Sharp AR-C260 (serv.man10) Service Manual ▷ View online
AR-C260/C260M DESCRIPTIONS OF EACH SECTION 7 - 17
• LED unit composition
c. OPC drum section operations
The OPC drum surface is charged negatively by the main charger, and
LED light of images are radiated onto the OPC drum surface by the
LED (writing) unit to form electrostatic latent images.
LED light of images are radiated onto the OPC drum surface by the
LED (writing) unit to form electrostatic latent images.
1) The OPC drum surface is negatively charged by the main charger.
The screen grid is attached to the main charger unit. The OPC
drum is charged at a voltage nearly same as the voltage applied to
the screen grid.
drum is charged at a voltage nearly same as the voltage applied to
the screen grid.
2) LED light is radiated onto the OPC drum surface by the LED (writ-
ing) unit to form electrostatic latent images.
When LED light is radiated onto the OPC drum CGL, positive and
negative charges are generated. Positive charges generated in the
CGL are attracted and moved by negative charges of the OPC
drum, and negative charges by positive charges of the aluminum
layer of the OPC drum. Therefore, on the OPC drum surface and in
the aluminum layer, positive and negative charges are neutralized,
reducing the OPC drum surface potential.
negative charges are generated. Positive charges generated in the
CGL are attracted and moved by negative charges of the OPC
drum, and negative charges by positive charges of the aluminum
layer of the OPC drum. Therefore, on the OPC drum surface and in
the aluminum layer, positive and negative charges are neutralized,
reducing the OPC drum surface potential.
Electric charges remain in the areas where LED light is not radi-
ated onto the OPC drum.
ated onto the OPC drum.
As a result, electrostatic latent images are formed on the OPC
drum surface.
drum surface.
Charges are disposed in direct proportion to the amount of light
received.
received.
3) Clean and remove residual toner from the OPC drum with the
cleaning blade after transfer operations.
Removed residual toner is transported to the waste toner section
of the toner cartridge by the waste toner transport screw.
of the toner cartridge by the waste toner transport screw.
4) The whole surface of the OPC drum is discharged.
By radiating discharge lamp light onto the discharge lens, light is
radiated through the discharge lens to the OPC drum surface.
radiated through the discharge lens to the OPC drum surface.
When discharge lamp light is radiated onto the OPC drum CGL,
positive and negative charges are generated.
positive and negative charges are generated.
Positive charges generated in the CGL are attracted and moved by
negative charges of the OPC drum, and negative charges by posi-
tive charges of the aluminum layer of the OPC drum. Therefore, on
the OPC drum surface and in the aluminum layer, positive and
negative charges are neutralized, reducing the OPC drum surface
potential, preparing the drum surface for the new copy cycle.
negative charges of the OPC drum, and negative charges by posi-
tive charges of the aluminum layer of the OPC drum. Therefore, on
the OPC drum surface and in the aluminum layer, positive and
negative charges are neutralized, reducing the OPC drum surface
potential, preparing the drum surface for the new copy cycle.
Item
Content
Print width
314mm
Total number of dots
7424 dot
Resolution
600dpi
LED
composition
composition
Number of LED chips
58 chip
Number of dots
128 dot
Lens
Selfoc lens
Aluminum
layer
OPC drum
CTL
CGL
High voltage unit
Main corona unit
Screen grid
OPC drum
LED light
Aluminum
layer
layer
OPC drum
CGL
CTL
OPC drum
Lens
CTL
CGL
Aluminum
layer
layer
Aluminum
layer
layer
CTL
CGL
AR-C260/C260M DESCRIPTIONS OF EACH SECTION 7 - 18
d. Developing section (composed of four units of YMCK)
operations
Electrostatic latent images generated on the OPC drum by the LED
(writing) units are converted into visible images by toner.
(writing) units are converted into visible images by toner.
Toner in the developing unit is agitated by the mixing roller.
By mixing operation, toner is negatively charged due to mechanical
friction.
friction.
The developing bias voltage (negative) is applied to the developing
roller.
roller.
The diflerence for the voltage potential between the toner and DV roller
surface attracts the toner to the DV roller.
surface attracts the toner to the DV roller.
In the areas of the OPC drum, when the charge was detected, the volt-
age potential difference is greater than the DV roller. Therefore the
toner is attracted from the DV roller to the drum.
age potential difference is greater than the DV roller. Therefore the
toner is attracted from the DV roller to the drum.
In the unexposed areas of the drum, the potential on the DV roller cre-
ated by the bias voltage and therefore the toner to not attracted to
those areas of the drum.
ated by the bias voltage and therefore the toner to not attracted to
those areas of the drum.
Negatively charged toner is attracted and attached to the exposed
area on the OPC drum surface where the negative potential was
reduced by LED exposure.
area on the OPC drum surface where the negative potential was
reduced by LED exposure.
On the other hand, in the areas on the OPC drum where exposure was
not made, the positive potential is higher than the developing bias volt-
age, repelling toner.
not made, the positive potential is higher than the developing bias volt-
age, repelling toner.
<1> Remaining toner quantity detection
Rotation of the detection lever connected to the mixing roller is
sensed by the sensor (TES) to detect the remaining toner quantity.
sensed by the sensor (TES) to detect the remaining toner quantity.
<2> Waste toner collection
Waste toner collected by the drum cleaning blade is transported to
the waste toner box of the toner cartridge by the toner transport
spring in the drum unit.
the waste toner box of the toner cartridge by the toner transport
spring in the drum unit.
Aluminum
layer
layer
CGL
CTL
OPC drum
Drive
Own weight
Drive
Own weight
OPC drum
AR-C260/C260M DESCRIPTIONS OF EACH SECTION 7 - 19
B. Disassembly/assembly/maintenance
(1) Process section maintenance target parts
✕
: Check (Clean, replace, or adjust as necessary.)
❍
: Clean
▲
: Replace
∆
: Adjust
✩
: Lubricate
❏
: Shift position
Note: When replacing the OPC drum, execute SIM 25-1 for 2 minutes. (This simulation is executed in order to avoid generation of stripes on a half-
tone print image.)
tone print image.)
Unit name
No.
Part name
When
calling
50K
100K
150K
200K
250K
300K
350K
400K
Remark
Drum module
1
Drum (Black/color)
▲
▲
▲
▲
▲
▲
▲
▲
2
Charging unit
▲
▲
▲
▲
▲
▲
▲
▲
3
Cleaner blade
▲
▲
▲
▲
▲
▲
▲
▲
4
Toner reception seal
▲
▲
▲
▲
▲
▲
▲
▲
5
Drum cartridge
▲
▲
▲
▲
▲
▲
▲
▲
When replacing the unit
Developing section
(integrated with
toner cartridge)
(integrated with
toner cartridge)
6
Toner cartridge
User replacement at every toner empty
LED
7
LED lens
❍
❍
❍
❍
❍
❍
❍
❍
❍
5
2
2
4
4
3
3
1
1
5
2
2
4
4
3
3
1
1
5
2
2
4
4
3
3
1
1
7
6
AR-C260/C260M DESCRIPTIONS OF EACH SECTION 7 - 20
(2) Maintenance parts/major parts replacement
a. Drum unit removal
1) Open the front cabinet and left cabinet.
2) Turn the fixing screw in the arrow direction A to release it, and
remove the drum unit in the arrow direction B.
Note: Be sure to open the left cabinet before releasing the fixing
screw.
If the fixing screw is released before opening the left cabinet,
the lock cannot be released.
If the fixing screw is released before opening the left cabinet,
the lock cannot be released.
In that case, push the drum unit to the rear frame side and
release the lock, and remove the drum unit.
release the lock, and remove the drum unit.
b. Drum removal
1) Remove the drum unit.
2) Remove the retaining clip from the drum shaft (A).
3) Slide the drum shaft in the arrow direction B.
4) Remove the drum in the arrow direction C.
c. Charging unit
1) Remove the drum unit.
2) Remove the screw and remove the cover (A).
3) Remove the MC unit from the MC cleaning shaft.
4) Remove the charging unit (C).
∗
When assembling, attach the drum, then attach the charging unit.
(This is to prevent against dirt by starting powder applied to the
drum.)
(This is to prevent against dirt by starting powder applied to the
drum.)
d. Cleaner blade
1) Remove the drum unit.
2) Remove the charging unit.
3) Remove (A).
4) Remove the screw, and remove the cleaner blade.
e. Toner reception seal
1) Remove the drum unit.
2) Remove the drum.
3) Remove the screw, and remove the toner reception seal.
Note: Do not deform the seal.
A
B
ARC260(13_3_A03)
A
C
B
A
B
C
A
B
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