Sharp AL-1000 Service Manual page 51

5) Loosen the copy lamp unit/No.2/3 mirror unit drive pulley
setscrew in the side where No.2/3 mirror unit does not
make contact with No.2/3 mirror unit positioning plate.
Scanner unit drive pulley
6) Without moving the copy lamp unit/No.2/3 mirror unit
drive pulley shaft, manually turn the copy lamp
unit/No.2/3 mirror unit drive pulley in the same direction
of the loosened setscrew. When it makes contact with
No.2/3 mirror unit positioning plate, tighten and fix the
setscrew.
7) Manually turn the copy lamp unit/No.2/3 mirror unit drive
8) With No.2/3 mirror unit positioning plate in contact with
Set screw
9) Set the image distortion check chart on the document
9-2
gear to bring No.2/3 mirror unit into contact with the
positioning plate, and perform the procedure of step 4).
Repeat procedures of steps 4) to 7) until the parallelism
of No.2/3 mirror unit is properly set.
No.2/3 mirror unit, bring the copy lamp unit into contact
with the right frame and fix the copy lamp unit to the drive
wire.
Procedures 1) to 8) are for adjustment of mechanical
horizontal parallelism. The copy lamp unit and No.2/3
mirror are fixed to the specified positions and the
mechanical horizontal parallelism of No.2/3 mirror is ad-
justed.
Then the optical horizontal parallelism must be adjusted
in the following procedures.
Copy lamp unit projection
table, and make a reduction copy (75%) on an A4 or 11"
× 8 1/2" paper with the document cover open.
50mm
Image distortion check chart
AL-1000/1010