Read Sharp AR-M351U / AR-M451U (serv.man16) Service Manual online
AR-M351U/M451U, AR-M355U/M455U ADJUSTMENTS 8 - 11
B. Vertical image distortion balance adjustment
(Copy lamp unit installing position
adjustment)
adjustment)
1) Insert the front/rear mirror base drive wire into the frame
groove and press and fix it with the wire holder. At that time,
do not tighten the wire fixing screw. Change the direction of
the lamp positioning plate. (F and R)
do not tighten the wire fixing screw. Change the direction of
the lamp positioning plate. (F and R)
2) Push the copy lamp unit onto the positioning plate, and tighten
the wire fixing screw.
<Note for assembling the copy lamp unit>
After fixing, manually shift the copy lamp unit a few times to check
that it moves smoothly.
C. Vertical image distortion balance adjustment
(No. 2/3 mirror base unit installing and
position adjustment)
position adjustment)
This adjustment is to adjust the parallelism of the mirror base to
the OPC drum surface and the original surface.
the OPC drum surface and the original surface.
1) Manually turn the mirror base drive pulley to bring mirror base
B into contact with mirror base positioning plate.
If, at that time, the front frame side and the frame side of mirror
base B are brought into contact with the mirror base position-
ing plate simultaneously, the parallelism is correct and there is
no need for adjustment.
If, at that time, the front frame side and the frame side of mirror
base B are brought into contact with the mirror base position-
ing plate simultaneously, the parallelism is correct and there is
no need for adjustment.
D. Vertical (sub scanning direction) distortion
adjustment [Winding pulley position
adjustment]
adjustment]
This adjustment is executed in the following cases:
• When the mirror base drive wire is replaced.
• When the lamp unit, or No. 2/3 mirror holder is replaced.
• When a copy shown below is made.
1) Set A3 white paper on the original table as shown below.
2) With the original cover open, make a normal (X 1.0) copy.
3) Measure the black distance at the lead edge and the rear
edge of the copy paper.
If La = Lb, the procedures 4) through 7) are not required.
Lb
La
Original
Paper
exit
direction
exit
direction
Copy
Glass holding plate
Fit the paper edge and
the glass holding plate edge
the glass holding plate edge
A3 white paper
Paper exit direction
La : Lead edge black background section
Lb : Rear edge black background section
Lb : Rear edge black background section
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