Sharp AR-BC260 Service Manual page 109

6) With the scanner unit B in contact with the both stoppers on
the CCD mounting plate at the same time, fit the edge of the
scanner unit A with the frame right edge and fix the scanner
unit A with the screw.
ADJ 6B Copy image sub scanning direction
distortion adjustment
1) Make a test chart on A3 (11" x 17") paper as shown below.
(Draw a rectangular with four right angles.)
L
L
L
2) Set the test chart made in procedure 1) on the document
3) Check for distortion in the sub scanning direction.
If there is some distortion in the sub scanning direction, perform
the following procedures.
4) Loosen either of two fixing screws of the scanner unit drive
5) With the scanner unit drive shaft kept stationary, turn the scan-
6) Tighten the scanner unit drive pulley fixing screw.
If the distortion in the sub scanning direction cannot be deleted
L
with the above procedures, perform ADJ 6D, Scan image distor-
tion adjustment.
L = 10mm
AR-BC260 SETTING AND ADJUSTMENTS 8 - 16
table. (Leave a space of about 30mm between the reference
position and the test chart.) With the document cover open,
make a copy on A3 (11" x 17").
If La = Lb, there is no distortion.
La
pulley. (Either one on the front or the rear side will do.)
ner unit drive pulley manually to change the parallelism of
scanner units A and B. (Change the relative positions of the
scanner unit drive pulley and the drive shaft.)
Repeat procedures 2) – 6) until the condition of procedure 3)
is satisfied.
Lb