Read Sharp AL-800 (serv.man6) Service Manual online
3) Check the main scanning direction distortion.
If the four angles of the copy are right angles, there is no distor-
tion.
tion.
If there is any distortion in the sub scanning direction, perform the
following procedures.
following procedures.
4) Check the distortion difference (distortion balance) between the
right and the left sides.
If Lc = Ld, the image distortions of the right and the left sides are
equal to each other.
equal to each other.
If the above condition is satisfied go to procedure 9).
If the above condition is not satisfied, perform the following proce-
dures.
dures.
5) Check the height of the scanner rail on the rear frame side.
If the scanner rail heights (on the right and the left sides) from the
scanner chassis level are not 9.0mm, adjust so that they are
9.0mm.
scanner chassis level are not 9.0mm, adjust so that they are
9.0mm.
6) Set the test chart made in procedure 1) on the document table,
and make a copy on A4 (11"
×
8.5") paper.
7) Check the distortion difference (distortion balance) between the
right and the left sides.
If Lc = Ld, the image distortions of the right and the left sides are
equal to each other.
equal to each other.
If the above condition is satisfied go to procedure 9).
If the above condition is not satisfied, perform the following proce-
dures.
dures.
8) Change the height balance of the scanner rail on the front frame
side.
Repeat procedures 6)
∼
8) until the image distortion difference
(distortion balance) becomes zero.
9) If the image distortion difference becomes zero, change the over-
all height of the front frame side scanner rail.
10) Set the test chart made in procedure 1) on the document table
and make a copy on A4 (11"
×
8.5") paper. Check that the main
scanning direction distortion is within the specified range.
Repeat procedures 9)
∼
10) until the main scanning direction dis-
tortion is within the specified range.
*
Preliminary work
JOB No.
Content
ADJ M2/ADJ 2
Copy sub scanning direction distortion
*
After-work
JOB No.
Content
ADJ M3
Copy magnification ratio adjustment
*
Necessary tool
Name
Scale
Parts code/Price rank
—
ADJ M3
Copy magnification ratio adjustment
Content
Preliminary
work
After-
work
JOB No
JOB No
ADJ M3
Copy
magnification
ratio adjustment
magnification
ratio adjustment
ADJ 1 Main scanning
direction
magnification
ratio (focus,
resolution)
adjustment
magnification
ratio (focus,
resolution)
adjustment
ADJ M3/
ADJ 3
ADJ 3
ADJ M4/
ADJ 2
ADJ 2
ADJ 2 Sub scanning
direction copy
magnification
ratio adjustment
magnification
ratio adjustment
ADJ M4/
ADJ 1
ADJ 1
ADJ 1
Copy focus (resolution), main scanning
direction copy magnification ratio
adjustment
direction copy magnification ratio
adjustment
*
Location
Copy A
Copy B
Ld
Lc = Ld
Lc
Ld
Lc
Lc Ld
Though there is some distortion,
there is no difference between the
right and the left distortions.
there is no difference between the
right and the left distortions.
There is some difference between
the right and the left distortions
the right and the left distortions
9mm
ADJ M4
7 – 7
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