together, my tips last about 3
months on average, I buy them by the half dozen). If tip defective,
completely dismantle iron and remove magnet from switch assembly.

I have heard this from some other user - but I have tips that last years -
BUT I
only use the 700 degree tips.

4. If tip OK (go on, be a devil, buy a new one anyway....) then switch
faulty. Buy new one.

A spare tip should always be available on the bench. I just repaired an
older WTCPN station
an the college student had placed an "ET" tip (aka tips are all the same
right! - wrong)
from the Weller EC1000/EC2000/WES50/WES51 models.
Glowed cherry red -- changing to the proper tip -- corrected problem.

5. Exception to item 4 - if you have done bugger all maintenance to
your iron, clean the garbage out of the barrel - it is rare for
switches to fail "on" (never had one do it, as a matter of fact, but
have only been using Wellers for 20 years so it COULD happen...) - use
a bamboo satay skewer to clean out the crap, then follow procedure 2.

I saw my first internally shorted SW60 last year (although I think the
user
had wacked it against a hard surface to
cause this type of damage). I also have seen a "kinked" spring -- near as
I
can tell -- originally assembled that way --
over a decade earlier. I never saw a heater fail as shorted (dead short -
but not heating) until last year -- all previous ones
failed as "open". See enough stations and you see many failures, bad
operating practices and unique equipment abuse.

Hope this helps,

de VK3BFA Andrew (at 50, an "official old grump")

OK - As long as we have all this Weller knowledge here, who has the secret
stash of tips for the W200 iron? Yes, they made a 200 watt iron with the
magnetic temperature control, but I have been unable to find parts for many
years. Can't find W200 on the Weller web site.

Thanks in advance.

"G.Beat" wrote in message
news:idDEb.602781$Fm2.547319@attbi_s04...
"Andrew VK3BFA" wrote in message
om...
"Michael A. Terrell" wrote in message
...

3. LOOK at tip, see if mangnet thingo at bottom has fallen of - if so,
buy new tip (and after all the years youve had it, I wonder if it
could solder anything except 2 wires together, my tips last about 3
months on average, I buy them by the half dozen). If tip defective,
completely dismantle iron and remove magnet from switch assembly.

I have heard this from some other user - but I have tips that last years -
BUT I
only use the 700 degree tips.

4. If tip OK (go on, be a devil, buy a new one anyway....) then switch
faulty. Buy new one.

A spare tip should always be available on the bench. I just repaired an
older WTCPN station
an the college student had placed an "ET" tip (aka tips are all the same
right! - wrong)
from the Weller EC1000/EC2000/WES50/WES51 models.
Glowed cherry red -- changing to the proper tip -- corrected problem.

5. Exception to item 4 - if you have done bugger all maintenance to
your iron, clean the garbage out of the barrel - it is rare for
switches to fail "on" (never had one do it, as a matter of fact, but
have only been using Wellers for 20 years so it COULD happen...) - use
a bamboo satay skewer to clean out the crap, then follow procedure 2.

I saw my first internally shorted SW60 last year (although I think the
user
had wacked it against a hard surface to
cause this type of damage). I also have seen a "kinked" spring -- near as
I
can tell -- originally assembled that way --
over a decade earlier. I never saw a heater fail as shorted (dead short -
but not heating) until last year -- all previous ones
failed as "open". See enough stations and you see many failures, bad
operating practices and unique equipment abuse.

Hope this helps,

de VK3BFA Andrew (at 50, an "official old grump")