Ricoh G188 Service Manual page 73

Punch Unit (B807)
9. Install the punch unit stay [J] from the front side ( x 3).
10. Install the sub-scan registration sensor guide [K] from the top ( x 1).
11. Remove the bracket [L] from the punch unit ( x 1).
12. Install the punch unit [M] along the punch unit stay from the rear side.
13. Make sure to put the punch unit stay pin [N] through the hole [O].
SM 2-33 G188/G189