Sharp SF-2314 Service Manual page 72

VII. Troubles caused by improper adjustment
(6) Copy magnification ratio adjustment
The copy magnification ratio adjustment must be performed in the
vertical direction and in the horizontal direction.
In addition, the horizontal copy magnification ratio adjustment must
be performed both in the document table mode and in the SPF mode.
Firstly perform the vertical copy magnification ratio adjustment, then
perform the horizontal copy magnification ratio adjustment.
a. Vertical copy magnification ratio adjustment (Normal
copy)
I. Summary
The vertical copy magnification ratio adjustment must be per-
formed in the normal (100%) copy mode and in the zoom copy
mode.
In the normal (100%) copy mode, the lens home position is
changed voluntarily with simulations 48-1 to adjust the vertical
copy magnification ratio.
In the zoom copy mode, the lens shift ratio is changed with
simulations 48-1 according to the lens home position set with
simulations 48-1 to adjust the zoom copy magnification ratio.
The vertical copy magnification ratio adjusted in this procedure
is used for the horizontal copy magnification ratio adjustment.
II. Purpose
The purpose of this adjustment is to fit the displayed copy mag-
nification ratio with the actual copy image size.
III. Note
Before performing this adjustment, the following adjustments
must have been completed. If not, this adjustment cannot be
performed properly.
* Image distortion adjustment
* Focus adjustment
Firstly adjust the vertical magnification ratio in the normal
(100%) copy mode, then adjust in the zoom copy mode. Never
reverse the sequence.
The vertical magnification ratio adjustment in the zoom copy
mode must be performed when the vertical magnification ratio in
the normal (100%) copy mode is proper but the copy size is not
proper in the zoom copy mode.
The vertical magnification ratio adjustment must be performed in
advance to the horizontal copy magnification ratio adjustment.
Never reverse the sequence. (The horizontal copy magnification
ratio is based on the vertical copy magnification ratio.)
IV. Cases when the adjustment is required
1) When the lens and the mirror unit are disassembled or the
part is replaced.
2) When the scanner unit drive section is disassembled or the
part is replaced.
3) When the main PWB is replaced.
4) When the RAM in the main PWB is replaced.
5) When "U2" trouble occurs.
6) When the position of the lens home position sensor is
changed.
7) When the lens home position sensor is replaced.
8) When the copy image distortion adjustment is performed.
9) When the center position of copy image is adjusted.
10) When the focus is adjusted.
V. Necessary tools
* Screwdriver (+)
* Scale
VI. Adjustment procedure
(Normal (100%) copy mode: Vertical copy magnification ratio
adjustment)
1) Set the scale vertically on the document table. (Use a long
scale for precise adjustment.)
Scale
2) Set the copy magnification ratio to 100%.
3) Make a copy on A3 or 11" x 17" paper.
4) Measure the length of the copied scale image.
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