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Old 28th March 2013, 09:43 PM   #1
diyAudio Member
Join Date: Feb 2013
Default Problem with weller WECP-20

Hi I am writing because I have a strange problem with my Weller WECP-20 soldering station.

When I power on it, the led is on, the stylo became hot but a some point it turn off and the tip stops heating. Some times the tip is too cold to solder well, and if it became hot enough it stay hot for a little.

If I point the pot to 350 (with other 100 more avaibles) the station starts going on, it stops, but if I try to increase the temperature the led stay off.

I can't understand why. referring to the official manual I changed the voltage regulator and tested the OP-Amp that seems ok.

Sometimes the solder works, sometimes not, I can't figure out why. The thermal sensor have 25ohms resistance and the resistance of the heating component is 12 ohms.

can you please help me in fugure out what's the problem??
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Old 28th March 2013, 11:25 PM   #2
DUG is offline DUG  Canada
diyAudio Member
Join Date: Jan 2003
Location: mississauga ontario canada
Try 360C-365C setting.
Doug We are all learning...we can all help
"You can't stop the signal, Mal. Everything goes somewhere..."
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Old 29th March 2013, 12:06 AM   #3
diyAudio Member
Join Date: Feb 2013
no matter the temperature, my 350 in the first post was in example. The heating stops too early.

by the way, I tried also with 360, 365, no differences.
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Old 29th March 2013, 01:42 AM   #4
diyAudio Member
Join Date: Feb 2013
MM ... unfortunately after couple hours of trying i removed the temperature sensor, connected to the ohmmeter and registered this:

cold: 25ohms

touching with the tip of another solder iron, after something like 3 seconds: overscale

immediatly I touched also with my finger, obviously the tip was barely warm. I figure out the range of the resistance of the sensor is 22 - 58 ohms (more or less) thanks to a trim pot connected instead the sensor and few tests.

Now I connected a 56R resistor instead of the sensor, but I think I need a very expensive (about 40€) sensor.... damn..
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Old 2nd April 2013, 08:08 AM   #5
diyAudio Member
Join Date: Jul 2003
Location: Dona paula, Goa
I had one of these iron without the station. I connected one constant current source initially, but later connected 15 Volts dc laptop PSU. I have another iron that gets very hot for difficult jobs, and this is now kept for pcb duty only.

Gajanan Phadte
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