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The sink is aluminum or copper. Just secure the ground wire to any screw that is nearby, or where you see a scorch mark. If you could read a schematic, you would already know such a simple answer by looking at the board.
E191 code indicates a communication error/fault has occurred between the DC Controller PCB and the HVT unit on the Composite Power Supply.
Check all of the connections for the DC Controller PCB and the Composite Power Supply.
Make sure the wire harness between the DC Controller PCB and the Composite Power Supply is good by performing continuity checks (including cross-checks and checking for a pinched wire to ground for each wire) and visually inspecting it.
Make sure the wall voltage is correct (neutral to ground should be less than 1 volt).
Finally, try replacing the DC Controller PCB and/or the Composite Power Supply.
Link to how to do that- Canon iR2870 Error Codes
On the power line cord the neutral usually has a wider blade. Also the cord MAY have ribs on the side of the neutral conductor. The polarity of this cord is NOT important to the operation... the power supply does NOT care.
If you are asking about the cord that goes from the power supply to the mixer, then we need to talk further. This three wire connector has a ground and two 19 VAC hots. Describing the pins in the triangular pattern would be risky... HOWEVER you can use an ohmeter to find the single ground by looking for near zero ohms on one and only pins of the mixer to a ground on one of the 1/4 inch jacks. The dual 19 VAC power supply is rated at 1.5 Amps (1500ma) for each of the 19 VAC outs.
Note these 19 Volt hots come from either side of a 38 volt centertapped transformer with the centertap to the ground.
replacing the fuses with random values is prolly not a good thing...but one thing to check is a big transistor know as the HOT. This will more than likely be clipped or screwed to a heat sink NEAR the flyback (big transformer, has a wire going into the big glass tube). That causes fuses to blow...If this does not work, let me know.
signs of a short, did any wires touch while you where hooking or un hooking the amp? if not then the internal power supply probably has a short in it and needs to be repaired. you can swap the fuse for a good one and hook it back up and make sure you don't touch any wires and if it blows it again then your issues is internal and will need repair if it doesn't and everything seems fine then wires could have touched or the amp was ran past it's limit and blew the fuse to protect it self. good luck and ask any more question you have
THIS MAY BE NORMAL. The starting transients can trip RCD's or GFCI's as we know them due to high frequency components that are not balanced due to capacitive coupling. IF you have the inputs connected to OTHER devices such as effects modules that also have line power to them there may be a ground loop.
ALWAYS connect any interconnected device to the same power source for equipment safety. Behringer is stingy on schematics.
You MIGHT try using a decent line filter to supply the unit. It has been a while since I repaired my 1000, but I don't recall any specific thing in the design to unbalance the current, HOWEVER the power does go through a thermal switch on the heat sink for the power transistors and the wiring CAN be dressed so that it might couple to the other internal wiring AND the safety ground. Suggest you try a small lamp in series with the safety ground (third wire) to see if you get any appreciable current there during startup. Make an adapter... DO NOT cut into your power cable to do this.