Anyone know this KEF part?

Cloth Ears · 17th June 2007, 09:07 AM

I borrowed a friends KEF PSW2000 subwoofer to find out why it powered on (green light) but produced no sound.

I'm not sure what the U8 chip is, as it seems to have been obliterated after the green cap vomited all over it!

Can anyone tell me what 224K means on the capacitor?

big jim · 17th June 2007, 09:10 AM

220n

jim

Cloth Ears · 17th June 2007, 09:13 AM

Cool, because that's the right size for the cap. Any idea where the K comes from, or is that one of those "lost in time" things like mF for microfarad (and MF for Milifarad) in the US?

richie00boy · 17th June 2007, 09:43 AM

K=10% tolerance
J=5% tolerance

justblair · 17th June 2007, 10:00 AM

This site has a usefull Calculator
Electronics 2000

Though this site I find more usefull, cause I can never remember the scientific notation. Fortunately my GF is a sciency type. She can do the conversions in her head

Transtronics

stoolpigeon · 17th June 2007, 10:19 AM

These subs had a problem with the speaker relay failing.

IIRC it is blue with a silly name like "Lucky Sky".

Cloth Ears · 17th June 2007, 10:18 PM

Quote:

Originally posted by stoolpigeon
These subs had a problem with the speaker relay failing.

IIRC it is blue with a silly name like "Lucky Sky".

Well, from the picture (in post #1), it looks like the cap may be to blame. I won't be fixing it, I was just looking for the problem. Now that I've found it I'll let him decide what to do with it...

17th June 2007, 09:13 AM	#3
Cloth Ears diyAudio Member Join Date: Dec 2001 Location: Melbourne, Australia	Cool, because that's the right size for the cap. Any idea where the K comes from, or is that one of those "lost in time" things like mF for microfarad (and MF for Milifarad) in the US? __________________ Jont. "It is impossible to build a fool proof system; because fools are so ingenious."

17th June 2007, 09:43 AM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	K=10% tolerance J=5% tolerance __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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17th June 2007, 09:10 AM	#2
big jim diyAudio Member Join Date: Feb 2006 Location: london	220n jim

17th June 2007, 10:00 AM	#5
justblair diyAudio Member Join Date: Jan 2007 Location: Glasgow, Scotland	This site has a usefull Calculator Electronics 2000 Though this site I find more usefull, cause I can never remember the scientific notation. Fortunately my GF is a sciency type. She can do the conversions in her head Transtronics

17th June 2007, 10:19 AM	#6
stoolpigeon diyAudio Member Join Date: Feb 2007 Location: Laputa	These subs had a problem with the speaker relay failing. IIRC it is blue with a silly name like "Lucky Sky".

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