DerEber
Well-known member
Dear friends,
I have an A&H here in my studio and yesterday my Aux sends 1 and 2 stopped working and I had no clue why.
I suddenly could not get output from Aux 1&2. They are also used for a record send to the internal USB-Soundcard.
My only Idea at the first moment was that I was so to say a victim of a some production flawes and that I have to check If I still have warranty on this and that I need to find the bill. Leaving the unpleasant task to send it back and have no mixer for a while.
So today I connected my very old Aksi S20 sampler to the Aux 3 and after a short time I recognised electonic smell.
That was very unexpected. I quickly checked the mono adapter for faults and a measurement of the input of the sampler.
30k, so no short anywere.
I now recognised that leaving the sampler unconected there is an AC Voltage of 80V between the Ground of the Sampler and the Ground of the mixer.
Seems like to be a parasitic build up through the Sampler PS. Tapping both Groungs with my fingers reduces the Voltage to 12 V.
So not much current in the game.
Now I try to figure out whats going on and leaving the question if thats still a warranty case or I have some other problems with my Akai.
I think the mixer has balanced Sends, but still even shorting the terminals should not fry the outputs.
Also the parasitic Voltage build up due to the Sampler-PS sould not be such a problem.
But I have no expirience if this is exeptional high or seems like a PS fault.
I once measured 50 Volt between my PC and the external USB-HD. Still running.
What do you think?
Best case for me is that A&H already knows that they had a flaw in production I get a new mixer and thats it.
Worst case. I have to pay for the repair and continue breaking mixers with my sampler.
best Greetings,
Stephan
I have an A&H here in my studio and yesterday my Aux sends 1 and 2 stopped working and I had no clue why.
I suddenly could not get output from Aux 1&2. They are also used for a record send to the internal USB-Soundcard.
My only Idea at the first moment was that I was so to say a victim of a some production flawes and that I have to check If I still have warranty on this and that I need to find the bill. Leaving the unpleasant task to send it back and have no mixer for a while.
So today I connected my very old Aksi S20 sampler to the Aux 3 and after a short time I recognised electonic smell.
That was very unexpected. I quickly checked the mono adapter for faults and a measurement of the input of the sampler.
30k, so no short anywere.
I now recognised that leaving the sampler unconected there is an AC Voltage of 80V between the Ground of the Sampler and the Ground of the mixer.
Seems like to be a parasitic build up through the Sampler PS. Tapping both Groungs with my fingers reduces the Voltage to 12 V.
So not much current in the game.
Now I try to figure out whats going on and leaving the question if thats still a warranty case or I have some other problems with my Akai.
I think the mixer has balanced Sends, but still even shorting the terminals should not fry the outputs.
Also the parasitic Voltage build up due to the Sampler-PS sould not be such a problem.
But I have no expirience if this is exeptional high or seems like a PS fault.
I once measured 50 Volt between my PC and the external USB-HD. Still running.
What do you think?
Best case for me is that A&H already knows that they had a flaw in production I get a new mixer and thats it.
Worst case. I have to pay for the repair and continue breaking mixers with my sampler.
best Greetings,
Stephan
