There is unknown noise at +48V situation

[mojave3]

Hi there
At first, sorry for my english. I am living in South korea.
My J99 has big problem.
There is some tick noise at +48V situation.
no cable and microphone problem.

Please listen that.
Is there somebody can help me to fix this problem?

Thanks a lot.

[mojave3]

http://pigibit5.net/?module=file&act=pr ... f5a73f892e

[tpryan]

What was your troubleshooting procedure so far?
How do you know it's +48V related?
Does the pop happen even if no microphone is connected?
Is there a phantom voltage change when the pop occurs?

[mojave3]

There is no pops in no microphone situation with +48v
and No pops at Dynamic microphone. only at condensor microphone.
I keep checking phantom power with my voltage test device, and it constantly shows the voltage is +46.9V. I don't think the voltage is a problem.
I remeber there was a very tiny spark when adjust bias at first test.
I need some help to fix this problem
Thanks a lot.

[tpryan]

What happens if you move the jumper at J3?

What happens if you remove the capacitors at C1, C2, and C3?

[mojave3]

I have done what you said but
nothing has changed. Still noisy.

[tpryan]

We'll need to see it. E-mail rma@seventhcircleaudio.com for return instructions.