Image Skew Adjustment (Lsu Unit) - Sharp MX-2300 G Service Manual

: Jan. 15 2006
2
6

Image skew adjustment (LSU unit)

This adjustment must be executed in the following cases:
* When the LSU (writing) unit is replaced.
* When the LSU (writing) unit is removed from the main unit.
* When a color image registration mistake occurs.
* When the unit is installed or when the installing site is changed.
(Required depending on the cases.)
* When there is an uneven density area or a difference in color
balance in the main scanning direction (back and forth).
* When the OPC drum drive unit is replaced.
* When the primary transfer unit is replaced.
* When the color phase is not matched by the color balance
adjustment.
1) Enter SIM61-4 mode.
SIMULATION NO.61-04
TEST
LSU POSITION ADJUSTMENT (SELF PRINT)
A xxx
A:
xxx
B x
1 999
10-key
EXECUTE
SIMULATION NO.61-04
TEST
LSU POSITION ADJUSTMENT (SELF PRINT)
A xxx
A:
2
B x
1 999
2) Select the paper feed tray with A3 (11 x 17) paper in it by
changing the value of set item B.
3) Press [EXECUTE] key.
The check pattern is printed out.
Comparison line
0.5 mm or less
Direction A Direction B
Reference line
4) Check the printed black image for any skew (right angle).
2
Measure the right angle level by using the six cross patterns
printed in black.
There are following two methods of checking the black image
for any skew (right angle).
Method 1: Measure the length of the diagonal lines from the
cross point of the cross pattern. Check the difference in the
length of the diagonal lines for judgment of good or no good.
0
CLOSE
MULTICOUNT
PAPER CS1
EXECUTE OK
EXECUTE
or end of print
0
CLOSE
MULTICOUNT
PAPER CS1
EXECUTE OK
MX-2300/2700 N/G ADJUSTMENTS 6 – 10
Method 2: Use the right angle sides of A3 or 11 x 8.5 paper for
2
judgment of good or no good.
NOTE:
IN the case of Method 2, the right angle of paper to be used
may not be exact. Be sure to check the right angle of paper to
be used in advance.
(Method 1)
a) Measure the length of the diagonal lines from the cross
point of the outside cross pattern.
Diagonal line D
Diagonal line C
b) Calculate the difference between the measured lengths C
and D of the diagonal lines.
c) Check to insure that the difference between C and D is in
the following range.
C – D = ± 0.8mm
If the difference between C and D is in the above range,
there is no need to adjust.
(Method 2)
a) Fit the three cross points of the cross patterns in a row with
the side of A3 or 11 x 8.5 paper for checking for any skew
(right angle).
Comparison line
0.5 mm or less
Direction A Direction B
R
Reference line
b) Measure the shortest distance between the cross pattern
F
on the extended line of the vertical line and the paper side.
If the above distance is 0.5mm or less, there is no need to
adjust.
If not, execute the following procedures.
5) Open the front cabinet, and remove the waste toner box.
A3 or 11 x 8.5 paper
The cross patterns in a row
R
F
R
F