Question about Bose Companion 3 Computer Speakers

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Need schematics or maintenance maual

Chips on main board are not biased properly need schematics in order to fix it.

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Re: Need schematics or maintenance maual - Bose Companion 3 Computer Speakers Computer Speakers

What is the post here? any problem?

Posted on Nov 16, 2007

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I need to know the color code or the resistor's value for r134 on the Creature's pcb. If anybody knows, please respond.

Hi I done a search on Google and found a schematic it might help. Type in. Harman kardon jbl creature schematic photo :::: I done this search on my phone ...good luck

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How to fix NS-PCS20 2.0 computer speakers that hum static?

Humming is usually caused by a bad capacitor on the power supply board. Look at the caps on the board, any that are puffed up, burned or leaking (brown at the base) need replacing. Make sure you get the EXACT same capacitors and pay attention to the orientation so you get them back in properly, if you dpn't you will fry them soon as you apply power to the board.

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Think I fried the lcs 1030 main speaker board. The wrong power supply got connected and now the speaker doesn't work. Is there any way to troubleshoot and possibly fix

If you can get the speakers open, check for blown capacitors or puffy capacitors. If you see any they will need to be replaced with capacitors with the same UF rating and at least the same voltage and make sure you line up the striped line with the striped line of the motherboard. You'll need to be able to undsolder and solder the caps off and on.

If you see big black marks on the board then the board is basically usueless cause it would cost more to fix then the cost of the board itself. Also check for any blown fuses and if there is you would need to replace them with the same rating.

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3 Answers

No sound out left channel I-Trigue 3300 2.1

Hey, I had that same problem and looked over it with my Dad, who's very technically minded. Here's what he found:

** Begin Quote **
We also had no/weak sound on the left channel of the I-Trigue 3300 2.1. Here's what we found (starting where you left off...).

The internal bias for the input pin for the left channel on the M51132L (pin two on the M51132L between the heat sink and the connectors) appears to have failed. It was sitting at an operating point of around 11 volts (should be 5.4V as the others were) and was only capacitor coupled to other nodes (the input at 0V bias and the chips reference on pin 4 at 5.4V) so it wasn't a case of capacitor leakage. Our temporary fix was to hang a 10k resistor between the node on pin 2 (with the failed bias) and the node on pin 4 (a good bias source). The easiest place to hang it was across the cap that connected to those two nodes. That pulled pin 2 far enough from the rail (down to around 9 volts) to allow it to work at the levels we drive it at while we look for a replacement part. The expectation is that with this kludge in place the left channel will distort before the right one will when the drive level is increased however, for the tests so far, the right and left channel now both work equally well.

** End quote **
Hope this helps you!
-David S

Sep 20, 2009 | Creative Labs I-Trigue 2.1 3300 Computer...

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Those speakers I don't believe you can order parts for, you would have to replace it completely.

Just to be sure though cause things do change, it would be best to call Harmon Kardon Customer Service at 516-255-4545

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1 Answer

Dell MMS 5650

you will never find a schematic for any dell part.
you can be the first to make one though.

if you know electronics then the circuit for that is one of the easiest.
having a schematic will not help you fix it.

since your looking at an item that sells for 30 to 70.00 any part in there you order will max that.

I find a signal tracer to be invaluable in troubleshooting these.

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Output board for Altec Lansing ADA995

I had the same problem. One day I heard two pops and the speaker, including the power light, were dead. Neither Dell nor Altec Lansing support them. They're throw-aways, unless you know a genius electronics technician.

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1 Answer

Main amplifier may be blown

if your speakers have a warranty can you return that to the store with the receipt because the store will replace a new for defective product..or you can go to the web site of the brand of your speaker if you intent to buy the main board you can order trough the online shopping.

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