C. Adjustment contents
(1) Lens
a. Lens unit right angle adjustment
I.
Summary
By setting the optical axis of the copier body and that of the lens
in parallel with each other, copy image distortion due to the lens
can be reduced.
The horizontal angle of the lens unit slide shaft is changed by
changing the position of the lens unit slide shaft fixing plate.
This adjustment is performed not by checking a copy image, but
by visual measurement with the mark on the optical unit base as
the reference.
The copy image distortion must be adjusted not only in this
adjustment but also in the mirror parallelism adjustment.
II.
Purpose
The purpose of this adjustment is to reduce copy image distor-
tion due to the lens by setting the optical axis of the copier body
and the optical axis of the lens in parallel with each other.
III.
Note
The copy image distortion adjustment is completed by making a
copy and adjusting parallelism of the mirror.
For that purpose, this adjustment must have been properly per-
formed.
IV.
Cases when the adjustment is required
1) When the lens or the lens unit is disassembled or its part is
replaced.
2) When the copy image is distorted as follows (because of
different copy magnification ratios in different sections):
V.
Necessary tool
*
Screwdriver (+)
VI.
Adjustment procedure
1) Remove the right upper side cabinet and the document refer-
ence plate.
2) Remove the document glass.
3) Remove the optical unit cover.
4) Hold section A of the lens unit slide, and move the lens unit
side section to the mark on the optical unit base.
5) Loosen the lens unit slide shaft fixing screw.
6) Fix the lens unit slide shaft fixing plate in the center mark
position.
Document
Copy
Large copy
magnification ratio
Normal copy
magnification ratio
Small copy
magnification ratio
Document
reference plate
Document table glass
Right upper side cabinet
Optical unit cover
Section A
Optical unit
base
Mark
A
A
B
B
Lens unit slide shaft
fixing plate
Center mark
7 – 6
