Read Sharp MX-1800N (serv.man14) Service Manual online
MX-1800N ADJUSTMENTS 6 – 10
ADJ 6
Image skew adjustment (LSU
unit)
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.
* 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
* When the primary transfer unit is replaced.
* When the color phase is not matched by the color balance
adjustment.
1) Enter SIM61-4 mode.
2) Select the paper feed tray with A3 (11 x 17) paper in it by
changing the value of set item B.
3) Touch [EXECUTE] key.
The check pattern is printed out.
4) Check the printed black image for any skew (right angle).
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.
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.
Method 2: Use the right angle sides of A3 or 11 x 8.5 paper for
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
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.
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.
there is no need to adjust.
(Method 2)
a) Fit the three cross points of the cross patterns in a row with
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).
(right angle).
b) Measure the shortest distance between the cross pattern
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 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.
EXECUTE
EXECUTE
CLOSE
0
A:
Aȇxxx
Ȉ
MULTICOUNT
Bȇ x
Ȉ
PAPERȇCS1
SIMULATIONġ NO.61-04
LSU POSITION ADJUSTMENT (SELF PRINT)
xxx
1
999
OK
TEST
EXECUTE
0
SIMULATION NO.61-04
OK
TEST
CLOSE
EXECUTE
A:
Aȇxxx
Ȉ
MULTICOUNT
Bȇ x
Ȉ
PAPERȇCS1
LSU POSITION ADJUSTMENT (SELF PRINT)
2
1 999
10-key
or end of print
R
F
Comparison line
0.5 mm or less
Direction A
Direction B
Reference line
R
F
Diagonal line D
Diagonal line C
Direction A
Direction B
R
F
Comparison line
A3 or 11 x 8.5 paper
The cross patterns in a row
Reference line
0.5 mm or less
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