6)
Without moving the scanner unit drive pulley shaft, manual-
ly turn the scanner unit drive pulley in the same side of the
loosened setscrew. When it makes contact with No.2 scan-
ner unit positioning plate, tighten and fix the setscrew.
(Note)
Allow a clearance of about 0.5mm between the scanner
unit drive pulley and the positioning E-ring.
7)
Manually turn the scanner unit drive gear to bring No.2
scanner 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 scanner unit is properly set.
8)
With No.2 scanner unit being in contact with No.2 scanner
unit positioning plate, and insert the 1.0 mm spacer be-
tween No.1 scanner unit and upper-R frame, bring No.1
scanner unit into contact with upper-R frame, and fix it to
the scanner unit drive wire.
Procedures 1) to 8) are for adjustment of mechanical
horizontal parallelism. No.1 scanner unit and No.2 scanner
unit are fixed to the specified positions and the mechanical
horizontal parallelism of No.2 scanner unit 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 (90%) on an B4 or 14" x 8 1/2"
paper with the document cover open.
No.2 scanner unit
Positioning plate
Scanner unit drive pulley
Do not move
the shaft.
0.5mm
No.1 scanner unit
Upper-right frame
Wire fixing
screw
Wire fixing
screw
1.0mm spacer
50mm
B4 or "11 x 14" size
paper
7 – 10
