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 distor-
tion is eliminated.
b. Vertical image distortion adjustment
I.
Summary
This adjustment is to adjust parallelism of the vertical optical axis
of the copier and that of each mirror to eliminate vertical image
distortion.
For adjusting vertical image distortion, the overall adjustment
and the right-left balance adjustment must be performed inde-
pendently.
The overall adjustment is performed by changing the height of
No.4/5 mirror unit in the front frame side. The right-left balance
adjustment is performed by changing the right-left balance of
No.2/3 scanner unit rail.
The right-left balance adjustment must be performed in advance
to the overall adjustment.
II.
Purpose
The purpose of this adjustment is to set parallelism of the verti-
cal optical axis of the copier and that of No.4/5 mirror unit and
No.2/3 mirror unit to eliminate vertical image distortion.
III.
Note
Before performing this adjustment, the following adjustments
must have been completed.
If not, this adjustment cannot be performed properly.
*
No.4/5 mirror unit right angle adjustment
*
Horizontal image distortion adjustment
IV.
Cases when the adjustment is required
1) When No.4/5 mirror unit is disassembled or its part is
replaced.
2) When the copy lamp unit/No.2/3 mirror unit drive section is
disassembled or its part is replaced.
3) When the copy image is distorted as follows:
V.
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.
VI.
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" x 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.)
If all the four angles are right angles, there in no distortion
and the following procedures are not required.
3) If the right-left distortion balance is improper, loosen the
fixing screw of No.2/3 mirror unit rail to change and adjust
the right-left balance of No.2/3 mirror unit rail.
(Note)
This procedure is to have the balance between the right
image distortion and the left image distortion, which does not
mean to eliminate the image distortion. Change the height of
No.2/3 mirror unit rail in the greater distortion side.
If the distortion in the lead edge side (when viewed in the
paper transport direction) is greater, change the height of the
left rail of No.2/3 mirror unit.
If the distortion in the rear edge side (when viewed in the
paper transport direction) is greater, change the height of the
right rail of No.2/3 mirror unit.
No. 2/3 mirror unit
Copy lamp unit
Document
Copy C
Copy D
L
L
L
L
L = 10mm
Greater distortion
Smaller distortion
Change the height of the right side of the rail.
Change the height of the left side of the rail.
9 – 8
www.freeservicemanuals.info
1/11/16
Published in Heiloo, Holland.
