AR-155 (serv.man10). AR150 155 ARF151 Service Manual-Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 4

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 procedure.

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 pul-

ley 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 distortion
is eliminated.

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.

●

Horizontal image distortion adjustment

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

assembled or its part is replaced. 

2) When the copy image is distorted as follows:

●

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. 

1) Set the test chart for image distortion adjustment on the docu-

ment 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 distortion 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

AR-F151

8  –  3