Ricoh D131 Service Manual page 219

7. Adjust the position of the laser exposure unit.

If the pattern is skewed at the corner of the leading edge [C], move the unit so it moves
the pointer on the scale toward the back.

If the pattern is skewed at the lower left corner of the trailing edge [D], move the unit so it
moves the pointer on the scale toward the front.

The scale is set for increments of 1 mm.
8. After adjustment, tighten the screws on the laser exposure unit, re-assemble the machine and
print the pattern again with SP2902-003 No.18.
9. Check the pattern. Repeat the procedure if more adjustment is required.
SM 4-33
Laser Unit
D131/D132/D133