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No power to my, no disc, power supply, subwoofer, 2 way radio

Celestion S8 Subwoofer (by 3 users)

posted by Oberon on Aug 22, 2006

Hi folks,
My S8 has started humming all the time, with or without the phono lead in, and in all on/off/auto positions. It's been a pretty good sub so far so I'd rather try and fix it than dump it! Could it be a coupling cap or a resistor gone high in the amp? Any help much appreciated!
Oberon

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Comment by Guest, posted on Aug 08, 2008

I have an S8 with the chattering relay issue and we are not alone - looking about a few forums it is a widespread problem.

I got hold of the schematice for a kef psw2000 which is broadly similar and after browsing the diagram and a few forums I plan to replace the main smoothing caps and also c52, which sits after the relat and smooths the full supply voltage, it has a hard life and I suspect the 63v part that is fitted has not lasted.

Comment by Guest, posted on Jan 02, 2008

i have the same problem with mine it seems to be the blue relay chattering , voltages and cappies seem ok, the reason for the chatter is unknown anyone out there got a circuit diagram.

Best Solution

posted on Sep 03, 2006

The Marv

Rank:

Wiz
Rating: 84%, 252 votes

I would check the electroltyc caps in the power supply They general are in the first part of the power supply and there will be two of them . What they do is filter out transformer hum and help stabalize the circuit. I am not saying this is absolutely the problem but the capcitors are relatively inexpensive, Easy to change. And have a habit of going bad after a couple of years in use.

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Solution #2

posted on Mar 07, 2008

shaneuk

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The relay chatter is because its getting AC from the board. I took the relay off the board and tested it with 24VDC it works fine - checking with a multimeter it seems the relay is getting about 20vDC and at the same time 8V AC ! Normally my multimeter wont read AC if its DC and vice versa - very strange! But the question is what is causing the circuit to get AC?

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Solution #3

posted on Feb 24, 2008

Guest

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It's a problem in the grounding of the unit all you need is receptacle adapter that takes away the ground plug on the power cable.

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Solution #4

posted on Nov 13, 2007

Guest

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i too found my subwoofer humming after about 3 years... weird thing is i found the solution to my problem... i turned on my sub, it hummed, i disconect the cable from my tv, IT STOPS!!! i am going to radioshack tomarrow to pick up a device that connects my cable to my tv to stop the interference

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Solution #5

posted on Oct 05, 2007

Guest

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If the sound source is on a different circuit or plug it produces some kind of a loop (dont know the technical name) Go to radio shack and get a ground loop disrupter that goes on the audio cables right before the speaker and it eliminates that hum.

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Solution #6

posted on Nov 02, 2006

Spook

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When you say check the caps what do you mean? I also have a Celestion S8 Sub that is about 3 years old and has just started doing this exact same thing. Celestion say they'll fix it for about £50.

Could you be a bit more specific for those of us that don't know much about electronics :o)

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Celestion S8 Subwoofer (by 3 users)

2 Other Users Have The Same Problem

Comment by Guest, posted on Aug 08, 2008

Comment by Guest, posted on Jan 02, 2008

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