Question about Yamaha YST-MS28 Computer Speakers

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YST-MS28 The plug that connects the right-hand control satellite to the subwoofer has a broken pin, so the system will not turn on. Can this be repaired / replaced?

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SOURCE: Yamaha YST-MSW10 subwoofer quits after about 10 minutes

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.

Posted on Nov 03, 2007

  • 190 Answers

SOURCE: SEVICE MANUAL YST MS28 COMECTION

here the link in pdf

need adobe reader to see manual

Posted on Mar 19, 2009

WhiteFox4
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SOURCE: I need the electronic diagram for yamaha yst-ms28

unfortunately there is no such diagram for the speaker. is there a more detailed problem you can bring up and I could try to help you with it?

Posted on Mar 01, 2010

FeaolPlay
  • 71 Answers

SOURCE: Yamaha YST M15 speakers with a Yamaha YST-MSW10

The control panel within the speaker unit may well be dead. Does turning the volume knob produce any static noises or nothing at all? If static is produced, you can clean it with some electrical contact cleaner sprays but if nothing at all, a dead capacitor or capacitors may well be the cause.

Capacitors can be replaced but require the use of a soldering iron and if you are not proficient in using one, the cost of repair may well exceed that of replacing them.

Posted on Dec 03, 2010

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I obtained a pair of Yamaha YST MS50 speakers with no subwoofer. Can they be adapted to use a different sub, such as the inexpensive Yamaha YST MSW5? The clear problem is in different cabling.


If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Search the site by type in the "brand name" to your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

May 03, 2016 | Yamaha YST-MS50 Computer Speakers

1 Answer

How do i connect a set of Harmon Karden HK695-01 speakers to a Macbook Pro Mid 2010


HI Marc
Follow the steps below
Step 1:
Connect the green connector from the subwoofer into the headphone jack on the laptop, the black connector is not used, leave the rubber cap on the black connector to prevent static from the pin grounding on the system.
Step 2:
Plug the orange connector from the right/control satellite into the orange jack on the subwoofer.
Step 3:
Plug the brown connector from the left satellite into the brown jack on the subwoofer.
Step 4:
Plug the AC plug of the HK 965 into the wall outlet
Step 5:
Turn on the speaker set and adjust the volume accordingly.
PS: Do not Forget to adjust the Laptop volume also to minimize Distortion. Enjoy!

Jun 04, 2015 | Harmon Kardon Hk695 - 01 Audio System...

1 Answer

Is there a way to use the Altec Lansing VS4121 Subwoofer as a stand alone?


Normally these low end systems components that depend on each other and cannot be interchangeable from other system. So if one of the components (sub woofer or right control satellite speaker) breaks or gets lost the whole system is unusable...
I was in the same situation. Got a sub woofer from VS4121 without original satellite speakers. I acquired satellite speakers from Altec Lansing 251 which used same connectors but the internal wiring was different and incompatible out of the box. Speakers are also glued together so it is impossible to open without damaging it. Not to mention there is no service documentation anywhere..
But if you like electronics you can try to make something based on the information bellow:
Altec Lansing VS4121 connector pinout
If you take the male connector (from right satellite speaker) and look at the pins and number them first row from left to right pins 1-3, second row pins 4-7, the bottom row pins 8-9 and the circle enclosure as 0
0 - Ground
1 - Speaker Right
2 - Treble (seems just like voltage control but may need to be confirmed: Min=0V; Max=voltage from Volume control Pin 9)
3 - Head Set Right
4 - Bass signal (not sure what the exact original design is as I have not opened the speaker) But seems like they use 50K potentiometer and some sort of RC low pass filter configuration. When potentiometer is set to Min it is shorted with ground. When set to Max it is taking signal from Right and Left Head Set (pins 3 and 5) combined through some larger resistors and low pass filter.
5 - Head Set Left
6 - Ground for Head set (grounds 0 and 6 seems to be connected in the subwofer but within the right satelite speaker they seem to be isolated with separate leads to sub)
7 - Power ON/OFF. When OFF or head set jack plugged = 0V; When ON and head set jack unplugged = 5V
8 - 5V Power in
9 - Volume (min=0V; max=5V). It seems they use 50K potentiometer but probably anything >10k should work.
At minimum for standalone sub woofer you will need to implement:
- Power On.Off (switch between pins 8,7)
- Volume control (50k potentiometer (probably anything beteen 10k and 50k will do)between pin 7 and 0 with variable output to pin 9
- Bass control - join two resistors R (I used 7k) and lets call this join point A. Attach other ends of the resistors to pins 3 and 5 respectively. Attach 50k potentiometer (I used 10k) between point A and ground 0. Attach Variable pin of the potentiometer to pin 4 (Bass input signal). Attach capacitor C between Pin 4 and Ground pin 0 (I used Electrolytic 1uF with negative end to ground) . Resistor R and capacitor C should make simple passive low pass filter (Google for formula) that should bypass anf frequency higher than 80-120Hz to ground and feed frequencies lower than 80-120Hz to pin 4.
PS: I managed to hack 251 control satellite speaker to somewhat work with VS 4121 Subwoofer but that is another subject. All electronic parts were salvaged from old broken TV so total cost was $0 but took several days of tinkering for speakers that I could buy used for $10-20 :)

Jun 25, 2012 | Altec Lansing VS4121 Speaker

1 Answer

I need the electronic diagram for yamaha yst-ms28 computer speaker


unfortunately there is no such diagram for the speaker. is there a more detailed problem you can bring up and I could try to help you with it?

Mar 01, 2010 | Yamaha YST-MS28 Computer Speakers

1 Answer

Yamaha YST-MS50...how does it work ??


I have a YST-MS30 myself. Judging by Yamaha's site, the MS50 looks like it's built pretty much the same way. The subwoofer by itself is pretty useless. The power switch and volume controls are built into the right satellite speaker. There is a level control for the subwoofer, but overall system volume is controlled by the satellite speaker. You also need the power supply (15 volts, 1.2 amps for the MS30, but probably different ratings for the MS50 with its higher power).

Actually, it would be possible to open the subwoofer and puzzle out which pins in the connector you would need to jumper together to turn it on, and you might be able to find a suitable power supply. But it seems like more trouble than it's worth. Complete new system with comparable specs are around $100 from online vendors.

May 02, 2009 | Computers & Internet

3 Answers

Need wiring and 9pin connector diagram


Dell (Altec Lansing) A425 Subwoofer Pinouts

This is a standard female DB-9 serial port.
Here are the pinouts.

Pin 1 = Left Speaker Out +

Pin 2 = Left Speaker Out - (Common Ground)

Pin 3 = Left Line In +

Pin 4 = Right Line In +

Pin 5 = Left/Right line In - (Common Ground)

Pin 6 = Right Speaker Out +

Pin 7 = Right Speaker Out - (Common Ground)

Pin 8 = Power A

Pin 9 = Power B

Jumper (short) Power A to B to turn on.
If you want a volume control you need to put one on the inputs. You will buy buy a stereo volume control or potentiometer.
Here is some info on how to do this.
http://g4tv.com/screensavers/features/43665/Pump-Up-The-Volume.html

Cheers!

Mar 27, 2008 | Altec Lansing ADA425 3-piece 30-watt...

1 Answer

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

4 Answers

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

Aug 07, 2007 | Yamaha YST-MSW10 Computer Speakers

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