Sharp AR-6020V Service Manual page 35

NOTE: Due to TR (DCE-1035), the pulley fixing screw can no lon-
ger be loosened/tightened.
For Scanner (reading) unit parallelism adjustment and
Scan image (sub scanning direction) distortion adjustment,
please perform those adjustments by adjusting the pulley
angle of Scanner unit B front frame side.
7) With the scanner unit B in contact with both stoppers, fit the
edge of the scanner unit A with the right edge of the frame, and
fix the scanner unit A with the fixing screw.
2-C Scan image (sub scanning direction)
distortion adjustment
1) Make a test chart on A3 (11" x 17") paper as shown below.
(Draw a rectangular with four right angles.)
2) Set the test chart prepared in the procedure 1) on the docu-
ment table, and make a copy on A3 (11" x 17") paper.
3) Check for distortion in the main scanning direction.
If the four angles of the rectangle of the copy image are right
angles, it is judged that there is no distortion. (The work is
completed.)
If there is any distortion in the main scanning direction, perform
the following procedure.
4) Check the difference (distortion balance) between left-hand
and right-hand side images distortions.
There is no difference
between the distortion on
the right and that on the left.
If Lc = Ld, the distortion on the left is equal to that on the right.
(The distortions are balanced.)
If the above condition is satisfied, go to the procedure 6).
If not, perform the following procedures.
5) Change the height balance of the scanner rail on the front
frame side.
Remove the lower cabinet of the operation panel. Loosen the
scanner rail fixing screw to change the balance between the
right and the left heights of the scanner rail.
Repeat the procedures 2) - 5) until the difference between the
image distortions (distortion balance) is deleted.
6) Without changing the balance of the scanner rail on the front
frame side, change the overall height.
7) Set the test chart prepared in the procedure 1) on the docu-
ment table, and make a copy on A3 (11" x 17") paper. Check
that the distortion in the main scanning direction is within the
specified range.
Repeat the procedures 6) and 7) until the distortion in the main
scanning direction is in the specified range.
Repeat the procedures 2) - 6) until the condition of the procedure 3)
is satisfied.
If the distortion in the sub scanning direction cannot be deleted with
the above procedures, perform ADJ 4A Scanner (reading) unit par-
allelism adjustment.
AR-6020V ADJUSTMENTS 5 – 6
Lc Lc
Copy A
Ld
There is some difference
between the distortion on
the right and that on the left.
Lc Ld
Copy B
Ld
Lc Ld