Need help with charred resistor on digital soldering iron GS110D (SOLVED)

[Koray]

Hi all,

I have this great digitally controlled 110W soldering iron which worked perfectly over a year, but somehow made some cracking noises and died on me recently. I opened it and found a charred blue resistor in-line with mains. Unfortunately I cannot read the color bands on it. I am including some clear photos below, can anyone help?

Thanks in advance!

Koray

SOLVED: it is an 82 ohm metal film resistor.

[ciccio]

I have the smaller 50 W version, the PCB is labeled CXG DS V2.
Mine has an 82 ohm resistor  (gray-red-back) , but the color code of yours seems different.
The manufacurer is SHENZEN CGX ELECTRONICS INDUSTRIAL CO. LTD.
the site is http://www.cxg.cn/en/index.html
Maybe they can help you.
Best regards

[Koray]

Thank you Ciccio. I will contact the manufacturer.

Kind regards

Koray

[Koray]

I have the smaller 50 W version, the PCB is labeled CXG DS V2.
Mine has an 82 ohm resistor  (gray-red-back) , but the color code of yours seems different.

Hi Ciccio,
Manufacturer is of no help. I tried using my daughters toy microscope and I think I have a better idea now. The resistor seems to have gray(or silver?), black, , gold bands on it. Since you mentioned 82 ohms, I assume the charred band on mine is also black, which makes it 80 ohms. But that doesn't match any standard resistor value. Attaching a photo of the resistor. Is there a way to calculate the required resistor there? 
Thanks for help!
Koray

 

[Chris56000]

Hi!

I can make it out – it's coloured brown – grey – black with a final gold band which comes out as 18R – a standard E12 value @ ±5% tolerance – I suspect the charred portion wasn't over any coded part of it's body!

Since your iron is 110W nominal it's reasonable to assume a lower value than the 82R used in the 50W versions!

Give an 18R a go and let us know how you get on!

Chris Williams

[Koray]

Thanks Chris! I cannot see any brown rings there, also the order you suggest doesn't fit the photo. I decided to buy another one to check for the real part specs...

From now on I will follow Dave's motto for my new stuff: don't turn it on, take it apart (and take pictures). :-)

Thanks for help! I will update when I receive the new one.

Koray

[Koray]

Update on this issue. Ciccio was right, it is an 82 ohm resistor. It turns out that the red ring on the resistor had faded.  I put a 1/2w metal film resistor and now the soldering iron works great.

Thanks for all help!

K.

[ciccio]

I'm really happy for having helpad you.
Best regards