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jtf2

ultra sub no power

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hello all.i noticed today no music,so i started troubleshooting.

usually when turning pod on or off there is a little noise from the speakers,nothing now.

i touched the sub itself and it was not warm at all-usually is

i checked all connections-all goos there

took the panel off sub checked the fuse,it looks fine

nothing anywhere looks to be melted,broken etc.

any help appreciated with this problem

thanks

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Could you explain what equipment you are using? Maybe I can help you troubleshoot the problem.

It could be a lot of things. Have you replaced the signal cable? Is the reciever or PC set to have a sub? Please be more specific and maybe we can help.

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I have the exact same problem with one of my two ultra sets.

I noticed the problem yesterday when I went to turn the system on.

When I press on the Pod power button, nothing happen. I opened the back panel of the sub from both set of Ultra subs, swapped the fuse between the set that is ok and the one that's not, and the fuse is not the problem.

I then swapped one of the 3 supply modules, and it is not the problem. I believe the problem may be due to the main supply block.

The sub is not hot, no burned part, no noticeable problem with any of the components.

But, I will keep swapping module between the two systems until I find the exact module that 's causing the problem, and from there I can locate the exact component causing the problem.

I'll keep you updated on my findings.

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I have found the root cause of the problem.The relay (part number NAIS LK1aF-24V, color black, right on top of the main power module) that turns the system on is no longer working.

If I short the COM and the ON pins of the relay, then the subpowered on fine.

I then went ahead and replaced the part with the equivalent, and voila!.

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I'm having the exact same problem, and I looked at the relay part you described, and it seems to be burned or something. The insulation surrounding it is brown in certain spots. Could you elaborate as to what you mean by the "COM" and "ON" pins, so that I could test and see if that is my issue. Thanks

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