Question about Bose (321GS) System

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Blown in line fuse in the subwoofer box for a Bose speaker

Can;t find the fuse, it is a 4A 125V solder in type. Can suggestions on where I can get one?At work so not sure of model #

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Radio Shack. Ask at the desk, it may be order only part. Parts Express (online) has a great variety as well.

Posted on Dec 26, 2008

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1 Answer

Change main fuse but still not working right


First of all, nothing wrong with the fuse. A fuse is nothing but a short piece of wire with a resistance value. If the unit turns on, fuse is fine. The fact that the headphones you plugged in are working tells you that the music is finding it's way up to that point. You must realize that the speakers themselves have additional circuitry that the headphones don't use. If you could obtain a diagram for the circuitry you might find that a capacitor or a diode or a transistor got "zapped" when the high voltage was applied.
If you have this diagram and you don't know what component is defective, can you post that diagram and I would be glad to help!

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This may not be a fuse. Bose uses devices like this as "speaker protection". If this device is wired to the woofer, that is exactly what it is. For more information, please visit my website at audioserviceclinic.com. Thank you.

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Does bose 701 series ii have a fuse for power subwoofer?


Fuses are used to control the inflow and outflow of electrical current. They are mainly used in speakers in order to protect them from being blown out. This is why there is a specific number of ohms on the instructions that it can handle. I'm sure there is somewhere. There are fuses in all high quality speaker systems. You'd just have to open the back up in order to find it.

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1 Answer

No sound. Receiver shows 'speakers powered off' while it is connected to power. Not sure if it's a problem with the module or the receiver. Any ideas will be appreciated. thanks


This reeks of a blown fuse to me... Is this the first time you have ever plugged in this Set of speakers?
If so, are they under warranty? If they are not, I would suggest Unplugging everything from the mains supply, And opening the box to check the fuse... Short of that, it may be a loose wire in the box as well, I have had both occur with the same result... Hope this helps :D

Nov 23, 2010 | Bose Acoustimass 10 II System

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My left side speaker is not working i suspect fuse blown but where is the fusebox situated on my BOSE 901series III.


There is no fuse in a 901. Have you swapped channels, speakers, bypassed the EQ to ensure it or its pathing has no part in the failure?

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The required fuse is 1.6 A / 125V an is blown, I wen to radio shack and bought a 1.6A/250V and it has blown 2 already, what can I do or check to fix it? This is a Sony Sub-woofer model sa-wmsp1.


Hi,
If power transformer T1 got shorted or its output voltage got shorted for some reason, fuse will blow in Sony SA-WMSP1 active subwoofer.
Check power transformer, D401 bridge rectifiers and IC301 power amplifier out chip. Any of them is bad.
Let me know if you have additional question.
Thanks.

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1 amp 250-volt from radio shack #270-1021

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Have a Bose Acoustimass 15, Would seem the fuse has blown, all other speakers work. Have removed two screws and the two knobs. Found the slider mechanism, and moved it facing up towards me, issue is still...


Of course it's worth it - just unsolder the old fuse and solder a new one in. But first make sure the fuse is really blown. Buy a cheap $10 ohmmeter and check it - a good fuse will make the meter respond, or make the ohmmeter beep. Note that a blown fuse might still make the ohmmeter respond, since other circuits connected to the fuse will affect the reading. So look for zero ohms. If you get like 5 or 10 ohms or more, the fuse is blown. It may not be the fuse, but this is the first step to find out. Best way to check fuses is to unsolder and lift one end, so that you're only reading the fuse.

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JBL will not come on


yes, there's 2 fusen inside near the power supply.

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