Adjust The Scanner (Reading) Unitparallelism - Sharp MX-M550U Service Manual

8) Check the printed grid pattern for distortions.
[Check Method 1]
Compare the front frame side and rear frame side of the
printed paper in terms of the distance between the outer end of
the grid pattern image and the edge of the paper.
No adjustment is needed if the difference between these
dimensions is within 0.5 mm.
R
Ra-Fb< 0.5mm
F
[Check Method 2]
Check the printed grid pattern for distortions.
If the right-angle level of the traverse print line is 0.5mm or less
with respect to the longitudinal print line of paper, no adjust-
ment is needed.
Carry out the following work if the situation is unsatisfactory.
9) Draw out the manual paper feed tray, and remove the front
frame side, side cover, fan cover cabinet, and fan unit.
10) Remove the fan unit.
a
b
MX-M700N ADJUSTMENTS 6 – 8
11) Loosen the LSU fixing screws, and change the LSU fixing
angle.
* If the vertical line image is inclined to the left with respect to the
front frame side, move the LSU fixing plate in arrow direction (a).
* If the vertical line image is inclined to the right with respect to the
front frame side, move the LSU fixing plate in arrow direction (b).
Repeat steps 5 to 11 until an acceptable result is obtained.
3-B 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