Specifications

AL-1551 ADJUSTMENTS 9-3
9) Set the image distortion check chart on the document table, and
make a reduction copy (75%) on an A4 or 11" x 8 1/2" paper with the
document cover open.
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 procedure.
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 mirror unit drive
pulley.
14) Check the image distortion in the same manner as step 10).
Repeat procedures 11) to 14) until horizontal image distortion is
eliminated.
(2) Vertical image distortion adjustment
a. 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.
b. Note
• Horizontal image distortion adjustment
c. 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:d. Necessary tools
d. Necessary tools
• Screwdriver (+)
• Screwdriver (-)
•Scale
• Test chart for distortion adjustment (Make by yourself.)
Draw a rectangle on A4 or 8 1/2" x 11" paper as shown below:
Be sure to make four right angles.
50mm
Image distortion check chart
LL LR
Black background
LL and LR:
Distance between the copy
image horizontal line and
the edge of the black
background.
Set screw
Scanner unit drive pulley
Document
Copy C
Copy D
L
L
L L
L = 10mm