Read Sharp MX-6240N / MX-7040N (serv.man24) Service Manual online
MX-7040N ADJUSTMENTS AND SETTINGS 5 – 16
6)
Repeat the procedures 2) to 4) again, and check to confirm
that C, M, and Y (SKEW) are OK.
that C, M, and Y (SKEW) are OK.
If any of them is NG, turn the LSU skew adjustment screw of
the corresponding color to adjust.
the corresponding color to adjust.
CAUTION: When the adjustment is made by turning the LSU skew
adjustment screw of K, the states of C, M and Y
(SKEW) are changed. Execute SIM50-22 to check to
confirm that C, M, and Y (SKEW) are OK.
(SKEW) are changed. Execute SIM50-22 to check to
confirm that C, M, and Y (SKEW) are OK.
When an abnormality occurs, "ERROR" is displayed.
In this case, check each drive section and the process
section.
section.
The adjustment result can be checked by the following manual
adjustment mode.
adjustment mode.
* ADJ4B
Image skew adjustment (Manual adjustment) (SIM50-20)
* ADJ4C
Color registration offset adjustment (SIM50-20)
NOTE: When the color registration is greatly shifted due to
replacement of the LSU, etc, if SIM50-22 is used to per-
form the color registration automatic adjustment, an error
may occur.
form the color registration automatic adjustment, an error
may occur.
In this case, the adjustment may be properly executed by
setting the adjustment items A - I of SIM50-20 to "200" and
executing the automatic adjustment again.
setting the adjustment items A - I of SIM50-20 to "200" and
executing the automatic adjustment again.
If color shift in an actual print image differs in the center, the
front side, and the rear side, the color shift offset adjust-
ment can improve it. (Refer to ADJ4C.)
front side, and the rear side, the color shift offset adjust-
ment can improve it. (Refer to ADJ4C.)
Normally there is a difference in color shift in several dots.
Perform the adjustment only when the adjustment is
required.
Perform the adjustment only when the adjustment is
required.
4-B
Print engine image skew (LSU skew)
adjustment (Manual adjustment)
(No need to adjust normally)
adjustment (Manual adjustment)
(No need to adjust normally)
If a more accurate adjustment than the automatic adjustment
ADJ4A is required, use this method of adjustment.
ADJ4A is required, use this method of adjustment.
This adjustment is made by changing the parallelism of the LSU
unit scan laser beams for the OPC drum.
unit scan laser beams for the OPC drum.
1)
Enter the SIM 50-20 mode.
2)
Select the paper feed tray with A3 (11" x 17") paper in it, and
press [EXECUTE] key.
press [EXECUTE] key.
3)
The image skew (image registration) adjustment pattern is
printed.
printed.
4)
Check the printed black image for any skew.
Use the four cross points printed in black to measure the
squareness.
squareness.
There are following two methods of checking the black image
for any skew (right angle).
for any skew (right angle).
Method 1
Measure the distances between opposing corners of the rect-
angle print pattern, and compare the two distances to check
the squareness.
angle print pattern, and compare the two distances to check
the squareness.
Method 2
Check the squareness of the vertical and horizontal sides of
the rectangle print pattern by using A3 or 11" x 17" paper
sides.
the rectangle print pattern by using A3 or 11" x 17" paper
sides.
CAUTION: 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.
of paper to be used in advance.
Method 1
Measure the length of the diagonal lines of the rectangle print
pattern.
pattern.
Calculate the difference between the measured lengths C and
D of the diagonal lines.
D of the diagonal lines.
Check to insure that the difference between C and D is in the
following range.
following range.
C - D = 0.8mm
If the difference between C and D is in the above range, there
is no need to adjust.
is no need to adjust.
Method 2
Fit the side of A3 or 11" x 17" paper to the long side of the rect-
angle print pattern.
angle print pattern.
Measure the slant (skew) of the vertical side for the horizontal
side of paper as shown in the figure.
side of paper as shown in the figure.
If the above distance is 0.5mm or less, there is no need to
adjust.
adjust.
If the above condition is not satisfied, perform the following
procedure.
procedure.
A
B
About
220mm
About 300mm
Diagonal
line D
line D
Diagonal
line C
line C
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