Ricoh D197 Service Manual page 341

External Keyboard Bracket Type M3 (D739-10)
11. Route the keyboard cable along the rear side of the scanner unit ( x1).
12. Adjust the keyboard cable by making loops if the keyboard cable has too much slack.
13. Remove the cutout [A] in the left rear cover to make a cable hole, and then pass the
keyboard cable [B] through it.
SM 2-271 D197/D198/D199/D200/D201/D202