10) Check the horizontal image distortion.
If LL = LR, there is no horizontal distortion
11) If LL is not equal to LR, perform the following proce-
dure.
Loosen the setscrew of the copy lamp unit/No.2/3 mirror
unit drive pulley in the front or the rear frame.
12) Without moving the copy lamp unit/No.2/3 mirror unit
drive pulley shaft, manually turn the copy lamp
unit/No.2/3 mirror unit drive pulley whose setscrew was
loosened, and adjust the parallelism of copy lamp
unit/No.2/3 mirror unit.
13) Tighten the set screw of the copy lamp unit/No.2/3 mir-
ror unit drive pulley.
14) Check the image distortion in the same manner as step
10).
Repeat procedures 11) to 14) until horizontal image dis-
tortion is eliminated.
b. Vertical image distortion adjustment
I. Summary
In this adjustment, the left and right balance is adjusted by
changing the left and right balance of the No. 2 scanner unit
frame on the front frame side.
II. Note
●
Horizontal image distortion adjustment
III. Cases when the adjustment is required
1) When the copy lamp unit/No.2/3 mirror unit drive section
is disassembled or its part is replaced.
2) When the copy image is distorted as follows:
IV. Necessary tools
●
Screwdriver (+)
●
Screwdriver (–)
●
Scale
●
Test chart for distortion adjustment (Make by yourself.)
Draw a rectangle on A4 or 8 1/2
″
×
11
″
paper as shown
below:
Be sure to make four right angles.
V. Adjustment procedure
1) Set the test chart for image distortion adjustment on the
document glass, and make a normal copy on a paper of
A4 or 8 1/2
″
×
11
″
.
2) Check image distortion in the right and the left sides.
If the both vertical lines are in parallel with each other,
the right-left distortion balance is proper. (However, there
may be some distortion.)
2)
If all the four angles are right angles, there in no distor-
tion and the following procedures are not required.
LL
LR
LL and LR: Distance between the copy
image horizontal line and
the edge of the black
background.
Black background
Set screw
Scanner unit drive pulley
Document
Copy C
Copy D
L
L
L
L
L = 10mm
Greater distortion
Smaller distortion
AL-1000/1010
9-3
