Read Sharp AR-285 (serv.man11) Service Manual online
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.
4) Loosen the fixing screw of the front or the rear frame mirror base
drive pulley.
•
If La < Lb, turn the rear frame mirror base drive pulley in
direction B. (Do not move the mirror base drive pulley shaft.)
direction B. (Do not move the mirror base drive pulley shaft.)
•
If La > Lb, turn the rear frame mirror base drive pulley in
direction A. (Do not move the mirror base drive pulley shaft.)
direction A. (Do not move the mirror base drive pulley shaft.)
5) Tighten the fixing screw of the mirror base drive pulley.
6) Perform procedures 1) through 3).
7) If La is not equal to Lb, perform procedures 4) and 5).
If La = Lb, the adjustment is completed.
Repeat procedures 1) through 6) until La = Lb.
Repeat procedures 1) through 6) until La = Lb.
(4) Main scanning direction distortion adjustment (Lower
rail height adjustment)
When there is no distortion in the direction of mirror base scanning
and there is sub scanning direction distortion, it can be adjusted by
changing the No. 2/3 mirror base unit rail height.
and there is sub scanning direction distortion, it can be adjusted by
changing the No. 2/3 mirror base unit rail height.
•
Before this adjustment, perform the horizontal image distortion ad-
justment in the laser scanner section.
justment in the laser scanner section.
This adjustment must be performed in the following cases:
•
When the mirror base wire is replaced.
•
When the copy lamp unit and no. 2/3 mirror unit are replaced.
•
When the mirror unit rail is replaced and moved.
•
When a copy shown below is made.
1) Make an original for the adjustment.
Draw parallel lines at 10mm from both sides of an A3 white paper.
2) Make a copy of the adjustment original on an A3 white paper at
the normal magnification ratio.
(Fit the paper edge and the glass holding plate edge.)
3) Measure the distances between the lines and the corners (4 posi-
tions of La, Lb, Lc, Ld).
When La = Lb = Lc = Ld, there is no need for adjustment.
Allow a little space.
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
A
Front side
Rear side
B
Original
Copy
10mm
10mm
10mm
10mm
Parallel line
White paper
Parallel line
La
Lb
Ld
Lc
Paper exit
direction
direction
7 – 9
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