Sharp SF-1014 Service Manual page 61

10) Check the horizontal image distortion.
If LL = LR, there is no horizontal distortion.
LL and LR = Distance
LL
11) If LL is not equal to LR, perform the following procedure.
Loosen the setscrew of the scanner unit drive pulley in the
front or the rear frame.
Scanner unit drive pulley
12) Without moving the scanner unit drive pulley shaft, manual-
ly turn the scanner unit drive pulley whose setscrew was
loosened, and adjust the parallelism of No.1 and No.2
scanner units.
Do not move the shaft.
Scanner unit drive pulley
13) Tighten the set screw of the scanner unit drive pulley.
14) Check the image distortion in the same manner as step
10).
Repeat procedures 11) to 14) until horizontal image distor-
tion is eliminated.
VII. Troubles caused by improper adjustment
between the
horizontal line and the outer edge
of the black background
LR
Black background
Set screw
No.2
scanner
unit.
No.1
scanner
unit
b. Vertical image distortion adjustment
I. Summary
copy
This adjustment is to adjust parallelism of the vertical optical axis
of the copier and that of each mirror to eliminate vertical image
distortion.
For adjusting vertical image distortion, the overall adjustment
and the right-left balance adjustment must be performed inde-
pendently.
The overall adjustment is performed by changing the height of
No.4/5 mirror unit in the front frame side. The right-left balance
adjustment is performed by changing the right-left balance of
No.2 scanner unit rail.
The right-left balance adjustment must be performed in advance
to the overall adjustment.
II. Purpose
The purpose of this adjustment is to set parallelism of the verti-
cal optical axis of the copier and that of No.4/5 mirror unit and
No.2 mirror unit to eliminate vertical image distortion.
III. Note
Before performing this adjustment, the following adjustments
must have been completed.
If not, this adjustment cannot be performed properly.
* The lens unit right angle adjustment
* No.4/5 mirror unit right angle adjustment
* Horizontal image distortion adjustment
IV. Cases when the adjustment is required
1) When No.4/5 mirror unit is disassembled or its part is
replaced.
2) When the scanner unit drive section is disassembled or its
part is replaced.
3) When the copy image is distorted as follows:
Document
V. Necessary tools
* Screwdriver (+)
* Screwdriver (–)
* Scale
* Test chart for distortion adjustment (Make by yourself.)
Draw a rectangle on A4 or 8 1/2" x 11" paper as shown
below:
Be sure to make four right angles.
L
7 – 11
Copy C Copy D
L
L
L = 10mm
L