AR-155 (serv.man10). AR150 155 ARF151 Service Manual-Adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 2

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 paral-
lelism of mirrors (copy lamp unit, No. 2/3 mirror unit).

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.

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

sembled 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:

●

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. 

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

ment 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 simul-
taneously, the mechanical parallelism of No.2/3 mirror unit is
proper. 
If one side of No.2/3 mirror unit makes contact with No.2/3 mir-
ror unit positioning plate and the other side does not, the paral-
lelism 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)

Fixing Screws

AR-F151

8 – 1