What us this component?

[danrogers]

I am doing some fault finding on a set of hair straighteners. They have a wierd fault, a intermittent connection it seems although it is not the cable. they also make a hissing noise as the power led flashes on and off. I opened them up and it sounded like the hissing might have been coming from this component - what is it?

**broken link removed**

 

[ronv]

It looks like a 100 nfd. 275 volt across the line capacitor.

 

[Jaguarjoe]

Waaaaaaaaaaaaaay more than you'd ever want to know:

https://www.electro-tech-online.com/custompdfs/2011/03/pcx2_335m_t100.pdf

 

[ericgibbs]

Waaaaaaaaaaaaaay more than you'd ever want to know:

https://www.electro-tech-online.com/custompdfs/2011/03/pcx2_335m_t100-1.pdf

hi,
As Ronv says its a 100nF 275Vac Cap, but if it was failing, say short short or open circuit, it would not make the dryer work intermittently.
From limited view of the PCB it looks as though the 100nF is powering the LED.

Its more likely there is a 'bad' soldering connection on the PCB wiring, check the back of the PCB.

 

[danrogers]

Hi Eric, Thanks for the help guys

Well I have re-flowed the solder. So its an interference cap is it.... That might explain the light flashing on and off, and the noise they make? They are pretty intermittent. I would say the noise sounds like interference of some sort?

What would you think the resistance should be across a working cap of that value? I will check it tonight when I get home from work.

Also what package is it - if I need to get a replacement?

Thanks all

 

[ericgibbs]

Hi Eric, Thanks for the help guys

Well I have re-flowed the solder. So its an interference cap is it.... That might explain the light flashing on and off, and the noise they make? They are pretty intermittent. I would say the noise sounds like interference of some sort?

What would you think the resistance should be across a working cap of that value? I will check it tonight when I get home from work.

Also what package is it - if I need to get a replacement?

Thanks all

hi,
The cap in the pdf you posted will be OK, ensure that lead spacing on the new cap is same as the old one..
The resistance should be VERY high across the cap when its out of the circuit PCB.

 

[Gary B]

A small cap like that will read like an open with a ohm meter.

 

[danrogers]

I did not post the Pdf, I can't seem to find that brand on Radio Spares. I will measure the lead spacing though thanks! Plastic film I guess?

So its likely that mine may have gone S/C, or i suppose that would blow the fuse? If it has gone O/C is that likely to cause the issues they appear to have?

Thanks again

 

[ericgibbs]

I did not post the Pdf, I can't seem to find that brand on Radio Spares. I will measure the lead spacing though thanks! Plastic film I guess?

So its likely that mine may have gone S/C, or i suppose that would blow the fuse? If it has gone O/C is that likely to cause the issues they appear to have?

Thanks again

hi,
Look at these links... Maplin stock them

metallised paper RFI class X2 - Pesquisa Google

also Farnell
https://uk.farnell.com/jsp/search/browse.jsp?N=500006+1000229+5586122+5655004&Ntk=gensearch_001&Ntt=metallised+paper+RFI+class+X2&Ntx=mode+matchallpartial&No=0&getResults=true&appliedparametrics=true&locale=en_UK&catalogId=&prevNValues=500006+1000229&filtersHidden=false&appliedHidden=false&originalQueryURL=%2Fjsp%2Fsearch%2Fbrowse.jsp%3FN%3D500006%2B1000229%26Ntk%3Dgensearch_001%26Ntt%3Dmetallised%2Bpaper%2BRFI%2Bclass%2BX2%26Ntx%3Dmode%2Bmatchallpartial%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Den_UK%26catalogId%3D%26prevNValues%3D500006%2B1000229

https://uk.farnell.com/panasonic/ecqu2a104kla/capacitor-x2-0-1uf-275v-10/dp/1673308

 

[Jaguarjoe]

For troubleshooting purposes you can run the hair dryer without that cap. It is not a key component.

 

[danrogers]

Well I'm pretty stumped for tonight - I took the cap out of the circuit and it did not function at all. I re-soldered it then the same noise and intermittent LED + heat.

I have recorded a short video from my mobile (all i have got in the shed lol) hopefully you can hear the cracking which corresonds to the LED flashing on and off... Any ideas? Oh the my mulitmeter has a flat battery so I can't measure the cap tonight

**broken link removed**

 

[ronv]

For some reason I can't get your video, but I have heard some strange noises from switches that have poor contacts.

 

[colin55]

The fault on my dryer was the lead.

 

[ericgibbs]

hi Dan,
Your video just hangs up during download.
I did say in an earlier post, that the fault you are describing would not be the 100nF cap.
Like Ronv suggests, a 'dicky' switch contact will give a sizzling sound [ frying bacon], also a poor switch will give off a 'burning' smell.

 

[danrogers]

Hi guys. I should have checked the video maybe I have the wrong location I will check it out when I'm home later.

The switch could well be the issue I guess, although when applying pressure to it the problem still persists. I will re-solder it, if that fails I will re-move and check the switch.

thanks

 

[danrogers]

Thanks for the help, you were correct again Eric & ronv

For some reason one pole of the switch has a high resistance. Luckily its a double so I have just turned it around now they work

All the best

 

[ronv]

Cool....