Thanks in advance for any replies given!
I have a circuit to repair with a strangely marked capacitor. It is a red disc capacitor and the only markings on it is "15KK" in bold black. All information available indicates I should see at least 3 digits to identify it.
Prometheus
What is it in ( equipment )? I dont think you have a capacitor there. Is it in a tv, and is there a demagnetizing coil connected to it anywhere? JTT
If it's small, it could easily be a ceramic disc capacitor of 15pF.
Though three digits are technically necessary, "150" = 15pF doesn't make sense, you look at it and think, oh, 150pF. So they label them in two digits.
If it's conductive, then nevermind!
Tim
-- Deep Fryer: a very philosophical monk.
Thank you all again for your replies.
As it turns out the component looks like a disc capacitor but it measures 18 KOhms. I have never seen a disc shaped resistor? I realize this could simply be a defective cap. by having any conductance so I am still a little lost.
As for the question regarding the equipment, I am attempting to repair an unobtainable intermittent relay controller for the wipers on an early model Porche. I have been all around the Net and news groups and can find no replacement so "I fix!". ;-).
Eric
"Prometheus" wrote in news: snipped-for-privacy@u72g2000cwu.googlegroups.com:
Not sure if a thermistor would have a role in that unit, but test to see if it changes resistance with heat, 15KK as marking, and 18K as measured value hint at thermistors, as does that shape, some older thermistors were large, especially if they were used with moderate currents to avoid more complex circuitry to control them.
If it was a defective disk capacitor reading 18K, you'd probably see something burnt on it somewhere, so I doubt it's that. Can you get an ASCII drawing of that part of the circuit? The context would help. Or a link to pictures of both sides of the board.
Its got to be a posistor, as it heats from the current of the relay it goes positive resistance to the point the relay kicks out. Then as it cools the resistance drops and re-energizes the relay. It probably about 1/4 inch thick right? What is the wiper/delay not doing? Not running at all or not running in delay mode? JTT.
"James Thompson" wrote in news:cb4c9$443ff6e4$438c8615$ snipped-for-privacy@ALLTEL.NET:
Makes sense, that reminds me that there used to be heating elements used in the blinker switches for cars, same idea there. I guess this wiper might be meant to run in periodic sweeps, not continuously.
Its real easy - measure the resistance then warm it up with your soldering iron, if the resistance changes its a thermistor, if not then its a leaky capacitor!
Hello all,
You guys are the genuine article!
Problem solved. It's a thermistor or posistor. Resistance goes down to about 3K with heat from a flame.
Thanks again
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