Weller WECP-20 is adjustable soldering iron and Weller WTCP-s
Temperatures From 50 to 450 Degrees Celsius
6-Channel Connection Socket
Visible Regulation Control
Here is the opetation manual http://www.egmont.com.pl/cooper/instrukcje/OI_WECP20.pdf
Analogue temperature regulation is carried out using a potentiometer which can be used to set the temperature continuously in a range of 50 to 450 degrees Celsius. A green LED indicates the status of the regulation.English PDF manual: (click the picture)
or
http://www.artisantg.com/info/PDF__57656C6C65725F5745435032305F44617461736865657432.pdf
Weller WECP-20 TIP is ET-A — ET-S
The tip diameter is 0.8,1.2, 2.0, 2.4,3.2,4.6 or 5.6mm .
ET-S is 0.8mm, others go from ET-A to ET-H.
The temperature sensor for WECP-20
It is available from Farnell https://uk.farnell.com/weller/52641099/temperature-sensor-lr21-soldering/dp/2584922
It will cost about 60 euros .
In TME it is 57e
https://www.tme.eu/en/details/wel.el-21/soldering-stations-accessories/weller/t0052411099n/
John from Holland asked cheaper PTC resistor, but I have not found.
It said that it is manufactured in Germany, but I have not found the place.
The solder without transformer you can find from Weller sales place
https://www.amazon.de/Weller-WLIR3023C-Soldering-Ergonomically-Shaped/dp/B09DD1YKT1?ref_=ast_sto_dp&th=1#
It cost about 40 euros.
The cheaper solder is in Aliexpress place under 10e .
Then there is an adater from LT/ET. All LT-series tip will got to ET-series solder lin WECP-20.
This adapter costs about 20 euros. Tips cost about 5-7e.
This a tool 10311 for Weller WECP-20 costs about 5-6 euros
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My WECP-20 is working well, but if it will go break, I prepare a schematic diagram
24.9.2016 Well ,not any more. The tip stopped to heat. When I move the connetion to Weller, it started to work again.
I open the Weller and tried to find a bad connection, but I didn't find anything.
I put Weller back in service. Let see if it will do same again.
I took a picture and put on top of this page.
Vit Vaculik from Czech Republic has done PCB for WECP-20 2.8.2015
and
and pcbs
and Eagle PCB file
http://remotesmart.wikidot.com/local--files/weller-wecp-20/Weller_wecp-20pcb.brd
Thank you for your work!
Just click the pdf-pictures.
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Weller Temperature sensor 52641099 from Farnell 458247
Click for SL443A pdf
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WECP layout
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WECP-20 heat sensor
PTC 22ohmia
50 24,65
60 25,50
70 26,33
80 27,16
90 28,00
100 28,82
110 29,61
120 30,43
130 31,31
140 32,14
150 32,94
160 33,74
170 34,55
180 35,41
190 36,19
200 36,96
210 37,75
220 38,53
240 40,12
250 40,88
260 41,67
270 42,40
280 43,17
290 43,94
300 44,69
310 45,45
320 46,25
330 46,95
340 47,74
350 48,47
360 49,26
370 49,95
380 50,69
390 51,39
400 52,11
410 52,82
420 53,62
430 54,38
440 55,12
450 55,86
Here is Excel graphics from 22 ohms PTC
It is available https://fi.farnell.com/vishay/ptccl09h171hbe/thermistor-ptc-22r-20-radial/dp/1187083?st=ptc%2022
Price 1.76e
Service manual
Weller WCEP-20 Repair
4.2.2021 happens two things.
My cheap Chinese solder iron stopped to work. It has heater welder open.
I do not have welder and took my Weller WCEP-20 to use.
It started to heat, but just a little.
I was wondering what has happened?
I open the welder case and measure heater voltages.
The 5V regulator gives 6.4V as it should,
The opamp LM358 was working.
The - input pin 2 was 1,554V and + input pin 3 was 1.547V.
The output pin 1 was 4.6V when the heater was off and 0.03V when the heater was on.
I try to increase the pot P2, but it was already 0 ohms.
I try decrease P1, but it helped only little.
I try to decrease R7 (4.02) resistor, but it needed more soldering equipment.
I went to sleep and in the morning I went to my garage to search more Weller and I wound WTCPS-S soldering iron.
I changed R7 to 4.02k // 4.02k resistor i.e. 2k, no help
Then I added on R7 1k resistor, it helped a little.
Then I put R8 3.58k on top 2.2k it helped a quite much.
The solder iron worked just when I put heater to top maximum.
I do my work now and return to this later
28.5.2022
The Weller has been working well after repair. but I have bought many Chinese soldiers
I also bought separate heater resistors and I have used them.
This solder cost 7 e + 2.2e for the postage at AliExpress.
It has no isolation transformer and not the holder.
It is thyristor controller.
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In 23.2.2023 one French engineer write to me and asked help to made Wecp-20 PCB board.
I have had this Vit Vaculik Eagle made files about ten years, but it doesn't was enough for him.
So I did a new schematic diagram so that better suits for PCB design. I did net list and open my WECP-20 tool and measure PCB size.
Then I design a new PCB.
I did also Gerber and drilling files for the manufacturing :
[http://remotesmart.wikidot.com/weller-wecp-20/weller.zip]
Go to https://jlcpcb.com and send these files to them.
This PCB needed a little changed schematic
Ask help.
4.3.2023 One of Italian radio amateur took this file and send to the JBLPCB.
Let see what he has got.
11.3.2023
One Italian guy has a problem with 22 ohm PTC resistor
I try to explain how of it works
The PTC resistor changed its ohms value according the temperature from 25C to 400C from 22ohm to 400 ohms
Pins 2 and 3 should be about the same, when the PTC resistor has heated to right temperature.
But what is right temperature?
It depends the settings of P3 potentiometer,
It can change from 1,7V to 6.4V.
It means 100C to 400C.
The potentimeter setting is compared to PTC setiing with a amplifier IC2:b.
Then the output of the amplifier IC2:B is connected to Zerovolt Triac decoder SL443A.
It has 24VAC input to pin 2.
And 24V DC input to pin 3.
It had a DC control input at pin 8.
It has a waveform generator and zero voltage detector,
When the output (at the input pin 8) is high, the detector notes when the AC voltage is zero and gives a small pulse to Triac.
This pulse fires the Triac and heats full 50Hz cycle.
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He has also a 5 pin heater connector ( female) broken.
He want to know were he can get them.
I looked my favorite electronic shop in Poland TME and found very cheap 5 pin female connector.
https://www.tme.eu/en/details/en2p5m26/switchcraft-connectors/switchcraft/
Today 17.3.2023 I got two pictures from my French friend
He has got PCBs from JBLPCB
Let see, if he can get them working.
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10.6.2023 I got a message from A.B.
He has got 5 PCBs from JLCPCB
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Weller WTCP-S Problen
At March 2024 I was doing my WIFI test circuit, but my Weller WTCP-S solder doesn't work.
I was thinking, that magnetic switch has worked out like about five years since.
I open the solder and using a small file I cleaned the switch.
I measured with ohm meter, that it should work.
However the solder doesn't work,
What is fault?
I measure that the power supply gives 24VAC and the magnetic switch was working.
Then I found the heater, which should has 12 ohm resistor was open.
I used the Internet, but the heater was not available in Finland.
I could buy the whole solder, but it will cost about 250 e.
I was looking the heater and found a small breakout in the heater wire.
I used normal 0.5mm thick wire and repair it.
It worked but let see how well.
The repair took much less money than buying a new solder.
The temperature adjustment is done with different heaters.
They are marked 5,6,7,8 and 9 .
They means 500.600,700,800 and 900 C.
Pekka OH3GDO
moc.liamg|odg3ho#moc.liamg|odg3ho
