R99 & R4 = 120K
R6 & R8 = 180K

3RP1

Pin    Board
1.      f (filament)
2.      G
3.      K
4.      F
5.      nc
6.      X1
7.      X2
8.      A
9.      Y1
10.     Y2
11.     nc
12.     f (filament)