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Kef PSW2010 Subwoofer common problem DIY repair

My Kef PSW 2010 Sub Woofer is suffering from the common relay trill noise problem that happens when it is left running on standby mode. I am an electronics engineer, so I'm just looking for basic advice on what is likley to have gone. Some user groups state cirtain capacitors and other say the relay that it is the activation relay. Do you have a maintanence manual or circuit diagram for this ? Thank you Mino

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The relay buzzing fault is caused by a faulty electrolytic capacitor.
You need 47uF 100v 105C radial.
C52 on the corner of the board near some power resistors.

Posted on Aug 11, 2010

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  • Frank Johnson Sep 12, 2010

    More information on my Kef subwoofer repair site.

  • lofpat Oct 06, 2010

    Perfect advice , changed the C52 capacitor yesterday and the issue has been solved, I guess it's better to switch off the subwoofer next time instead of in AUTO mode , altough the LED switches then to RED still all the components in the PSU are running on full power which in the end will burn the device....

    I saw that the back of the PCB is quite dark already which indicates that a lot of heat has been on the PCB , any other suggestions to change other components on the PCB to avoid overheating ??

    Thanks, Patrick

  • Frank Johnson Dec 13, 2010

    There are some modifications on the link above.
    Easiest thing to do is to space C52 off the board and bend away from the hot resistors.
    Also use a good quality 105C rated capacitor.

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technical114_47.jpg

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Ok so no guarantees this will work, but it did for me and I knows it's very late but hopefully it will help someone else with a similar problem.

I had the same problem and as clmrt5000 said a very long time ago there could be an issue with a ground loop, although this is likely to give a high pitched buzzing sound.

This can easily be fixed by adding a switch to disconnect the mains earth from the back plate, or you can just unscrew the earth and tape it up, this fixed my ground loop, (some models already have a ground lift switch)

As for the "boiling" sound I also got a saw tooth wave sound (like a strange squeak or beep that changed frequency) this is caused by faulty components, and thanks to Frank Johnson (http://lug.demon.co.uk/kefrepair/?p=60) who suggested that you can simply and easily replace 3 capacitors on the main amplifier board (c58 - 47uF 63v or 100v) + (c52 & c53 - 220uF 25v) but stand them away from the board on the length of the capacitor leads to prevent them from absorbing heat from surrounding hot components (with heat shrink tubing to prevent shorting)

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A service manual for a similar model is available at following link, refer to power supply section:-
http://www.eserviceinfo.com/downloadsm/35375/kef_psw2000.html

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Assembly is reverse of above, take care to preserve/ensure minimum disturbance of heatsink compound.

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