Sharp AL-1043, Service Manual

Page: 65 / 126

AL-1551 ADJUSTMENTS 9-1
[9] ADJUSTMENTS
1. Optical section
A. Image distortion adjustment
There are two types of image distortion.
• Horizontal image distortion
• Vertical image distortion
In this machine, the image distortion is adjusted by changing the
parallelism of mirrors (copy lamp unit, No. 2/3 mirror unit).
(1) Horizontal image distortion adjustment
a. Summary
Parallelism of mirrors can be made by installing the copy lamp unit and
No. 2/3 mirror unit to the reference position. However, it must be checked
by making a copy, and must be adjusted if necessary.
b. Cases when the adjustment is required
1) When the copy lamp unit and No.2/3 mirror unit are disassembled or
their part is replaced.
2) When the copy lamp unit and No.2/3 mirror unit drive section is
disassembled or its part is replaced.
3) When the copy image is distorted as shown below:
c. Necessary tools
• Screwdriver (+)
• Hex wrench
• Scale
• Test chart for distortion adjustment (Make a chart shown below by
yourself.)
Draw a rectangle on a paper (B4 or 8 1/2" x 14") as shown below.
Be sure to make four right angles.
d. Adjustment procedure
1) Remove the right cabinet (manual paper feed unit), the document
reference plate.
2) Remove the document glass.
3) Loosen the fixing screw of the copy lamp unit wire.
Document
Copy A
Copy B
L
L
L L
L = 10mm
1)
2)
3)
Fixing Screws
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