Small Electric Shocks from Back of MPC

JamesJeffery wrote:I've been noticing some small electric shocks from the back of my MPC recently. I thought at first it maybe the jacks I'm using as I noticed the first one when I was touching those, but just I had my hand resting at the back near the volume button whilst I pulled a lead out, as I pulled the lead out I felt another shock, but it was from the point my hand was resting, not the lead.

It's not a static shock, it feels like a very small electric shock. Still enough me make me shout "you **** bastard mpc" when it happens lol!

The lead I was messing with is plugged into my laptops line out. It's a phono lead, with two 1/4" jacks connected so it can go into the MP.

I'm to nervous to **** about any more behind the MPC incase it's a fault ground inside the MPC. I've turned it off now.

I did have the MPC open to swap some buttons around as my "mode" button was ****. I only took the casing off though.

Really not sure what's going on. Any input from others who've had similar issues?

Edit. I also have the output going into a Focusrite soundcard. I've just noticed the same shock when plugging an XLR into the Focusrite that's not connected to the MPC. I recall also feeling a shock when messing with the back of my Pioneer mixer that's hooked to some CDJ's ... also connected to the Focusrite. I wonder if there is some power coming from the Focusrite. I don't have any phantom power enabled on the Focusrite though.

I wonder if that's the cause of all these shocks.

atestarr wrote:The focusrite is getting power from the mains (at least mine is). You should check if everything in your chain is properly grounded with a three prong plug and your outlet itself is grounded. I have a guitar amp from the sixties that is not grounded and I get shocked every time I touch my aluminum laptop.

mr_debauch wrote:

sounds like bad grounding

mr_debauch wrote:

atestarr wrote:The focusrite is getting power from the mains (at least mine is). You should check if everything in your chain is properly grounded with a three prong plug and your outlet itself is grounded. I have a guitar amp from the sixties that is not grounded and I get shocked every time I touch my aluminum laptop.

+1


sounds like bad grounding... this is most noticeable if you are in a basement with cement floors especially..

as for the old 60's amp, I did a mod (which is actually quite popular) to an old 60's amp head.. replace the power cable with a 3 prong cable and put the ground lead to the chasis. Helps with noise too.

Clint wrote:Did I miss the part where James said which MPC he was talking about here?

mr_debauch wrote:

atestarr wrote:as for the old 60's amp, I did a mod (which is actually quite popular) to an old 60's amp head.. replace the power cable with a 3 prong cable and put the ground lead to the chasis. Helps with noise too.