Sharp AL-1611 Service Manual page 33

6) Put No. 2/3 mirror base unit on the positioning plate again, push the
projections on the front frame side and the rear frame side of the
copy lamp unit to the corner frame, and tighten the wire fixing
screw.
(3) Main scanning direction (FR direction) distortion
adjustment
This adjustment must be performed in the following cases:
• When the mirror base drive wire is replaced.
• When the lamp unit, or No. 2/3 mirror holder is replaced.
• When a copy as shown is made.
La
1) Set A3 (11" x 17") white paper on the original table as shown below.
2) Open the original cover and make a normal (100%) copy.
3) Measure the width of the black background at the lead edge and at
the rear edge.
If the width (La) of the black background at the lead edge is equal
that (Lb) at the rear edge, there is no need to execute the following
procedures of 4) ~ 7).
4) Loosen the mirror base drive pulley fixing screw on the front frame
side or on the rear frame side.
• When La < Lb
Turn the mirror base drive pulley on the front frame side in the arrow
direction A. (Do not move the mirror base drive pulley shaft.)
• When La > Lb
Turn the mirror base drive pulley on the front frame side in the arrow
direction A. (Do not move the mirror base drive pulley shaft.)
Front side
Lb
5) Tighten the mirror base drive pulley fixing screw.
<Adjustment specification>
La = Lb
6) Execute the main scanning direction (FR) distartion balance adjust-
ment previously described in 2) again.
AL-1611/AL-1622 ADJUSTMENTS
7 – 6
Rear side
A
B