Adjustments; Optical Section; Copy Magnification Ratio Adjustment - Sharp AL-2051 Service Manual

[9] ADJUSTMENTS

1. Optical section

A. Copy magnification ratio adjustment
The copy magnification ratio must be adjusted in the main scan-
ning direction and in the sub scanning direction. To adjust, use
SIM 48-1.
(1) Outline
The main scanning (front/rear) direction magnification ratio adjust-
ment is made automatically or manually.
Automatic adjustment: The width of the reference line marked on
the shading correction plate is scanned to perform the main scan-
ning (front/rear) direction magnification ratio adjustment automati-
cally.
Manual adjustment: The adjustment is made by [Numeric] keys
operations. (In either of the automatic and manual adjustments, 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 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
• Screwdriver (+)
• Scale
c. 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
Copy image dimensions
=
(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 follow-
ing procedures.
7) Execute SIM 48-1 to select the main scanning direction copy
magnification ratio adjustment mode.
To select the adjustment mode, use the [
In the case of the automatic adjustment, when the START 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 simu-
lation 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
Main scan direction
magnification ratio
OC mode sub scan
direction magnification ratio
8) Enter the new set value of main scanning direction copy magni-
fication ratio with the [Numeric] 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%.
(3) Sub scanning direction copy magnification ratio
a. Cases when the adjustment is required
1) When the scanner unit drive section is disassembled or the part
is replaced.
2) When the main PWB is replaced.
3) When the EEPROM in the main PWB is replaced.
4) When "U2" trouble occurs.
b. Necessary tools
• Scale
AL-2051 ADJUSTMENTS 9 - 1
X 100 (%)
Original dimension
JAPAN
mm
10 20 100 110 120
1/2mm
JAPAN
mm
10 20 100 110 120
1/2mm
Reference Comparison point
Display
item
F-R PRINT mode lamp
SCAN SCAN mode lamp
Original (Scale)
HARDENED
STAINLESS
150
130 140
Shizuoka
HARDENED
STAINLESS
150
130 140
Shizuoka
Copy
110
] [ ] key.
LED Default
50
50