Adjustments - Sharp AL-1215 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 SIM 48-1.
(1) Outline
The main scanning (front/rear) direction magnification ratio adjustment
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 scanning
(front/rear) direction magnification ratio adjustment automatically.
Manual adjustment: The adjustment is made by manual key
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 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 simulation
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.
Main scanning direction auto copy
magnification ratio adjustment
Main scanning direction manual copy
magnification ratio adjustment
Sub scanning direction copy
magnification ratio adjustment
SPF mode scanning direction
magnification ratio adjustment
8) Set the adjustment mode to Manual with the copy mode select key.
9) Enter the new set value of main scanning direction copy
magnification 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 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-1551CS 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
Adjustment mode
Auto exposure lamp ON
Manual exposure lamp ON
Photo exposure lamp ON
Auto, Manual, Photo lamp
ON
Original (Scale)
HARDENED
STAINLESS
150
130 140
Shizuoka
HARDENED
STAINLESS
130 140 150
Shizuoka
Copy
110
Lighting lamp