Sharp MX-1800N (serv.man14) Service Manual ▷ View online
MX-1800N ADJUSTMENTS 6 – 9
If the adjustment is not completed normally, "ERROR" is displayed.
In that case, check the following sections for any abnormality. If any
abnormality is found, repair and adjust again.
If an error occurs, the adjustment result is not revised.
* Color image density sensor
* PCU PWB
* Image sensor calibration jig (standard reflection sheet dirt,
In that case, check the following sections for any abnormality. If any
abnormality is found, repair and adjust again.
If an error occurs, the adjustment result is not revised.
* Color image density sensor
* PCU PWB
* Image sensor calibration jig (standard reflection sheet dirt,
scratch, discoloration)
NOTE: Store the image sensor calibration jig under low tempera-
ture, low humidity and dark place.
5-B
Color image density sensor, black image
density sensor, image registration sensor
adjustment
density sensor, image registration sensor
adjustment
1)
Enter SIM44-2 mode.
2)
Touch [EXECUTE] key.
The color image density sensor, the black image density sen-
sor, and the image registration sensor are automatically
adjusted.
After completion of the adjustment, the adjustment result is
displayed and [EXECUTE] key returns to the normal display.
The color image density sensor, the black image density sen-
sor, and the image registration sensor are automatically
adjusted.
After completion of the adjustment, the adjustment result is
displayed and [EXECUTE] key returns to the normal display.
If the adjustment is not completed normally, "ERROR" is dis-
played.
In that case, check the following sections for any abnormality.
If any abnormality is found, repair and adjust again.
If an error occurs, the adjustment result is not revised.
played.
In that case, check the following sections for any abnormality.
If any abnormality is found, repair and adjust again.
If an error occurs, the adjustment result is not revised.
* Color image density sensor
* Black image density sensor
* Image registration sensor
* PCU PWB
* Transfer belt (dirt, scratch)
* Transfer belt cleaner
* Black image density sensor
* Image registration sensor
* PCU PWB
* Transfer belt (dirt, scratch)
* Transfer belt cleaner
Display/Item
Content
Adjustment
value range
value range
Default
value
A
PCS_CL
CARB OUT
CARB OUT
Color image density sensor
LED current adjustment
target value
LED current adjustment
target value
1 – 255
108
B
PCS_CL
DARK
DARK
Color image density sensor
dark-voltage level
dark-voltage level
0 – 255
0
C
PCS_CL
LED ADJ
LED ADJ
Color image density sensor
LED current adjustment
target value (PCS CL CARB
OUT) registered LED current
level
LED current adjustment
target value (PCS CL CARB
OUT) registered LED current
level
1 – 255
21
0
SIMULATION NO.44-02
TEST
PROCON GAIN ADJUSTMENT
EXECUTE
PCS_CL LED ADJ
xx
:
PCS_㧷 GRND
xx
:
PCS_㧷 LED ADJ
xx
:
PCS_K BELT MAX
xx
:
PCS_CL DARK
xx
:
PCS_KBELTMIN
xx
:
PCS_K DARK
xx
:
PCS_KBELTDIF
xx
:
1/4
CLOSE
Display/Item
Content
Adjustment value range
Default value
PRO CON
A
PCS_CL LED ADJ
Color image density sensor light emitting quantity adjustment value
1 – 255
21
B
PCS _K LED ADJ
Black image density sensor light emitting quantity adjustment value
1 – 255
21
C
PCS_CL DARK
Color image sensor dark voltage
0 – 255
0
D
PCS_K DARK
Black image density sensor dark voltage
0 – 255
0
E
PCS_K GRND
Belt base detection level when completion of Item B adjustment
0 – 255
0
F
PCS_K BELT MAX
Belt base detection level (Max.)
0 – 255
0
G
PCS_K BELT MIN
Belt base detection level (Min.)
0 – 255
0
H
PCS_K BELT DIF
Belt base detection level difference (Item F – Item G)
0 – 255
0
REGIST
I
REG_F LED ADJ
Image registration sensor light emitting quantity adjustment value F
1 – 255
56
J
REG_R LED ADJ
Image registration sensor light emitting quantity adjustment value R
1 – 255
56
K
REG_F DARK
Image registration sensor dark voltage F
0 – 255
0
L
REG_R DARK
Image registration sensor dark voltage R
0 – 255
0
M
REG_F GRND
Belt base detection level when completion of Item I adjustment
0 – 255
0
N
REG_R GRND
Belt base detection level when completion of Item J adjustment
0 – 256
0
O
REG_F BELTMAX
Belt base detection level (Max.) F
0 – 255
0
P
REG_F BELT MIN
Belt base detection level (Min.) F
0 – 255
0
Q
REG_F BELT DIF
Belt base detection level difference (Item O – Item P)
0 – 255
0
R
REG_R BELT MAX
Belt base detection level (Max.) R
0 – 255
0
S
REG_R BELT MIN
Belt base detection level (Min.) R
0 – 255
0
T
REG_R BELT DIF
Belt base detection level difference (Item R – Item S)
0 – 255
0
U
REG_F PATCH (K)
Patch detection level F (K)
0 – 255
0
V
REG_F PATCH (C)
Patch detection level F (C)
0 – 255
0
W
REG_F PATCH (M)
Patch detection level F (M)
0 – 255
0
X
REG_F PATCH (Y)
Patch detection level F (Y)
0 – 255
0
Y
REG_R PATCH (K)
Patch detection level R (K)
0 – 255
0
Z
REG_R PATCH (C)
Patch detection level R (C)
0 – 255
0
AA
REG_R PATCH (M)
Patch detection level R (M)
0 – 255
0
AB
REG_R PATCH (Y)
Patch detection level R (Y)
0 – 255
0
MX-1800N ADJUSTMENTS 6 – 10
ADJ 6
Image skew adjustment (LSU
unit)
unit)
This adjustment must be executed in the following cases:
* When the LSU (writing) unit is replaced.
* When the LSU (writing) unit is removed from the main unit.
* When a color image registration mistake occurs.
* When the unit is installed or when the installing site is changed.
* When the LSU (writing) unit is replaced.
* When the LSU (writing) unit is removed from the main unit.
* When a color image registration mistake occurs.
* When the unit is installed or when the installing site is changed.
(Required depending on the cases.)
* When there is an uneven density area or a difference in color
balance in the main scanning direction (back and forth).
* When the OPC drum drive unit is replaced.
* When the primary transfer unit is replaced.
* When the color phase is not matched by the color balance
* When the primary transfer unit is replaced.
* When the color phase is not matched by the color balance
adjustment.
1) Enter SIM61-4 mode.
2) Select the paper feed tray with A3 (11 x 17) paper in it by
changing the value of set item B.
3) Touch [EXECUTE] key.
The check pattern is printed out.
4) Check the printed black image for any skew (right angle).
Measure the right angle level by using the six cross patterns
printed in black.
There are following two methods of checking the black image
for any skew (right angle).
Method 1: Measure the length of the diagonal lines from the
cross point of the cross pattern. Check the difference in the
length of the diagonal lines for judgment of good or no good.
printed in black.
There are following two methods of checking the black image
for any skew (right angle).
Method 1: Measure the length of the diagonal lines from the
cross point of the cross pattern. Check the difference in the
length of the diagonal lines for judgment of good or no good.
Method 2: Use the right angle sides 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.
(Method 1)
a) Measure the length of the diagonal lines from the cross
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.
(Method 1)
a) Measure the length of the diagonal lines from the cross
point of the outside cross 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 =
± 0.8mm
If the difference between C and D is in the above range,
there is no need to adjust.
there is no need to adjust.
(Method 2)
a) Fit the three cross points of the cross patterns in a row with
a) Fit the three cross points of the cross patterns in a row with
the side of A3 or 11 x 8.5 paper for checking for any skew
(right angle).
(right angle).
b) Measure the shortest distance between the cross pattern
on the extended line of the vertical line and the paper side.
If the above distance is 0.5mm or less, there is no need to
adjust.
If the above distance is 0.5mm or less, there is no need to
adjust.
If not, execute the following procedures.
5)
Open the front cabinet, and remove the waste toner box.
EXECUTE
EXECUTE
CLOSE
0
A:
Aȇxxx
Ȉ
MULTICOUNT
Bȇ x
Ȉ
PAPERȇCS1
SIMULATIONġ NO.61-04
LSU POSITION ADJUSTMENT (SELF PRINT)
xxx
1
999
OK
TEST
EXECUTE
0
SIMULATION NO.61-04
OK
TEST
CLOSE
EXECUTE
A:
Aȇxxx
Ȉ
MULTICOUNT
Bȇ x
Ȉ
PAPERȇCS1
LSU POSITION ADJUSTMENT (SELF PRINT)
2
1 999
10-key
or end of print
R
F
Comparison line
0.5 mm or less
Direction A
Direction B
Reference line
R
F
Diagonal line D
Diagonal line C
Direction A
Direction B
R
F
Comparison line
A3 or 11 x 8.5 paper
The cross patterns in a row
Reference line
0.5 mm or less
MX-1800N ADJUSTMENTS 6 – 11
6) Loosen the LSU (writing) unit fixing screws (2 pcs.) and shift
the skew adjustment screw in the arrow direction to adjust the
LSU (writing) unit skew.
(When Method 1 is used to check the black image for any
skew (right angle) in procedure 4)
When the lengths of the diagonal line are C > D, shift the
adjustment screw in the direction of Y.
When the lengths of the diagonal line are C < D, shift the
adjustment screw in the direction of X.
(When Method 2 is used to check the black image for any
skew (right angle) in procedure 4)
If the image is skewed in the arrow direction of A, shift the
adjustment screw to X direction. If the image is skewed in the
arrow direction of B, shift the adjustment screw to Y direction.
LSU (writing) unit skew.
(When Method 1 is used to check the black image for any
skew (right angle) in procedure 4)
When the lengths of the diagonal line are C > D, shift the
adjustment screw in the direction of Y.
When the lengths of the diagonal line are C < D, shift the
adjustment screw in the direction of X.
(When Method 2 is used to check the black image for any
skew (right angle) in procedure 4)
If the image is skewed in the arrow direction of A, shift the
adjustment screw to X direction. If the image is skewed in the
arrow direction of B, shift the adjustment screw to Y direction.
7) Install the waste toner box, and close the front cabinet.
8) Execute procedures 3) – 4).
8) Execute procedures 3) – 4).
(Repeat procedures 5) – 8) until a satisfactory result is
obtained.)
obtained.)
9) If the adjustment result reaches the satisfactory level, tighten
the adjustment screw.
(The black image skew adjustment is completed with the
above.)
(The black image skew adjustment is completed with the
above.)
10) In the above black image skew adjustment, check the color
image skew pattern printed when completion of the adjust-
ment.
ment.
In each Y/M/C color print pattern printed separately in the front
frame direction and in the rear frame direction, note the same
print color pattern and check to confirm that the difference in
the highest density sections is within
frame direction and in the rear frame direction, note the same
print color pattern and check to confirm that the difference in
the highest density sections is within
± 1 step.
(Compare the front and the rear frame positions of the same-
color print color patterns. All the highest density sections of all
the print color patterns may not be aligned on a line. Compare
only the same-color patterns.)
If the above condition is not satisfied, execute the procedures
below.
color print color patterns. All the highest density sections of all
the print color patterns may not be aligned on a line. Compare
only the same-color patterns.)
If the above condition is not satisfied, execute the procedures
below.
11) Turn the image skew adjustment screw of the target color to
adjust.
When each adjustment screw is turned, it clicks. Turn it by
5 – 6 clicks and the check pattern is changed by 1 step (1
dot size).
When the image skew pattern on the front frame side is
skewed in the arrow direction of A (to the smaller character)
from the rear frame side, turn the adjustment screw counter-
clockwise. When the image is skewed in the arrow direction of
B (to the larger character), turn the adjustment screw clock-
wise.
5 – 6 clicks and the check pattern is changed by 1 step (1
dot size).
When the image skew pattern on the front frame side is
skewed in the arrow direction of A (to the smaller character)
from the rear frame side, turn the adjustment screw counter-
clockwise. When the image is skewed in the arrow direction of
B (to the larger character), turn the adjustment screw clock-
wise.
12) Print the check pattern.
13) Check the color image skew pattern.
Repeat procedures 11) – 13) until a satisfactory result is obtained.
The image skew adjustment (LSU unit) is executed by changing
the parallelism of the LSU unit scan laser beam for the OPC drum.
13) Check the color image skew pattern.
Repeat procedures 11) – 13) until a satisfactory result is obtained.
The image skew adjustment (LSU unit) is executed by changing
the parallelism of the LSU unit scan laser beam for the OPC drum.
ADJ 7
OPC drum phase adjustment
This adjustment must be executed in the following cases:
* When the OPC drum is replaced.
* When the OPC drum is removed from the main unit.
* When the OPC drum drive section is disassembled.
* When the OPC drum drive unit is replaced.
* When U2 trouble occurs.
* When the PCU MAIN PWB is replaced.
* When EEPROM on the PCU MAIN PWB is replaced.
* When the OPC drum is replaced.
* When the OPC drum is removed from the main unit.
* When the OPC drum drive section is disassembled.
* When the OPC drum drive unit is replaced.
* When U2 trouble occurs.
* When the PCU MAIN PWB is replaced.
* When EEPROM on the PCU MAIN PWB is replaced.
X
Y
R
F
*A
*A: Rough adjustment pattern
*B
*B: Fine adjustment pattern
*B
Direction A
Direction B
Magenta
Cyan
Yellow
C
Y
M
MX-1800N ADJUSTMENTS 6 – 12
7-A
OPC drum phase adjustment (Auto
adjustment)
adjustment)
1) Enter SIM50-22 mode.
2) Touch [ALL] key.
(The machine enters the OPC drum phase adjustment mode/
image registration adjustment (auto adjustment) mode, and
both adjustments are executed simultaneously in this mode.)
The OPC drum phase adjustment and the image registration
adjustment can be individually executed by [REGIST] button
and [DRUM POS] button. Since, however, the image registra-
tion adjustment must be executed when the OPC drum phase
adjustment is completed, both adjustment are executed in this
adjustment simultaneously.
image registration adjustment (auto adjustment) mode, and
both adjustments are executed simultaneously in this mode.)
The OPC drum phase adjustment and the image registration
adjustment can be individually executed by [REGIST] button
and [DRUM POS] button. Since, however, the image registra-
tion adjustment must be executed when the OPC drum phase
adjustment is completed, both adjustment are executed in this
adjustment simultaneously.
3) Touch [EXECUTE] key.
The OPC drum phase adjustment and the image registration
adjustment are executed automatically.
adjustment are executed automatically.
* After completion of the adjustment, the drum motor stops and
[EXECUTE] button returns to the normal display and the adjust-
ment result is displayed.
MAIN, SUB: Image regist adjustment value is displayed.
( ) is the difference from the previous adjustment value.
Example: This time 105.0, previous time 103.0: 105.0 (+2)
PHASE: OPC drum phase adjustment value is displayed.
( ) is the previous adjustment value.
Example: This time 90
ment result is displayed.
MAIN, SUB: Image regist adjustment value is displayed.
( ) is the difference from the previous adjustment value.
Example: This time 105.0, previous time 103.0: 105.0 (+2)
PHASE: OPC drum phase adjustment value is displayed.
( ) is the previous adjustment value.
Example: This time 90
°, previous time 45°: 3 (2)
* In case of an error, "ERROR" is displayed with the details.
7-B
OPC drum phase adjustment (Manual
adjustment)
adjustment)
1)
Enter SIM44-31 mode.
EXECUTE
0
SIMULATIONġ NO.50-22
TEST
CLOSE
EXECUTE
ġ
NOW EXECUTING …
0
SIMULATIONġ NO.50-22
TEST
CLOSE
EXECUTE
PRESS [EXECUTE] TO START
ERRORȇTONNER EMPTY
0
SIMULATION NO.50-22
TEST
AUTO ADJUSTMENT OF REGISTRATIONɕDLUM POSITION
EXECUTE
C
xxx (xx)
xxx (xx)
xxx (xx)
xxx (xx)
M
xxx (xx)
xxx (xx)
xxx (xx)
Y
xxx (xx)
xxx (xx)
xxx (xx)
1/1
CLOSE
REGIST
DRUM POS
ALL
Normal end
MAIN R
,MAIN F
SUB
PHASE
Abnormal end
AUTO ADJUSTMENT OF REGISTRATION & DLUM POSITION
AUTO ADJUSTMENT OF REGISTRATION & DLUM POSITION
OK
EXECUTE
EXECUTE
OK
0
A:
Aȇ x
Bȇ x
Ȉġ
PRINT MODEȇSETġ VALUE
Ȉġ
COLOR
SIMULATIONġ NO.44-31
DRUM POSITION SETTING
x
ġ
1
3
OK
TEST
EXECUTE
CLOSE
Cȇ x
Ȉ
PAPERSELECT
0
A:ġ
Aȇ x
Bȇ x
Ȉġ
PRINT MODEȇSETġ VALUE
Ȉġ
COLOR
SIMULATIONġ NO.44-31
DRUM POSITION SETTING
x
1
3 ȯ
TEST
CLOSE
Cȇ x
Ȉ
PAPERSELECT
EXECUTE
OK
0
A:
Aȇ x
Bȇ x
Ȉ
PRINT MODEȇSETġ VALUE
Ȉ
COLOR
SIMULATIONġ NO.44-31
DRUM POSITION SETTING
x
1
3
OK
TEST
EXECUTE
CLOSE
Cȇ x
Ȉ
PAPERSELECT
EXECUTE
EXECUTE
0
A:ġ
Aȇ x
Bȇ x
Ȉ
PRINT MODEȇ45Ɏ
Ȉ
COLOR
SIMULATIONġ NO.44-31
DRUM POSITION SETTING
x
ġ
1
3
TEST
EXECUTE
CLOSE
Cȇ x
Ȉ
PAPERSELECT
OK
0
A:ġ
Aȇ 1
Bȇ 2
Ȉ
PRINT MODEȇ45
Ȉ
COLOR
SIMULATIONġ NO.44-31
DRUM POSITION SETTING
1
1
3
OK
TEST
EXECUTE
CLOSE
Cȇ 2
Ȉ
10-key
or end of print
10-key
or end of print
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