KEF Kube 1 repair

DistortionNat

Active Member
Hi
My kube refuses to power on so I took the amp out and have spotted a component that has burnt out.
Is this a diy job or do I need to send it off?
Any help would be greatly appreciated, I don't have the money to fork out right now so cheap is good :)

Cheers

Nat.
 

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IronGiant

Moderator
I assume you meant KEF Kube, not Key Kube? I've amended the title.
 

Frank1471

Member
You will need to remove it to find its value as (AFAIK) no circuit diagram is available.
It's a capacitor and should be easily replaceable.
Frank
 

DistortionNat

Active Member
Excellent. Also the yellow thing next to it (transformer?) has plastic around it and it looks a little melted. Is this something that could have also gone and should I replace it?
 

Frank1471

Member
Looks like a blob of glue sticking the capacitor to the transformer.
Just a word of warning.
These things are quite hazardous to work on. There is 350v DC around this part of the circuit when powered. There could be a residual charge some-time after switching off.
Frank.
 

DistortionNat

Active Member
Yeah not the blob of glue, the yellow wrap around the transformer coil looks kind of melted. I guess it gets hot so maybe just normal.
 

spyder viewer

Well-known Member
Transformers get warm and thats just protective tape to prevent the windins from being damaged. As it's a switched mode power supply it will almost certainly be a custom transformer so hard to source a replacement. Pray it's just the cap!
 

spyder viewer

Well-known Member
For what it's worth, that's a polycarbonate cap which don't rate highly in the longevity stakes.
 

DistortionNat

Active Member
Ok so Ive taken out the blown cap and I have no idea what type it is or anything.
Anyone got any ideas?
 

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spyder viewer

Well-known Member
If it is agreed that 250 is the voltage rating, then definitely not!
 

DistortionNat

Active Member
I ordered that cap that you suggested, soldered it in today. Bingo! It works, my sub works and you saved me I would have thought around £80.
Thankyou!!
 

keithwarr

Novice Member
hi i had the same problem and followed you and soldered in the same part but light comes on but no sound does it make a difference which way round it goes in

regards keith
 

DistortionNat

Active Member
Hmm not sure. If the light comes then I would have thought it was the right way round. I can't comment really because I don't know why you would have no sound. Mine just worked.
 

keithwarr

Novice Member
Hmm not sure. If the light comes then I would have thought it was the right way round. I can't comment really because I don't know why you would have no sound. Mine just worked.
opps dropped a b*llock the part that has burnt out is the small black component th502 i soldered in the part you have replaced the standbye light comes on but my dad in law says he gets no sound what is the replacement for th502
regards keith
 

spyder viewer

Well-known Member
We aren't the Kef service department but our members will help all we can. The board markings mean little to me. Do you have a photo? Why do you think this is the problem?

Polarised components are usually marked accordingly, ether with + or a solid line with a broken line along side.

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