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PV700 My Switch mode power supply is blowing the positive switch every time i replace the fet. I need the circuit diagram for this power supply

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No power to the speaker

Power Mode (rear-panel): This switch can be set to either On, Off, Auto. If the switch is in the Off position, the subwoofer will not power up. If the switch is in the On position, it will constantly remain on. If the switch is set to the Auto position, when a signal is present the subwoofer will turn on and will automatically turn off several minutes after a signal is no longer present.

Jun 10, 2014 | Energry Speakers Energy Speakers S8.3...

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KLH ASW8 Powered subwoofer keeps blowing 3A-250V fuses

The transistors at the output stage of the sub amplifier circuit might be shorted so each time you power on, the circuit draws a very high amount of current which causes the fuse to blow. It's definitely a problem with the circuit so using a higher current rated fuse would probably just result in damaging the amp even more. You should ask a qualified electronics technician to take a look at it. I hope you can fix it.

Oct 17, 2012 | KLH ASW8100 Subwoofer

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I have a PSB subwoofer 6i and the fuse keeps blowing every time it is renewed.

I have two in my shop right now. The power supply is to blame with these two. the manuf. has used some type of epoxy to hold down components before wave solder. This is in the high volt side of the switch mode power section right on top of the bias components . This epoxy breaks down and becomes resistive to the components below causing a direct short. There was a company years ago that had this problem with the same epoxy. A real stupid move then and a real stupid move now. If your power board is burned due to this problem your unit may not be able to be serviced. Solution is to change the supply. Of course the supply is 3/4 the cost of a new sub. Another real stupid move.
This opinion was provide by THE GREAT OZ.

Mar 29, 2011 | PSB Image Sub Sonic 6i Subwoofer

2 Answers

I also have an Athena ASP4100 sub woofer which blew the fuse on the circuit board and when I replaced the fuse, it just blew it again. As an electrician, my understanding would be the circuit board has a...

You should look at the circuit board for the power amplifier and check for any leaking or bulged electrolytic capacitors. If this speaker uses the circuit boards made by AMI (such as most JBL and Mission sub woofers around 1999-2001 vintage) they had a lot of problems with this as well as bad modules. Google for the module S53AMI and you will find lots of info if this is what you have in that Athena.

Feb 21, 2011 | Athena AS-P4000 Subwoofer

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I have a cerwin vega subwoofer that keeps blowing the fuse

Take a look at the Voltage selector switch (if one is existing). It may be switched at the wrong position. In that case, I hope that the power supply is not burned out (if it is set at the wrong position).

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Jun 13, 2010 | Cerwin Vega CLSC-12S Subwoofer

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Subwoofer blows internal 1.25A fuse when plugged in.

Any fuse blowing is caused by an overload in either the power section or the amp part. Look arond for burnt or damaged parts first. It could be caused by a shorted transistor, but your best bet is to follow the circuit from the fuse on the PC board.

Feb 18, 2010 | JBL PB10 Subwoofer

3 Answers

My sunfire subwoofer starts making humm noise after a couple minutes while listening music,,, I have to disconnect and connect back, is something that involves equipmenrt adjustment?....thanks

Try plugging the unit into a clean power supply without anything else on it. I had this problem for years and eventually resolved it by moving the system to a different room that has three power circuits - the sub is now on it's own circuit and I don't have the problem anymore.

Nov 12, 2009 | Sunfire True Sub MK II Subwoofer

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Subwoofer blows the internal fuse when receiver is turned on

possible solution - this can be caused by a fault in the receiver unit. the sub has a triac 'high side switch' circuit that can cause the fuse to blow if it doesn't get a good switching signal e.g. if the receiver power supply is not running at the full voltage. check the plug pack wire for damage, check the 12v input area on the receiver board for dry joints, particularly the power input socket. hope this helps.-pj

Dec 11, 2008 | Bose Acoustimass 16 Speaker

2 Answers

Power Light off & speaker not working

I had the same problem. The screws around the perimeter of the back plate must be unscrewed and the plate must be pried off as it is glued to the box. When replacing my fuse, 2A 5x20 GMA, it blew the fuse again. Disconnecting the second circuit board prevented the next fuse from blowing, but now the question is what is wrong with the circuit board? I cannot see any damage or shorts.

Oct 10, 2007 | Kenwood SW-38HT Subwoofer

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Orange light

I have the same speaker and it sounds like its behaving properly.

if you look on the back of the amp, you will find a switch that allows the speaker to automatically switch the speaker on or off based on the level of the audio coming from the tuner that it is attached to. If the switch is set to the auto mode, then it will listen for audio on the line and if the signal level coming into the subwoofer is high enough, the amplifier in the subwoofer will turn on and play. If the signal is not strong or loud enough, then the subwoofer will not turn on. There are two solutions to getting the speaker to work.

1. When you turn on the tuner or audio source that is feeding the Subwoofer speaker, you will need to turn it up loud enough to trigger the circuit in the subwoofer to switch on.

2. Alternatively, you can bypass the automatic circuit and set it to the "ON position all the time. In this position the subwoofer is always ready and waiting and should play any signal that is fed to it regardless of the loudness or volume of sound from the tuner. The switch is located on the back of the speaker cabinet just to the right of the red and black speaker wire connections. It is labeled "AUTO" and the switch positions are labeled ON and OFF.

Hope this helps!

Jul 09, 2007 | Acoustic Research S112PS Subwoofer

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