Question about KEF Audio TDM45B Speaker

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We have a KEF TDM45B with the SP2271 amp board and are in need of the schematics. Can you help?

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1 Answer

My kef subwoofer keeps making loud buzzing noise


Either you need new high quality cables,or your amp has output filter capacitor problems.

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Morning I have a set of KEF Q 5 floor standing


I'd suspect a shorting voice coil in the woofer or a loose connection inside that vibrates and presents a wildly varying load.

Disconnect the bi-wiring jumpers and try driving each 'half' separately as a test for tripping the amp.

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The amp on my kef sub woofer amp is making a consent buzzing noise it sounds like a kettle boiling. Help


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)

Now my sub works as good as new, apparently these 3 capacitors can cause all kinds of problems it's a common fault, so if you are handy with a soldering iron, or know someone who is you could save yourself a lot of money by repairing you faulty KEF sub.

p.s. if you have ANY of the KEF PSW subwoofers they all have similar issues, you can find a guide to fixing them at the link above, Frank is a brilliant and very helpful man.

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4 Answers

I have a Kef PSW 2500 that emits a loud buzz when on. I pulled the amp, but I'm not sure if its the speaker or amp. What should I be looking for the speaker outputs from the AMP? How can I tell if its a...


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:-
http://www.eserviceinfo.com/downloadsm/35375/kef_psw2000.html

To replace,
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.

Nov 29, 2009 | KEF Audio PSW 2500 Subwoofer

2 Answers

Cliking / buzzing noise


there is a known problem with the amp board going bad. contact kef america and they should do repair under manufacurer extended warranty. if not the flat rate repair is around 250. if you compain enough they should do fix for free. hope that helps.

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1 Answer

Is there an incompatibility between Onkyo 606 and KEF Wireless?


Sorry this is not a solution.

I am having virtually the same problem and I wanted to find out if you managed to fix the issue?

It seems to be my LCD causing the static noise (even when it is powered down). The static noise goes away when I physically unplug the TV or disconnect the HDMI cable to the amp.

Mark

Mar 23, 2009 | Onkyo TX-SR606 Receiver

1 Answer

I'm looking for a KEF PSW 3000 manual download


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.

Mike

http://www2.kef.com/us/support/warranty

Dec 26, 2008 | KEF Audio PSW 3000 Subwoofer

1 Answer

Kef kit 100 buzzing popping


You have a bad set of Audio output IC's for the sub. There is two of them. TDA7293 REPLACE BOTH!!!
There is 4 on one side of board,and 2 on other "also 1 small one" The the two are for the sub,the other 4 are for the main speakers/surround. They sell on Ebay for $6-10 each or a kit of all 6 for $25. I would have all 6 replaced. It is better to run a matched set.

Sep 05, 2008 | KEF Audio KIT100 System

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