Sharp Mx 2300n Service Manual

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 17 4) Check the rough adjustment and the fine adjustment print pat-
tern positions of each color in the front frame and the rear
frame sides.
Use the visually highest color density section as the center,
and measure the shift amount.
The front frame registration and the rear frame registration are
adjusted independently.
To check the image registration, therefore, check the front
frame side and the rear frame side individually.
(If the fine adjustment print pattern is located in the range of 0
± 1 from the fine adjustment reference pattern scale, the
adjustment is not required.)
If the above condition is not satisfied, select the color mode
adjustment item A – F to be adjusted with the scroll key and
change the adjustment value to adjust.
Repeat procedures 3) – 4) until a satisfactory result is
obtained.
For measurement of the shift amount and the calculation of the
adjustment value, refer to the table below.
(Measurement of the shift amount and the calculation of
the adjustment value)
a) Measurement of the shift amount
* Measurement of the fine adjustment pattern
The visually highest color density section is regarded as
the center, and used as the measurement value.
(Example)
The measurement value of the figure is 7.
* Measurement of the rough adjustment pattern
Check that the color line is positioned in the plus direc-
tion or in the minus direction and judge the polarity from
that.
The center black line is scaled as 0, the first line mark
as 20, the second line mark as 40, the third line mark as
60. The interval between the rough adjustment marks
corresponds to 20.
(Example)
In the case of the figure, it is between 20 – 40 of the
plus polarity, and the measurement is 20.
* The actual shift amount is the sum of the rough adjust-
ment reference shift amount and the fine adjustment
shift amount.
Shift amount (correction value) = Rough adjustment
shift amount + Fine adjustment shift amountWhen calculating, be careful of the plus polarity and the
minus polarity.
(Example)
In the case of the figure, the total shift amount is 27.
Measurement value: 27 (= 20 + 7)
Measurement value: –27 (= –20 – 7)
The shift amount from the adjustment reference position
is calculated for each of six kinds of adjustment items A
– F.
b) Adjustment value calculation
Add or subtract the shift amount calculated above to or
from the current adjustment value, and the result value is
used as the new adjustment value.
Adjustment value = Current adjustment value + Shift
amount (correction value)
(When the shift amount (correction value) is plus)
Adjustment value = Current adjustment value – Shift
amount (correction value)
(When the shift amount (correction value) is minus)
Rough adjustment 
print pattern check:Check that the rough adjustment print pattern is at 
the center for the rough adjustment reference 
pattern.
Fine adjustment 
print pattern check:Check that the fine adjustment print pattern is at the 
center for the fine adjustment reference pattern.
Display/Item ContentAdjustment 
value rangeDefault 
value
ACYAN 
(FRONT)Image registration adjustment 
value (Main scanning 
direction) (Cyan) (F side)1 – 199 100
BCYAN 
(REAR)Image registration adjustment 
value (Main scanning 
direction) (Cyan) (R side)1 – 199 100
CMAGENTA 
(FRONT)Image registration adjustment 
value (Main scanning 
direction) (Magenta) (F side)1 – 199 100
DMAGENTA 
(REAR)Image registration adjustment 
value (Main scanning 
direction) (Magenta) (R side)1 – 199 100
E YELLOW 
(FRONT)Image registration adjustment 
value (Main scanning 
direction) (Yellow) (F side)1 – 199 100
F YELLOW 
(REAR)Image registration adjustment 
value (Main scanning 
direction) (Yellow) (R side)1 – 199 100
 





20

 
 
 
 
 
 
 
 
 
 



 





-20

 
 
 
 
 
 
 
 
 
 


 
						

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 18
 







 
 
 
 
 
 
 
 
 
 



 







 
 
 
 
 
 
 
 
 
 



 







 
 
 
 
 
 
 
 
 
 



 







 
 
 
 
 
 
 
 
 
 



 







 
 
 
 
 
 
 
 
 
 



 







 
 
 
 
 
 
 
 
 
 



EF Yellow
CD Magenta
AB Cyan 
						

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 19 (Example)
NOTE: If either of front or rear adjustment value is changed, the
other adjustment print pattern position may be varied. Be
careful of that.
 10-C Image registration adjustment (Sub scan-
ning direction) (Manual adjustment)
1) Enter SIM50-21 mode.
2) Select the paper feed tray with A4 (11 x 8.5) or A3 (11 x 17)
paper in it by changing the value of set item H.
3) Press [EXECUTE] key.
The sub scanning direction image registration adjustment pat-
tern is printed.
A: Rough adjustment pattern
B: Fine adjustment pattern
C: Adjustment range
Previous value before adjustment New adjustment value
A: 100 A: 93 (= 100 – 7)
B: 112 B: 100 (= 112 – 12)
C: 95 C: 96 (= 95 + 1)
D: 98 D: 109 (= 98 + 11)
E: 102 E: 109 (= 102 + 7)
F: 96 F: 118 (= 96 + 22)
EXECUTE
EXECUTE
0
A:Axxx
BxxxCYAN
MAGENTA
SIMULATION
!NO.50-21
REGISTRATION ADJUSTMENT : SCANNING DIRECTION
xxx
1199
OK
TEST
EXECUTE
CLOSE
CxxxYELLOW
DxxxMULTIOUNT
0
A:
!Axx
BxxCYAN
MAGENTA
SIMULATION
!NO.50-21
REGISTRATION
!ADJUSTMENT : SCANNING DIRECTION
xxx
1199
OK
TEST
EXECUTE
CLOSE
CxxxYELLOW
DxxxMULTIOUNT
10-key
orendofprint
B
CA 
						

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 20 4) Check the rough adjustment and the fine adjustment print pat-
tern positions of each color.
The visually highest color density section is regarded as the
center, and used as the measurement value.
(If the fine adjustment print pattern is positioned in the range of
0 ± 1 for the fine adjustment reference pattern scale, the
adjustment is not required.)
If the above condition is not satisfied, select the color mode
adjustment item A – C to be adjusted with the scroll key, and
change the adjustment value to adjust.
Repeat procedures 3) – 4) until a satisfactory result is
obtained.
For measurement of the shift amount and calculation of the
adjustment value, refer to the table below.
(Measurement of the shift amount and calculation of the
adjustment value)
a) Measurement of the shift amount
* Measurement of the fine adjustment pattern
The visually highest color density section is regarded as
the center, and used as the measurement value of the
shift amount.
(Example)
The measurement value of the figure is 7.
* Measurement of the rough adjustment pattern
Check that the color line is positioned in the plus direc-
tion or in the minus direction and judge the polarity from
that.
The center black line mark is scaled as 0, the first line
mark as 20, the second line mark as 40, the third line
mark as 60. The interval between the rough adjustment
marks corresponds to 20.
(Example)
In the case of the figure, it is between 20 – 40 of the
plus polarity, and the measurement is 20.
A: Rough adjustment pattern
B: Fine adjustment pattern
C: Adjustment range
The shift amount is calculated from the adjustment ref-
erence position for each of the three adjustment items A
– C.Measurement value: –27 (= –20 – 7)
Measurement value: 27 (= 20 + 7)
Rough adjustment 
print pattern check:Check that the rough adjustment print pattern is at 
the center for the rough adjustment reference 
pattern.
Fine adjustment 
print pattern check:Check that the fine adjustment print pattern is at the 
center for the fine adjustment reference pattern.
Display/Item ContentAdjustment 
value rangeDefault 
value
A CYAN Image registration adjustment 
value (Sub scanning 
direction) (Cyan)1 – 199 100
B MAGENTA Image registration adjustment 
value (Sub scanning 
direction) (Magenta)1 – 199 100
C YELLOW Image registration adjustment 
value (Sub scanning 
direction) (Yellow)1 – 199 100
-20
CA
B









 
 
 
 
 
 
 
 
 
 



20
CA
B









 
 
 
 
 
 
 
 
 
 


 
						

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 21 b) Adjustment value calculation
Add or subtract the shift amount calculated above to or from the current adjustment value, and the result value is used as the new
adjustment value.
Adjustment value = Current adjustment value + Shift amount (correction value)
(When the shift amount (correction value) is plus)
Adjustment value = Current adjustment value – Shift amount (correction value)
(When the shift amount (correction value) is minus)
 
11Scan image distortion adjustment
This adjustment is required in the following cases:
* When the scanner (reading) section is disassembled.
* When the copy image is distorted.
 11-A Scanner (reading) unit parallelism adjust-
ment
Before execution of this adjustment, remove the document table
glass. (For details, refer to Chapter [C]-3.)
1) Loosen the fixing screws of the scanner unit A and the drive
wire, and remove the scanner unit A from the drive wire.
A









 
 
 
 
 
 
 
 
 
 



B









 
 
 
 
 
 
 
 
 
 



C









 
 
 
 
 
 
 
 
 
 



Previous adjustment value New adjustment value
A: 100 A: 73 (= 100 – 27)
B :  11 2 B :  11 9  ( =  11 2  +  7 )
C: 95 C: 110 (= 95 + 15) 
						

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 22 2) Turn the scanner drive pulley manually and shift the scanner
unit B to bring it into contact with the stopper. When the scan-
ner unit B is in contact with the two stoppers on the front and
the rear frames simultaneously, the parallelism is proper.
If not, perform the following procedures.
3) Loosen the fixing screw of the pulley angle on the front frame
side of the scanner unit.
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
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.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.
 11-B Scan image (sub scanning direction) dis-
tortion adjustment
1) Make a test chart with A3 (11 x 17) paper as shown below.
(Draw a rectangular with four right angles.)
L
L
L = 10mm
L L 
						

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 23 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.
3) Check for distortion in the sub scanning direction.
If La = Lb, there is no distortion.
If there is any distortion in the sub scanning direction, perform
the following procedures.
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.)
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.)
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).
 11-C Scan image (main scanning direction) dis-
tortion adjustment
1) Make a test chart on A3 (11 – 17) paper. (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 (11x 17) paper.
3) Check for distortion in the main scanning direction.
If the four angles of the copy image are right angles, there is
no distortion. (Completion of the adjustment)
If there is any distortion in the main scanning direction, perform
the following procedure.
4) Check the difference (distortion balance) between the image
distortions on the right and the left.
If Lc = Ld, there is no difference between the right and the left
image distortions.
If the above condition is satisfied, go to the procedure 6).
If not, perform the following procedures.
La Lb
L
L
L = 10mm
L L
Lc
Ld Copy ALc
Ld Copy B
There is no difference
between the distortion on
the right and that on the left.
Lc=LdThere is some difference
between the distortion on
the right and that on the left.
Lc≠Ld 
						

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 24 5) Change the height balance of the scanner rail on the front
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.
6) Without changing the balance of the scanner rail on the front
frame side, change the overall height.
7) Set the test chart prepared in the procedure 1) 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).
 11-D Scan image distortion adjustment (Whole
scanner)
This adjustment is executed when scan image distortion cannot be
adjusted with ADJ 11A, ADJ 11B, and ADJ 11C related to the scan
image distortion adjustment.
Change the upper and lower positions of the scanner unit distortion
adjustment plate on the right edge of the scanner unit so that the
scan image distortion is minimized. By adjusting the distortion of
the whole scanner unit, the scan image distortion is adjusted.
1) Loosen the fixing screw (A).
2) Adjust the scanner unit distortion adjustment plate.
 
12Scan image focus adjustment (CCD
unit position adjustment)
This adjustment is required in the following cases:
* When the CCD unit is removed from the machine.
* When the CCD unit is replaced.
* When the copy image focus is not properly adjusted.
* When the copy magnification ratio in the copy image main scan-
ning direction is not properly adjusted.
* When a U2 trouble occurs.
1) Enter the simulation 48-1 mode.
2) Set the adjustment item CCD (MAIN) to 50 (default value).
Select the adjustment item with the scroll key, and enter the
adjustment value with 10-key and press [OK] key.
3) Place a scale on the document table as shown in the figure
below.
4) Make a normal copy on A4 paper.
Press [CLOSE] key to shift from the simulation mode to the
copy mode, and make a copy.
5) Compare the scale length with the scale image length on the
copy paper.
6) Obtain the copy magnification ratio correction ratio in the main
scanning direction from the following formula.
Main scanning direction copy magnification ratio correction
ratio = (Original size – Copy image size) / Original size x 100%
Example: Compare the scale of 10mm with the scale of 10mm 
on the copy image.
Main scanning direction copy magnification ratio correction
ratio = (100 – 99) / 100 x 100 = 1
AAA
A
CLOSE0
A:A9æxx
B9æxx
C9æxx
D9æxx9çCCD(MAIN)
9çCCD(SUB)
9çSPF(MAIN)9çSPF(SUB)
SIMULATIONNO.48-01
MAGNIFICATION ADJUSTMENT
xx
199
OK
TEST
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 
						

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 25 If the copy magnification ratio is not satisfactory, perform the
following procedures.
7) Remove the document table glass.
8) Remove the dark box cover.
9) To prevent against shift of the CCD unit optical axis, mark the
CCD unit base as shown below.
* This procedure must be executed also when the CCD unit is
replaced.
10) Loosen the CCD unit fixing screws.
*Never loosen the screws marked with ✕.
If any one of these screws is loosened, the position and the
angle of the CCD unit base may be changed to cause a
problem, which cannot be adjusted in the market. In that
case, the whole scanner unit must be replaced.11) 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
in procedure 9).
12) Make a copy and check the copy magnification ratio again.
If the copy magnification ratio is not in the range of 100 ± 1%,
repeat the procedures of 9) – 11) 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 ± 1.0%)
and the specified resolution is obtained based on the opti-
cal system structure.
 
13Scan image skew adjustment
(RSPF) (Refer to MX-RPX1 SM.)
 
14Scan image magnification ratio
adjustment (Document table mode)
This adjustment is required in the following cases:
* When the copy image magnification ration 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.
10 20 90 100 110
10 20 90 100 110
1.0mm 100mm scale
(Original)
Copy image
(1mm (1%)
shorter than
the original)
B
A 
						

							MX-2300/2700 N/G  ADJUSTMENTS  6 – 26
 14-A Scan image magnification ratio adjustment
(Main scanning direction) (Document table
mode)
1) Place a scale on the document table as shown in the figure
below.
2) Enter the simulation 48-1 mode.
3) Make a normal copy and obtain the copy magnification ratio.
Press [CLOSE] key and 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 ± 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.
5) Change the CCD (MAIN) adjustment value of Simulation 48-1.
When the adjustment value is increased, the copy magnifica-
tion ratio in the sub scanning direction is increased.
When the adjustment value is changed by 1, the copy magnifi-
cation ratio is changed by about 0.1%.
Repeat the procedures 3) – 5) until the copy magnification
ratio is within the specified range (100 ± 1.0%).
 14-B Scan image magnification ratio adjustment
(Sub scanning direction) (Document table
mode)
1) Place a scale on the document table as shown in the figure
below.2) Enter the simulation 48-1 mode.
3) Make a normal copy and obtain the copy magnification ratio.
Press [CLOSE] key and 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 ± 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.
5) Change the CCD (SUB) adjustment value of Simulation 48-1.
When the adjustment value is increased, the copy magnifica-
tion ratio in the sub scanning direction is increased.
When the adjustment value is changed by 1, the copy magnifi-
cation ratio is changed by about 0.1%.
Repeat the procedures 3) – 5) until the copy magnification ratio is
within the specified range (100 ± 1.0%). 
15Scan image magnification ratio
adjustment (RSPF mode) (Refer to
the MX-RPX1 SM.)
 15-A Scan image magnification ratio adjustment
(Main scanning direction) (RSPF mode)
(Refer to the MX-RPX1 SM.)
 15-B Scan image magnification ratio adjustment
(Sub scanning direction) (RSPF mode)
(Refer to the MX-RPX1 SM.)
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
CLOSE0
A:A9æxx
B9æxx
C9æxx
D9æxx9çCCD(MAIN)
9çCCD(SUB)
9çSPF(MAIN)9çSPF(SUB)
SIMULATIONNO.48-01
MAGNIFICATIONADJUSTMENT
xx
199
OK
TEST
10 20 30 40 50 60 70 80 90 100 110 120 130 140 150
CLOSE0
A:A9æxx
B9æxx
C9æxx
D9æxx9çCCD(MAIN)
9çCCD(SUB)
9çSPF(MAIN)9çSPF(SUB)
SIMULATIONNO.48-01
MAGNIFICATIONADJUSTMENT
xx
199
OK
TEST
10 20 90
100 110
10 20 90
100 110
10 20 90
100 110
Copy magnification ratio
(Original dimension – Copy dimension)
Original dimension =x 100 [%]
(Example 1)
Copy A
(Shorter than
the original)
Scale
(Original)
(Example 2)
Copy B
(Longer than
the original)