Kef PSW2000 Sub schematic required

[AKN]

Originally posted by Roar Malmin
Hi guys,

The KEF sub amps has some serious built-in problems. I will address them later next week. Looking at the schematics will not help much in this context.

Regards
Roar

I'm curious and restless…

[mxp3000]

Hello Everyone,

Can anyone help me obtain a KEF PSW 2000 schematic? Any help would be greatly appreciated. I am a new user so I cannot send emails yet.

Thanks again in advance.

[blackstar]

Hi,

I also need a copy of the PSW2000 service manual - I would appreciate it if someone could send me a copy at diyaudio@blackstarrepairs.co.uk

Thanks,
Lionel

[blackstar]

Thanks for the quick e-mails (Zak and Anders) - the manual will be very useful.

Thank you again,
Lionel.

[Roar Malmin]

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

[nigel_feltham]

I would also like a copy of the service manual for the Kef PSW2000 sub. I've just joined so cannot accept a PM but you can email it to nigel_feltham@adp.com

Thanks,
Nigel

[cov.]

Hi everyone

Now I have to start my adventure with psw2000 because is gone
I have been ordered new caps.
Please could someone send to me one copy of schematic for this sub? Will be really usefull...
My email deja.jacek@gmail.com

Thanks
Jack

[gicapi]

Hi everyone!

The auto power-on feature of my KEF PSW2000 has gone. The subwoofer is always on, the LED is always green.

Can anyone send me a PSW 2000 schematic?
My mail is capasso@na.astro.it

Thanks in advance!

[dorje]

I have been given a KEF PSW1000. It has a low level instability problem manifesting as a rough burbling noise/tone. This is audible when there is no input or on quiet passages in the music.

It gets worse after the amp is on for a period so may be heat related.

Shorting out the line inputs has no effect.


I would be grateful for any help.

Would the PSW2000 manual mentioned last month in this post be useful to me. I would appreciate a copy.

My e:mail is debataiduk@yahoo.co.uk

[dorje]

Just noticed that my last post has incorrect e:mai
it is debtaiduk@yahoo.co.uk

Sorry if this has caused any trouble.