VII.
Trouble caused by improper adjustment
b. No. 4/5 mirror unit drive cam position adjustment
I.
Summary
The copy magnification ratio and focus are properly adjusted by
matching the lens unit movement and the No. 4/5 mirror move-
ment.
This adjustment is performed by changing the relative positions
of the lens unit drive gear and the No. 4/5 mirror unit drive cam.
II.
Purpose
The purpose of this adjustment is to adjust the relative positions
of the lens unit drive gear and the No. 4/5 mirror unit drive cam
and to adjust the copy magnification ratio and the focus.
III.
Note
IV.
Cases when the adjustment is required
1) When the lens and the No. 4/5 mirror drive section are disas-
sembled or its part is replaced.
2) When the focus is improper though the copy magnification
ratio is proper, or vice versa.
V.
Necessary tools
*
Screwdriver (+)
*
M4 x 20 screw
VI.
Adjustment procedure
1) Set the copy magnification ratio to 100%, and set the lens
unit to the position for 100% copy magnification ratio.
2) Remove the right side cabinet and the document reference
plate.
3) Remove the document glass.
4) Remove the optical unit cover.
5) Loosen the No. 4/5 mirror unit drive cam fixing screw without
moving the lens unit drive gear.
6) Turn the No. 4/5 mirror unit drive cam without moving the
lens unit drive gear so that the cam positioning hole is fit with
the reference hole in the optical unit frame.
7) Pass the M4 x 20 screw through the No. 4/5 mirror unit drive
cam positioning hole and fix the screw to the frame without
turning the cam.
8) Tighten the cam fixing screw to fix the No. 4/5 mirror unit
drive cam to the lens unit drive gear without moving the lens
unit drive gear.
9) Remove the screw which was fixed to the frame in procedure
7).
VII.
Troubles caused by improper adjustment
(3) Image distortion adjustment
There are following two types of image distortion.
*
Horizontal image distortion
*
Vertical image distortion
Image distortion is generated mainly by insufficient parallelism of the
mirror and misalignment of the lens optical axis.
In this model, image distortion is adjusted by adjusting parallelism of
each mirror.
a. Horizontal image distortion adjustment
I.
Summary
This adjustment is to adjust horizontal image distortion by setting
the horizontal optical axis of the copier and the horizontal optical
axis of each mirror in parallel with each other. The relative posi-
tions of the front frame and the scanner unit drive pulley of the
frame are changed to perform the above adjustment.
Document
reference plate
Document table glass
Right upper side cabinet
Optical unit cover
Cam
Cam fixing screw
Do not move
Cam fixing
screw
Do not move.
Frame
Reference
hole
Requires changing relative
position of cam and gear
when having an out of focus
copy in the enlargement
reduction copy mode
Standard fixing position
7 – 8
