Sharp MX-M623U / MX-M753U (serv.man10) Service Manual ▷ View online
MX-M753N ADJUSTMENTS AND SETTINGS 5 – 16
6-B
Image focus adjustment
(DSPF back surface mode)
(DSPF back surface mode)
This adjustment is required in the following cases:
* When the DSPF CCD unit is replaced.
* When the DSPF CCD unit is replaced.
* When the focus of the back surface image is improper in the
* When the DSPF CCD unit is replaced.
* When the DSPF CCD unit is replaced.
* When the focus of the back surface image is improper in the
copy DSPF mode.
* When the DSPF unit is removed.
* When the DSPF unit is replaced.
1)
* When the DSPF unit is replaced.
1)
Make a duplex copy in DSPF mode.
2)
Make sure that the copied image on the back side of the paper
is satisfactorily focused.
If the image is not satisfactorily focused, do the following
steps.
is satisfactorily focused.
If the image is not satisfactorily focused, do the following
steps.
3)
Open the door. Remove the screws, and remove the transport
PG upper.
PG upper.
4)
To prevent against shift of the CCD unit optical axis, mark the
CCD unit base as shown below.
CCD unit base as shown below.
5)
Loosen the CCD unit fixing screws (4 pcs.).
* Never loosen the screws marked with ✕.
Loosening these screws could possibly change the CCD
unit base optical axis. Once the optical axis has been
changed, it cannot be corrected through on-site adjust-
ments. Solving such a problem requires the replacement of
the entire scanner unit.
unit base optical axis. Once the optical axis has been
changed, it cannot be corrected through on-site adjust-
ments. Solving such a problem requires the replacement of
the entire scanner unit.
6)
Slide the CCD unit in the arrow direction (CCD sub scanning
direction) to change the installing position.
When the copy image is longer than the original scale, shift the
CCD unit in the direction B. When the copy image is shorter
than the original scale, shift the CCD unit in the direction A.
One scale of mark-off line corresponds to 0.2%.
At that time, fix the CCD unit so that it is in parallel with the
scale on the front and the rear side of the CCD unit base.
* Fix the CCD unit so that it is in parallel with the line marked
direction) to change the installing position.
When the copy image is longer than the original scale, shift the
CCD unit in the direction B. When the copy image is shorter
than the original scale, shift the CCD unit in the direction A.
One scale of mark-off line corresponds to 0.2%.
At that time, fix the CCD unit so that it is in parallel with the
scale on the front and the rear side of the CCD unit base.
* Fix the CCD unit so that it is in parallel with the line marked
in procedure 4).
7)
Make a copy and check the copy magnification ratio again.
If the copy magnification ratio is not in the range of 100
If the copy magnification ratio is not in the range of 100
1%,
repeat the procedures of 4) – 6) until the condition is satisfied.
NOTE: By changing the CCD unit fixing position with the simula-
tion 48-1 adjustment value at 50, the copy magnification
ratio is adjusted within the specified range (100
ratio is adjusted within the specified range (100
1.0%)
and the specified resolution is obtained based on the opti-
cal system structure.
cal system structure.
ADJ 7
Image lead edge position,
image loss, void area, image
off-center, and image
magnification ratio adjustment
(automatic adjustment)
image loss, void area, image
off-center, and image
magnification ratio adjustment
(automatic adjustment)
The following adjustment items can be executed automatically with
SIM 50-28. It takes less time to use this adjustment than to use the
following manual adjustments.
* ADJ18 Print engine image position, image magnification ratio,
SIM 50-28. It takes less time to use this adjustment than to use the
following manual adjustments.
* ADJ18 Print engine image position, image magnification ratio,
void area, off-center adjustment (manual adjustment)
* ADJ 19 Scan image magnification ratio adjustment (Manual
adjustment)
* ADJ 20 Scan image off-center adjustment (Manual adjustment)
* ADJ 21 Copy image position, image loss, and void area adjust-
* ADJ 21 Copy image position, image loss, and void area adjust-
ment (Manual adjustment)
(Menu in SIM 50-28 mode)
Item/Display
Content
OC ADJ
Image loss off-center sub scanning direction image
magnification ratio adjustment (Document table mode)
magnification ratio adjustment (Document table mode)
BK-MAG ADJ
Main scanning direction image magnification ratio
adjustment
adjustment
SPF ADJ
Image loss off-center sub scanning direction image
magnification ratio adjustment (DSPF mode)
magnification ratio adjustment (DSPF mode)
SETUP/PRINT
ADJ
ADJ
Print lead edge adjustment, image off-center (each
paper feed tray, duplex mode) adjustment
paper feed tray, duplex mode) adjustment
RESULT
Adjustment result display
DATA
Display of data used when an adjustment is executed
A
B
MX-M753N ADJUSTMENTS AND SETTINGS 5 – 17
7-A
Print image main scanning direction image
magnification ratio automatic adjustment
(Print engine)
magnification ratio automatic adjustment
(Print engine)
This adjustment must be performed in the following cases:
* When the PCU CONTROL PWB is replaced.
* When the EEPROM on the PCU PWB is replaced.
* When the LSU is replaced.
* U2 trouble has occurred.
* The DSPF section has been disassembled.
* When the DSPF unit is replaced.
1)
* When the PCU CONTROL PWB is replaced.
* When the EEPROM on the PCU PWB is replaced.
* When the LSU is replaced.
* U2 trouble has occurred.
* The DSPF section has been disassembled.
* When the DSPF unit is replaced.
1)
Enter the SIM50-28 mode.
2)
Select [BK-MAG ADJ] with the key.
3)
Select the paper feed tray with paper in it with the key. (Any
paper size will do.)
paper size will do.)
4)
Press [EXECUTE] key.
The color patch image (adjustment pattern) is printed out.
The color patch image (adjustment pattern) is printed out.
5)
Set the adjustment pattern on the document table. (Any direc-
tion)
tion)
NOTE: Fit the adjustment pattern correctly with the document
guide.
6)
Press [EXECUTE] key.
7)
Press [OK] key.
The adjustment result becomes valid.
The adjustment result becomes valid.
7-B
Print image off-center automatic
adjustment (Print engine)
(Each paper feed tray)
adjustment (Print engine)
(Each paper feed tray)
This adjustment must be performed in the following cases:
* 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.
* When the EEPROM on the PCU PWB is replaced.
1)
* 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.
* When the EEPROM on the PCU PWB is replaced.
1)
Enter the SIM50-28 mode.
2)
Select [SETUP/PRINT] ADJ with the key.
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MX-M753N ADJUSTMENTS AND SETTINGS 5 – 18
3)
Select [ALL] with the key.
(Note)
By pressing [LEAD] or [OFFSET] key, the following items can
be executed individually.
* [LEAD]: Print image lead edge image position adjustment
* [OFFSET]: Print image off-center adjustment
By pressing [LEAD] or [OFFSET] key, the following items can
be executed individually.
* [LEAD]: Print image lead edge image position adjustment
* [OFFSET]: Print image off-center adjustment
When [ALL] is selected, both of the above two items are
executed simultaneously.
executed simultaneously.
4)
Select a paper feed tray to be adjusted.
5)
Press [EXECUTE] key.
The color patch image (adjustment pattern) is printed out.
The color patch image (adjustment pattern) is printed out.
6)
Set the adjustment pattern on the document table. (Any direc-
tion)
tion)
NOTE: Fit the adjustment pattern correctly with the document
guide.
7)
Press [EXECUTE] key.
8)
Press [OK] key.
The adjustment result becomes valid.
The adjustment result becomes valid.
Perform procedures 4) to 7) for each paper feed tray.
7-C
Copy lead edge image reference position
adjustment, image loss, void area, scanner
image off-center, and scanner sub scanning
direction image magnification ratio
automatic adjustment (document table
mode)
adjustment, image loss, void area, scanner
image off-center, and scanner sub scanning
direction image magnification ratio
automatic adjustment (document table
mode)
This adjustment must be performed in the following cases:
* When the LSU is replaced.
* When the scan control PWB is replaced.
* When the EEPROM on the scan control PWB is replaced.
* The scanner section has been disassembled.
* When the scanner unit is replaced.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* When the EEPROM on the PCU PWB is replaced.
1)
* When the LSU is replaced.
* When the scan control PWB is replaced.
* When the EEPROM on the scan control PWB is replaced.
* The scanner section has been disassembled.
* When the scanner unit is replaced.
* When the registration roller section is disassembled.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* When the EEPROM on the PCU PWB is replaced.
1)
Enter the SIM50-28 mode.
2)
Select [OC ADJ] with the key.
3)
Select the paper feed tray with paper in it with the key. (Any
paper size will do.)
paper size will do.)
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MX-M753N ADJUSTMENTS AND SETTINGS 5 – 19
4)
Press [EXECUTE] key.
The color patch image (adjustment pattern) is printed out.
The color patch image (adjustment pattern) is printed out.
5)
Set the adjustment pattern on the document table. (Any direc-
tion)
tion)
NOTE: Fit the adjustment pattern correctly with the document
guide.
6)
Press [EXECUTE] key.
7)
Press [OK] key.
The adjustment result becomes valid.
The adjustment result becomes valid.
7-D
Copy image off-center, image loss, void
area, image lead edge position, and DSPF
sub scanning direction image
magnification ratio automatic adjustment
(DSPF mode)
area, image lead edge position, and DSPF
sub scanning direction image
magnification ratio automatic adjustment
(DSPF mode)
This adjustment must be performed in the following cases:
* When the scan control PWB is replaced.
* When the EEPROM on the scan control PWB is replaced.
* When the scanner (reading) section is disassembled.
* When the scanner (reading) section is replaced.
* U2 trouble has occurred.
* When the scan control PWB is replaced.
* When the EEPROM on the scan control PWB is replaced.
* When the scanner (reading) section is disassembled.
* When the scanner (reading) section is replaced.
* U2 trouble has occurred.
* The DSPF section has been disassembled.
* When the DSPF unit is replaced.
* When the LSU is replaced.
This adjustment is used to adjust the document lead edge, the
image loss, the void area, and the off-center sub operation magnifi-
cation ratio of the DSPF (front and back).
1)
* When the DSPF unit is replaced.
* When the LSU is replaced.
This adjustment is used to adjust the document lead edge, the
image loss, the void area, and the off-center sub operation magnifi-
cation ratio of the DSPF (front and back).
1)
Enter the SIM50-28 mode, and select [SPF ADJ].
2)
Select the adjustment items, ALL (front, back, both).
<List of adjustment items>
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.
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Menu display item
Content
SIDE1
DSPF adjustment front surface
SIDE2
DSPF adjustment back surface
ALL
DSPF adjustment front/back surface
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