Sharp MX-M623U / MX-M753U (serv.man10) Service Manual ▷ View online
MX-M753N ADJUSTMENTS AND SETTINGS 5 – 44
ADJ 18
Print engine image position,
image magnification ratio, void
area, off-center adjustment
(manual adjustment)
image magnification ratio, void
area, off-center adjustment
(manual adjustment)
18-A
Print engine image magnification ratio
adjustment (Main scanning direction)
adjustment (Main scanning direction)
This adjustment is needed in the following situations:
* When the LSU (writing) unit is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)
* When the LSU (writing) unit is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)
Enter the SIM 50-10 mode.
2)
Set A4 (11" x 8.5") paper in the paper feed tray.
3)
Select the paper feed tray set in procedure 2) with the scroll
key.
key.
4)
Press [EXECUTE] key.
The check pattern is printed out.
The check pattern is printed out.
5)
Check that the inside dimension of the printed half tone is 240
0.5mm.
0.5mm.
If the above requirement is not met, do the following steps.
6)
Change the set value of set item A.
When the set value is changed by 1, the dimension is changed
by 0.1mm.
When the set value is increased, the BK image magnification
ratio in the main scanning direction is increased. When the set
value is decreased, the BK image magnification ratio in the
main scanning direction is decreased.
When the set value is changed by 1, the dimension is changed
by 0.1mm.
When the set value is increased, the BK image magnification
ratio in the main scanning direction is increased. When the set
value is decreased, the BK image magnification ratio in the
main scanning direction is decreased.
Repeat procedures 2) - 6) until a satisfactory result is obtained.
18-B
Print engine image position adjustment
This adjustment is needed in the following situations:
* When the LSU is replaced or removed.
* When a paper tray is replaced.
* When the paper tray section is disassembled.
* When “Print engine image magnification ratio adjustment (Main
* When the LSU is replaced or removed.
* When a paper tray is replaced.
* When the paper tray section is disassembled.
* When “Print engine image magnification ratio adjustment (Main
scanning direction)” is performed.
* When the manual feed tray is replaced.
* When the manual feed tray is disassembled.
* When the duplex section is disassembled.
* When the duplex section is installed or replaced.
* When the large capacity tray is installed or replaced.
* When the large capacity tray section is disassembled.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
(Note)
Before execution of this adjustment, check to insure the following
item.
* Check that the “Print engine image magnification ratio adjust-
* When the manual feed tray is disassembled.
* When the duplex section is disassembled.
* When the duplex section is installed or replaced.
* When the large capacity tray is installed or replaced.
* When the large capacity tray section is disassembled.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
(Note)
Before execution of this adjustment, check to insure the following
item.
* Check that the “Print engine image magnification ratio adjust-
ment (Main scanning direction)” has been properly adjusted.
1)
Enter SIM 50-10 mode.
EXECUTE
End of print
EXECUTE
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EXECUTE
End of print
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MX-M753N ADJUSTMENTS AND SETTINGS 5 – 45
2)
Use the scroll key to select a paper feed tray which is to be
adjusted. (Items B - M)
adjusted. (Items B - M)
3)
Set A4 (11" x 8.5") paper in the paper feed tray selected in pro-
cedure 2).
cedure 2).
4)
Press [EXECUTE] key.
The adjustment pattern is printed.
The adjustment pattern is printed.
5)
Check the adjustment pattern to confirm that it is as shown
below.
below.
(When the off-center is adjusted)
6)
Change the adjustment value. (Items I - M)
Enter the adjustment value and press the [OK] key or the
[EXECUTE] key.
When [EXECUTE] key is pressed, the adjustment pattern is
printed.
When the adjustment value is increased, the adjustment pat-
tern is shifted to the front frame side. When it is decreased, the
adjustment pattern is shifted to the rear frame side.
When the set value is changed by 1, the shift distance is
changed by about 0.1mm.
In case a satisfactory result cannot be obtained by repeating
the above procedures, perform the following procedure.
Enter the adjustment value and press the [OK] key or the
[EXECUTE] key.
When [EXECUTE] key is pressed, the adjustment pattern is
printed.
When the adjustment value is increased, the adjustment pat-
tern is shifted to the front frame side. When it is decreased, the
adjustment pattern is shifted to the rear frame side.
When the set value is changed by 1, the shift distance is
changed by about 0.1mm.
In case a satisfactory result cannot be obtained by repeating
the above procedures, perform the following procedure.
7)
Loosen the paper feed tray off-center adjustment screws (2
pcs.) at the center section of the lift plate of the paper feed tray,
and change the gear unit position in the front/rear frame direc-
tion. Repeat the adjustment procedures from 4).
pcs.) at the center section of the lift plate of the paper feed tray,
and change the gear unit position in the front/rear frame direc-
tion. Repeat the adjustment procedures from 4).
(When the paper transport direction image position is
adjusted)
adjusted)
8)
Change the adjustment value. (Items B - H)
Enter the adjustment value and press the [OK] key or the
[EXECUTE] key.
When [EXECUTE] key is pressed, the adjustment pattern is
printed.
When the adjustment value is increased, it is shifted to the
right. (It is shifted so that the image is delayed for the paper.)
When the set value is changed by 1, the shift distance is
changed by about 0.1mm.
Enter the adjustment value and press the [OK] key or the
[EXECUTE] key.
When [EXECUTE] key is pressed, the adjustment pattern is
printed.
When the adjustment value is increased, it is shifted to the
right. (It is shifted so that the image is delayed for the paper.)
When the set value is changed by 1, the shift distance is
changed by about 0.1mm.
Item/Display
Content
Setting
range
Default
value
A
BK-MAG
Main scan print
magnification ratio BK
magnification ratio BK
60 - 140
100
B
MAIN-MFT
Print off center adjustment
value (Manual paper feed)
value (Manual paper feed)
1 - 99
50
C
MAIN-CS1
Print off center adjustment
value (Tray 1)
value (Tray 1)
1 - 99
50
D
MAIN-CS2
Print off center adjustment
value (Tray 2)
value (Tray 2)
1 - 99
50
E
MAIN-CS3
Print off center adjustment
value (Tray 3)
value (Tray 3)
1 - 99
50
F
MAIN-CS4
Print off center adjustment
value (Tray 4)
value (Tray 4)
1 - 99
50
G
MAIN-LCC
Print off center adjustment
value (LCC)
value (LCC)
1 - 99
50
H
MAIN-ADU
Print off center adjustment
value (ADU)
NOTE:
value (ADU)
NOTE:
Before execution of this
adjustment check to
insure that the adjustment
items A - G have been
properly adjusted. If not,
this adjustment cannot be
made properly.
adjustment check to
insure that the adjustment
items A - G have been
properly adjusted. If not,
this adjustment cannot be
made properly.
1 - 99
50
I
SUB-MFT
Paper
transport
direction
image
position
adjustment
transport
direction
image
position
adjustment
Manual
paper feed
paper feed
1 - 99
50
J
SUB-CS12
Standard
tray
tray
1 - 99
50
K
SUB-CS34
DESK
1 - 99
50
L
SUB-LCC
LCC
1 - 99
50
M
SUB-ADU
ADU
1 - 99
50
N
MULTI COUNT
Number of print
1 - 999
1
O
PAPER
MFT
Tray selection
Manual
paper feed
paper feed
1 - 6
1
2
(CS1)
CS1
Tray 1
2
CS2
Tray 2
3
CS3
Tray 3
4
CS4
Tray 4
5
LCC
LCC
6
P
DUPLEX
YES
Duplex print
selection
selection
Yes
0 - 1
0
1 (NO)
NO
No
1
Content
Standard adjustment value
X
Lead edge void area
3.0
1.0mm
Y
Rear edge void area
2.0 - 5.0mm
Z1/Z2
FRONT/REAR void area
2.0
2.0mm
X
Y
Z2
2.0
2.0
3.0 1.0mm
2.0 - 5.0mm
Z1
2.0
2.0
2.0mm
2.0mm
MX-M753N ADJUSTMENTS AND SETTINGS 5 – 46
18-C
Print engine print area (void area)
adjustment
adjustment
This adjustment is needed in the following situations:
* When the LSU is replaced or removed.
* When a paper tray is replaced.
* When the paper tray section is disassembled.
* When the manual feed tray is replaced.
* When the manual feed tray is disassembled.
* When the duplex section is disassembled.
* When the duplex section is installed or replaced.
* When the large capacity tray is installed or replaced.
* When the large capacity tray section is disassembled.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
* When “Print engine image magnification ratio adjustment (Main
* When the LSU is replaced or removed.
* When a paper tray is replaced.
* When the paper tray section is disassembled.
* When the manual feed tray is replaced.
* When the manual feed tray is disassembled.
* When the duplex section is disassembled.
* When the duplex section is installed or replaced.
* When the large capacity tray is installed or replaced.
* When the large capacity tray section is disassembled.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
* When “Print engine image magnification ratio adjustment (Main
scanning direction)” is performed.
* When the print engine image position adjustment is performed.
(Note)
Before executing this adjustment, be sure to execute ADJ 3B print
engine image magnification ratio adjustment (Main scanning direc-
tion) in advance.
1)
(Note)
Before executing this adjustment, be sure to execute ADJ 3B print
engine image magnification ratio adjustment (Main scanning direc-
tion) in advance.
1)
Enter the SIM 50-10 mode.
2)
Set A4 (11" x 8.5") paper to all the trays, and select the set
item J with the scroll key. Enter the value corresponding to the
adjustment target paper feed tray.
item J with the scroll key. Enter the value corresponding to the
adjustment target paper feed tray.
3)
Press [EXECUTE] key.
The adjustment pattern is printed.
The adjustment pattern is printed.
4)
Check the adjustment pattern to confirm that the items below
are in the range of the standard values.
are in the range of the standard values.
If the above condition is not satisfied, or if it is set to a desired
condition, execute the simulation 50-1.
(Note) Feed paper from all the paper feed trays to confirm.
condition, execute the simulation 50-1.
(Note) Feed paper from all the paper feed trays to confirm.
5)
Enter the SIM 50-1 mode.
EXECUTE
End of print
EXECUTE
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Content
Standard adjustment value
X
Lead edge void area
3.0
1.0mm
Y
Rear edge void area
2.0 - 5.0mm
Z1/Z2
FRONT/REAR void area
2.0
2.0mm
X
Y
Z2
2.0
2.0
3.0 1.0mm
2.0 - 5.0mm
Z1
2.0
2.0
2.0mm
2.0mm
OK
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MX-M753N ADJUSTMENTS AND SETTINGS 5 – 47
6)
Select the adjustment item I, J, K with the scroll key, and enter
the adjustment value and press [OK] key.
the adjustment value and press [OK] key.
When the adjustment value is increased, the void area is
increased. When the adjustment value is decreased, the void
area is decreased.
When the adjustment value is changed by 1, the void area is
changed by 0.1mm.
increased. When the adjustment value is decreased, the void
area is decreased.
When the adjustment value is changed by 1, the void area is
changed by 0.1mm.
NOTE: The adjustment value and the actual void area are related
as follows:
Adjustment value/10 = Actual void area
Adjustment value/10 = Actual void area
NOTE: When the amount of the rear edge void is different between
each paper feed tray, change the adjustment value of item
N, O, P, Q, R, S, T (DENB-XXX) in SIM50-1 and adjust.
The adjustment item J (DENB) have a effect on the paper
of all paper feed tray.
That is, adjustment value of item N, O, P, Q, R, S, T
(DENB-XXX) fine adjusts to adjustment item J (DENB) for
each paper tray.
N, O, P, Q, R, S, T (DENB-XXX) in SIM50-1 and adjust.
The adjustment item J (DENB) have a effect on the paper
of all paper feed tray.
That is, adjustment value of item N, O, P, Q, R, S, T
(DENB-XXX) fine adjusts to adjustment item J (DENB) for
each paper tray.
After execution of the above, perform procedures 1) - 4) to check
that the void area is within the specified range.
Though the lead edge void area adjustment value is proper, if the
lead edge void area is not within the specified range, change the
adjustment value of RRCB-XXX (item B, C, D, E, F) of SIM 50-1.
that the void area is within the specified range.
Though the lead edge void area adjustment value is proper, if the
lead edge void area is not within the specified range, change the
adjustment value of RRCB-XXX (item B, C, D, E, F) of SIM 50-1.
ADJ 19
Scan image magnification ratio
adjustment
(Manual adjustment)
adjustment
(Manual adjustment)
This manual adjustment is used when the automatic adjustment of
SIM 50-28 cannot obtain a satisfactory result.
This adjustment is needed in the following situations:
* When the copy image magnification ratio in the sub scanning
SIM 50-28 cannot obtain a satisfactory result.
This adjustment is needed in the following situations:
* When the copy image magnification ratio in the sub scanning
direction is not properly adjusted.
* When the scanner motor is replaced.
* When a U2 trouble occurs.
* When the scanner control PWB is replaced.
* When the EEPROM on the scanner control PWB is replaced.
Before this adjustment, the focus adjustment (CCD unit installing
position adjustment) must have been completed.
* When a U2 trouble occurs.
* When the scanner control PWB is replaced.
* When the EEPROM on the scanner control PWB is replaced.
Before this adjustment, the focus adjustment (CCD unit installing
position adjustment) must have been completed.
19-A
Main scanning direction image
magnification ratio adjustment
(Document table mode)
magnification ratio adjustment
(Document table mode)
1)
Place a scale on the document table as shown in the figure
below.
below.
2)
Enter the SIM 48-1 mode.
3)
Make a normal copy and obtain the copy magnification ratio.
Press [CLOSE] key to shift from the simulation mode to the
copy mode, and make a copy.
Press [CLOSE] key to shift from the simulation mode to the
copy mode, and make a copy.
4)
Check that the copy magnification ratio is within the specified
range (100
range (100
1.0%).
If the copy magnification ratio is within the specified range (100
1.0%), the adjustment is completed. If the copy magnification
ratio is not within the specified range, perform the following
procedure.
1.0%), the adjustment is completed. If the copy magnification
ratio is not within the specified range, perform the following
procedure.
5)
Change the CCD (MAIN) adjustment value of Simulation 48-1.
When the adjustment value is increased, the copy magnifica-
tion ratio is increased.
When the adjustment value is changed by 1, the copy magnifi-
cation ratio is changed by about 0.02%.
When the adjustment value is increased, the copy magnifica-
tion ratio is increased.
When the adjustment value is changed by 1, the copy magnifi-
cation ratio is changed by about 0.02%.
Item/Display
Content
Setting
range
Default
value
A
Lead
edge
adjust-
ment
value
edge
adjust-
ment
value
RRCA
Document lead edge
reference position
(OC)
reference position
(OC)
0 - 99
50
B
RRCB-CS12
Resist
motor ON
timing
adjust-
ment
motor ON
timing
adjust-
ment
Standard
Tray
Tray
1 - 99
50
C
RRCB-CS34
Desk
1 - 99
50
D
RRCB-LCC
LCC
1 - 99
50
E
RRCB-MFT
Manual
paper
feed
paper
feed
1 - 99
50
F
RRCB-ADU
ADU
1 - 99
50
G Image
loss area
setting
value
setting
value
LEAD
Lead edge image
loss area setting
loss area setting
0 - 99
30
H
SIDE
Side image loss area
adjustment
adjustment
0 - 99
20
I
Void area
adjust-
ment
adjust-
ment
DENA
Lead edge void area
adjustment
adjustment
1 - 99
30
J
DENB
Rear edge void area
adjustment
adjustment
1 - 99
30
K
FRONT/
REAR
REAR
FRONT/REAR void
area adjustment
area adjustment
1 - 99
30
L
Off-center
adjust-
ment
adjust-
ment
OFFSET_
OC
OC
OC document off-
center adjustment
center adjustment
1 - 99
50
M Magnifi-
cation
ratio
correction
ratio
correction
SCAN_
SPEED_OC
SPEED_OC
SCAN sub scanning
magnification ratio
adjustment (CCD)
magnification ratio
adjustment (CCD)
1 - 99
50
N Sub
scanning
direction
print area
correction
value
direction
print area
correction
value
DENB-MFT
Manual feed
correction value
correction value
1 - 99
50
O
DENB-CS1
Tray 1 correction
value
value
1 - 99
50
P
DENB-CS2
Tray 2 correction
value
value
1 - 99
50
Q
DENB-CS3
Tray 3 correction
value
value
1 - 99
50
R
DENB-CS4
Tray 4 correction
value
value
1 - 99
50
S
DENB-LCC
LCC correction value
1 - 99
50
T
DENB-ADU
ADU correction value
1 - 99
50
10
20
30
40
50
60
70
80
90
100
1
10
120
120
1
30
140
140
1
50
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