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Component identification help

Picooz

Nov 1, 2016
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Hi, This is my first post I have limited experience in repairing electronic items, but I do enjoy trying to repair them. I am trying to repair a eberspacher heating control and I can not identify a component. I think it may be a capacitor, the markings on the component are 100nt 12v. I am hoping that somebody will be able to help me, I have included an image of the component and the circuit board. The board is not complete as I have taken the transistors off for testing. Cheers Steven
 

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Arouse1973

Adam
Dec 18, 2013
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Hi Steven, welcome to E.P. It might actually be a surge suppressor and not a capacitor. Is it short circuit? Edit: Or an NTC
Adam
 

davenn

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Sep 5, 2009
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14,045
hi Steven

yes, looks like a 100n (0.1uF) capacitor
use one the save cap value, doesn't matter if the voltage rating is higher

so is there a reason why you think it's faulty and needs replacing? do you have a capacitance meter?
 

Picooz

Nov 1, 2016
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Hi Steven, welcome to E.P. It might actually be a surge suppressor and not a capacitor. Is it short circuit? Edit: Or an NTC
Adam[/QUOTE
hi Steven

yes, looks like a 100n (0.1uF) capacitor
use one the save cap value, doesn't matter if the voltage rating is higher

so is there a reason why you think it's faulty and needs replacing? do you have a capacitance meter?

Hi, thank you for the quick response, I have measured it with a capacitance meter and the reading is 185nf, could you help me with the type of capacitor it is? Thank you
 

Picooz

Nov 1, 2016
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Hi Steven, welcome to E.P. It might actually be a surge suppressor and not a capacitor. Is it short circuit? Edit: Or an NTC
Adam
Hi, thank you for the quick response, I have checked it for short circuit and it seems fine, I have done capacitance test on it and have a reading of 185 nf. Cheers Steven
 
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Picooz

Nov 1, 2016
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Nov 1, 2016
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hi Steven

yes, looks like a 100n (0.1uF) capacitor
use one the save cap value, doesn't matter if the voltage rating is higher

so is there a reason why you think it's faulty and needs replacing? do you have a capacitance meter?

Hi, thank you for the quick response, I have measured it with a capacitance meter and the reading is 185nf, could you help me with the type of capacitor it is? Thank you
 

Arouse1973

Adam
Dec 18, 2013
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Can you point us to where in the circuit this came from?
Thanks
Adam
 

Arouse1973

Adam
Dec 18, 2013
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Out of interest does it read anything on a resistance measurement?
Thanks
Adam
 

davenn

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Sep 5, 2009
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Hi, yes on a auto range it will gradually climb until it goes out of range. Hope this helps.

yup just proves its a capacitor rather than a resistive device

Hi, thank you for the quick response, I have measured it with a capacitance meter and the reading is 185nf, could you help me with the type of capacitor it is? Thank you

a bit high for a 100n but if it's just being used for power rail bypassing, that doesn't really matter

it's a ceramic style
 

Arouse1973

Adam
Dec 18, 2013
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Yes I thought it seemed a bit high myself. I have never seen a capacitor with the value marked in Nano Farads and that bulge on the back side is indicative of MOVs, NTCs and PTC. That's the reason I discounted it from being a capacitor.
Adam
 

Picooz

Nov 1, 2016
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Yes I thought it seemed a bit high myself. I have never seen a capacitor with the value marked in Nano Farads and that bulge on the back side is indicative of MOVs, NTCs and PTC. That's the reason I discounted it from being a capacitor.
Adam

Hi, cheers for the feedback, I have found a manufacturer date of 1974 on the board, just for interest.
 

davenn

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Hi, cheers for the feedback, I have found a manufacturer date of 1974 on the board, just for interest.

no harm replacing that cap, 100nF (0.1uF) are very common
you may have a newer scrap PCB or 2 lying around that you can recover a cap from :)
 

Picooz

Nov 1, 2016
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yup just proves its a capacitor rather than a resistive device
Hi, thank you for your reply.


a bit high for a 100n but if it's just being used for power rail bypassing, that doesn't really matter

it's a ceramic style
 

Picooz

Nov 1, 2016
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Hi, thank you for the help, I'll get one installed and see how it goes.
 
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