AR-M550 (serv.man14). (7) Settings and adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 12

AR-M550/M620  SETTING AND ADJUSTMENTS  7 - 12

This adjustment is needed in the following situations: 

• The scanner (reading) section has been disassembled. 

• Scanned images are distorted. 

1) Make a test chart on A3 (11" x 17") paper as shown below. (Draw a

rectangular with four right angles.)

2) Set the test chart made in step 1 on the document table, and make

a copy on A3 (11" x 17") paper.

3) Check for distortions in the main scanning direction.

If the four angles of the rectangle on the copy are right angles,
there is no distortion and therefore  no further steps are needed.

If there is some distortion in the main scanning direction, do the follow-
ing steps. These steps assume that there is no or little difference in dis-
tortion between the paper's leading and trailing edges.

If there is some difference in distortion between the paper's leading
and trailing edges, these steps should be preceded by the adjustment
steps described in "ADJ 3D: Adjust scanned image distortions in the
main scanning direction - 1", intended to provide almost the same level
of distortion on the leading and trailing edges.

4) Remove the document table glass, and make adjustments by turn-

ing the main scanning direction image distortion adjusting screw.

• If the rear frame side image is shifted toward the paper's leading

edge, then turn the adjusting screw clockwise. 

• If the front frame side image is shifted toward the paper's leading

edge, then turn the adjusting screw counterclockwise. 

Repeat steps 2 to 4 until an acceptable result is obtained.

It changes approx. 0.5mm by 90 degrees rotation.

This adjustment is needed in the following situations: 

• The SPF section has been disassembled. 

• The SPF unit has been replaced. 

1) Create two check sheets for SPF levelness adjustment by cutting

copy paper as illustrated below: 

2) Insert each of the two check sheets in between the CIS guide boss

and the glass for SPF mode on each of the front and rear frame
sides, and then close the SPF unit.

L

L

L

L

L = 10mm

A4 size