can you id this component

moss99 · 26th February 2009, 11:40 AM

Hi all i have a pair of mission 731 speakers which the tweeter in one does not work i have continuity through the driver which led me to the xover i have put a photo up ,,
I think the component with 475K 100V written on it is at fault i have removed it and am getting an open circuit reading is this a resistor of some type and any idea where to get one ?

poynton · 26th February 2009, 11:43 AM

It is a capacitor and will read open circuit.

Please post a photo or 2

Andy

Frank Berry · 26th February 2009, 12:51 PM

Probably 4.7 uf @ 100 volts.

pilli · 26th February 2009, 01:27 PM

Quote:

Originally posted by moss99
I think the component with 475K 100V written on it is at fault i have removed it and am getting an open circuit reading is this a resistor of some type and any idea where to get one ?

As it's been said, the marking "sounds" like a capacitor ("K" is the tolerance code)
and a capacitor is supposed to give an open circuit reading (on an ohm-meter) when it is good, there's a dielectric (isolation) in there...

Quote:

i have put a photo up

I don't think we can see it.
_

quasi · 26th February 2009, 01:30 PM

You can test the capacitor by connecting to an ohmeter and taking a reading. Then reverse the leads. If the capacitor is good you will see continuity until the cap charges up. After this happens you will see open cct again. Reverse the leads again and you will see the cap discharge and then charge again to an "open cct state". If you get this then the cap is ok. If you don't then it really is open. Use a high range scale like 200k on your meter.

Cheers
Quasi

moss99 · 26th February 2009, 07:35 PM

Hmmm i can see the photo i did have a bit of trouble posting the photo i will try again ,,
Mission have e-mailed me back today they only sell the whole crossover not the components,,

mjf · 26th February 2009, 08:33 PM

hello.
i think it is a (film/foil)cap with 4,7uf/100v.
greetings.........

pilli · 26th February 2009, 08:46 PM

Now the photo is visible.
Could you post the picture or schematic (it shouldn't be too difficult to trace it)
of the whole crossover?

-

Trevorferns · 27th March 2009, 08:02 AM

The value is 4700000 pF, 10%, 100 volts. In other words its 4.7uF

26th February 2009, 11:43 AM	#2
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	It is a capacitor and will read open circuit. Please post a photo or 2 Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

26th February 2009, 12:51 PM	#3
Frank Berry diyAudio Member Join Date: Sep 2003 Location: Midland, Michigan	Probably 4.7 uf @ 100 volts. __________________ Frank

26th February 2009, 01:30 PM	#5
quasi diyAudio Member Join Date: Sep 2004 Location: Adelaide, Australia	You can test the capacitor by connecting to an ohmeter and taking a reading. Then reverse the leads. If the capacitor is good you will see continuity until the cap charges up. After this happens you will see open cct again. Reverse the leads again and you will see the cap discharge and then charge again to an "open cct state". If you get this then the cap is ok. If you don't then it really is open. Use a high range scale like 200k on your meter. Cheers Quasi __________________ http://sites.google.com/site/quasisdiyaudiosite/

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26th February 2009, 07:35 PM	#6
moss99 diyAudio Member Join Date: Feb 2009	Hmmm i can see the photo i did have a bit of trouble posting the photo i will try again ,, Mission have e-mailed me back today they only sell the whole crossover not the components,,

26th February 2009, 08:33 PM	#7
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. i think it is a (film/foil)cap with 4,7uf/100v. greetings.........

26th February 2009, 08:46 PM	#8
pilli diyAudio Member Join Date: Aug 2006	Now the photo is visible. Could you post the picture or schematic (it shouldn't be too difficult to trace it) of the whole crossover? -

27th March 2009, 08:02 AM	#9
Trevorferns diyAudio Member Join Date: Jun 2008	The value is 4700000 pF, 10%, 100 volts. In other words its 4.7uF

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