Sharp Z-810 Service Manual page 52

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4) Change the height of the roller in No.4/5 mirror unit front
frame side to adjust the vertical image distortion.
If the copy image is tilting as shown in sample (X) below,
lower No.4/5 mirror unit. If it is tilting as shown in sample (Y)
below, lift No.4/5 mirror unit.
(X)
5) Make a copy to check the vertical image distortion.
If the four angles are right angles, the adjustment is com-
pleted.
Repeat procedures 4) and 5) until the vertical image distor-
tion is eliminated.
(Note) If a vertical image distortion is not eliminated with
procedure 4), change the overall height of No.2/3
mirror unit rail. Then repeat procedures 1) to 5).
VII. Troubles caused by improper adjustment
(3) Copy image center position adjustment
I. Summary
The optical axis is changed by changing the lens holder position
to optically align the document table and the vertical position of
the copy image on the copy paper.
When the lens holder position is changed, the lens position in
the front and the rear frame direction is changed to change the
optical axis.
As a result, the document table is optically aligned with the copy
image on the copy paper.
II. Purpose
The purpose of this adjustment is to set the copy image center
at the vertical center of the copy paper.
III. Note
Before performing this adjustment, the following adjustment
must have been completed. If not, this adjustment cannot be
performed properly.
* No.4/5 mirror unit right angle adjustment
* Image distortion adjustment
(Y)
9 – 9
Published in Heiloo, Holland.
IV. Cases when the adjustment is required
1) When the lens unit is disassembled or its part is replaced.
2) When the copy image is shifted from the vertical center of
the paper.
V. Necessary tool
* Screwdriver (+)
* Scale
* Test chart for center position adjustment (Make a chart
shown below by yourself.)
Draw a line in the paper transport direction at the center of A4
or 8 1/2" x 11" paper.
VI. Adjustment procedure
1) Set the test chart for center position adjustment at the docu-
ment reference position.
2) Make a normal copy (100%) in the manual paper feed mode
on A4 or 8 1/2" x 11" paper.
3) Check that the image of the line is at the center of the paper.
(Standard: 0±2.0mm)
(Copy A)
(Copy B)
(Paper feed direction)
4) If the image of the line is not at the center of the paper,
perform the following procedure.
5) Remove the right side cabinet (manual paper feed unit) and
the document reference plate.
6) Remove the document glass.
Center
Copy paper
(A4 or 8 1/2" x 11")
2.0mm or less
Copy image
Copy paper
Shift
fold
2.0mm or less
Copy image
Copy paper
fold
Shift
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