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There are following two types of image distortion.

●

Horizontal image distortion

●

Vertical image distortion

In this machine, the image distortion is adjusted by changing
the parallelism of mirrors (copy lamp unit, No. 2/3 mirror unit).

I. Summary

Parallelism of mirrors can be made by installing the copy
lamp unit and No. 2/3 mirror unit to the reference position.
However, it must be checked by making a copy, and must
be adjusted if necessary.

II. Cases when the adjustment is required

1) When the copy lamp unit and No.2/3 mirror unit are dis-

assembled or their part is replaced. 

2) When the copy lamp unit and No.2/3 mirror unit drive

section is disassembled or its part is replaced. 

3) When the copy image is distorted as shown below:

III. Necessary tools

●

Screwdriver (+)

●

Hex wrench 

●

Scale

●

Test chart for distortion adjustment (Make a chart shown
below by yourself.)
Draw a rectangle on a paper (B4 or 8 1/2

″

 

×

 14

″

) as

shown below.
Be sure to make four right angles. 

IV. Adjustment procedure

1) Remove the right cabinet (manual paper feed unit), the

document reference plate. 

2) Remove the document glass.

3) Loosen the fixing screw of the copy lamp unit wire. 

4) Manually turn the copy lamp unit/No.2/3 mirror unit drive

gear to bring No.2/3 mirror unit into contact with No.2/3
mirror unit positioning plate. When No.2/3 mirror unit
makes contact with No.2/3 mirror unit positioning plate in
the rear frame side simultaneously, the mechanical paral-
lelism of No.2/3 mirror unit is proper. 
If one side of No.2/3 mirror unit makes contact with
No.2/3 mirror unit positioning plate and the other side
does not, the parallelism is improper. 
If the parallelism is improper, perform the procedure of
step 5).

Document

Copy A

Copy B

L

L

L

L

L = 10mm

1)

2)

3)

AL-1000/1010

9-1

5) Loosen the copy lamp unit/No.2/3 mirror unit drive pulley

setscrew in the side where No.2/3 mirror unit does not
make contact with No.2/3 mirror unit positioning plate. 

6) 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 in the same direction
of the loosened setscrew. When it makes contact with
No.2/3 mirror unit positioning plate, tighten and fix the
setscrew.

7) Manually turn the copy lamp unit/No.2/3 mirror unit drive

gear to bring No.2/3 mirror unit into contact with the
positioning plate, and perform the procedure of step 4).
Repeat procedures of steps 4) to 7) until the parallelism
of No.2/3 mirror unit is properly set.

8) With No.2/3 mirror unit positioning plate in contact with

No.2/3 mirror unit, bring the copy lamp unit into contact
with the right frame and fix the copy lamp unit to the drive
wire.
Procedures 1) to 8) are for adjustment of mechanical
horizontal parallelism. The copy lamp unit and No.2/3
mirror are fixed to the specified positions and the
mechanical horizontal parallelism of No.2/3 mirror is ad-
justed.
Then the optical horizontal parallelism must be adjusted
in the following procedures. 

9) Set the image distortion check chart on the document

table, and make a reduction copy (75%) on an A4 or 11

″

×

 8 1/2

″

 paper with the document cover open. 

Set screw

Scanner unit drive pulley

Copy lamp unit projection

50mm

Image distortion check chart

AL-1000/1010

9-2

10) Check the horizontal image distortion.

If LL = LR, there is no horizontal distortion

11) If LL is not equal to LR, perform the following proce-

dure.
Loosen the setscrew of the copy lamp unit/No.2/3 mirror
unit drive pulley in the front or the rear frame. 

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 mir-

ror unit drive pulley. 

14) Check the image distortion in the same manner as step

10).
Repeat procedures 11) to 14) until horizontal image dis-
tortion is eliminated.

I. Summary

In this adjustment, the left and right balance is adjusted by
changing the left and right balance of the No. 2 scanner unit
frame on the front frame side.

II. Note

●

Horizontal image distortion adjustment

III. Cases when the adjustment is required

1) When the copy lamp unit/No.2/3 mirror unit drive section

is disassembled or its part is replaced. 

2) When the copy image is distorted as follows:

IV. Necessary tools

●

Screwdriver (+)

●

Screwdriver (–)

●

Scale

●

Test chart for distortion adjustment (Make by yourself.)
Draw a rectangle on A4 or 8 1/2

″

 

×

 11

″

 paper as shown

below:
Be sure to make four right angles. 

V. 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

″

 

×

 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.)

2)

If all the four angles are right angles, there in no distor-
tion and the following procedures are not required. 

LL

LR

LL and LR: Distance between the copy
                   image horizontal line and 
                   the edge of the black 
                   background.

Black background

Set screw

Scanner unit drive pulley

Document

Copy C

Copy D

L

L

L

L

L = 10mm

Greater distortion

Smaller distortion

AL-1000/1010

9-3

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.

4) Make a copy to check the vertical image distortion.

If the four angles are right angles, the adjustment is com-
pleted. 

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 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.

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.)

Change the height of the right side of the rail.

Change the height of the left side of the rail.

AL-1000/1010

9-4