Question about Altec Lansing Multimedia Computer Speakers

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Broken speaker My 6 year old son pulled the speaker with the volume control on it and the wires pulled out. my husband tried to fix it but despite his efforts, none of the speakers will work. is there an alternative way to hook it up so the subwoofer and other speaker will at least work?

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You need to open the subwoofer box and see what's the wire pulled and you need a soldering iron..

Posted on Jan 09, 2014

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The only way is o replace the wires from end to end.. you may have to do some soldering inside the subwoofer and the satellite speakers

Posted on May 13, 2008

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For a 20 year old radio, the volume and balance is almost certainly controlled by a potentiometer that has input into one leg of the fixed resistance, and the other leg (of the fixed resistance) is grounded. The movable center tap is the output to the amplifier - and its position controls the volume to that channel. If the ground leg becomes disconnected (broken wire, or a cold solder joint, or even a break in the resistor within the body of the potentiometer) then instead of "dividing" the volume, it simply provides a slight resistance inline - short answer: It goes full volume.
You can try running the control full range back and forth, and even just the old time "slap it" approach, to see if you get any static or change. If you do, that pretty well confirms the diagnosis. [If not, it just means the break is not close to touching - still almost certainly the right answer though.]
Only fix is going to be disassembly. You then may be able to find the break (and resolder it), and/or replace the volume potentiometer. Note that if you have remote volume/balance control (controls on the steering wheel), then there is some extra wiring that can likewise be involved. jk

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I have a 22 year old Luxman receiver. The left speakers periodically turn off, but seem to recover if I really turn up the receiver volume. I did just reconnect the speaker wires in an attempt to fix the...


To be honest it sounds as though your volume control needs a clean, try to find some switch cleaner (servisol or similar) remove the casing and spray into the volume control from behind the face plate as apposed to from the front. Rotate the volume all the way back and forth several times to clean the tracks, I have used deodorant in the past to achieve the same result but as this will leave a residue, probably not recommended as a permanent fix. Obviously do these actions with the amp switched off, otherwise you will at the very least annoy your neighbours with the loud volume.

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Nov 13, 2007 | Audio Players & Recorders

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After I posted my problem, I browsed a bit further through the other posts and solutions, until I came across the excellent solution of TrickyTrev34 and gave it a try. However, I did not slice the cable, but did it as follows: <p> 1. Switch off power of the sound system on the subwoofer box. Disconnect the Front Right (FR) speaker box (the one with the volume control) from the subwoofer box.<br>
2. Remove the silver coloured metal oval on which the speaker box stands. Now you'll see a small screw at the bottom of the speaker box. remove it.<br> 3. Carefully remove the silver coloured metal protection plate (with all the little holes) from the front of the FR speaker box by wedging it from the top with a flathead screwdriver or other thin blunt object. Now you'll see the speaker and 4 holes with screws inside. Remove screws and speaker box opens up..<br> 4. Inside you should see six wires (Red, Blue, Yellow, White, Green & Black). Carefully cut the GREEN wire only. Insulate the both ends of the GREEN wire with electrical tape or heatshrink or similar.<br>
5. Put the FR speaker box back together in reversed order.<br> 6. Connect FR speaker back to the subwoofer box. Make sure the volume setting on your PC is very low, because when you switch back on the power of the subwoofer, you should be blasting again.<br>
<p> As TrickyTrev34 already mentioned, the only downside of this procedure is that it will disable the volume control on the FR speaker, but who cares, your sound system works again, and you can still control the volume via the PC playback control panel and/or the multi-media keyboard if you have one.<p>Thanks for giving the lead trickytrev34.

Jun 27, 2007 | Altec Lansing Multimedia Computer Speakers

9 Answers

Limited volume on speakers. Worked well previously.


Guys,

In case my nickname does not show, this is treefarmer. I had the same problem and decided to fix it myself over this Christmas. I was successful, and here is what I found.

In my case, the problem lies with the volume control chip ( it has a voltage controlled amplifier, or VCA in it) on the main amplifier board. The voltage which controls the volume for all channels comes from the right front speaker. There is an issue with the I.C., in that it has some abnormal loading (leakage) of the volume control signal at the I.C. pin. You need about 5.2 volts for full volume output, and on my system, I can only get about 1 volt. You can find the IC data sheet (Mitsubishi M51132L) here:

datasheet.html">http://www.datasheetarchive.com/M51132L-datasheet.html

The parts inside the enclosure get quite hot under normal operation, and I would not be surprised if this I.C. has an issue with degradation under high temperature. Regardless of the problem, I managed to get the volume back with one simple fix.

If you can open up the right front speaker, place a 10 kohm resistor in parallel with R1, which should have three orange stripes, and one gold stripe. This fixed mine, but this might only be temporary, depending on how much worse the volume control I.C. becomes.

I did check out the power supply, including transformers and everything else, and they all look fine. It would surprise me if the transformer failed as has been posted in other forums. They should be able to survive higher temperatures than the other electronic components in the box, especially when most of them are consumer grade parts with a max temperature of 70 C. One thing of note is that turning off the right front speaker pretty much shuts off most of the quiescent current draw of the amplifier board. I found that with only the sub cabinet switch on, nothing gets warm. You won't see significant warming of the interior components until you turn on the right front speaker. However, then the inside of the sub enclosure gets pretty hot (too hot in my opinion) just sitting there with all the speakers powered up.

I would recommend at least turning off the Right Front speaker when the computer is powered down. More often if you are not listening to anything. I don't think you need to shut off the sub enclosure to keep things cool, but turning off everything ensures that the amp is not sitting there cooking itself. And, unless Altec has changed the design, I would bet new systems will fail in the same manner.

For what that's worth. Hopefully somebody will find this helpful

TF

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