Weller WES51 Overheating Problem

Thread Starter

raz4u

Joined May 21, 2021
4
Hi , I have Weller WES51 for last two year its been working fine but lately notice the pencil is overheating. Also have another WES51 working just fine so did compare both circuit did some measurements find one component measure very off reading 02U1. Can some one know what this component is ? Red Arrow in picture please share the part number if someone has it.Thanks
 

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anniel747

Joined Oct 18, 2020
1,034
Hi , I have Weller WES51 for last two year its been working fine but lately notice the pencil is overheating. Also have another WES51 working just fine so did compare both circuit did some measurements find one component measure very off reading 02U1. Can some one know what this component is ? Red Arrow in picture please share the part number if someone has it.Thanks
Looks like a PTC.
 

MisterBill2

Joined Jan 23, 2018
8,736
That device looks like a chip resistor, and it also looks OK. How did you measure it? And can you measure the same part on the other iron control board? What was the resistance reading and what did you expect it to be???
 

Thread Starter

raz4u

Joined May 21, 2021
4
My Guess is its a PTC Fuse the second soldering iron this device is label LF020 After little research find out it is a Temperature Coefficient Fuse.
 

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KJ6EAD

Joined Apr 30, 2011
1,578
Before you get too far down the board/component repair rabbit hole, make sure you have a fully functional iron plugged in. Element and sensor faults are not uncommon. If you have a known good iron, plug it in to the suspect base to test.
 

anniel747

Joined Oct 18, 2020
1,034
Before you get too far down the board/component repair rabbit hole, make sure you have a fully functional iron plugged in. Element and sensor faults are not uncommon. If you have a known good iron, plug it in to the suspect base to test.
Good point to bring up but he has 2 stations so he probably already cross tested.
 

MisterBill2

Joined Jan 23, 2018
8,736
Good point to bring up but he has 2 stations so he probably already cross tested.
The TS has made no mention of swapping the two irons to see if the problem is with the iron or the controller. So I would not presume that any such swap has been tried. It does make a whole lot of sene to do that.
 

anniel747

Joined Oct 18, 2020
1,034
The TS has made no mention of swapping the two irons to see if the problem is with the iron or the controller. So I would not presume that any such swap has been tried. It does make a whole lot of sene to do that.
That would be the first sensible thing anybody would try but sometime the most easy tests are forgotten.
 
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