Adjustments; Optical Section; A. Copy Magnification Ratio Adjustment - Sharp AR-168S Service Manual

[9] ADJUSTMENTS

1. Optical section

A. Copy magnification ratio adjustment

The copy magnification ratio must be adjusted in the main scanning
direction and in the sub scanning direction. To adjust, use TC 48-01.
(1) Outline
The main scanning (front/rear) direction magnification ratio adjustment
is made manually.
The adjustment is made by manual key operations. (The zoom data
register set value is changed for adjustment.)
The magnification ratio in the sub scanning direction is adjusted by
changing the carriage (scanner) scanning speed.
(2) Main scanning/sub scanning direction magnification
ratio adjustment
a. Cases when the adjustment is required
1) When the main PWB is replaced.
2) When the EEPROM in the main PWB is replaced.
3) When "U2" trouble occurs.
4) When repairing or replacing the optical section.
b. Necessary tools
• Scale
c. Main scanning direction adjustment procedure
1) Set the scale vertically on the document table. (Use a long scale
for precise adjustment.)
2) Set the copy magnification ratio to 100%.
3) Make a copy on A4 or 81/2" x 11" paper.
4) Measure the length of the copied scale image.
5) Calculate the main scanning direction magnification ratio.
Main scanning direction magnification ratio
=
(When a 100mm scale is used as the original.)
Paper feed
direction
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 TC 48-01 to select the main scanning direction copy
magnification ratio adjustment mode.
To select the adjustment mode, use the [ / ] key.
Main scan direction
magnification ratio
OC mode sub scan
direction magnification ratio
8) Enter the new set value of main scanning direction copy
magnification ratio with the copy quantity set key, and press the
[START] key.
9) Change the set value and repeat the adjustment until the ratio is
within the specified range.
When the set value is changed by 1, the magnification ratio is
changed by 0.1%.
d. Sub scanning direction adjustment procedure
1) Set the scale on the document table as shown below. (Use a long
scale for precise adjustment.)
AR-168S/168D ADJUSTMENTS 9 - 1
Copy image dimensions
X 100 (%)
Original dimension
mm
10 20 100 110
1/2mm
mm
10 20 100 110
1/2mm
Reference Comparison point
Display
Mode
item
F-R
SCAN
Original (Scale)
HARDENED
STAINLESS
JAPAN
150
120 130 140
Shizuoka
HARDENED
STAINLESS
JAPAN
120 130 140 150
Shizuoka
Copy
110
Default
LED
value
50 PRINT mode lamp
50 SCAN mode lamp