Adjust The Scanner (Reading) Unit Parallelism - Sharp AR-M550N Service Manual

: Feb. 9 2004
1
Repeat steps 5 to 11 until an acceptable result is obtained.
1
ADJ 3B Adjust the scanner (reading) unit
parallelism
This adjustment is needed in the following situations:
• The scanner (reading) section has been disassembled.
• Scanned images are distorted.
1) Loosen the fixing screws for Scanner Unit A and scanner drive wire
to release the scanner unit from the drive wire.
b
a
AR-M550/M620/M700 SETTING AND ADJUSTMENTS 7 - 9
2) Manually turn the scanner drive pulley, and move Scanner Unit B
until contact with the two stoppers on the CCD mounting plate.
If Scanner Unit B makes contact with the two stoppers on the CCD
mounting plate simultaneously, the parallelism of Scanner Unit B is
proper.
If this requirement is not met, do the following steps.
3) Loosen the pulley angle fixing screw on either the front or rear
frame side of Scanner Unit B.
4) Adjust the pulley angle position on Scanner Unit B so that the
scanner unit makes contact with both of the two stoppers on the
CCD mounting plate at the same time.
5) Fix the pulley angle on Scanner Unit B.
If the above steps fail to provide an acceptable result, then do the fol-
lowing steps.
6) Loosen the fixing screw of the scanner unit drive pulley that is not
in contact.
7) Manually turning the scanner unit drive pulley, move Scanner Unit
B until it comes into contact with the two stoppers on the CCD
mounting plate.
Scanner Unit B
Winding pulley