Nikon VBA23001 Repair Manual page 73

・Raise the mirror.
・Take out the two screws (#624). Take out the two screws (#624).
・Take out the screw (#698). Take out the screw (#698).
・Remove the aperture control unit (#B241RP). Remove the aperture control unit (#B241RP).
Aperture control unit (#B241RP)
Screw (#624)×2
- D67 ･ D90 -
INC
VBA23001-R.3762 .A
Screw (#698)