Ricoh D129 Service Manual page 168

Scanner
7. Remove the tape from the drive pulley.
8. Insert a scanner-positioning pin [L] through the 2nd carriage hole [M] and the left holes [N]
in the front rail. Insert another scanner positioning pin [O] through the 1st carriage hole [P]
and the right holes in the front rail [Q].
9. Insert two more scanner positioning pins through the holes in the rear rail.
10. Screw the drive pulley to the shaft [R].
11. Screw the scanner wire bracket to the front rail [S].
12. Install the scanner wire clamp [T].
13. Pull out the positioning pins.

Make sure the 1st and 2nd carriages move smoothly after you remove the
positioning pins. Do steps 8 through 13 again if they do not.

After replacing the scanner wire, do the image adjustments in the following section
of the manual (
D129/D130
"Scanning" in "Copy Adjustments: Printing/Scanning").
4-28 SM