Sharp MX-6500N / MX-7500N (serv.man19) Service Manual ▷ View online
MX-7500N ADJUSTMENTS AND SETTINGS 5 – 3
3. Details of adjustment
ADJ 1
Adjust the developing unit
1-A
Adjust the developing doctor gap
This adjustment must be performed in the following cases:
* The developing unit has been disassembled.
* When the print image density is low.
* When there is a blur on the print image.
* When there is unevenness in the print image density.
* The toner is excessively dispersed.
1)
Remove the developing unit from the main unit, and remove
the developing unit upper cover and the developing doctor
cover.
the developing unit upper cover and the developing doctor
cover.
2)
Loosen the developing doctor fixing screw.
3)
Insert a thickness gauge of 0.775mm in between 40mm -
70mm from the edge of the developing doctor.
70mm from the edge of the developing doctor.
4)
Push the developing doctor in the arrow direction, and tighten
the fixing screw of the developing doctor. (Perform the similar
procedure for the front frame and the rear frame.)
the fixing screw of the developing doctor. (Perform the similar
procedure for the front frame and the rear frame.)
5)
Check that the doctor gaps at two positions in 40mm - 70mm
from the both sides of the developing doctor are in the range of
0.775 +/- 0.05mm.
from the both sides of the developing doctor are in the range of
0.775 +/- 0.05mm.
* When inserting a thickness gauge, be careful not to scratch the
developing doctor and the developing roller.
1
2
70mm
70mm
40mm
40mm
70mm
70mm
40mm
40mm
MX-7500N ADJUSTMENTS AND SETTINGS 5 – 4
Note for use of a thickness gauge
- Do not insert the gauge diagonally.
- The gauge must pass freely.
- The advisable point of measurement is the MIN point of the MG
roller oscillation.
Marked point (A) on the drive side (left side) of the MG roller.
1-B
Adjust the developing roller main pole
position
position
This adjustment must be performed in the following cases:
* The developing unit has been disassembled.
* When the print image density is low.
* When there is a blur on the print image.
* When there is unevenness in the print image density.
* The toner is excessively dispersed.
1)
Remove the developing doctor cover, and place the develop-
ing unit on a flat surface.
ing unit on a flat surface.
2)
Attach a piece of string to a sewing needle or pin.
3)
Hold the thread and bring the needle near the developing
roller. (Do not use a paper clip because too heavy. It will not
provide a correct position.)
roller. (Do not use a paper clip because too heavy. It will not
provide a correct position.)
4)
Mark the developing roller surface on the extension line of the
needle with the needle at 2 - 3mm from the developing roller
surface. (Never touch the needle tip with the developing roller.)
needle with the needle at 2 - 3mm from the developing roller
surface. (Never touch the needle tip with the developing roller.)
5)
Measure the distance between the marking position and posi-
tion A of the developing unit frame, and check that it is 46.4 +/-
0.5mm.
tion A of the developing unit frame, and check that it is 46.4 +/-
0.5mm.
If the distance is not within the above range, adjust the devel-
oping roller main pole position in the following procedures.
oping roller main pole position in the following procedures.
6)
Loosen the fixing screw of the developing roller main pole
adjustment plate in the rear side of the developing unit, and
move the adjustment plate in the arrow direction to adjust.
adjustment plate in the rear side of the developing unit, and
move the adjustment plate in the arrow direction to adjust.
Repeat procedures 3) - 6) until the developing roller main pole
position comes to the specified range.
position comes to the specified range.
7)
After completion of the adjustment of the developing roller
main pole position, fix the developing roller main pole adjust-
ment plate with the fixing screw.
main pole position, fix the developing roller main pole adjust-
ment plate with the fixing screw.
A
2
㨪3mm
46.4 + 0.5mm
A
46.4+ 0.5mm
MX-7500N ADJUSTMENTS AND SETTINGS 5 – 5
1-C
Toner density control reference value
setting
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
Control voltage: 2.0V or below.
EE-EC
EC abnormality
Sensor output level: other than 1.65V +/-
0.04V
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.
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.
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:
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.
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.
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.
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.
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.
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
