Sharp MX-6500N / MX-7500N (serv.man19) Service Manual ▷ View online
MX-7500N ADJUSTMENTS AND SETTINGS 5 – 13
3)
The display shows the tray select screen for printing the DSPF
adjustment pattern. Select a tray for DSPF adjustment printing.
adjustment pattern. Select a tray for DSPF adjustment printing.
4)
Self-print of the DSPF adjustment pattern is performed.
5)
After completion of printing, the DSPF adjustment start screen
is displayed.
is displayed.
6)
Load the DSPF adjustment pattern on the DSPF.
7)
Press [EXECUTE] key, and scanning of the DSPF adjustment
pattern selected in step 2) is started.
pattern selected in step 2) is started.
8)
When [ALL] is selected, load the DSPF adjustment pattern on
the DSPF again, and perform the adjustment of the back sur-
face in the similar procedures.
the DSPF again, and perform the adjustment of the back sur-
face in the similar procedures.
9)
The adjustment result screen is displayed.
The value of this time is displayed, and the value of the last
time is displayed in the parenthesis ( ).
time is displayed in the parenthesis ( ).
* When [REPRINT] button is pressed, the display returns to
the cassette select screen to allow self-print of the DSPF
adjustment pattern (front, back) again.
adjustment pattern (front, back) again.
* When [RESCAN] button is pressed, the DSPF adjustment
pattern (front, back) is scanned again.
* When [RETRY] button is pressed, the adjustment value is
not saved in EEPROM and RAM and shifted to the top menu
screen.
screen.
* When [DATA] button is pressed, the data used in execution
of the adjustment are displayed.
10) When [OK] button is pressed, the adjustment value is saved in
EEPROM and RAM and the display is shifted to the end
screen.
screen.
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MX-7500N ADJUSTMENTS AND SETTINGS 5 – 14
ADJ 4
Print engine image distortion
adjustment / OPC drum phase
adjustment / Color registration
adjustment
(Print engine section)
adjustment / OPC drum phase
adjustment / Color registration
adjustment
(Print engine section)
This adjustment must be performed in the following cases:
* When the color shift occurs.
* When the LSU is replaced.
* When the LSU is removed from the main unit.
* When the unit is installed or when the installing place is changed.
* When maintenance work is performed. (Replacement of the
OPC drum, the OPC cartridge, the transfer unit, the transfer belt,
etc.)
etc.)
* When [ADJ3A] / [ADJ15A] Print engine image magnification ratio
adjustment (BK) (main scanning direction) is performed.
* U2 trouble has occurred.
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
* When the color phase is not proper even after execution of the
color balance adjustment.
* When the OPC drum drive section is disassembled.
* When the primary transfer unit is replaced. (when it is removed
from the machine)
* When the developing unit or the OPC drum unit is removed from
the machine.
4-A
Print engine image distortion adjustment
(Auto adjustment) / OPC drum phase
adjustment (Automatic adjustment) /
Color registration adjustment
(Automatic adjustment)
(Auto adjustment) / OPC drum phase
adjustment (Automatic adjustment) /
Color registration adjustment
(Automatic adjustment)
This adjustment performs the print engine image distortion adjust-
ment, the OPC drum phase adjustment, and the color registration
adjustment simultaneously.
ment, the OPC drum phase adjustment, and the color registration
adjustment simultaneously.
1)
Enter SIM50-22 mode.
2)
Press [EXECUTE] key.
[EXECUTE] key is highlighted and the image registration auto-
matic adjustment is started. (It takes about 15 sec to complete
the adjustment.)
matic adjustment is started. (It takes about 15 sec to complete
the adjustment.)
3)
When the adjustment is completed, [EXECUTE] key returns to
the normal display, and the value of the adjustment result is
displayed.
the normal display, and the value of the adjustment result is
displayed.
The current skew level for each color is displayed on the
SKEW display section.
SKEW display section.
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Display/Item
Content
Display
NOTE
MAIN F
C
Registration adjustment value main scanning direction
(Cyan laser writing position F side)
(Cyan laser writing position F side)
1.0 - 399.0
Same item with SIM50-20.
* However, the adjustment accuracy is in the unit of +/-0.1dot.
* However, the adjustment accuracy is in the unit of +/-0.1dot.
M
Registration adjustment value main scanning direction
(Magenta laser writing position F side)
(Magenta laser writing position F side)
1.0 - 399.0
Y
Registration adjustment value main scanning direction
(Yellow laser writing position F side)
(Yellow laser writing position F side)
1.0 - 399.0
MAIN R
C
Registration adjustment value main scanning direction
(Cyan laser writing position R side)
(Cyan laser writing position R side)
1.0 - 399.0
M
Registration adjustment value main scanning direction
(Magenta laser writing position R side)
(Magenta laser writing position R side)
1.0 - 399.0
Y
Registration adjustment value main scanning direction
(Yellow laser writing position R side)
(Yellow laser writing position R side)
1.0 - 399.0
SUB
C
Registration adjustment value sub scanning direction
(Cyan drum to Black drum)
(Cyan drum to Black drum)
1.0 - 399.0
M
Registration adjustment value sub scanning direction
(Magenta drum to Black drum)
(Magenta drum to Black drum)
1.0 - 399.0
Y
Registration adjustment value sub scanning direction
(Yellow drum to Black drum)
(Yellow drum to Black drum)
1.0 - 399.0
SKEW
C
Print skew amount calculation result (Cyan)
L99.9 - R99.9
If the value is positive (+), "L" is displayed at the head of the
value. If negative (-), "R" is displayed.
If the value is in the range of -1.0 - +1.0, "(OK)" is displayed at
the bottom of the value. In the other cases, "(NG)" is displayed.
value. If negative (-), "R" is displayed.
If the value is in the range of -1.0 - +1.0, "(OK)" is displayed at
the bottom of the value. In the other cases, "(NG)" is displayed.
M
Print skew amount calculation result (Magenta)
L99.9 - R99.9
Y
Print skew amount calculation result (Yellow)
L99.9 - R99.9
ALL_ROTATE
Print skew amount calculation result (Overall)
L99.9 - R99.9
If the value is positive (+), "L" is displayed at the head of the
value. If negative (-), "R" is displayed.
If the value is in the range of -23.6 - +23.6, "(OK)" is displayed at
the bottom of the value. In the other cases, "(NG)" is displayed.
value. If negative (-), "R" is displayed.
If the value is in the range of -23.6 - +23.6, "(OK)" is displayed at
the bottom of the value. In the other cases, "(NG)" is displayed.
START
Modulation control start position
(
(
): Previous value
0 - 71
AMP1
Modulation control amplitude
(
(
): Previous value
0 - 12.0
AMP2
Modulation control amplitude
(
(
): Previous value
0 - 12.0
PHASE1
Modulation control amplitude
(
(
): Previous value
0 - 12.0
PHASE2
Modulation control amplitude
(
(
): Previous value
0 - 12.0
PHASE/K
Modulation control amplitude
(
(
): Previous value
0 - 12.0
MX-7500N ADJUSTMENTS AND SETTINGS 5 – 15
4)
Check the displayed skew level.
It is not necessary to adjust if all of "ALL_ROTATE
SKEW_C,M,Y" are displayed "OK".
SKEW_C,M,Y" are displayed "OK".
If "NG" is displayed, write down the skew level.
* There's a possibility that "NG" is displayed by adjustment
variety,
* There's a possibility "NG" is displayed by adjustment variety,
if NG is displayed, retry procedure 1) to 3) several times.
5)
If "ALL ROTATE" is "NG"
Check if the installation of registration sensor on LSU unit is
good.
good.
If there's no problem at the installation, execute ADJ4-B to
adjust the black image skew.
adjust the black image skew.
Retry proceure 1) to 4).
* Even if the result of ADJ4-B is OK, there's a possibility to dis-
play "ALL_ROTATE" NG.
play "ALL_ROTATE" NG.
* In case above, because it does not become the problem in
true use, it is all right even if NG is displayed..
true use, it is all right even if NG is displayed..
6)
If "SKEW" is NG.
Enter the Sim61-4 mode.
Check the value of skew of the color which is displayed NG at
procecedure 4).
procecedure 4).
If the value of SKEW is near the limit (1 or 50).
Change the value according to the value which was written in
the procedure 4) and press OK.
the procedure 4) and press OK.
Retry procedure 1) to 4) and check if the result is OK.
* To have changed the K_SKEW value, there's a possibility
the result is NG.
the result is NG.
* The adjustment value needs to be determined by checking
"ALL ROTATE" and "SKEW" value.
"ALL ROTATE" and "SKEW" value.
If the value of SKEW is not near the limit (1 or 50).
Press [SKEW_CHK] Key and check if the adjustment motor
operate normally.
operate normally.
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.
* ADJ4-A needs to be done before this adjustment.
1)
Enter the SIM 61-4 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.
Diagonal
A
B
Diagonal
About
220mm
Diagonal
Line
D
Line
C
About
300mm
MX-7500N ADJUSTMENTS AND SETTINGS 5 – 16
5)
Enter K_SKEW value and press [EXECUTE] key.
Reference adjustment value.
In case Method 1
C-D = 0.1mm/+/-3
In case Method 2
If there's skew in A direction; 0.1mm/+/-5
If there's skew in B direction; 0.1mm/+/-5
NOTE: If "K_SKEW" value is changed too much, there's a possibil-
ity that the color image skew can't be adjusted.
6)
The image skew (image registration) adjustment pattern is
printed.
printed.
Repeat the procedures 4) to 5) until a satisfactory result is
obtained.
obtained.
7)
If a satisfactory result of black image skew was obtained, Enter
the SIM55-22 mode and try ADJ4-A.
the SIM55-22 mode and try ADJ4-A.
8)
To check the color image skew, repeat the procedre 1) to 3)
and print the image skew (image registration) .
and print the image skew (image registration) .
9)
Check the scale value of the most high density position of
image skew (image registration) adjustment pattern and adjust
the difference between F side and R side.
image skew (image registration) adjustment pattern and adjust
the difference between F side and R side.
The reference of adjustment amount : (pattern R value) - (pat-
tern F value).
tern F value).
Kinds of adjustment values
There are following two kinds of registration adjustment val-
ues.
ues.
Base registration adjustment value;
XXX(FRONT)/XXX(REAR)
They are manual adjustment values and automatic adjustment
values, and reflected when the automatic registration adjust-
ment is executed.
values, and reflected when the automatic registration adjust-
ment is executed.
It varies for every operation of the automatic registration
adjustment.
adjustment.
NOTE: To keep the manual correction value, SIM44-1 [AR_AUTO]
needs to be set "prohibition setting".
Offset adjustment values;
OFFSET_SKEW_K/C/M/Y
This is the correction value for auto adjustment result and
when the auto adjustment is done, the values are held.
when the auto adjustment is done, the values are held.
(Fixed correction values will be added toward the auto adjust-
ment values each time)
ment values each time)
NOTE: Normally, execute this manual adjustment.
10) Input the adjustment values and press the [EXECUTE] Key.
11) The image skew (image registration) adjustment pattern is
printed.
Repeat the procedures 9) to 10) until a satisfactory result is
obtained.
obtained.
4-C
Color registration offset adjustment
(No need to adjust normally)
(No need to adjust normally)
This adjustment is used to set the offset value for the automatic
color registration adjustment (ADJ4A).
color registration adjustment (ADJ4A).
If there is any difference in color phase at the center and the four
corners of an actual print image, this adjustment may improve it.
Especially when there is any color shift at the center area, this
adjustment may improve it effectively.
corners of an actual print image, this adjustment may improve it.
Especially when there is any color shift at the center area, this
adjustment may improve it effectively.
This adjustment cannot eliminate color shifts in all the areas, but
average the overall color shifts.
average the overall color shifts.
After the automatic adjustment, use this color registration offset
adjustment to correct color shift partially, performing the adjustment
efficiently.
adjustment to correct color shift partially, performing the adjustment
efficiently.
NOTE:Before execution of this adjustment, check to confirm that
the ADJ4A has been properly made.
the ADJ4A has been properly made.
[Kinds of adjustment values]
There are following two kinds of registration adjustment values.
- Base registration adjustment value: XXX(FRONT)/XXX(REAR)/
XXX(SUB)
They are manual adjustment values and automatic adjustment
values, and reflected when the automatic registration adjustment
is executed. It varies for every operation of the automatic regis-
tration adjustment.
values, and reflected when the automatic registration adjustment
is executed. It varies for every operation of the automatic regis-
tration adjustment.
To keep the manual correction value, SIM44-1 [AR_AUTO]
needs to be set "prohibition setting".
needs to be set "prohibition setting".
- Offset adjustment values: OFFSET_*_F/R/S
This is the offset value whici is added to the base adjustment
value above, and they aren't changed unless thsy are adjusted in
SIM50-20.
value above, and they aren't changed unless thsy are adjusted in
SIM50-20.
1)
Enter SIM50-20 mode.
2)
Select the paper feed tray with A3 (11" x 17") paper in it.
3)
Press [EXECUTE] key.
The color image registration check pattern is printed.
4)
Check the color image registration.
There are 6 color image registration patterns in total; two on
each of the F side, the R side, and the center and adjust them
checking each pattern.
each of the F side, the R side, and the center and adjust them
checking each pattern.
The vertical direction in the above figure is that in the main
scanning direction, and the horizontal direction is that in the
sub scanning direction.
scanning direction, and the horizontal direction is that in the
sub scanning direction.
These are each adjustment values and the check pattern for
check.
check.
.
SKEW
adjustmentpatternR
j
p
SKEW
adjustmentpatternF
Rear
pattern 㻝
㻾㼑㼍㼞 㼜㼍㼠㼠㼑㼞㼚 㻞
Center pattern
㻝
㻯㼑㼚㼠㼑㼞 㼜㼍㼠㼠㼑㼞㼚 㻞
㻿㼁㻮
㼐㼕㼞㼑㼏㼠㼕㼛㼚
㼐㼕㼞㼑㼏㼠㼕㼛㼚
㻹㻭㻵㻺 㼐㼕㼞㼑㼏㼠㼕㼛㼚
Front
pattern㻝
Center
pattern㻝
㻯㼑㼚㼠㼑㼞㻌㼜㼍㼠㼠㼑㼞㼚 㻞
㻲㼞㼛㼚㼠㻌㼜㼍㼠㼠㼑㼞㼚 㻞
Click on the first or last page to see other MX-6500N / MX-7500N (serv.man19) service manuals if exist.