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MX-C310 MX-C311 MX-C312 MX-C380 MX-C381 MX-C400 MX-C401 (serv.man125)
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127
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Service Manual
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Device
Copying Equipment / Revised Service Manual.
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Sharp MX-C310 / MX-C311 / MX-C312 / MX-C380 / MX-C381 / MX-C400 / MX-C401 (serv.man125) Service Manual ▷ View online

MX-C401  ADJUSTMENTS  4 – 2
3. Details of adjustment
 
ADJ 1
Adjusting high voltage values
 
1-A
Adjust the main charger grid voltage
This adjustment is needed in the following situations:
* When the MC high voltage power PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)
Enter the SIM 8-2 mode.
(4.3 Inch LCD model)
(8.5/7.0 Inch LCD model)
2)
Select an output mode and an item to be adjusted.
3)
Enter the adjustment value (specified value) in the middle
speed mode, and press [OK] key. (For the 4.3 Inch LCD
model, press the OSA shortcut key.)
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3 is outputted for 30sec and the set value is saved.
When [EXECUTE] key is pressed, the output is stopped.
Enter the adjustment value of each mode which is specified on
the label attached on the MC high voltage power PWB.
NOTE: Note that the adjustment value may differ depending on the
MC high voltage power PWB.
Since the adjustment value label is attached on the MC
high voltage PWB, the PWB must be removed in order to
check the adjustment value.
This is a troublesome procedure. Therefore, it is advisable
to put down the adjustment value in advance.
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.
NOTE: Since the high voltage output cannot be checked with a
digital multi meter in this model, a judgment of the output
must be made by checking the print image quality.
ADJ 15
Printer color balance/density 
adjustment
15A
Printer color balance adjustment (Auto adjustment)
67-24
15B
Printer color balance adjustment (Manual adjustment)
67-25
15C
Printer density adjustment (low density part density adjustment) (Normally unnecessary to 
adjust)
67-36
15D
Printer high density part desnsity correction setting (high density part tone gap 
countermeasure) (Normally unnecessary to the setting change)
67-34
15E
Auto color balance adjustment by the user (Printer color balance auto adjustment ENABLE 
setting and adjustment)
26-54
15F
Automatic copy/printer color balance and density adjustment (Automatic adjustment)
46-74
15G
Printer color balance adjustment (Automatic adjustment for each dither) 
(Normally unnecessary to adjust)
67-54
ADJ 16
Manual paper feed tray paper size (width) sensor adjustment
40-2
ADJ 17
Touch panel coordinate setting
65-1
ADJ 18
Image loss, void area, image off-
center, image magnification ratio 
auto adjustment with SIM50-28
18A
Print image main scanning direction image magnification ratio automatic adjustment
50-28
18B
Image off-center automatic adjustment (Document table mode)
50-28
18C
Copy lead edge image reference position adjustment, image off-center, sub scanning 
direction image magnification ratio automatic adjustment (Document table mode)
50-28
18D
SPF mode image off-center, image lead edge position, sub scanning direction image 
magnification ratio automatic adjustment (RSPF mode)
50-28
ADJ 19
Fusing paper guide position adjustment
Job No
Adjustment item list
Simulation
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Mode
Item/Display
Content
Setting range
MIDDLE
A
MIDDLE 
SPEED GB_K
K charging/grid bias set 
value at middle speed
150 - 850
B
MIDDLE 
SPEED GB_C
C charging/grid bias set 
value at middle speed
150 - 850
C
MIDDLE 
SPEED GB_M
M charging/grid bias set 
value at middle speed
150 - 850
D
MIDDLE 
SPEED GB_Y
Y charging/grid bias set 
value at middle speed
150 - 850
LOW
A
LOW SPEED 
GB_K
K charging/grid bias set 
value at low speed
150 - 850
B
LOW SPEED 
GB_C
C charging/grid bias set 
value at low speed
150 - 850
C
LOW SPEED 
GB_M
M charging/grid bias set 
value at low speed
150 - 850
D
LOW SPEED 
GB_Y
Y charging/grid bias set 
value at low speed
150 - 850
MX-C401  ADJUSTMENTS  4 – 3
 
1-B
Adjust the developing bias voltage
This adjustment is needed in the following situations:
* When the MC high voltage power PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)
Go through the modes specified in Simulation 8-1.
(4.3 Inch LCD model)
(8.5/7.0 inch LCD model)
2)
Select an output mode and an item to be adjusted.
3)
Enter the adjustment value (specified value) in the middle
speed mode, and press [OK] key. (For the 4.3 Inch LCD
model, press the OSA shortcut key.)
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3 is outputted for 30sec and the set value is saved.
When [EXECUTE] key is pressed, the output is stopped.
Enter the adjustment value of each mode which is specified on
the label attached on the MC high voltage power PWB.
NOTE: Note that the adjustment value may differ depending on the
MC high voltage power PWB.
Since the adjustment value label is attached on the MC
high voltage PWB, the PWB must be removed in order to
check the adjustment value.
This is a troublesome procedure. Therefore, it is advisable
to put down the adjustment value in advance.
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.
NOTE: Since the high voltage output cannot be checked with a
digital multi meter in this model, a judgment of the output
must be made by checking the print image quality.
 
1-C
Transfer voltage adjustment
This adjustment is needed in the following situations:
* When the TC high voltage PWB is replaced.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
1)
Go through the modes specified in Simulation 8-6.
(4.3 Inch LCD model)
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Mode
Item/Display
Content
Setting 
range
MIDDLE
A
MIDDLE SPEED 
DVB_K
K developing bias set 
value at middle speed
0-600
B
MIDDLE SPEED 
DVB_C
C developing bias set 
value at middle speed
0-600
C
MIDDLE SPEED 
DVB_M
M developing bias set 
value at middle speed
0-600
D
MIDDLE SPEED 
DVB_Y
Y developing bias set 
value at middle speed
0-600
LOW
A
LOW SPEED 
DVB_K
K developing bias set 
value at low speed
0-600
B
LOW SPEED 
DVB_C
C developing bias set 
value at low speed
0-600
C
LOW SPEED 
DVB_M
M developing bias set 
value at low speed
0-600
D
LOW SPEED 
DVB_Y
Y developing bias set 
value at low speed
0-600
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MX-C401  ADJUSTMENTS  4 – 4
(8.5/7.0 inch LCD model)
2)
Select an item to be adjusted.
Enter the adjustment value (specified value), and press [OK]
key. (For the 4.3 Inch LCD model, press the OSA shortcut
key.)
When [EXECUTE] key is pressed, the voltage entered in the
procedure 3 is outputted for 30sec and the set value is saved.
When [EXECUTE] key is pressed, the output is stopped.
By setting the default value (specified value), the specified out-
put is provided.
Item/Display
Content
Adjustment 
range
Default 
value
Actual output 
setting range
Default value 
of actual 
output value
A
TC1 LOW SPEED CL K
Primary 
transfer bias 
adjustment 
value
Color mode
K
Low speed 
mode
51 - 255
95
2 - 30
A
8
A
B
TC1 MIDDLE SPEED CL K
Middle speed 
mode
51 - 255
131
2 - 30
A
13
A
C
TC1 LOW SPEED CL C
C
Low speed 
mode
51 - 255
95
2 - 30
A
8
A
D
TC1 MIDDLE SPEED CL C
Middle speed 
mode
51 - 255
131
2 - 30
A
13
A
E
TC1 LOW SPEED CL M
M
Low speed 
mode
51 - 255
95
2 - 30
A
8
A
F
TC1 MIDDLE SPEED CL M
Middle speed 
mode
51 - 255
131
2 - 30
A
13
A
G
TC1 LOW SPEED CL Y
Y
Low speed 
mode
51 - 255
95
2 - 30
A
8
A
H
TC1 MIDDLE SPEED CL Y
Middle speed 
mode
51 - 255
131
2 - 30
A
13
A
I
TC1 LOW SPEED BW K
Black/White 
mode
K
Low speed 
mode
51 - 255
95
2 - 30
A
8
A
J
TC1 MIDDLE SPEED BW 
K
Middle speed 
mode
51 - 255
131
2 - 30
A
13
A
K
TC2 PLAIN CL SPX
Secondary 
transfer bias 
adjustment 
value
Color mode
Standard paper 
mode
Front surface 
mode
51 - 255
111
–2 - –80
A
–25
A
L
TC2 PLAIN CL DPX
Back surface 
mode
51 - 255
124
–2 - –80
A
–30
A
M
TC2 PLAIN BW SPX
Black/White 
mode
Front surface 
mode
51 - 255
111
–2 - –80
A
–25
A
N
TC2 PLAIN BW DPX
Back surface 
mode
51 - 255
111
–2 - –80
A
–25
A
O
TC2 HEAVY CL SPX
Color mode
Heavy paper 
mode
Front surface 
mode
51 - 255
93
–2 - –80
A
–10
A
P
TC2 HEAVY CL DPX 
Back surface 
mode
51 - 255
93
–2 - –80
A
–10
A
Q
TC2 HEAVY BW SPX
Black/White 
mode
Front surface 
mode
51 - 255
93
–2 - –80
A
–10
A
R
TC2 HEAVY BW DPX
Back surface 
mode
51 - 255
93
–2 - –80
A
–10
A
S
TC2 OHP CL
OHP
Color mode
51 - 255
85
–2 - –80
A
–8
A
T
TC2 OHP BW 
Black/White mode
51 - 255
85
–2 - –80
A
–8
A
U
TC2 ENVELOPE CL
Envelope
Color mode
51 - 255
124
–2 - –80
A
–30
A
V
TC2 ENVELOPE BW
Black/White mode
51 - 255
124
–2 - –80
A
–30
A
W
TC2 THIN CL
Thin paper
Color mode
51 - 255
111
–2 - –80
A
–25
A
X
TC2 THIN BW
Black/White mode
51 - 255
111
–2 - –80
A
–25
A
Y
TC2 GLOSSY CL
Gloss paper
Color mode
51 - 255
72
–2 - –80
A
–10
A
Z
TC2 GLOSSY BW
Black/White mode
51 - 255
72
–2 - –80
A
–10
A
AA
TC2 CLEANING
Cleaning mode
51 - 255
67
–2 - -80
A
–8
A
AB
TC2 CLEAN LOW SPD
Secondary 
transfer 
cleaning bias 
adjustment 
value
Low speed print mode
0 - 255
16
–100V - 1500V
0V
AC
TC2 CLEAN MIDDLE SPD
Middle speed print mode
0 - 255
16
–100V - 1500V
0V
AD
TC2 CLEAN CLEANING 
Cleaning mode
0 - 255
143
–100V - 1500V
800V
AE
PTC LOW SPEED CL
PTC current 
output 
adjustment 
value
Color mode
Low speed mode
0 - 255
133
0
A - –700A
–300
A
AF
PTC MIDDLE SPEED CL
Middle speed mode
0 - 255
133
0
A - –700A
–300
A
AG
PTC LOW SPEED BW
Black/White mode
Low speed mode
0 - 255
133
0
A - –700A
–300
A
AH
PTC MIDDLE SPEED BW
Middle speed mode
0 - 255
133
0
A - –700A
–300
A
MX-C401  ADJUSTMENTS  4 – 5
 
ADJ 2
Image density sensor (image 
registration sensor) adjustment
There are some parts variations in the image density sensor sec-
tion. Therefore, the absolute detection level differs in each
machine. To correct this, calibration is executed.
This adjustment is needed in the following situations:
* When the color image density sensor (image registration sensor
F) is replaced.
* When the image registration sensor unit is replace.
* U2 trouble has occurred.
* The PCU PWB has been replaced.
* The EEPROM of the PCU PWB has been replaced.
The targets of the adjustment are the color image density sensor
(image registration sensor F) and the black image density sensor
(image registration sensor R). There are following adjustment
methods.
* Color image density sensor (image registration sensor F) calibra-
tion SIM44-13
* Color image density sensor (Image registration sensor F) calibra-
tion value setting (SIM44-61)
* Black image density sensor (image registration sensor R) cali-
bration SIM44-2
NOTE: The color image density sensor detects color image density
and image registration on front frame side, the black image
density sensor detects black image density and image reg-
istration on rear frame side. That is, two functions is
assigned to each one sensor.
Before executing this adjustment, check to confirm the fol-
lowing items.
* Check to confirm that the color image density sensor (image reg-
istration sensor F) and the black image density sensor (image
registration sensor R)  are 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.
 
2-A
Color image density sensor (image 
registration sensor F) calibration
Perform the color image density sensor (image registration sensor
F) calibration in one of the following methods.
* Color image density sensor (Image registration sensor F) calibra-
tion value setting (Method by SIM44-61)
When the registration sensor unit is replaced, the calibration
value is set manually with this method. The calibration jig is not
required.
When, however, the color image density senor itself is replaced,
use the calibration jig and execute SIM44-13 to perform calibra-
tion.
* Color image density sensor (Image registration sensor F) calibra-
tion value setting (Method by SIM44-13)
When the color image density sensor itself is replaced, use the
calibration jig and perform calibration with this method.
(Color image density sensor (Image registration sensor F) cal-
ibration value setting (Method by SIM44-61))
1)
Enter the SIM44-61 mode.
(4.3 Inch LCD model)
(8.5/7.0 inch LCD model)
AI
CASE VOLT LOW CL
PTC case 
voltage 
adjustment 
value
Color mode
Low speed mode
0 - 255
0
0V - –1000V
0V
AJ
CASE VOLT MID CL
Middle speed mode
0 - 255
0
0V - –1000V
0V
AK
CASE VOLT LOW BW
Black/White mode
Low speed mode
0 - 255
0
0V - –1000V
0V
AL
CASE VOLT MID BW
Middle speed mode
0 - 255
0
0V - –1000V
0V
AM
PEEL VOLT LOW CL
Separation 
discharge 
adjustment 
value
Color mode
Low speed mode
51 - 255
200
 –50 - –3000V
–2200V
AN
PEEL VOLT MIDDLE CL
Middle speed mode
51 - 255
200
 –50 - –3000V
–2200V
AO
PEEL VOLT LOW BW
Black/White mode
Low speed mode
51 - 255
200
 –50 - –3000V
–2200V
AP
PEEL VOLT MIDDLE BW
Middle speed mode
51 - 255
200
 –50 - –3000V
–2200V
Item/Display
Content
Adjustment 
range
Default 
value
Actual output 
setting range
Default value 
of actual 
output value
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