Kef PSW2000 Sub schematic required

[malcolm2413]

kef psw2000 schematic

i have a kef psw2000 that has stopped producing any sound.
i see from the posts that this is common & would appreciate a schematic .
i also intend to follow the mods suggested in post 15(roar malmin)
& would welcome any other suggestions or tips.
thanks malcolm.

 

[Bartje]

KEF PSW2010 service manual

I'm having the rattling relay for 2nd time now. 1st time sub was sent to KEF/UK, took more than 6 weeks. I like to repair it myself this time.
Could anybody send me the service manaul with schematics to me please? I searched everywhere, this seems the only location to get it .............

I'm a new user, thanks in advance!!

 

[superR]

5th hit on google shows a download on HiFi engine

 

[malcolm2413]

thanks for the kef. sub. schematic

i would like to thank SuperR for his info on downloading a schematic for the kef sub. i now have a printed copy to try & help me to effect repairs.
i would also like to thank the those running the forum & express how pleased i am that i have received such useful info on my first query.
malcolm 2413

 

[Gisli]

Hi I have the same problem with my Kef sub as everyone else. I have a psw 2010 has anyone got a schematic for that or would the psw2000 schematic be helpful anyway?

 

[chaveiro]

Hi,
I will try to address most of the problems with this unit. As you know, the amp is located inside a plastic box. The temp has been measured to be over 80C. The standby on/off function works only on the speaker relay, the amp is always powered, hence the amp is always cooking and shortening the life of the components. Replace C59,60 with same rating. Relocate R 143,144 with the aid of flying leads. Increase wattage from 2W to 5W on R148,149 and R141,142 to lower resistor surface temp. Q18, 19 are to be replaced by BD139,140, and attached to the main heat sink. Drill holes and use screws. Remember mica. C42,43, replace with PP caps. Relay are to be replaced with Omron G5LE1-24, rated at 85C. Replace C54,55 with same type, only 105C. Same goes for C52.
Any questions? Just ask.

Regards
Roar

Hello,

Are you sure about this part numbers? Not for PSW2000 for sure...

I have a PSW2000 that is making loud low frequency random noises in standby with no input.
Any advice on what causes it ?

This seems to be the second common problem after the relay clicking problem that i had also and was fixed under warranty years ago.

 

[chaveiro]

Fixed my PSW 2000...

Replaced All electrolytic capacitors (waiting for the 12000uF).
Replaced 2k2ohm 2W resitors with 5W and leaved the wires long.
Replace and relocated R143 R144 to 9W and fixed them to the main aluminnium block with termal coumpound.
Added heat sinc to Q11 Q13, BD140, BD139 respectively.

Put some silicone to glue resistors to the board because the pcb is very fragile due to been cooking and copper as came detached from it.


Now im thinkink in buying a small -15-0-15V transformer, a rectifier and a relay so i can shutdown the main ampifier via the AF/IN line (auto feature). So i got a true standby.

 

[miborebbe]

scematics for the kef

hello

I would like the scematics for the kef PSW 2000.
please send to michiel.rebecca@gmail.com

thanks

 

[samolet]

check e-mail

 

[yangmanyuen]

Hello,
Would appreciate if I can have a copy of PSW2000 schematic to yangmanyuen@gmail.com
Thanks

 

[federicobatarse]

Psw2000 erratas

Hello.. Everyone.. It seem to me that the service manual and schematic diagram do not correspond to my hardware...

A) volumen control sees to be dual ( a and b side ) 6 terminals on the diagram .. But the hardware only have 3 terminals.. It is not dual..

I have many more like this..

Please advice

 

[ijaffer]

PSW2000 - cooking solution

This is great - thanks roar. I opened up sub today and saw that Q18 had been fried, hence I am going to follow all your instructions below. I was just wondering if you could clarify the following:

1. "Relocate R 143,144 with the aid of flying leads." - does this mean that I should have these attached to wires which connect to the PCB. If so, does the component just hang loose, or should I attatch it to the heatsink?

2. "Replace C54,55 with same type, only 105C" - not sure I understand this? Please could you add some more detail.

3. Could you also tell me the specs for the R148 and R149, as they do not appear in the parts list I got with the schematic, although they were on the PCB (hmm!)

Many thanks.
Imran

Hi,
I will try to address most of the problems with this unit. As you know, the amp is located inside a plastic box. The temp has been measured to be over 80C. The standby on/off function works only on the speaker relay, the amp is always powered, hence the amp is always cooking and shortening the life of the components. Replace C59,60 with same rating. Relocate R 143,144 with the aid of flying leads. Increase wattage from 2W to 5W on R148,149 and R141,142 to lower resistor surface temp. Q18, 19 are to be replaced by BD139,140, and attached to the main heat sink. Drill holes and use screws. Remember mica. C42,43, replace with PP caps. Relay are to be replaced with Omron G5LE1-24, rated at 85C. Replace C54,55 with same type, only 105C. Same goes for C52.
Any questions? Just ask.

Regards
Roar

 

[bernhix]

need the schematic

Hi,

Could someone share the schematic with me. I had tried the links given on the previous post but didn't have success. Please sent it to my email bernhix@gmail.com

 

[dannypd]

Hi,

Could I also get the schematic as my subwoofer has died :-( (tried the web link but its not valid anymore)
Please send to danny.denaro@virgin.net

Thanks
Dan

 

[dannypd]

Actually got a schematic, & repaired my Kef.
Basically like others have found my relay on the output was chattering, so I replaced C52 & the relay and its all fixed now

 

[malnor]

schematic

Could I also get the schematic as my subwoofer has died :-( (tried the web link but its not valid anymore)
Please send to malnor@ofir.dk

 

[dudaindc]

http://yaqin.slickpepper.org.uk/wp-content/uploads/2010/04/KEF_PSW1000_service_manual.pdf
http://yaqin.slickpepper.org.uk/wp-content/uploads/2010/04/kef_psw2000_service_manual.pdf
http://yaqin.slickpepper.org.uk/wp-content/uploads/2010/04/kef_psw2010_sm.pdf

 

[MIB]

After reading several topics on these subs I have tried to repair my PSW-2010. I replaced the power caps, C52, relocated R143 and 144, and checked several other components.

Still, after playing normally for a few minutes it gives a load bang. To me it sounds as if something suddenly short circuits and sends power to the speaker terminals on top of the normal signal.

Can anybody give me advice on what components to check first?

Rob

 

[frank1]

KEF sub faults

After reading several topics on these subs I have tried to repair my PSW-2010. I replaced the power caps, C52, relocated R143 and 144, and checked several other components.

Still, after playing normally for a few minutes it gives a load bang. To me it sounds as if something suddenly short circuits and sends power to the speaker terminals on top of the normal signal.

Can anybody give me advice on what components to check first?

Rob

This is quite a common problem and there are two main causes.

1. Change C55, C56 near the 15v regulators. Failure of these cause the regulators to oscillate or intermittently have no output.

2. If Q11 and Q13 are small transistors on the PCB, change them. You will need 1x MPSA06, 1x MPSA56. Kef did a mod to replace these with BD139 and BD140 mounted on the heat-sink.

More info here:
Uncategorized | Kef Repairs

 

[MIB]

Thanks for the info on the caps and transistors. These are indeed components I did not touch yet.

After I've received them I will get the soldering iron out to give it another try.