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Boston MCS 95 diode repair - Audio Players & Recorders

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How do you repair blown Boston Acoustics Subwoofer MCS Amp?


Most often this unit goes dead because of zener diode ZD3 shorting. It is a 18v zener. replace this and you should be back in business.

Feb 20, 2017 | Boston Acoustics Audio Players & Recorders

2 Answers

Sub woofer not turning on


Is it receiving power? If not that is your answer - could be a blown fuse, bad wire, bad connection, etc.

If power is there and it still does not work then the problem coud be with a bad sub woofer on/off switch, internal fuse, or worse, blown amp from over driving.

Feb 25, 2016 | Boston Acoustics MCS 90 Horizon Series...

1 Answer

Subwoofer not working


There may be an internal fuse that's blown. I'd take it to a repair facility and have them check it. Could also have a bad connection inside. Good luck!

Feb 15, 2014 | Denon DHT-1513BA Home Theater System

1 Answer

MCS 160 Boston Subwoofer ZD3 Zener Diode Value


ZD3 is a 18v zener. Also check the surface mount resistor on the back of the board that is attached to ZD3, I think it is R9. Should be 10 ohms. This resistor sometimes opens when the diode goes short.

Jul 13, 2013 | Audio Players & Recorders

1 Answer

Avr 1513 no signal to subwoofer


Check its speaker connections. Check the speaker using a dry cell. If it is found OK, check the sound settings. If you wish to get more details, check this link.

Mar 22, 2013 | Denon AVR-1513

1 Answer

I also have a fried zd3 on my boston acoustic mcs 95 Sub amp board. Do you know the radio Shack part number you used and did your amp power up? My Sub is not working. No power and no green light but my...


zd3 is a zenna diode, you will need to find the volts that it triggers at, most amps (99%) have a mirror circuit board so all components are dobbled so this will help you find what you need Re: Jeff

Nov 25, 2012 | Radio Communications

3 Answers

Mcs 160 subwoofer no power


I had the same problem with my subwoofer unit. I found the zener diode ZD3 was fried. The pic below shows the diode and its clearly tagged ZD3. You need a multimeter to check this before you order anything. This diode should only transmit power in one direction. Its size and spec is 18v .5w zener diode. (that's 1/2 w) It's very inexpensive and the whole repair took about an hour. This is from a Boston Acoustics subwoofer MCS 160
Ok..the procedure is easy.
1) unplug the unit and bring it to a well lit work area.
2) remove the panel from the back and locate the board that is held to the panel by 4 screws and has the ZD3 diode. The pic below shows the diode at the end of my test lead. Note the direction of this part and reinstall the new one in the same direction. Its a simple de-solder and re-solder project. I elevated the new diode about 1/8 " from the board with a small strip of copper. This acted as a heat sink during the soldering and elevated the part above the board to help it dissipate heat later when in use.
3) re-install the board and plug in all the connections.
4) this worked for me and I'm enjoying my sound system again!..good luck0482b949-8492-43a6-91df-0fb2f0e6888b.jpg

Jul 24, 2012 | Denon Audio Players & Recorders

2 Answers

Zd 3 diode value on boston acoustic soundware xs 5.1 subwoofer


Hello
Did you find the value of ZD3.
I need it too.
I have the same problem, and I take out the ZD3 and the subwoofer works. But I'm not sure that is correct. I think it may be the circuit stand by.

May 27, 2012 | Boston Acoustics SoundWare XS 5.1 Speaker...

1 Answer

MCS 95 SUBWOOFER WON'T POWER ON..REPLACED FUSE WHAT ELSE TO TRY


Concerning the Boston Suwoofer not powering up, I just had the same problem and this is what I did to fix it.

1. Uplug the unit
2. Remove the outer screws and remove the board unit
3. Unplug the board (Power Board) that is connected to the switch and unplug the two connectors that connect to the amp.
4. Remove the 4 screws(on the front panel side not the nuts on the board)
5. Look at the switching diode (labeled #1) directly beside the transistor cooling plate, if the board around this transistor is burnt there is a good chance that the diode is fried. If you do not trust your eye you can measure across the positive and negitave of the diode with your multi-meter (on the diode check setting) and you should read ~.565 and you should read infinity if you swap the leads. If the diode reads ~.667 and you can read this taken across any polarity the switching diode is fried.
6. If the diode is fried go to radio shack
7. Purchase a 1N914-1N4148 Switching Diode. Cost about $1.36.
8. Go home de-solder the fried diode.
9. Solder in the new Diode. ***Pay ATTENTION to put the new diode in the exact way the old one came out!!*** If you do not get the polarity correct the diode will not work properly and your unit will not power up. Also, it is a good idea to leave ~ 1/8" between the diode and the board, this will help disipate heat the cause of the problem to begin with.
10. Place power Board back on the backside of the front panel
11. Install 4 screws(on the front panel side not the nuts on the board)
12. Plug the board (Power Board) that is connected to the switch and plug the two connectors that connect to the amp.
13. Place the panel back onto the subwoofer and secure it with the screws. You can use a screw gun for this just make sure to turn you tourqe level back to ~3 otherwise you could strip out the screw and or the particle board.
14. Plug it in and your rolling.

I hope I am not to late and this works out for you. I just fixed mine tonight.

Nov 01, 2011 | Audio Players & Recorders

1 Answer

How can I take apart my Boston Acoustice MCS 130 speaker. It was dropped and now does not work. I want to look in it and see if I can repair it.


there should be panels or rubber feet with screws underneath. or the speaker part can come off. that would be where the mesh would be or holes for the sound to escape.

Dec 12, 2010 | Boston Acoustics Audio Players & Recorders

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