Hi Felix,
as in one of the other posts, I too have stupidly damaged my unit. In diagnosing the issue, I looked at the schematic and am wondering how part of it is intended to work. The section is attached. I understand of course how the mosfets introduce the shunt resistors for uA and nA, but I do not understand the logic of the mA circuit and how the RDSon of its mosfet is not significant in the path. Could you explain the idea behind the bypass mosfets also please. The NMA tag is a mystery as it does not appear anywhere else on the circuit.
A brief explanation would be helpful. Thanks