Question about Wharfedale SW150 Subwoofer
After finally finding the circuit diagram for the Wharfedale SW-150 sub woofer, I've managed to identify and fix a fault which has the same symptoms as yours.
The problem was with the largest of the two relays (Relay 1 in the attached photo).
The circuit has two power rectifiers, the first rectifier provides the small current for the system to operate in standby. Relay 1 is normally closed and this turns on the secondary power rectifier that powers the amplification circuit.
Relay 2 (smaller and black) is used to prevent the speaker from popping every time the auto-power switches on/off, it uses a delay to allow the amplifier to stabilize before activating the relay which connects the amplifier to the speaker.
On my system the power LED was lit, but the little click that happened about 2 seconds after power-on, was no longer heard. The little click that was missing is the sound of the smaller relay connecting the speaker. This relay was not activating because the amplification circuit had not been powered.
The larger relay does not need to activate to turn on the amplifier, as it is normally closed, meaning the the default connection state is to provide power to the amplifier. The relay is only used to disconnect the amplifier when the auto-off feature kicks in (or the system over heats). I could test this relay was clicking by connecting pins 1 and 3 on the temperature switch connector.
So the relay was not connecting properly in the closed state. This is what the relay looked like on the inside.
Posted on Sep 02, 2016
There may be an open internal fuse
Posted on Aug 28, 2016
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Posted on Jan 02, 2017
SOURCE: Yamaha YST-SW150 Subwoofer
hi, is it a humming noise ??? check if the connector is plugged in properly,check the earthing, if its a three pin mains plug, if its a two pin, then the CPU SMPShave a proper eathing. let me know
Posted on Jan 12, 2008
SOURCE: Wharfedale Modus One
The tweeters are probably blown, i had the same problem.
You can test this by placing the cable on the dismanteled crossover at the back of the speaker. colour blue/yellow.
No high volume please.
If the tweeter is blown it can be dismanteld with the aid of a screwdriver, horizontally.
Place it between the tweeterbowl and the ring which has the mark wharfedale on it. The tweeter comes loose. On second hand sites you can buy little speakers, like modus one or two's with the same tweeters for a good price and put them on your larger speakers.
This how i repaired 2 of my 4 modus eights.
good luck Danny Mol
Posted on Mar 11, 2008
Hiya, try a different input cable (from amp to sub) if you have make sure that is ok.
Failing that if there is an earth in the plug, try to disconnect that (earth loop) - unlikely but hey electronics.... anything possible :)
If still there with new cable, earth off etc, then the Yamaha could have a problem but find that difficult to swallow...
Let me know if helps, see any other possibilty
Best of luck
Posted on Jul 14, 2009
If your Wharfedale sub is powered, it gets its input from a subwoofer output on the rear of the Sony. At a certain level, your sub is turned on and sounds just fine until the level decreases during quiet passages of music then it turns off. I believe the theory is that this approach prevents start-up "pops" but in practice it is a poor solution. I have had several subs that have acted this way. I don't know of a way to fix this short of eliminating the level-controlled turn-on circuit
Posted on Sep 28, 2012
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