Having problems with your Yamaha YST-MSW10 Computer Speakers ?

Yamaha YST-MSW10 subwoofer quits after about 10 minutes

\015 Sreekidu, maybe you could solve this problem:\015\012\015\012My Yamaha YST-MSW10 subwoofer connected with two YST-M20DSP speakers to my Apple PowerMac G5 suddenly quits after about 10 minutes. The speakers keep on working fine. The little red light on the subwoofer weakens and when switching it off and on again or unplug and plug in again the mini jack cord from the right YST-M20DSP speaker it works for another 10 minutes, etc. It's no case of overheating I guess, hight cut/volume high or low makes no difference. It seems if the Auto Power Off function on the subwoofer turns on, but why, the audio signal seems fine.\015\012\015\012Ido, Holland\015

Answers :

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
This speaker has a feature that shuts it down automatically when there is no audio signal present for a period of time. Unfortunately, the threshold is set a bit too high so, if you're listening at low volume the speaker will turn off even if there is signal present.

I found this posting because I was looking for a circuit diagram so I could bypass the auto-off feature on my MSW10.
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