Question about Yamaha YST-SW215 Subwoofer

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YST-SW215 Every time I turn the power on, it blows the internal 4a / 125 v fuse. The unit is practically brand new. Any help? Bill

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Do you have the input voltage switch set to 120V 60hz. There is a switch that should change from 120v/60hz to 220v/50hz. In the US this should be on 120v/ 60hz

Posted on Dec 20, 2008

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Well you are on the right course. I suspect you think the problem is in the power supply and it's probably not. I think that what's gone is either a transistor (or more) or an IC amp - if it uses one - on the main power amp stage. Look at the devices on the heat sink. I think that's where you will find your shorted device.

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The main power fuse for most amplifiers is a fast blow, 125 volt fuse for the US and a 250v fuse in countries with 220v. This unit is 125 watt so the main fuse should be 2 amps or so. The correct fuse size is written on the circuit board next to where the internal fuse was located.

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Mackie say this is not a user service part. If the fuse has blown there is probably a fault in the unit being their reasoning. I know for certain they tend to blow for no apparent reason so it is worth giving it a go. They are 5 x 20 Slow or time fuses. 7A for 120V and 4A for 230V

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Not working turns on, no sound, the stand by/on light goes on and I hear the unit amp click on but no sound. I tested the internal fuse for continuity and it was good, however I dont know how to check if...


hi,
first of all remove the speaker and check it, is it faulty or not. connect a battery between the two leads of the speaker .if it is ok then it will produce some cracking sound. check it first.
ok

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1 Answer

Keeps blowing the fuse inside the unit.


When a fuse blows suspect an overload in either the power supply or main amp stage. The most likely cause is some part acting like a piece of wire instead of doing it's job. In the power supply it could be the transformer, voltage regulator, or the rectifier or any diode. In the amp section any semi-conductor on the heat sink.
Check first for burnt or damaged parts. If you have a multimeter any transistor or diode will quickly show up. For when you have the meter on the ohms setting and touch the terminals with the probes, it will show as if you had touched the probes together.

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I have a problem with my yamaha subwoofer yst sw 215 after about 5 minutes of use it gets this continuous bass vibration through the the sound outlet like its stuck on a bass sound any ideas


could be a problem with one of the filters inside or a short circuit... your best bet would be to have someone skilled in electronics look at it, and stop using it as you may permanently damage your speaker.

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