Sharp AR-F152, Service Manual

Page: 82 / 170

4) Measure the length of the copied scale image. 5) Calculate the main scanning direction magnification ratio.
Main scanning direction magnification ratio
=
Copy image dimensions
Original dimension
×
100 (%)
100 110 120 130
150
140
mm
1/2mm
JAPAN
HARDDENCD
STAINLESS
Shizuoka
100 110 120 130
150
140
mm
1/2mm
JAPAN
HARDDENCD
STAINLESS
Shizuoka
110
10 20
10
20
(When a 100mm scale is used as the original.)
Paper feed
direction
Reference Comparison point
Original (Scale)
Copy
6) Check that the copy magnification ratio is within the specified
range. If it is not within the specified range, perform the following
procedures.
7) Execute SIM 48-1 to select the main scanning direction copy
magnification ratio adjustment mode.
To select the adjustment mode, use the copy mode select key.
In the case of the automatic adjustment, when the PRINT switch is
pressed, the mirror base unit moves to the white plate for shading
to scan the width of the reference line, calculating the correction
value and displaying and storing this value.
After execution of the automatic adjustment, go out from the simula-
tion mode and make a copy to check the magnification ratio.
If the magnification ratio is not in the specified range (100
±
1.0%),
manually adjust as follows.
Adjustment mode Lighting lamp
Main scanning direction auto
copy magnification ratio
adjustment
Auto exposure lamp
ON
Main scanning direction manual
copy magnification ratio
adjustment
Manual exposure lamp
ON
Sub scanning direction copy
magnification ratio adjustment Photo exposure lamp
ON
8) Set the adjustment mode to Manual with the copy mode select
key.
9) Enter the new set value of main scanning direction copy mag-
nification ratio with the copy quantity set key, and press the
COPY button.
10) Change the set value and repeat the adjustment until the ratio
is within the speoified range.
When the set value is changed by 1, the magnification ratio is
changed by 0.1%.
(3) Sub scanning direction copy magnification ratio
a. Note
Before performing this adjustment, the following adjustments must
have been completed. If not, this adjustment cannot be performed
properly.
●
Image distortion adjustment
●
Must be installed to the lens unit reference position.
b. 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 EEPROM in the main PWB is replaced.
5) When “U2” trouble occurs.
6) When the copy image distortion adjustment is performed.
c. Necessary tools
●
Screwdriver (+)
●
Scale
d. Adjustment procedure
1) Set the scale on the document table as shown below. (Use a
long scale for precise adjustment.)
2) Set the copy magnification ratio to 100%.
3) Make a copy on A4 or 8 1
⁄
2
″ ×
11
″
paper.
4) Measure the length of the copied scale image.
5) Calculate the sub scanning direction copy magnification ratio.
Sub scanning direction copy magnification ratio
=
Copy image dimension
Original dimension
×
100 (%)
AR-F152
8 – 5