Question about Yamaha YST-MSW10 Computer Speakers

2 Answers

YST-MSW10 quits after about 15 minutes

My YST-MSW10 subwoofer connected with two YST-M20DSP speakers to my G5 PowerMac suddenly quits after about 15 minutes. The speakers keep on working fine. When switching it off and on again it works for another 15 minutes, etc. Can somebody tell me what is the cause of this?

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  • Ido Harmens
    Ido Harmens Jul 30, 2007

    Thanks, but unfortunately it keeps on quitting every quarter, no matter how loud the sound has been set.
    The little red light on the subwoofer weakens and I have to switch it off and on again or unplug and plug in again the mini jack cord from the right YST-M20DSP speaker and it will work for the next quarter.
    Is it possible to replace the fuse?
    Maybe it's the Auto Power Off function?

  • Ido Harmens
    Ido Harmens Jul 30, 2007

    Hight cut low or high, volume low or high, against or clear of the wall, upside down... no result. By the way, in case of overheating it seems not logical it will work fine for the next quarter after switching it off and on again.
    I give up. Thanks for your helpful suggestions anyway!

  • Ido Harmens
    Ido Harmens Jul 31, 2007

    Still wondering... like I said before, I'm sure it's no case of overheating, but I think the subwoofer automatically switches itself off after 10 minutes. Question is why, a too weak input signal maybe? When I unplug and plug in the mini jack cord it works fine for the next 10 minutes. Any more suggestions???

  • ewh410 Feb 23, 2009

    I have the same problem. The sub cuts out after about 10 minutes. I am able to get it come back on by raising the volume on my satellite speakers, but my problem is that raising it to the "sub-on" threshold is way too loud for my household and family. It would be great to be able to disable this.

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As far as I can tell, this unit does not have a breaker or anything that would "trip" and be reset by powering off and on. It does have a fuse, which can blow (I replaced mine once) but if the fuse blows, you'll get no power until the fuse is replaced. Spidi, is your computer connected to your subwoofer's line 1 in connection or line 2 in connection? If line 2, that would explain the problem because the auto-off circuit only monitors line 1 in. If there is no signal on the line 1 input, it will power off every 15 minutes. If you are connected via line 1 in, the subwoofer should stay on as long as the volume is fairly loud. That's my problem. At low volume levels, the unit will auto-off even though I'm hearing plenty of bass through the sub. Drives me nuts, but I haven't found a way to disable the auto-off feature. Schematics anyone?

Posted on Nov 07, 2007

  • Les Ferch Nov 10, 2007

    Correction to my previous post... I retested and came to the conclusion that it does not matter if you use the Line 1 in or Line 2 in connections. My earlier tests were flawed. On my YST-MSW10, the auto-on/off feature works fine if the input signal is high enough. The original post stated "it keeps on quitting every quarter, no matter how loud the sound has been set". It's not clear if this is referring to the input level to the subwoofer or the output level control on the subwoofer. The latter does not matter but if the input level to the sub is not strong enough it's going to power off. Simple test... turn off your audio equipment, turn on the sub and let it sit long enough to auto power-off. Now turn on your audio equipment and increase the volume until the sub turns on. If the sub never turns on, the auto-on circuit is broken. If it does turn on (and I suspect it will) leave the music playing at the same or higher level (slightly higher would be good idea) and see if the sub ever turns itself off. It shouldn't. Now you have the threshold for your equipment. Depending on your equipment, there may be a level adjustment for the sub-out (or whatever you connected to). If so, crank that up and adjust the level down on the sub itself. If you have no such adjustments, then I'm afraid you'll need to get a different sub that can stay on all the time.

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Sounds like a fuse is getting overheated and tripped or to loud, check your volume settings again.

Posted on Jul 30, 2007

  • scott gregg
    scott gregg Jul 30, 2007

    there is no way for you to change a fuse, it could be overheating, is it clear of all the walls and such, also it could be the high cut switch. the middle switch on the front.change to low or high and try it.

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Yamaha YST-MSW10 subwoofer quits after about 10 minutes


This problem can be solved by either of the following:
1/ Modify the PCBA to prevent the auto shut off feature from working. This is done by adding a 20k ohm resistor across pins 1 & 2 on the timer IC6. This resistor will prevent the timer from turning off the amp. To do this, unplug the amp. Remove the 8 screws on the perimeter of the rear of the amp. Carefully remove the rear plate. Disconnect the speaker wires at the speaker and the front panel connection on the main board. Locate IC6 on the bottom of the main board. Solder a 20k ohm resistor (1/4W) across pins 1 & 2. Pin 1 and Pin 8 are noted on the board. Be sure to insulate the leads of the resistor to prevent contact with the board. See picture. Re-assemble in reverse order.
2/ Some 5.1 channel amps allow independent control of the volume for the subwoofer in their setup. Check your amp to see if you can raise the signal level going to the subwoofer to prevent the amp from shutting off. You can then dial back the volume of the subwoofer using the volume control on the front._436.jpg

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