Sharp AR-651 (serv.man4) Service Manual ▷ View online
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AR-651/810 ADJUSTMENT
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 %
0.5 mm
0.2 %
1.0 mm
0.3 %
1.5 mm
0.4 %
2.0 mm
0.5 %
2.5 mm
0.6 %
3.0 mm
0.7 %
3.5 mm
0.8 %
3.9 mm
0.9 %
4.4 mm
1.0 %
4.9 mm
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.
Direction of movement
Reproduction ratio
error is large
error is large
Reproduction
ratio error is
small
ratio error is
small
Exit side
Lens unit Feeding side
AR-651/810 ADJUSTMENT
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3. 7. Adjustment of Paper Feeding System
3. 7. 1. Sheet sideways deviation caused by paper feeding
<Procedure>
• The center of the printed image shifts to the rear
side.
Move the guide to the rear side or the
front cover to the front side with the tandem LCF
(the direction (A) in the figures below).
• The center of the printed image shifts to the front
side.
Move the guide to the front side or the
front cover to the rear side with the tandem LCF
(the direction (B) in the figures below).
Feeding
direction
direction
Center
Front
Feeding
direction
direction
Center
Front
• Bypass feeding
(B)
(A)
• Cassette feeding
(A)
(B)
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AR-651/810 ADJUSTMENT
• Tandem LCF
Move the screws to the long holes and adjust the position of the front cover along the front-rear
direction.
(A)
(B)
(A)
(B)
AR-651/810 ADJUSTMENT
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3. 8. Adjustment of Developer Unit
(1) Doctor-sleeve gap
The doctor-sleeve gap is set by putting both edges
of the doctor blade against the protrusions of the
front and rear side frames and fixing the blade.
Therefore, the adjusment of the gap is not
necessary.
(2) Drum-sleeve gap
The drum-sleeve gap is set by putting the guide
rollers of the developer unit against the cleaner unit.
Therefore, the adjustment of the gap is not
necessary.
(3) Pole position of the developer sleeve
The pole positions of the developer sleeves are
set by installing the sleeve holders and pole
position fixing bushings. Therefore, the adjustment
of the pole position is not necessary.
Doctor blade
Protrusion
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