Sharp AR-651 Service Handbook page 101

4. Slide the lens unit forward or backward using the marks on the lens base as a guide.
The following table shows the relation between the difference in the reproduction ratio between the
copied ruler and the actual ruler and the movement amount of the lens unit.
Reproduction-ratio error Movment amount of unit
0.1 %
0.2 %
0.3 %
0.4 %
0.5 %
0.6 %
0.7 %
0.8 %
0.9 %
1.0 %
Note: Finer adjustment can be made in the "Fine adjustment of polygonal motor rotation speed/Copier (05-405)".
5. Attach the lens cover and original glass. Make a copy to confirm the reproduction ratio.
6. Remove the original glass and lens cover again, and tighten 2 screws to fix the lens unit.
7. Reattach the lens cover and original glass.
0.5 mm
1.0 mm
1.5 mm
2.0 mm
2.5 mm
3.0 mm
3.5 mm
3.9 mm
4.4 mm
4.9 mm
3 - 31
Direction of movement
Reproduction ratio
error is large
Reproduction
ratio error is
small
Lens unit Feeding side
Exit side
AR-651/810 ADJUSTMENT