5-4
Service Manual
Y101700-5
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:
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.
4) Make a copy to check the vertical image distortion.
If the four angles are right angles, the adjustment is
completed.
5.2 Copy magnification ratio adjustment
The copy magnification ratio must be adjusted in the main
scanning direction and in the sub scanning direction.
To adjust, use SIM 48-1.
The main scanning (front/rear) direction magnification ratio
adjustment is made automatically or manually.
Automatic adjustment: The width of the reference line marked
on the shading correction plate is scanned to perform the
main scanning (front/rear) direction magnification ratio adju-
stment automatically.
Manual adjustment: The adjustment is made by manual key
operations. (In either of the automatic and manual adjustmen-
ts, the zoom data register set value is changed for adjust-
ment). The magnification ratio in the sub scanning direction is
adjusted by changing the mirror base (scanner) scanning
speed.
5.2.1 Main scanning direction magnification
ratio adjustment
Before performing this adjustment, the following adjustments
must have been completed. If not, this adjustment cannot be
performed properly.
• Image distortion adjustment
• The lens unit must be installed in the reference position.
5.2.1.1 Cases when the adjustment is required
1) When the lens and the mirror unit are disassembled or the
part is replaced.
2) When the copy lamp unit/No.2/3 mirror unit drive section
is disassembled
or the part is replaced.
3) When the main PWB is replaced.
4) When the EEPROM in the main PWB is replaced.
5) When “U2” trouble occurs.
6) When the copy image distortion adjustment is performed.
5.2.1.2 Necessary tools
• Screwdriver (+)
• Scale
5.2.1.3 Adjustment procedure
1) Set the scale vertically on the document table. (Use a
long scale for precise adjustment.)
2) Set the copy magnification ratio to 100%.
3) Make a copy on A4 or 81/2” x 11” paper.
