Question about Yamaha YST-SW1500 Subwoofer

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Yamaha YST-SW150 subwoofer popping

My Yamaha YST-SW150 subwoofer starting popping randomly. I had not used it for 6 months and now it is too annoying. It sounds like something internal. Is it in the sensing circuit that turns it on? Is there an internal adjustment or fix for this? A circuit diagram would be greatly appreciated.

Emil

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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

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If you wish to get some details; check the site linked here. Pull up older posts.
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I have a YST-SW150 speaker that turns it self off after 7 minutes , turn it back on and it'll go again for 7 minutes, (sounds good those 7 min) music sensor auto on/off is off


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In between the power supply board and the amplifier board are a number of rather fine interconnect wires. One of these is the shutdown/startup control line for the auto on/off function.
In my case the wire had been pinched where they are cable tied together. Causeing the power supply to think there was no music input and should shut down.
rejoing the broken wire rectified the problem.
In my case more than one wire had been damaged.
the shut down line is labled SO on the amplifier board connector.
7_19_2012_1_10_37_pm.jpg

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May somthing happened to one of them the last time you used it and you did not notice, and it might just need some servicing.

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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

Jan 10, 2008 | Yamaha YST-SW150 Speaker

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