Sharp AL-1043, Service Manual

Page: 71 / 126

AL-1551 ADJUSTMENTS 9-7
6) Set the lead edge void amount to B = 50 (2.5mm).
When the value of B is increased by 10, the void amount is increased
by about 1mm. For 25 or less, however, the void amount becomes
zero. (Default: 50)
(2) Image rear edge void amount adjustment
1) Set a scale to the rear edge section of A4 or 11" x 8 1/2" paper size
as shown in the figure below, and cover it with B4 or 8 1/2" x 14"
paper.
2) Execute SIM 50 - 01 to select the image rear edge void amount
adjustment mode.
The set adjustment value is displayed on the copy quantity display.
3) Make a copy and measure the void amount of image rear edge.
4) If the measurement value is out of the specified range, change the
set value and repeat the adjustment procedure.
The default value is 50.
Note: The rear edge void cannot be checked with the first sheet after
entering the simulation mode, the first sheet after turning off/on the
power, or the first sheet after inserting the cassette. Use the
second or later sheet to check the rear edge void.
(3) Center offset adjustment
1) Set the self-made test chart for the center position adjustment so
that its center line is aligned with the center mark of the document
guide.
• Test chart for the center position adjustment.
Draw a line at the center of A4 or 8 1/2" x 11" paper in the paper
transport direction.
2) Execute SIM 50 - 10 to select the print center offset (cassette paper
feed) adjustment mode.
The set adjustment value is displayed on the copy quantity display.
3) Make a copy and check that the copied center line is properly
positioned.
The standard value is 0 ±2mm from the paper center.
4) If the measured value is out of the specified range, change the set
value and repeat the adjustment procedure.
When the set value is increased by 1, the copy image is shifted by
0.1mm toward the rear frame.
• For the manual paper feed, change the manual paper feed adjustment
mode and perform the similar procedures.
• Since the document center offset is automatically adjusted by the CCD
which scan the reference lines (F/R) on the back of document guide,
there is no need to adjust manually.
5mm
10mm
(Example)
Distance between paper lead
edge and image: H = 5mm
Image loss:
R = 3mm
B4 or 8 1/2
″ ×
14
″
paper
A4 size rear edge
Scale image
Paper rear edge
Void amount (Standard value: 2 3mm)
Document guide
Center
Copy paper
(A4 or 8 1/2
″ ×
11
″
)
(Copy A)
(Copy B)
2.0mm or less
2.0mm or less
Copy image
Copy paper
folding line
Copy image
Copy paper
folding line
Shift
Shift
(Paper feed direction)
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