Sharp AR-M550U - Adjust Scanned Image Distortions in the Sub-Scanning Direction

AR-M550/M620/M700 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.
ADJ 3C Adjust scanned image distortions in the
sub-scanning direction
L
L
L
L
L = 10mm
A5
B5
A4
A5
B4
B5
A3
A4
11
8
1
2
5
1
2
A5 B5 B4 A3
A4
A5 B5 A4
8
1
2
11 13 14 175
1
2
30mm