Question about Yamaha YST-MSW10 Computer Speakers

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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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Re: YST-MSW10 quits after about 15 minutes

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

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Re: YST-MSW10 quits after about 15 minutes

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

Posted on Jul 30, 2007

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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.
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