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Model
MX-6500N MX-7500N (serv.man19)
Pages
98
Size
5.74 MB
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PDF
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Service Manual
Brand
Device
Copying Equipment / Section 5 Adjustments and Settings
File
mx-6500n-mx-7500n-sm19.pdf
Date

Sharp MX-6500N / MX-7500N (serv.man19) Service Manual ▷ View online

MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 5
 
1-C
Toner density control reference value 
setting
This adjustment must be performed in the following cases:
* When developer is replaced.
CAUTION: Be sure to execute this adjustment only when developer
is replaced. Never execute it in the other cases.
CAUTION: Make sure Toner cartridges are not installed in the
machine.
CAUTION: When replacing developer, always replace all the three
colors of Yellow, Magenta, and Cyan.
If only one color is replaced, color balance may be
adversely affected. Black developer can be replaced
individually.
CAUTION: When not replacing the developer, do not execute
SIM25-2.
CAUTION: During execution of this adjustment, do not insert the
toner cartridge.
CAUTION: When SIM25-2 is executed with a toner cartridge
inserted, "Toner Check" is displayed to disable the exe-
cution button. In this case, remove the toner cartridge
and execute SIM25-2 again.
1)
With the front cabinet open, enter SIM25-2.
2)
Close the front cabinet.
3)
Select a developing unit to be adjusted.
4)
When [EXECUTE] key is pressed, it is highlighted. The devel-
oping roller rotates, and the toner density sensor detects toner
density, and the output value is displayed.
The above operation is executed for 3 minutes, and the aver-
age value of the toner density sensor detection level is set
(saved) as the reference toner density control value.
When the reference toner density control adjustment operation
is completed, [EXECUTE] key returns to normal from highlight.
This makes known about whether the adjustment operation is
completed or not.
The above operation is executed each of the lower speed
mode and the middle speed mode, and the reference toner
density control value is set for each of them.
CAUTION: If the operation is interrupted within 3 minutes, the
adjustment result is not reflected.
When [EXECUTE] key is pressed during rotation, the
operation is stopped and [EXECUTE] key returns to the
normal display.
If [EE-EU], [EE-EL], or [EE-EG] is displayed, setting of
the reference toner density control value is not com-
pleted normally.
Error 
display
Error name
Detail of error
EE-EL
EL abnormality
Sensor output level: 0.99V or below. If not, 
Control voltage: 8.0V or above.
EE-EU
EU abnormality
Sensor output level: 2.28V or above. If not, 
Control voltage: 2.0V or below.
EE-EC
EC abnormality
Sensor output level: other than 1.65V +/- 
0.04V
EXECUTE 
Adjustment completed
EXECUTE 
or INTERRUPT
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MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 6
 
ADJ 2
High voltage adjustment
 
2-A
Adjust the main charger grid voltage
This adjustment must be performed in the following cases:
* 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.
2)
Select an output mode to be adjusted with the mode key and the scroll key.
3)
Enter the adjustment value (specified value) of the middle speed mode and press [OK] key.
Remark:
Normally when the default value is set, the specified voltage is out-
putted.
The adjustment value of each color mode is specified on the label
attached to the MC high voltage power PWB. Enter that value.
GBK:XXX GBC:XXX  GBM:XXX  GBY:XXX
The default values of GB specified for each model must be
changed as follows:
65cpm machine: + 0
75cpm machine: + 5
When [EXECUTE] key is pressed, the voltage entered in the proce-
dure 3) is outputted for 30 sec and the set value is saved.
When [EXECUTE] key is pressed again, the output is stopped.
 
CAUTION: 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 advis-
able to put down the adjustment value in advance.
 
When the adjustment value (specified value) of the mid-
dle speed mode is set, the adjustment values of the
other modes are automatically set according to the mid-
dle speed mode setting in a certain relationship.
CAUTION: Since the high voltage output cannot be checked with a
digital multi meter in this model, a judgment of the out-
put must be made by checking the print image quality.
EXECUTE
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10-key
Item/Display (mode)
Content
Setting 
range
Default 
value
Actual voltage
65cpm 
machine
75cpm 
machine
MIDDLE
A
MIDDLE SPEED GB_K
K charging/grid bias set value at middle speed
150 - 850
635
-640V +/- 5V
-645V +/- 5V
B
MIDDLE SPEED GB_C
C charging/grid bias set value at middle speed
150 - 850
635
-640V +/- 5V
-645V +/- 5V
C
MIDDLE SPEED GB_M
M charging/grid bias set value at middle speed
150 - 850
635
-640V +/- 5V
-645V +/- 5V
D
MIDDLE SPEED GB_Y
Y charging/grid bias set value at middle speed
150 - 850
635
-640V +/- 5V
-645V +/- 5V
LOW
A
LOW1 SPEED GB_K
K charging/grid bias set value at low speed 1
150 - 850
625
-625V +/- 5V
-625V +/- 5V
B
LOW1 SPEED GB_C
C charging/grid bias set value at low speed 1
150 - 850
625
-625V +/- 5V
-625V +/- 5V
C
LOW1 SPEED GB_M
M charging/grid bias set value at low speed 1
150 - 850
625
-625V +/- 5V
-625V +/- 5V
D
LOW1 SPEED GB_Y
Y charging/grid bias set value at low speed 1
150 - 850
625
-625V +/- 5V
-625V +/- 5V
E
LOW2 SPEED GB_K
K charging/grid bias set value at low speed 2
150 - 850
620
-620V +/- 5V
-620V +/- 5V
F
LOW2 SPEED GB_C
C charging/grid bias set value at low speed 2
150 - 850
620
-620V +/- 5V
-620V +/- 5V
G
LOW2 SPEED GB_M
M charging/grid bias set value at low speed 2
150 - 850
620
-620V +/- 5V
-620V +/- 5V
H
LOW2 SPEED GB_Y
Y charging/grid bias set value at low speed 2
150 - 850
602
-620V +/- 5V
-620V +/- 5V
MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 7
 
2-B
Adjust the developing bias voltage
This adjustment must be performed in the following cases:
* 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 8-1 mode.
2)
Select an output mode to be adjusted with the mode key and the scroll key.
3)
Enter the adjustment value (specified value) of the middle speed mode and press [OK] key.
Remark: 
Normally when the default value is set, the specified voltage is out-
putted.
The adjustment value of each color mode is specified on the label
attached to the MC high voltage power PWB. Enter that value.
DVK:XXX DVC:XXX  DVM:XXX  DVY:XXX
When [EXECUTE] key is pressed, the voltage entered in the proce-
dure 3) is outputted for 30 sec and the set value is saved.
When [EXECUTE] key is pressed again, the output is stopped.
CAUTION: 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 advis-
able to put down the adjustment value in advance.
 
When the adjustment value (specified value) of the mid-
dle speed mode is set, the adjustment values of the
other modes are automatically set according to the mid-
dle speed mode setting in a certain relationship.
CAUTION: Since the high voltage output cannot be checked with a
digital multi meter in this model, a judgment of the out-
put must be made by checking the print image quality.
EXECUTE
EXECUTE 
 
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or after 30 sec.
Item/Display (mode)
Content
Setting 
range
Default 
value
Actual voltage
65cpm 
machine
75cpm 
machine
MIDDLE
A
MIDDLE SPEED DVB_K
K developing bias set value at middle speed
0 - 600
450
-450V +/- 5V
-450V +/- 5V
B
MIDDLE SPEED DVB_C
C developing bias set value at middle speed
0 - 600
450
-450V +/- 5V
-450V +/- 5V
C
MIDDLE SPEED DVB_M
M developing bias set value at middle speed
0 - 600
450
-450V +/- 5V
-450V +/- 5V
D
MIDDLE SPEED DVB_Y
Y developing bias set value at middle speed
0 - 600
450
-450V +/- 5V
-450V +/- 5V
LOW
A
LOW1 SPEED DVB_K
K developing bias set value at low speed 1
0 - 600
450
-450V +/- 5V
-450V +/- 5V
B
LOW1 SPEED DVB_C
C developing bias set value at low speed 1
0 - 600
450
-450V +/- 5V
-450V +/- 5V
C
LOW1 SPEED DVB_M
M developing bias set value at low speed 1
0 - 600
450
-450V +/- 5V
-450V +/- 5V
D
LOW1 SPEED DVB_Y
Y developing bias set value at low speed 1
0 - 600
450
-450V +/- 5V
-450V +/- 5V
E
LOW2 SPEED DVB_K
K developing bias set value at low speed 2
0 - 600
450
-450V +/- 5V
-450V +/- 5V
F
LOW2 SPEED DVB_C
C developing bias set value at low speed 2
0 - 600
450
-450V +/- 5V
-450V +/- 5V
G
LOW2 SPEED DVB_M
M developing bias set value at low speed 2
0 - 600
450
-450V +/- 5V
-450V +/- 5V
H
LOW2 SPEED DVB_Y
Y developing bias set value at low speed 2
0 - 600
450
-450V +/- 5V
-450V +/- 5V
MX-7500N  ADJUSTMENTS AND SETTINGS  5 – 8
 
2-C
Transfer current/voltage adjustment
This adjustment must be performed in the following cases:
* When the primary transfer high voltage power PWB or Second-
ary transfer 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 8-6 mode.
2)
Select a mode to be adjusted with the scroll key.
3)
Enter an adjustment value (specified value) and press [OK] key. 
By setting the default value (specified value), the specified voltage is outputted.
When [EXECUTE] key is pressed, the transfer voltage is outputted.
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10-key
Item/Display
Content
Setting 
range
Default value
65cpm 
machine
75 cpm 
machine
A
TC1 LOW 1 SPEED CL K
Primary 
transfer bias 
reference value
Color
K
Low speed 1 
51 - 255
91
91
B
TC1 LOW 2 SPEED CL K
Low speed 2
51 - 255
95
95
C
TC1 MIDDLE SPEED CL K
Middle speed 
51 - 255
99
99
D
TC1 LOW 1 SPEED CL C
C
Low speed 1 
51 - 255
91
91
E
TC1 LOW 2 SPEED CL C
Low speed 2
51 - 255
95
95
F
TC1 MIDDLE SPEED CL C
Middle speed 
51 - 255
99
99
G
TC1 LOW 1 SPEED CL M
M
Low speed 1 
51 - 255
91
91
H
TC1 LOW 2 SPEED CL M
Low speed 2
51 - 255
95
95
I
TC1 MIDDLE SPEED CL M
Middle speed 
51 - 255
99
99
J
TC1 LOW 1 SPEED CL Y
Y
Low speed 1 
51 - 255
91
91
K
TC1 LOW 2 SPEED CL Y
Low speed 2
51 - 255
95
95
L
TC1 MIDDLE SPEED CL Y
Middle speed 
51 - 255
99
99
M
TC1 LOW 1 SPEED BW K
Black and 
white
K
Low speed 1 
51 - 255
91
91
N
TC1 LOW 2 SPEED BW K
Low speed 2
51 - 255
95
95
O
TC1 MIDDLE SPEED BW K
Middle speed 
51 - 255
99
99
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