Sharp MX-1800N (serv.man14) Service Manual ▷ View online
MX-1800N ADJUSTMENTS 6 – 5
Remark: By setting the default value, the specified voltage is
normally outputted.
The adjustment value of each color mode is specified on the label
attached to the MC/DV high voltage power PWB. Enter that value.
attached to the MC/DV high voltage power PWB. Enter that value.
GBK:XXX GBC:XXX GBM:XXX GBY:XXX
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.
To adjust all the modes individually, first adjust the middle speed
mode, and then adjust the other mode.
If the middle speed mode is adjusted after adjustment of all the
modes individually, the adjustment values of the other modes are
automatically changed. Use care for that.
Therefore, unless there may be an abnormality in the output volt-
age, there is no need to check the output value.
If it must be checked that the normal voltage is outputted or if an
adjustment is required by referring to the output voltage, follow the
procedures below.
1) Remove the main unit rear cover.
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.
To adjust all the modes individually, first adjust the middle speed
mode, and then adjust the other mode.
If the middle speed mode is adjusted after adjustment of all the
modes individually, the adjustment values of the other modes are
automatically changed. Use care for that.
Therefore, unless there may be an abnormality in the output volt-
age, there is no need to check the output value.
If it must be checked that the normal voltage is outputted or if an
adjustment is required by referring to the output voltage, follow the
procedures below.
1) Remove the main unit rear cover.
2)
Open the PWB holder.
3)
Enter SIM8-2 mode.
4)
Select an output mode to be adjusted with the mode key and
the scroll key.
the scroll key.
5)
Check the relationship between the pin No. of the connector
CNMON on the MC/DV high voltage PWB and each adjust-
ment mode.
CNMON on the MC/DV high voltage PWB and each adjust-
ment mode.
6)
Apply a digital multi-meter to the connector CNMON pin on the
MC/DV high voltage PWB corresponding to the adjusted
mode.
MC/DV high voltage PWB corresponding to the adjusted
mode.
7)
Touch [EXECUTE] key.
The main charger grid voltage is outputted for 30sec.
If this procedure is executed for a long time, the OPC drum
and the developing roller may be adversely affected. Use this
procedure as short as possible.
If possible, it is recommendable to use an unnecessary devel-
oping unit and an unnecessary OPC drum for this adjustment.
The main charger grid voltage is outputted for 30sec.
If this procedure is executed for a long time, the OPC drum
and the developing roller may be adversely affected. Use this
procedure as short as possible.
If possible, it is recommendable to use an unnecessary devel-
oping unit and an unnecessary OPC drum for this adjustment.
8)
Check the monitor voltage with the digital multi-meter.
If the monitor voltage is not in the range of the specified values
shown in the table above, change the adjustment value and
adjust again. If the specified value voltage is not obtained even
though the adjustment value is changed, the following parts
may be defective.
MC/DV high voltage PWB
PCU PWB
Developing unit
OPC drum unit
High voltage circuit electrode
If the monitor voltage is not in the range of the specified values
shown in the table above, change the adjustment value and
adjust again. If the specified value voltage is not obtained even
though the adjustment value is changed, the following parts
may be defective.
MC/DV high voltage PWB
PCU PWB
Developing unit
OPC drum unit
High voltage circuit electrode
4-B
Developing bias voltage adjustment
This adjustment must be executed in the following cases:
* When MC/DV high voltage power PWB is replaced.
* When U2 trouble occurs.
* When PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
* When MC/DV high voltage power PWB is replaced.
* When U2 trouble occurs.
* When PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
Item Mode
Adjustment value
Monitor (MC/DV high voltage PWB)
Actual
voltage
Adjustment
range
Default
value
Monitor voltage
(Specified value)
Connector
Pin
No.
No.
MIDDLE
A
MIDDLE SPEED GB_K
K
Main charger grid voltage
(Middle speed mode)
(Middle speed mode)
230 – 850
615
53.6
± 1.61V
CNMON
8
–615V
B
MIDDLE SPEED GB_C
C
Main charger grid voltage
(Middle speed mode)
(Middle speed mode)
230 – 850
615
53.6
± 1.61V
CNMON
6
–615V
C
MIDDLE SPEED GB_M
M
Main charger grid voltage
(Middle speed mode)
(Middle speed mode)
230 – 850
615
53.6
± 1.61V
CNMON
4
–615V
D
MIDDLE SPEED GB_Y
Y
Main charger grid voltage
(Middle speed mode)
(Middle speed mode)
230 – 850
615
53.6
± 1.61V
CNMON
2
–615V
LOW
A
LOW SPEED GB_K
K
Main charger grid voltage
(Low speed mode)
(Low speed mode)
230 – 850
605
52.7
± 1.58V
CNMON
8
–605V
B
LOW SPEED GB_C
C
Main charger grid voltage
(Low speed mode)
(Low speed mode)
230 – 850
605
52.7
± 1.58V
CNMON
6
–605V
C
LOW SPEED GB_M
M
Main charger grid voltage
(Low speed mode)
(Low speed mode)
230 – 850
605
52.7
± 1.58V
CNMON
4
–605V
D
LOW SPEED GB_Y
Y
Main charger grid voltage
(Low speed mode)
(Low speed mode)
230 – 850
605
52.7
± 1.58V
CNMON
2
–605V
1
2
MX-1800N ADJUSTMENTS 6 – 6
1) Enter SIM8-1 mode.
2)
Select an output mode to be adjusted with the mode key and
the scroll key.
the scroll key.
3)
Enter the adjustment value (specified value) of the middle
speed mode and touch [OK] key.
speed mode and touch [OK] key.
Remark: By setting the default value, the specified voltage is
normally outputted.
The adjustment value of each color mode is specified on the label
attached to the MC/DV high voltage power PWB. Enter that value.
attached to the MC/DV high voltage power PWB. Enter that value.
DVK:XXX DVC:XXX DVM:XXX DVY:XXX
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.
To adjust all the modes individually, first adjust the middle speed
mode, then adjust the other mode.
If the middle speed mode is adjusted after adjustment of all the
modes individually, the adjustment values of the other modes are
automatically changed. Use care for that.
When the adjustment value (specified value) of the middle speed
mode is set, the adjustment values of the other modes are auto-
matically set according to the middle speed mode setting in a cer-
tain relationship.
To adjust all the modes individually, first adjust the middle speed
mode, then adjust the other mode.
If the middle speed mode is adjusted after adjustment of all the
modes individually, the adjustment values of the other modes are
automatically changed. Use care for that.
Therefore, unless there may be an abnormality in the output volt-
age, there is no need to check the output value.
If it must be checked that the normal voltage is outputted or if an
adjustment is required by referring to the output voltage, follow the
procedures below.
1)
age, there is no need to check the output value.
If it must be checked that the normal voltage is outputted or if an
adjustment is required by referring to the output voltage, follow the
procedures below.
1)
Remove the main unit rear cover.
EXECUTE
EXECUTE
0
A:
Aȇxxx
Bȇxxx
Cȇxxx
Ȉġ
MIDDLE SPEED DVB_K
Ȉġ
MIDDLE SPEED DVB_C
Ȉġ
MIDDLE SPEED DVB_M
SIMULATIONġ NO.08-01
DV SETTING AND OUTPUT
xxx
ġ
0
700
OK
TEST
CLOSE
EXECUTE
Dȇxxx
Ȉġ
MIDDLE SPEED DVB_Y
LOW
MIDDLE
0
A:
Aȇxxx
Bȇxxx
Cȇxxx
Ȉ
MIDDLE SPEED DVB_K
Ȉ
MIDDLE SPEED DVB_C
Ȉ
MIDDLE SPEED DVB_M
SIMULATIONġ NO.08-01
DV SETTING AND OUTPUT
xxx
0
700
OK
TEST
CLOSE
EXECUTE
Dȇxxx
Ȉ
MIDDLE SPEED DVB_Y
LOW
MIDDLE
10-key
or after 30 sec.
Item
Mode
Adjustment value
Monitor (MC/DV high voltage PWB)
Actual
voltage
Adjustment
range
Default
value
Monitor voltage
(Specified value)
Connector
Pin
No.
No.
MIDDLE
A
MIDDLE SPEED DVB_K
K
Developing bias voltage
(Middle speed mode)
(Middle speed mode)
0 – 700
450
12.1
± 0.36V
CNMON
7
–450V
B
MIDDLE SPEED DVB_C
C
Developing bias voltage
(Middle speed mode)
(Middle speed mode)
0 – 700
450
12.1
± 0.36V
CNMON
5
–450V
C
MIDDLE SPEED DVB_M
M
Developing bias voltage
(Middle speed mode)
(Middle speed mode)
0 – 700
450
12.1
± 0.36V
CNMON
3
–450V
D
MIDDLE SPEED DVB_Y
Y
Developing bias voltage
(Middle speed mode)
(Middle speed mode)
0 – 700
450
12.1
± 0.36V
CNMON
1
–450V
LOW
A
LOW SPEED DVB_K
K
Developing bias voltage
(Low speed mode)
(Low speed mode)
0 – 700
430
11.4
± 0.34V
CNMON
7
–430V
B
LOW SPEED DVB_C
C
Developing bias voltage
(Low speed mode)
(Low speed mode)
0 – 700
430
11.4
± 0.34V
CNMON
5
–430V
C
LOW SPEED DVB_M
M
Developing bias voltage
(Low speed mode)
(Low speed mode)
0 – 700
430
11.4
± 0.34V
CNMON
3
–430V
D
LOW SPEED DVB_Y
Y
Developing bias voltage
(Low speed mode)
(Low speed mode)
0 – 700
430
11.4
± 0.34V
CNMON
1
–430V
1
2
MX-1800N ADJUSTMENTS 6 – 7
2) Open the PWB frame.
3) Enter SIM8-1 mode.
4) Select an output mode to be adjusted with the mode key and
3) Enter SIM8-1 mode.
4) Select an output mode to be adjusted with the mode key and
the scroll key.
5) Check the relationship between the pin No. of the connector
CNMON on the MC/DV high voltage PWB and each adjust-
ment mode.
ment mode.
6) Apply a digital multi-meter to the connector CNMON pin on the
MC/DV high voltage PWB corresponding to the adjusted
mode.
mode.
7) Touch [EXECUTE] key.
The developing bias voltage is outputted for 30sec.
8) Check the monitor voltage with the digital multi-meter.
If the monitor voltage is not in the range of the specified values
shown in the table above, change the adjustment value and
adjust again. If the specified value voltage is not obtained even
though the adjustment value is changed, the following parts
may be defective.
MC/DV high voltage PWB
PCU PWB
Developing unit
OPC drum unit
High voltage circuit electrode
shown in the table above, change the adjustment value and
adjust again. If the specified value voltage is not obtained even
though the adjustment value is changed, the following parts
may be defective.
MC/DV high voltage PWB
PCU PWB
Developing unit
OPC drum unit
High voltage circuit electrode
4-C
Transfer voltage adjustment
This adjustment must be executed in the following cases:
* When the TC high voltage power PWB is replaced.
* When U2 trouble occurs.
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
1)
* When the TC high voltage power PWB is replaced.
* When U2 trouble occurs.
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
1)
Enter SIM8-6 mode.
2)
Select a mode to be adjusted with the scroll key.
3)
Enter an adjustment value (specified value) and touch [OK]
key.
By setting the default value (specified value), the specified
voltage is outputted.
When [EXECUTE] key is touched, the transfer voltage is out-
putted.
key.
By setting the default value (specified value), the specified
voltage is outputted.
When [EXECUTE] key is touched, the transfer voltage is out-
putted.
CNMON
1
EXECUTE
EXECUTE
A:ġ
Aȇxxx
Bȇxxx
Cȇxxx
Ȉġ
TC1 LOW SPEEDġġCL K
Ȉġ
TC1 MIDDLE SPEED CL K
Ȉġ
TC1 LOW SPEED CL CMY
SIMULATIONġ NO.08-06
THV SETTING AND OUTPUT
xxx
0 255
OK
TEST
EXECUTE
0
Dȇxxx
Ȉ
TC1 MIDDLE SPEED_CL CMY
CLOSE
A:ġ
Aȇxxx
Bȇxxx
Cȇxxx
Ȉ
TC1 LOW SPEED CL K
Ȉ
TC1 MIDDLE SPEED CL K
Ȉ
TC1 LOW SPEED CLġ CMY
SIMULATIONġ NO.08-06
THV SETTING AND OUTPUT
xxx
ġ
0 255
OK
TEST
EXECUTE
0
Dȇxxx
Ȉ
TC1 MIDDLE SPEED_CL CMY
CLOSE
10-key
or after 30 sec.
Item
Display
Content
Setting
range
Default
value
Actual output
setting range
Default
value
Actual
output value
A
TC1 LOW SPEED CL K
Primary transfer
bias reference
value
bias reference
value
COLOR
K
Low speed
0 to 255
232
–500V to 5000V
4500V
B
TC1 MIDDLE SPEED CL K
Middle speed
0 to 255
232
–500V to 5000V
4500V
C
TC1 LOW SPEED CL CMY
CMY
Low speed
0 to 255
139
–500V to 5000V
2500V
D
TC1 MIDDLE SPEED CL CMY
Middle speed
0 to 255
139
–500V to 5000V
2500V
E
TC1 LOW SPEED BW K
BLACK
K
Low speed
0 to 255
232
–500V to 5000V
4500V
F
TC1 MIDDLE SPEED BW K
Middle speed
0 to 255
232
–500V to 5000V
4500V
G
TC2 PLAIN CL SPX
Secondary transfer
bias reference
value
bias reference
value
COLOR
Normal
paper
Front surface
51 to 255
100
2
µA to 45µA
12.5
µA
H
TC2 PLAIN CL DPX
Back surface
51 to 255
100
2
µA to 45µA
12.5
µA
I
TC2 PLAIN BW SPX
BLACK
Front surface
51 to 255
90
2
µA to 45µA
10
µA
J
TC2 PLAIN BW DPX
Back surface
51 to 255
90
2
µA to 45µA
10
µA
K
TC2 HEAVY1 CL SPX
COLOR
Heavy paper
51 to 255
69
2
µA to 45µA
6
µA
L
TC2 HEAVY1 BW SPX
BLACK
51 to 255
69
2
µA to 45µA
6
µA
M
TC2 OHP CL
COLOR
OHP
51 to 255
60
2
µA to 45µA
4
µA
N
TC2 OHP BW
BLACK
51 to 255
60
2
µA to 45µA
4
µA
O
TC2 ENVELOPE CL
COLOR
Envelope
51 to 255
184
2
µA to 45µA
30
µA
P
TC2 ENVELOPE BW
BLACK
51 to 255
184
2
µA to 45µA
30
µA
Q
TC2 CLEANING
Cleaning process
51 to 255
79
2
µA to 45µA
8
µA
R
TC2 CLEAN LOW SPD
Secondary transfer
cleaning bias
reference value
cleaning bias
reference value
Low speed print
51 to 255
72
–50V to –1500V
–200V
S
TC2 CLEAN MIDDLE SPD
Middle speed print
51 to 255
72
–50V to –1500V
–200V
T
TC2 CLEAN CLEANING
Cleaning
51 to 255
156
–50V to –1500V
–800V
MX-1800N ADJUSTMENTS 6 – 8
ADJ 5
Image density sensor, image
registration sensor adjustment
registration sensor adjustment
There are some assembly variations in the image density sensor
section. Therefore, the absolute detection level differs in each
machine. To correct this, calibration is executed.
This adjustment must be executed in the following cases:
* When the image density sensor is replaced.
* When the image resist sensor is replaced.
* When U2 trouble occurs.
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
The targets of the adjustment are the color image density sensor,
the black image density sensor, and the image registration sensor.
There are following adjustment methods.
* Color image density sensor adjustment (Calibration with the
section. Therefore, the absolute detection level differs in each
machine. To correct this, calibration is executed.
This adjustment must be executed in the following cases:
* When the image density sensor is replaced.
* When the image resist sensor is replaced.
* When U2 trouble occurs.
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
The targets of the adjustment are the color image density sensor,
the black image density sensor, and the image registration sensor.
There are following adjustment methods.
* Color image density sensor adjustment (Calibration with the
adjustment jig) SIM44-13
* Black image density sensor and the image registration sensor
adjustment SIM44-2
NOTE: Before executing this adjustment, check to confirm the fol-
lowing items.
* Check to confirm that the color image density sensor, the black
image density sensor, and the image registration sensor are
clean.
clean.
* Check to confirm that the image density sensor calibration plate
is clean.
* Check to confirm that the transfer belt is clean and free from
scratches.
5-A
Color image density sensor calibration
1) Open the front cabinet of the main unit, and remove the waste
toner box.
2) Remove the primary transfer unit fixing screw.
3) Turn to the transfer belt tension release cam and release the
primary transfer belt tension.
NOTE: When the transfer belt tension of the primary transfer
unit is released manually, turn on the power again after com-
pletion of the work. (Power OFF-ON) This procedure initializes
the transfer roller to return it to the home position.
unit is released manually, turn on the power again after com-
pletion of the work. (Power OFF-ON) This procedure initializes
the transfer roller to return it to the home position.
4)
Open the right cover unit (secondary transfer unit section).
5)
Open the process front cover, and pull out the primary transfer
belt unit.
belt unit.
6)
Install the image density sensor calibration jig (UKOG-
0318FCZZ) to the sensor housing section.
Engage the pawl (A) in the sensor housing groove, and slide it
to the rear frame side.
0318FCZZ) to the sensor housing section.
Engage the pawl (A) in the sensor housing groove, and slide it
to the rear frame side.
7)
Turn on the power and enter SIM44-13 mode.
8)
Close the right cover unit (secondary transfer unit section).
9)
Install the waste toner bottle to the main unit.
10) Close the front cabinet.
11) Touch [EXECUTE] key.
11) Touch [EXECUTE] key.
Color image sensor calibration is automatically executed.
When the operation is completed, the adjustment result is dis-
played and [EXECUTE] key returns to the normal display.
When the operation is completed, the adjustment result is dis-
played and [EXECUTE] key returns to the normal display.
UN LOCK
A
A
A
EXECUTE
EXECUTE
0
SIMULATION㩷 NO.44-13
TEST
PATCH SEAL ADJUSTMENT
EXECUTE
xxx
:
PCS CL DARK
xxx
:
xxx
xxx
xxx
xxx
:
1/1
CLOSE
0
SIMULATION㩷 NO.44-13
TEST
PATCH SEAL ADJUSTMENT
EXECUTE
PCS CL CARB OUT :
PCS CL DARK
:
PCS CL LED ADJ
:
1/1
CLOSE
or when the color sensor
adjustment is completed
PCS CL CARB OUT
PCS CL LED ADJ
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