Copy Magnification Ratio Adjustment - Sharp AL-1000 Service Manual

3) If the right-left distortion balance is improper, loosen the
fixing screw of No.2/3 mirror unit rail to change and ad-
just 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.
Change the height of the right side of the rail.
Change the height of the left side of the rail.
4) Make a copy to check the vertical image distortion.
If the four angles are right angles, the adjustment is com-
pleted.

(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.
a. Outline
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 per-
form the main scanning (front/rear) direction magnification
ratio adjustment automatically.
Manual adjustment: The adjustment is made by manual key
operations. (In either of the automatic and manual adjust-
ments, the zoom data register set value is changed for ad-
justment.)
The magnification ratio in the sub scanning direction is ad-
justed by changing the mirror base (scanner) scanning
speed.
b. Main scanning direction magnification ratio ad-
justment
I. Note
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.
II. 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 sec-
tion 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 per-
formed.
III. Necessary tools
Screwdriver (+)
Scale
IV. Adjustment procedure
1) Set the scale vertically on the document table. (Use a
long scale for precise adjustment.)
9-4
AL-1000/1010