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[Mike Caldwell]

I did, but using an XLR to RCA non-transformer adaptor.  Also can't remember if I checked both channels for sure.  I plan to re-visit this and make a pig tail to make checking more trustworthy.  Should I try 1 with 2 and 1 with 3 to the headphone?  Both must work, right? 
Can I also use the pigtail to measure voltage between 1/3 and 2/3?  They should be the same, right?  2-ish volts each?  Or will that tell me anything?

You don't need a transformer adapter to connect headphones to the XLR. Connect pin 1 to the sleeve of the headphone plug and pin 2 to the tip of the headphone, that will give you the left phone to listen to, then try pin3. With out any program audio listen for the noise you should not hear any, if you do hear the noise it is being produced within the mixer itself.

No need to measure any voltages. It would not be a steady voltage anyway with program audio.

[David Allred]

You don't need a transformer adapter to connect headphones to the XLR.

I was just stating facts.  Thanks for the clarification on the pins and that voltage will be not useful.

[Mac Kerr]

You don't need a transformer adapter to connect headphones to the XLR. Connect pin 1 to the sleeve of the headphone plug and pin 2 to the tip of the headphone, that will give you the left phone to listen to, then try pin3. With out any program audio listen for the noise you should not hear any, if you do hear the noise it is being produced within the mixer itself.

No need to measure any voltages. It would not be a steady voltage anyway with program audio.

Just use a FXLR to TRS adapter. Not only can you listen for noise, but you'll also know if the output is balanced or unbalanced by whether you hear one ear or two.

Mac

[David Allred]

You don't need a transformer adapter to connect headphones to the XLR. Connect pin 1 to the sleeve of the headphone plug and pin 2 to the tip of the headphone, that will give you the left phone to listen to, then try pin3. With out any program audio listen for the noise you should not hear any, if you do hear the noise it is being produced within the mixer itself.

No need to measure any voltages. It would not be a steady voltage anyway with program audio.

As you said I got left then right ear from 2 then 3.  I heard no noise,even with output fader at max.  Same on both outputs.  Using the same xlr cable from that test to the powered speaker.  Same result as before... left channel clean, right channel noisy.  Tried the ground lift switch on the powered speaker...  no effect.  Tried a ground lift adaptor on the power cord to the speaker... No effect.
Whatever  the cause, the unit driven must have power (apparently) to have noise on the left channel.

[Ike Zimbel]

As you said I got left then right ear from 2 then 3.  I heard no noise,even with output fader at max.  Same on both outputs.  Using the same xlr cable from that test to the powered speaker.  Same result as before... left channel clean, right channel noisy.  Tried the ground lift switch on the powered speaker...  no effect.  Tried a ground lift adaptor on the power cord to the speaker... No effect.
Whatever  the cause, the unit driven must have power (apparently) to have noise on the left channel.

If it is just confined to one channel, that rules out the power supply. Try tightening any hardware associated with the jack as well as any loose screws on the chassis / front panel. Fixing the "Pin-1 problem" involves having any noise that the shield picks up being drained off to the chassis (and then to ground). If this "fix" in the design of any piece of gear involves a mechanical connection, like a screw, then the fix goes down the drain when the hardware gets loose. I have seen this many times, in many pieces of gear.

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