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Bu-120 subwoofer keeps blowing fuses - Infinity BU-120 Subwoofer

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Posted on Jan 02, 2017

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SOURCE: Need Sony Part semiconductor 8-729-119-76

I have the part you are looking for if you still are in need of it. Sweet-sounds Mark

Posted on Mar 20, 2011

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I sent an earlier question regarding a 10 inch KLH sub in that it keeps blowing a fuse. I turn it on, it humms and then the fuse blows. Is there anything I can do to diagnose this problem and fix it?


Fuses only blow like that when a semiconductor device is acting like a piece of wire causing an overload. An ohmmeter on the ohms setting will show any transistor with this condition as a short, just like you had touched the test leads together! Follow where the fuse leads to. And look out for signs of damage too. The most obvious parts to go are the ones that do the work, in the power supply or the main amp device, often an IC.

May 25, 2011 | KLH ASW10-120 Subwoofer

1 Answer

Need Sony Part semiconductor 8-729-119-76 for the Infinity BU-120 Subwoofer


I have the part you are looking for if you still are in need of it. Sweet-sounds Mark

Feb 12, 2011 | Infinity BU-120 Subwoofer

1 Answer

Is there a on of switch and is the green or red light to be on


There is no main AC power switch on the BU series; it's in standby mode whenever it's plugged in.

When playing music normal LED color should be green. After no signal for 10 minutes or so it will turn back to Red (Standby)

Nov 23, 2010 | Infinity BU-120 Subwoofer

1 Answer

My model 765S KLH powered subwoofer keeps blowing fuses (2 amp). Is it fixable and is it worth fixing?


I saw this post. I have the same problem with my 10-100.
http://www.fixya.com/support/t2753393-klh_subwoofer_about_6_yrs_old_keeps

Nov 13, 2010 | KLH ASW10-120 Subwoofer

1 Answer

Subwoofer keeps blowing fuses.


THE AMPLIFIER "IC" MAY BE SHORTED!
IC MAY NEED REPLACED.

Apr 10, 2010 | KLH ASW10-120 Subwoofer

1 Answer

My son and I both own Infinity BU-120 subwoofers, and both exhibit the same problem. Fuse is blown, and the C6 capacitor is blown apart -- literally. I was told to replace that capacitor with a 10mfd,...


Msullivan56 & son,

Yes indeed... We are on luck...

There are circuit board layout drawings...
on my Favorite FREE "manual" site ...
starting on page 20
(SHOWING POLARITY)...

Plz click here...

Infinity BU 120 Service Manual Amplifier subwoofer Bu 120 hts

Hope this helps...

My First "experience" of getting soot embedded in my SAFETY GLASSES... WAS PLACING OF A MODERATE SIZED
"POLAR" filter capacitor in a pretty large RECTIFIER PANEL...

I HAD FOLLOWED the Circuit Drawing ...
(arguably correctly)
as there was very little of it left)) when
POWER WAS RESTORED ... (sort of)

I came out of the EXPERIENCE WITH AN ENDURING
respect for SAFETY GLASSES... looking rather
like a Raccoon (I'm just saying).

Wear them...!!


Carnac the Magnificent

Jul 25, 2017 | Infinity BU-120 Subwoofer

1 Answer

Have a BU2 subwoofer no sound


start by checking for a blown fuse. Sometimes the fuse holder is on the back panel.

Feb 09, 2008 | Infinity BU-120 Subwoofer

2 Answers

Sub woofer keeps blowing fuses


NO dont try a 3 amp fuse.It is made to BLOW if there is a problem. That sub is not worth fixing, JUNK it. There are a lot of problems with it. Such as heating up and melting the board witch could cause fires. Thats what happened to mine. Like I said JUNK it and buy a different one.

Nov 19, 2007 | KLH ASW10-120 Subwoofer

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