Sharp MX-M350N / MX-M350U / MX-M450N / MX-M450U (serv.man12) Service Manual ▷ View online
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 17
C. Operational descriptions
Electrostatic latent images formed on the OPC drum by the Laser
unit (LD image light) are converted into visible images by toner.
unit (LD image light) are converted into visible images by toner.
Toner in the developing unit is stirred by the mixing roller.
When toner is stirred, it is negatively charged by mechanical fric-
tion.
tion.
The developing bias voltage (negative) is applied to the developing
roller.
roller.
Negatively charged toner is attracted and attached to the area on
the OPC drum where negative voltage is reduced by exposure.
the OPC drum where negative voltage is reduced by exposure.
On the other hand, the negative voltage at an area where expo-
sure is not made is higher than the developing bias voltage, and
toner is not attached.
sure is not made is higher than the developing bias voltage, and
toner is not attached.
Aluminum
layer
CGL
CTL
Drum
-500V
(-470V)
(-470V)
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 18
D. Maintenance and parts replacement
(1) Maintenance list
(2) Maintenance and parts replacement
a. DV cartridge
1) Release the lock, and pull out the left door.
2) Open the front door, and remove the screw.
3) Put down the DV guide handle, release the lock, and remove
the DV cartridge.
Unit name
No.
Part name
When
calling
100K 200K 300K 400K 500K 600K 700K 800K
Remark
Developing
section
section
1
Developer
▲
▲
▲
▲
▲
▲
▲
▲
Supplied when installing
2
DV blade
✕
▲
✕
▲
✕
▲
✕
▲
P/G No.: [11]-55
3
DV side seal F
✕
▲
✕
▲
✕
▲
✕
▲
P/G No.: [11]-38
4
DV side seal R
✕
▲
✕
▲
✕
▲
✕
▲
P/G No.: [11]-43
5
Toner cartridge
Attached when installing./
750g, user replacement for every 35K.
750g, user replacement for every 35K.
1
2
4
3
5
No.
Unit
Parts
a
DV cartridge
1
Developer
▲
2
DV blade
✕
3
DV side seal F
✕
4
DV side seal R
✕
5
Toner density sensor
6
Temperature/humidity sensor
b
1
Toner cartridge
2
Toner motor
a-1
a
a-3
b-1
a-2
a-4
b-2
a-5
a-6
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 19
a-1. Developer
1) Remove the DV cartridge.
2) Remove the screw, and remove the DV cover.
3) Remove old developer.
∗
Use a metal scale or a minus screwdriver for easy operation.
4) Supply new developer.
a-2. DV blade
1) Remove the DV cartridge.
2) Remove the DV blade.
∗
When attaching the DV blade, attach to the attachment refer-
ence shown in the figure below.
ence shown in the figure below.
a-3. DV side seal F
a-4. DV side seal R
1) Remove the DV cartridge.
2) Remove the DV side seal F and the DV side seal R.
∗
When attaching the SV side seals F and R, attach them to the
attachment reference shown in the figure below.
attachment reference shown in the figure below.
Reference
Reference
(Step)
(Step)
0.5mm
0mm
0.5mm
0mm
Reference
Reference
0.5mm
0mm
0.5mm
0mm
Reference
Reference
0.5mm
0mm
0.5mm
0mm
MX-M350/M450 N/U MAINTENANCE AND DETAILS OF EACH SECTION 7 - 20
a-5. Toner density sensor
a-6. Humidity sensor
1) Remove the DV cartridge.
2) Remove the bottom cover.
3) Remove the bottom cover.
4) Remove the screw and the connector, and remove the humid-
ity sensor.
a-7. Toner cartridge
1) Open the left door and the front door.
2) Release the lock and remove the toner cartridge.
a-8. Toner motor
1) Remove the toner cartridge.
2) Remove the screw, and remove the rear cabinet.
2) Remove the connector and the screw, and remove the PCU
PWB unit.
3) Remove the connector and the screw, and remove the toner
motor unit.
4) Remove the coupling and the spring from the toner motor.
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