Sharp AR-F152, Service Manual

Page: 79 / 170

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.
6) Without moving the copy lamp unit/No.2/3 mirror unit drive pul-
ley 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 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.
8) With No.2/3 mirror unit positioning plate in contact with 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 adjusted.
Then the optical horizontal parallelism must be adjusted in the
following procedures.
9) Set the image distortion check chart on the document table, and
make a reduction copy (75%) on an A4 or 11
″ ×
8 1/2
″
paper
with the document cover open.
Set screw
Scanner unit drive pulley
Copy lamp unit projection
50mm
Image distortion check chart
AR-F152
8 – 2