Question about JBL PSW-D110 Speaker

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No output from d110

I recently purchased a used d110 and am getting no output out of it. Led on front stays red. If i partially remove one of the RCAs i will get a loud hum, but no results otherwise. I have tried all inputs I have available to me with no different results. Any suggestions? The D110 I have has a shorted C6 cap also . I was told that Best buy had repair it before but he did not remember what they did. The C6 cap is NP 4.7uf @100v .Should I use aNP 10uf @100v ?and if it shorts with 100v cap is something else in the circuit that should be changed ? thanks

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  • calman46 Oct 18, 2008

    would increasing the uf value help ? the original value may have been 10uf.

  • calman46 Oct 18, 2008

    Ok I put in a 4.7uf NP 100v cap and the sub now works. In another post it is mention that JBL sent a 10uf NP 100v cap to replace C6. My sub works but has a hum so I put a AC meter across the main PS caps and I'm getting 105AC across one cap the other is fine at 0v ac ,there both about 47vDC. So it would seem that filter cap(s) need replacing also ,is my diagnosis correct ? thanks


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You can use a cap of same or bigger voltage,

Posted on Oct 17, 2008

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  • Ginko
    Ginko Oct 17, 2008

    Try a bigger voltage cap, if the cap keep shorting then it is something else on the circuit. Probably something wrong on the power supply area, since you get an overvoltage.

  • Ginko
    Ginko Oct 18, 2008

    You can put a capacitor with bigger Voltage, you cannot use a capacitor with more capacitance (more uf ). If you put a capacitor with more uf, that will have bigger capacitance, the circuit probably wont work, or it will blow something else when the capacitor discharge. If you use more voltage the circuit will work the same, and the capacitor will be more difficult to blow, the risk doing this, is that the same problem that blew the lower V capacitor, wont blow the new one, and blow something else. For this reason is always better sticking to factory specifications.

  • Ginko
    Ginko Oct 18, 2008

    To be more precise I checked the service manual for your specific model.

    C6 in your circuit is a safety component, that means that it needs exact replacement, as when it is blowing it is saving part of the circuit from blowing.

    You must replace C6 with 4.7uf 100V 80/-20% Electrolytic redial NP, same as the original one.

    See the list of safety components at page 2 of service manual here :PSW-D112/DPS-12

    If no sound or humming noise (probably a fault in the final amp region of the board) persist, then follow testing and troubleshooting diagrams to find the rest of the faulty components.


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Loud hum from a loosened cable is normal as hum usually means there's an ungrounded connection somewhere acting as an antenna and the amp is doing its job to amplify what it thinks is a signal, in this case 60hz stray ac current is being sensed nearby. It's a good sign that you get hum from the sub because that means the amp is alive.

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Are you certain a bass signal is making it into the sub? The complexities of modern AV receivers vary in how you configure them to direct LFE to a sub. Bone up on that end of the chain.

Or, just hang a CD player on the Inputs of the sub and play something with a reassonable amount of Low Frequencies.

>>>> Be advised that this way of testing has NO VOLUME CONTROL because amps without volume controls always operate at maximum gain, relying on your external controls to attentuate it (hence, the loud hum from a loose cable); so choose a track that eases into the loud parts with some quiet parts up front and BE READY TO PAUSE THE PROGRAM AT ANY SIGNS OF STRESS. <<<<

A living sub will produce only muffled rumble in the absence of other speakers producing the higher frequencies which carry the intelligence of the signal. If that works, back to the receiver for settings. If not... sigh.


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Disconnect all inputs to see if that helps. If it goes away start with the signal cables and add in things until it comes back.

Sometimes the reversing the orientation of the AC plug can help with hum. Or it could be something like a loose or high resistance connection internal to the sub. Good luck.

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Hi Chadwik

The fact that you do get hum when you partially remove one of the RCA's would tend to say that the output stages are working ok. Is the hum "solid" and bassy, or distorted?

There are a few issues that these subs have had, mostly to do with capacitors in the power supply failing. If you are up to it, I can talk you through repairs to it.


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