IK42 is an input channel for a mixer, not an EQ. (Indgangs Kanal)
So it's not clear what you are asking.
Note that NP schematics are rare as hen´s teeth - whenever you find anything NP, please try to trace its origin back to where it came from, they are most probably the ONLY ones that have a schematic for that exact module. NP himself always delivered documentation with unit, and never kept backup copies himself. This because most of his stuff was built on special order for DR anyway.
/Jakob E.