AR-M550 (serv.man14). (7) Settings and adjustments - Sharp Copying Equipment Service Manual (repair manual). Page 10

AR-M550/M620  SETTING AND ADJUSTMENTS  7 - 10

8) Without moving the scanner unit drive shaft, manually turn the

scanner unit drive pulley so that Scanner Unit B makes contact
with both of the two stoppers on the CCD mounting plate at the
same time.  (Change the positional relationship between the scan-
ner unit drive pulley and the drive shaft.)

9) With Scanner Unit B in contact with both of the two stoppers on the

CCD mounting plate at the same time, align the end face of Scan-
ner Unit A with the right-hand side end face of the frame, and fix
Scanner Unit A with the screws.

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 (about 30

mm in front of the document standard setting position), and make a
copy on A3 (11" x 7") paper with the SPF unit open.

3) Check for distortions in the sub scanning direction.

If La = Lb, there is no distortion.

L

L

L

L

L = 10mm

30mm