Toner is not attracted to the non-image areas on the drum because
of the developing bias. Thus, if the developing bias were to fail, the
residual charge would attract the toner so that a background would
appear in the non-image areas of the copy.
Step-5: Transfer
The visible image on the drum surface is transferred onto the copy
paper by applying a negative charge from the transfer corona to the
back of the copy paper.
As the transfer effect is 70 to 80%, 20 to 30% of the image remains
on the drum (residual toner) even after the transfer.
Step-6: Cleaning
Toner remaining on the drum is collected by the cleaner blade and
stored in the toner collecting container.
Step-7: Discharge
(same as Step-1)
Step-8:
The transferred image is fixed permanently on the copy paper by the
action of the fuser unit through a combination of heat and pressure,
the toner is fused into the copy paper.
4. Transition of OPC drum surface potential
5. OPC drum membrane decrease correction
The sensitivity falls due to the OPC drum membrane decrease. To
correct this, the copy lamp light quantity is adjusted, preventing
against deterioration in copy quantity.
1. Setting procedure
For setting, use Sim 26-11.
(1) Set value: 1
∼
5
Set value
Content
0
OPC drum membrane decrease correction is not
performed.
1
For every 3,000 copies, the copy lamp voltage is
increased by 0.33 V (0.66 V in 200 V series).
2
For every 3,000 copies, the copy lamp voltage is
increased by 0.66 V (1.32 V in 200 V series).
3
For every 3,000 copies, the copy lamp voltage is
increased by 0.99 V (1.98 V in 200 V series).
4
For every 3,000 copies, the copy lamp voltage is
increased by 1.32 V (2.64 V in 200 V series).
5
For every 3,000 copies, the copy lamp voltage is
increased by 1.65 V (3.30 V in 200 V series).
Change in the copy lamp voltage when the set value is "1" (in 100 V
series).
-600
-500
-400
-300
-200
-100
0
Drum surface potential
Developing bias
Charge
Exposure
Developing
Transfer
Discharge
Charge
Time
-700
-150V
Residual potential (-80~100V)
Toner attract
potential
Non-image
area
Cleaning blabe
Residual toner
OPC drum
surface
potential
Charging Exposure
Development
Dark
area
Transfer Separation Cleaning
Developing bias
Light
area
Residual potential
DL
BL
-150V
-650V
Cleaner
OPC drum
Develop
CTL
CGL
CTL
CGL
The CTL layer of the OPC drum is worn down by use.
(New)
(After use)
SIM.46-01
CLV
3.0
0
6.0
9.0
12.0
0.33V UP
0.33V UP
0.33V UP
Drum
reqlacement
timing
Copy
volume
(K)
6 – 3
www.freeservicemanuals.info
1/11/16
Published in Heiloo, Holland.
