Question about KEF Audio 30B Speaker
Looking for the fuse holder for the back block. ANy ideas where I could find, KEF was worthless a couple of years ago.
Go here and find a nice substitute. Many to choose from and it may be better to purchase a pair of them rather than have mis-matched ones. They should be inexpensive enough for you, as low as $2 up to $480. You just need the size of the mounting hole to find a replacement though.
Posted on Nov 21, 2008
Try this website for KEF. They have all the manual downloads and I fixed my circuit board from calling them and asking for advice for free. The number or email to get a reply is here. Happy Holidays.
Posted on Dec 27, 2008
Have just repaired a similar problem with a KEF 2500 - relay was chattering at 50 Hz rate, buzz in speaker output.
Problem was caused by overheated / dried out Electrolytic filter cap (C52 - 47uF 63V) on the relay coil supply feed.
The overheating is caused by adjacent power supply dropping resistors which run very hot due poor design of power supply.
A service manual for a similar model is available at following link, refer to power supply section:-
1) remove chassis from speaker cabinet (8 screws), disconnect red/black speaker wires from main PCB spade connectors.
2) Remove 4 screws attaching main pcb heatsink assembly from face panel - lift assembly from faceplate (a bit messy , much heartsink compound between mounting faces)
3) unplug the AC 3 pin connections adjacent to the large capacitors and the 3pin connector on end of pcb (near C52), then roll assembly over the top of the audio sub-board to access underside of pcb.
4) solder connections to C52 is accessible at edge of board without further dis-assembly.
Take extreme care replacing C52, as the circuit board is of poor quality, (usual domestic electronics quality) being single sided copper without plated through holes.
The board is already heat damaged by heat buildup from power supply resistors, so the track will most likely lift and crack when disturbed- to counter this problem link the +ve capacitor pigtail to an adjacent solder pad on the same track.
Assembly is reverse of above, take care to preserve/ensure minimum disturbance of heatsink compound.
Posted on Apr 28, 2010
SOURCE: My Kef Subwoofer model PSW
First of all you need the service manual for the same. That i have with me. If you can sent your email id through fixya will sent the same to you. Just read the service manual and watch the circuit diagrams. There are different voltage measurement points.You have to check the power supply first. It will be very easy to both of us if you also have the service manual. if so i can assist you in the Wright way. It is not possible to set the service manual through fixya because its a large pdf file.
Posted on Jul 16, 2011
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