Sharp MX-M623U / MX-M753U (serv.man10) Service Manual ▷ View online
MX-M753N ADJUSTMENTS AND SETTINGS 5 – 8
6)
Apply a digital multi-meter to the check pin of the high voltage
PWB (TC cleaning) and the chassis GND.
PWB (TC cleaning) and the chassis GND.
ADJ 3
Print engine image skew
adjustment
(LSU parallelism adjustment)
adjustment
(LSU parallelism adjustment)
This adjustment is needed in the following situations:
* When the LSU unit is replaced.
* When the LSU unit is removed from the main unit.
1)
* When the LSU unit is replaced.
* When the LSU unit is removed from the main unit.
1)
Enter the SIM 64-2 mode.
2)
Set the set items to the values shown below.
3)
Select the paper feed tray with A3 (11" x 17") paper in it by
changing the value of G.
changing the value of G.
4)
Press [EXECUTE] key.
The check pattern is printed out.
The check pattern is printed out.
5)
Check the printed image for any skew.
Measure the right angle level by using the printed cross pat-
tern.
There are following two methods of checking the image for any
skew (right angle).
Method 1:
Measure the maximum length of the diagonal lines of the rect-
angle print pattern. Check the difference in the length of the
diagonal lines for judgment of good or no good.
Method 2:
Compare the right angle of vertical side and the horizontal side
of the rectangle print pattern with the right angle of A3 or 11" x
8.5" paper for judgment of good or no good.
Measure the right angle level by using the printed cross pat-
tern.
There are following two methods of checking the image for any
skew (right angle).
Method 1:
Measure the maximum length of the diagonal lines of the rect-
angle print pattern. Check the difference in the length of the
diagonal lines for judgment of good or no good.
Method 2:
Compare the right angle of vertical side and the horizontal side
of the rectangle print pattern with the right angle 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.
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 of the rectangle
print pattern.
a) Measure the length of the diagonal lines of the rectangle
print 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 =
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.
is no need to adjust.
(Method 2)
a) Fit the side of A3 or 11" x 17" paper to the long side of the
rectangle print pattern.
a) Fit the side of A3 or 11" x 17" paper to the long side of the
rectangle print pattern.
b) Measure the shift distance between vertical side of paper
and side of the rectangle print pattern.
If the above distance is 0.5mm or less, there is no need to
adjust.
If not, execute the following procedures.
and side of the rectangle print pattern.
If the above distance is 0.5mm or less, there is no need to
adjust.
If not, execute the following procedures.
Item
Setting value
A
1
B
1
C
254
D
255
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Diagonal line D
Diagonal line C
Direction B
Direction A
Comparison line
0.5mm or less
MX-M753N ADJUSTMENTS AND SETTINGS 5 – 9
6)
Draw out the manual paper feed tray, and remove the front
frame side, side cover, fan cover cabinet, and fan unit.
frame side, side cover, fan cover cabinet, and fan unit.
7)
Turn OFF the power and remove the fan unit.
8)
Loosen the LSU fixing plate screw, and change the LSU fixing
angle. (Move the LSU front frame side up and down to adjust.)
(When Method 1 is used to check the image for any skew
(right angle) in procedure 5 in advance)
When C > D (the lengths of the diagonal lines), the LSU is
shifted upward.
When C < D (the lengths of the diagonal lines), the LSU is
shifted downward.
(When Method 2 is used to check the image for any skew
(right angle) in procedure 5 in advance)
When the image is skewed in the arrow direction a, shift down
the LSU (in direction a in the figure below). When the image is
skewed in direction b, shift up the LSU (in direction b in the fig-
ure below).
angle. (Move the LSU front frame side up and down to adjust.)
(When Method 1 is used to check the image for any skew
(right angle) in procedure 5 in advance)
When C > D (the lengths of the diagonal lines), the LSU is
shifted upward.
When C < D (the lengths of the diagonal lines), the LSU is
shifted downward.
(When Method 2 is used to check the image for any skew
(right angle) in procedure 5 in advance)
When the image is skewed in the arrow direction a, shift down
the LSU (in direction a in the figure below). When the image is
skewed in direction b, shift up the LSU (in direction b in the fig-
ure below).
ADJ 4
Scan image distortion
adjustment (OC mode)
adjustment (OC mode)
This adjustment is needed in the following situations:
* When the scanner (reading) section is disassembled.
* When the copy image is distorted.
* When the scanner (reading) section is disassembled.
* When the copy image is distorted.
4-A
Scanner (reading) unit parallelism
adjustment
adjustment
Before execution of this adjustment, remove the document table
glass.
1)
glass.
1)
Loosen the fixing screws of the scanner unit A and the drive
wire, and remove the scanner unit A from the drive wire.
wire, and remove the scanner unit A from the drive wire.
2)
Turn the scanner drive pulley manually and shift the scanner
unit B to bring it into contact with the stopper.
When the scanner unit B is in contact with the two stoppers on
the front and the rear frames simultaneously, the parallelism is
proper.
unit B to bring it into contact with the stopper.
When the scanner unit B is in contact with the two stoppers on
the front and the rear frames simultaneously, the parallelism is
proper.
If this requirement is not met, do the following steps.
3)
Loosen the fixing screw of the pulley angle on the front frame
side of the scanner unit B.
side of the scanner unit B.
a
b
MX-M753N ADJUSTMENTS AND SETTINGS 5 – 10
4)
Adjust the position of the pulley angle on the front frame side
of the scanner unit B so that it is in contact with two stoppers
on the front and the rear frames simultaneously.
of the scanner unit B so that it is in contact with two stoppers
on the front and the rear frames simultaneously.
5)
Fix the pulley angle on the front frame side of the scanner unit
B.
If a satisfactory result is not obtained from the above proce-
dures, perform the following procedures.
Loosen the fixing screw of the scanner unit drive pulley which
is not in contact.
Without moving the scanner unit drive shaft, turn the scanner
unit drive pulley manually and adjust so that the scanner unit B
is in contact with both stoppers on the front frame and the rear
frame simultaneously. (Change the relative position of the
scanner unit drive pulley and the drive shaft.) Fix the scanner
unit drive pulley fixing screw.
B.
If a satisfactory result is not obtained from the above proce-
dures, perform the following procedures.
Loosen the fixing screw of the scanner unit drive pulley which
is not in contact.
Without moving the scanner unit drive shaft, turn the scanner
unit drive pulley manually and adjust so that the scanner unit B
is in contact with both stoppers on the front frame and the rear
frame simultaneously. (Change the relative position of the
scanner unit drive pulley and the drive shaft.) Fix the scanner
unit drive pulley fixing screw.
6)
With the scanner unit B in contact with both stoppers, fit the
edge of the scanner unit A with the right edge of the frame, and
fix the scanner unit A with the fixing screw.
edge of the scanner unit A with the right edge of the frame, and
fix the scanner unit A with the fixing screw.
4-B
Scan image sub scanning direction
distortion adjustment
distortion adjustment
1)
Make a test chart on A3 (11" x 17") paper as shown below.
(Draw a rectangular with four right angles.)
(Draw a rectangular with four right angles.)
2)
Set the test chart prepared in the procedure 1) on the docu-
ment table. (Shift the test chart edge 30mm from the reference
position as shown below.) With the document cover open,
make a copy on A3 (11" x 17") paper.
ment table. (Shift the test chart edge 30mm from the reference
position as shown below.) With the document cover open,
make a copy on A3 (11" x 17") paper.
3)
Check for distortion in the sub scanning direction.
If La = Lb, there is no distortion.
If La = Lb, there is no distortion.
If there is any distortion in the sub scanning direction, perform
the following procedures.
the following procedures.
L
L
L = 10mm
L
L
La
Lb
MX-M753N ADJUSTMENTS AND SETTINGS 5 – 11
4)
Loosen either one of the fixing screws of the scanner unit drive
pulley. (Either one on the front frame or on the rear frame will
do.)
pulley. (Either one on the front frame or on the rear frame will
do.)
5)
Without moving the scanner unit drive shaft, manually turn the
scanner unit drive pulley to change the parallelism of the scan-
ner unit A and B. (Change the relative position of the scanner
unit drive pulley and the drive shaft.)
scanner unit drive pulley to change the parallelism of the scan-
ner unit A and B. (Change the relative position of the scanner
unit drive pulley and the drive shaft.)
6)
Tighten the scanner unit drive pulley fixing screw.
Repeat the procedures 2) - 6) until the condition of the procedure 3)
is satisfied.
If the distortion in the sub scanning direction cannot be deleted with
the above procedures, perform "ADJ 11D Scan image distortion
adjustment (whole scanner unit).
is satisfied.
If the distortion in the sub scanning direction cannot be deleted with
the above procedures, perform "ADJ 11D Scan image distortion
adjustment (whole scanner unit).
4-C
Scan image main scanning direction
distortion adjustment
distortion adjustment
1)
Make a test chart on A3 (11" x 17") paper as shown below.
(Draw a rectangular with four right angles.)
(Draw a rectangular with four right angles.)
2)
Set the test chart prepared in the procedure 1) on the docu-
ment table, and make a copy on A3 (11"x 17") paper.
ment table, and make a copy on A3 (11"x 17") paper.
3)
Check for distortion in the main scanning direction.
If the four angles of the rectangle on the copy are right angles,
there is no distortion and therefore no further steps are
needed.
If the four angles of the rectangle on the copy are right angles,
there is no distortion and therefore no further steps are
needed.
If there is any distortion in the main scanning direction, perform
the following procedure.
the following procedure.
4)
Check the difference (distortion balance) between left-hand
and right-hand side images distortions.
and right-hand side images distortions.
If Lc = Ld, the distortion on the left is equal to that on the right.
(The distortions are balanced.)
If the above condition is satisfied, go to the procedure 6).
If not, perform the following procedures.
(The distortions are balanced.)
If the above condition is satisfied, go to the procedure 6).
If not, perform the following procedures.
5)
Change the height balance of the scanner rail on the front
frame side.
frame side.
Remove the lower cabinet of the operation panel. Loosen the
scanner rail fixing screw to change the balance between the
right and the left heights of the scanner rail.
Repeat the procedures 2) - 5) until the difference between the
image distortions (distortion balance) is deleted.
scanner rail fixing screw to change the balance between the
right and the left heights of the scanner rail.
Repeat the procedures 2) - 5) until the difference between the
image distortions (distortion balance) is deleted.
6)
Without changing the balance of the scanner rail on the front
frame side, change the overall height.
frame side, change the overall height.
7)
Set the test chart prepared in the procedure 1) on the docu-
ment table, and make a copy on A3 (11" x 17") paper. Check
that the distortion in the main scanning direction is within the
specified range.
Repeat the procedures 6) and 7) until the distortion in the main
scanning direction is in the specified range.
If the distortion in the sub scanning direction cannot be deleted
with the above procedures, perform ADJ 11D Scan image dis-
tortion adjustment (whole scanner unit).
ment table, and make a copy on A3 (11" x 17") paper. Check
that the distortion in the main scanning direction is within the
specified range.
Repeat the procedures 6) and 7) until the distortion in the main
scanning direction is in the specified range.
If the distortion in the sub scanning direction cannot be deleted
with the above procedures, perform ADJ 11D Scan image dis-
tortion adjustment (whole scanner unit).
L
L
L = 10mm
L
L
Lc
Ld
Copy A
Lc
Ld
Copy B
There is no difference
between the distortion on
the right and that on the left.
between the distortion on
the right and that on the left.
Lc
Ld
Lc
Ld
There is some difference
between the distortion on
the right and that on the left.
between the distortion on
the right and that on the left.
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