Author Topic: Weller WECP-20 repair  (Read 5224 times)

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Offline RefrigeratorTopic starter

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Weller WECP-20 repair
« on: August 05, 2016, 09:02:40 pm »
I got my weller from a flea market for 10 bucks and i don't feel like buying a new hand-piece, the thermistor and heating element both died today.

I know that both Weller and Hakko use thermistors, i would like to keep the station but replace the hand-piece with a hakko one.

Would appreciate if someone could poke their Weller thermistor with an ohm meter, Hakko ones are about 50 ohms at room temp.

Thanks.
« Last Edit: August 05, 2016, 09:09:07 pm by Refrigerator »
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Offline Andy Watson

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Re: Weller WECP-20 repair
« Reply #1 on: August 05, 2016, 09:28:32 pm »
About 22\$\Omega\$ according to the service manual.

http://remotesmart.wikidot.com/weller-wecp-20
 
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Offline RefrigeratorTopic starter

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Re: Weller WECP-20 repair
« Reply #2 on: August 06, 2016, 08:49:56 am »
Thanks.
Seems like i'll need to do some mods to fit the Hakko iron to the weller station.
Weller thermistor gains about 7.73 ohms per 100oC, while Hakko one gains about 20ohms per 100oC.
Should not be too difficult to mod, as long as i can get it to maintain 300oC i'll be happy.
I have a blog at http://brimmingideas.blogspot.com/ . Now less empty than ever before !
An expert of making MOSFETs explode.
 

Offline w9gb

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Re: Weller WECP-20 repair
« Reply #3 on: September 20, 2024, 06:25:40 pm »
Weller WECP20 Service Manual (Germany), attached below.

The Weller EC-series (1977-2003) used Type-K thermocouples.
The EC-1201(North America) and LR-21 (Europe) iron was discontinued around 2020.

gb
 

Online inse

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Re: Weller WECP-20 repair
« Reply #4 on: September 20, 2024, 06:52:09 pm »
This service manual says 32.7Ohms at 150C and 53.7Ohms at 450C, so you are going to need a parallel resistor.
Maybe there is a chance to adjust for a usable temperature scale with the two trimmers.
« Last Edit: September 20, 2024, 06:56:53 pm by inse »
 

Offline RefrigeratorTopic starter

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Re: Weller WECP-20 repair
« Reply #5 on: October 03, 2024, 06:10:03 am »
This thread has been dead for 8 years and i've since switched to T12 tips and stations.  ;D
But the user manual might help other people who are looking into repairing their soldering station.
I have a blog at http://brimmingideas.blogspot.com/ . Now less empty than ever before !
An expert of making MOSFETs explode.
 


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